Trends and Health Risks of Dissolved Heavy Metal Pollution in Global River and Lake Water from 1970 to 2017.
作者：
Li, Youzhi* ;Zhou, Qiaoqiao;Ren, Bo;Luo, Jia;Yuan, Jinrui;...
期刊：
Reviews of Environmental Contamination and Toxicology ,2020年251:1-24 ISSN：0179-5953
通讯作者：
Li, Youzhi
作者机构：
[Li, Youzhi; Yuan, Jinrui; Zhou, Qiaoqiao; Ren, Bo; Yao, Xin; Bian, Hualin; Ding, Xiaohui] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha, Peoples R China.;[Yuan, Jinrui; Ren, Bo; Yao, Xin; Bian, Hualin; Ding, Xiaohui] Hunan Agr Univ, Hunan Prov Key Lab Rural Ecosyst Hlth Dongting La, Changsha, Peoples R China.;[Luo, Jia] Hunan Acad Forestry, Changsha, Peoples R China.
通讯机构：
[Li, Youzhi] H;Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha, Peoples R China.
关键词：
Africa;Asia;Cd;Cr;Cu;Europe;Fe;Fertilizer and pesticide use;Global pollution;Health risk;Heavy metal regulation;Lake pollution;Mining and manufacturing;Mn;Ni;North America;Pb;Pollution history;Pollution-control measure;River pollution;Rock weathering;Source apportionment;South America;Waste discharge;Zn
摘要：
Heavy metal pollution in surface water is a global environmental problem. This study analyzed the trends, health risks, and sources of eight dissolved heavy metal species in river and lake water across five continents (Africa, Asia, Europe, North America, and South America; Oceania was excluded owing to a lack of data) for the period 1970-2017. We wanted to assess the effects of various implemented countermeasures to pollution and to determine those that could be adopted worldwide. Collectively, the water system showed increasing trends for Cd, Cr, Cu, Ni, Mn, and Fe and decreasing trends for Pb and Zn. The mean dissolved concentrations of most heavy metals were highest in Asia and lowest in Europe. Most heavy metals had low non-carcinogenic risks over this period. The cancer risks associated with Pb were lower than the hazardous level on all five continents over the five decades, whereas the cancer risks related to Cr exceeded the hazardous level in the 1970s, 2000s, and 2010s, and in Africa, Asia, and North America over the entire period. Mining and manufacturing were consistently found to be critical sources of metal pollution from 1970 to 2017. However, the heavy metal sources differed significantly by continent, with waste discharge and rock weathering dominant in Africa; mining and manufacturing, along with rock weathering, are dominant in Asia and South America; fertilizer and pesticide use, along with rock weathering, are dominant in North America; and mining and manufacturing, waste discharge, and rock weathering are dominant in Europe. Global trends in the metal loadings in water and in relevant pollution-control measures suggest that countermeasures in Europe have successfully controlled heavy metal pollution. The successful measures include implementing rigorous standards for metal emissions, limiting the metal concentrations in products, and rigorously treating metal-contaminated waste. Therefore, the measures implemented in Europe should be extended worldwide to treat heavy metal pollution in water.
语种：
英文
展开
Hyperspectral inversion of Suaeda salsa biomass under different types of human activity in Liaohe Estuary wetland in north-eastern China
作者：
Dou, Zhiguo;Li, Youzhi;Cui, Lijuan;Pan, Xu;Ma, Qiongfang;...
期刊：
MARINE AND FRESHWATER RESEARCH ,2020年71(4):482-492 ISSN：1323-1650
通讯作者：
Li, Wei
作者机构：
[Lei, Yinru; Cui, Lijuan; Pan, Xu; Zhao, Xinsheng; Li, Wei; Li, Jing; Dou, Zhiguo; Huang, Yilan] Chinese Acad Forestry, Inst Wetland Res, Xiangshan Rd, Beijing 100091, Peoples R China.;[Lei, Yinru; Cui, Lijuan; Pan, Xu; Zhao, Xinsheng; Li, Wei; Li, Jing; Dou, Zhiguo; Huang, Yilan] Beijing Key Lab Wetland Serv & Restorat, Xiangshan Rd, Beijing 100091, Peoples R China.;[Lei, Yinru; Cui, Lijuan; Pan, Xu; Zhao, Xinsheng; Li, Wei; Li, Jing; Dou, Zhiguo; Huang, Yilan] Beijing Hanshiqiao Natl Wetland, Ecosyst Res Stn, Muyan Rd, Beijing 101399, Peoples R China.;[Li, Youzhi] Hunan Agr Univ, Coll Biosci & Biotechnol, Nongda Rd, Changsha 410000, Hunan, Peoples R China.;[Ma, Qiongfang] Jilin Prov Acad Forestry Sci, Linhe St, Changchun 130000, Jilin, Peoples R China.
通讯机构：
[Li, Wei] C;[Li, Wei] B;Chinese Acad Forestry, Inst Wetland Res, Xiangshan Rd, Beijing 100091, Peoples R China.;Beijing Key Lab Wetland Serv & Restorat, Xiangshan Rd, Beijing 100091, Peoples R China.;Beijing Hanshiqiao Natl Wetland, Ecosyst Res Stn, Muyan Rd, Beijing 101399, Peoples R China.
关键词：
biomass;coastal wetland;human activity;least squares method;regression analysis;spectral reflectance;spectrometry;vegetation index;China;Liaohe Estuary;Liaoning;Suaeda salsa
摘要：
Human activities alter the growth of coastal wetland vegetation. In the present study, we used a spectrometer and hyperspectral data to determine and compare the biomass of Suaeda salsa in a coastal wetland under protective and destructive activities. Using typical discriminants, the hyperspectral data of Suaeda salsa were distinguished under the influence of two kinds of human activity, and the accuracy of the inversion model of biomass was established following improved differentiation of the data under the influence of human activities. The original spectral reflectance and vegetation index were selected, and the biomass-inversion model was established by linear regression and partial least-squares regression. The model established by partial least-squares regression had a good precision (R2 > 0.85, RMSE% < 5.6%). Hyperspectral technology can accurately show plant biomass and the indirect effects of interference by human activities of different intensity on coastal wetlands. The accuracy of the models can be improved by distinguishing the vegetation patterns under the influence of different types of human activity, and then constructing the biomass models. This study provides technical support for the use of quantitative remote sensing-based methods to monitor the fragile ecology of coastal wetlands under the influence of human activities. © 2020 CSIRO.
语种：
英文
展开
Morphological responses of two plant species from different elevations in the Dongting Lake wetlands, China, to variation in water levels
作者：
Li, Youzhi;Bian, Hualin;Ren, Bo;Xie, Yonghong* ;Ding, Xiaohui;...
期刊：
Nordic Journal of Botany ,2019年37(1):e01987- ISSN：0107-055X
通讯作者：
Xie, Yonghong
作者机构：
[Li, Youzhi; Zhou, Qiaoqiao; Ren, Bo; Yao, Xin; Bian, Hualin; Ding, Xiaohui] Hunan Agr Univ, Coll Bioscience & Biotechnol, Hunan Prov Key Lab Rural Ecosystem Hlth Dongting, Changsha, Peoples R China.;[Li, Youzhi; Xie, Yonghong] Chinese Acad Sci, Key Lab Agro ecol Processes Subtrop Region, CN-410125 Changsha, Peoples R China.;[Li, Youzhi; Yao, Xin] Inst Subtrop Agr, Dongting Lake Stn Wetland Ecosystem Res, Changsha, Peoples R China.;[Li, Youzhi; Zhou, Qiaoqiao; Ren, Bo; Yao, Xin; Bian, Hualin; Ding, Xiaohui] Hunan Agr Univ, Coll Biosci & Biotechnol, Dongting Lake Area, Hunan Prov Key Lab Rural Ecosyst Hlth, Changsha, Hunan, Peoples R China.;[Li, Youzhi; Xie, Yonghong] Chinese Acad Sci, Key Lab Agroecol Proc Subtrop Reg, CN-410125 Changsha, Hunan, Peoples R China.
通讯机构：
[Xie, Yonghong] C;Chinese Acad Sci, Key Lab Agroecol Proc Subtrop Reg, CN-410125 Changsha, Hunan, Peoples R China.
关键词：
Imperata cylindrical;Carex brevicuspis;flooding;drought;water tolerance;water sensitivity
摘要：
The vegetation of wetlands show strong zonation patterns, but the mechanisms determining these patterns are not fully understood. In the present study, growth and morphological responses to a water level gradient (–20 cm (i.e. water level 20 cm below soil surface), –10 cm, 0 cm, 10 cm, 20 cm) were compared between a higher elevation plant (Imperata cylindrica) and a lower elevation plant (Carex brevicuspis) in the Dongting Lake wetlands of China. For both species, the aboveground, belowground, and total biomass were greater at –10 cm than at any other water level. However, when the water level increased from –10 cm to 0 cm, there was a greater decrease in the biomass of I. cylindrica than in that of C. brevicuspis. Plant height, tiller number, leaf length, leaf width and leaf area showed greater variation along the water level gradient in I. cylindrica than in C. brevicuspis. Generally, with increasing water level, root length, rhizome number, and adventitious root biomass and number all decreased in I. cylindrica. However, in C. brevicuspis, neither the rhizome number nor the primary adventitious root biomass differed significantly among the five water levels. These results indicate that I. cylindrica have a lower tolerance for flooding and higher water sensitivity than C. brevicuspis and these differences may explain why I. cylindrica is found at relatively higher elevations that are not prone to flooding, while C. brevicuspis is found at comparatively lower elevations in the Dongting Lake wetlands. © 2018 The Authors
语种：
英文
展开
桉树凋落物对土壤微生物群落的影响:基于控制实验研究
作者：
陈法霖;张凯;向丹;吴爱平;李有志;...
期刊：
土壤学报 ,2019年56(2):432-442 ISSN：0564-3929
通讯作者：
Zheng, H.
作者机构：
[吴爱平; 邹冬生; 李有志] Hunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake Area, College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, 410128, China;[郑华] State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;[张凯] College of Grassland and Environment Sciences, Xinjiang Agricultural University, Urumqi, 830052, China;[向丹] College of Resources and Environment, Qingdao Agricultural University, Qingdao，Shandong266109, China;[陈法霖] Hunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake Area, College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, 410128, China, State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
通讯机构：
[Zheng, H.] S;State Key Laboratory of Urban and Regional Ecology, China
关键词：
桉树;天然次生林;凋落物;土壤微生物
摘要：
全面认识桉树种植对土壤微生物群落结构和功能的影响及机制,对于阐明单一物种对生态系统服务功能的影响具有重要意义。通过室内小盆模拟控制试验,采用随机区组设计,以土壤碳、氮含量有显著差异的3种天然次生林土壤为对象,以不添加凋落物的处理和添加天然次生林混合凋落物的处理为对照,研究桉树凋落物对土壤微生物群落结构及功能的影响。结果表明:(1)与天然次生林的混合凋落物相比,桉树凋落物具有较高的碳含量和较低的氮含量,其碳氮比也较高;(2)添加桉树凋落物的土壤中细菌、真菌、放线菌以及磷脂脂肪酸的总丰度显著高于不添加凋落物的土壤,但是显著低于添加天然次生林混合凋落物的土壤,并且不同凋落物处理下土壤微生物群落的磷脂脂肪酸组成存在显著差异;(3)不同凋落物处理下土壤微生物群落的碳代谢方式差异显著,添加桉树凋落物的土壤微生物群落的碳代谢功能优于未添加凋落物的处理,但是显著低于天然次生林混合凋落物处理的土壤,包括:碳代谢的活性和多样性。综上所述,与天然次生林本身的凋落物相比,桉树凋落物影响下的土壤微生物群落的生物量、多样性和代谢活性均较低,表明桉树凋落物为土壤微生物群落提供生境和食物的能力较弱。
语种：
中文
展开
洞庭湖不同水位梯度川三蕊柳和短尖薹草土壤有机碳垂直分布特征
作者：
边华林;杨广军;牛艳东;邓嘉俊;李有志;...
期刊：
生态与农村环境学报 ,2019年35(8):1051-1057 ISSN：1673-4831
通讯作者：
Niu, Y.-D.
作者机构：
[边华林; 邓嘉俊; 李有志; 丁小慧; 姚欣; 周巧巧] College of Bioscience and Technology, Hunan Agricultural University, Changsha, 410128, China;[杨广军] Yueyang Research Institute of Forestry Science, Yueyang, 414000, China;[牛艳东] Hunan Academy of Forestry, Changsha, 410004, China
通讯机构：
Hunan Academy of Forestry, Changsha, China
关键词：
洞庭湖;川三蕊柳;短尖薹草;有机碳;腐殖质
摘要：
以洞庭湖湿地3种水位梯度(-60、-40和-20 cm,即水位在土壤表层60、40和20 cm以下)的川三蕊柳(Salix triandroides)和短尖薹草(Carex brevicuspis)为研究对象,揭示0~ 20、>20 ~ 40、>40 ~ 60、>60 ~ 80 cm土壤有机碳及腐殖质碳(胡敏酸碳、富里酸碳、胡敏素碳)含量的垂直分布特征。结果表明,在3种水位下,川三蕊柳和短尖薹草群落土壤有机碳和腐殖质碳含量均以0~ 20 cm土壤较高。川三蕊柳0~ 20 cm土壤有机碳含量以高水位区较高,而>20~ 80 cm土壤以中水位区较高;短尖薹草4层土壤有机碳含量均以中水位区较高。对土壤富里酸碳含量而言,川三蕊柳和短尖薹草群落在3种水位之间无显著差异。对土壤胡敏酸含量而言,川三蕊柳群落0 ~ 20 cm土壤以高水位区较高,>20~ 60 cm土壤在3种水位之间无显著差异,而>60 ~ 80 cm土壤以高水位区较低;短尖薹草群落0~ 40 cm土壤以中水位区较高,>40~ 60 cm土壤在3种水位之间无显著差异,而>60~ 80 cm土壤以高水位区较低。对胡敏素含量而言,川三蕊柳群落0~ 20 cm土壤以高水位区较高,>20 ~ 80 cm土壤以高水位区较低;短尖薹草4层土壤胡敏素碳含量均以中水位区较高。与短尖薹草群落相比,川三蕊柳群落能提高低水位区0 ~ 80 cm和高水位区0~ 20 cm土壤有机碳及腐殖质碳含量,但降低了中水位区0~ 80 cm和高水位区>20 ~ 60 cm土壤有机碳及腐殖质碳含量。可见,湿地土壤有机碳含量受植被类型和水位的综合影响,在洞庭湖湿地应选取高水位洲滩恢复川三蕊柳群落,以提高湿地土壤有机碳含量。
语种：
中文
展开
Bioaccumulation in Miscanthus sacchariflorus grown on cadmium-contaminated sediments: a comparative study between submerged and non-submerged environments
作者：
Yao, Xin;Yang, Nan;Li, Youzhi* ;Bian, Hualin;Ding, Xiaohui;...
期刊：
International Journal of Phytoremediation ,2019年21(3):240-245 ISSN：1522-6514
通讯作者：
Li, Youzhi
作者机构：
[Li, Youzhi; Zhou, Qiaoqiao; Yao, Xin; Bian, Hualin; Ding, Xiaohui] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.;[Yang, Nan] Hunan Cooperat Ctr Water Resources Res & Dev, Changsha, Hunan, Peoples R China.;[Li, Youzhi; Zhou, Qiaoqiao; Yao, Xin; Bian, Hualin; Ding, Xiaohui] Hunan Agr Univ, Hunan Prov Key Lab Rural Ecosyst Hlth Dongting La, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Li, Youzhi] H;Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.;Hunan Agr Univ, Hunan Prov Key Lab Rural Ecosyst Hlth Dongting La, Changsha 410128, Hunan, Peoples R China.
关键词：
cadmium;heavy metal;bioremediation;Poaceae;soil pollutant;Biodegradation, Environmental;Cadmium;Metals, Heavy;Poaceae;Soil Pollutants
摘要：
Bioaccumulation of heavy metals in aquatic plants is significantly affected by hydrological regime and therefore the accumulation and translocation of cadmium in five organs—panicle, leaf, stem, root, and bud—of an emergent plant (Miscanthus sacchariflorus) were compared between the submerged environment and non-submerged environment. In the submerged condition, the cadmium concentration was higher in the panicle and leaf than in the stem, root, and bud. Cadmium concentration in the root exhibited a positive regression with cadmium concentration in the sediment. However, cadmium concentration in the panicle, leaf, stem, and bud exhibited no significant regression with cadmium concentration in the sediment. In the non-submerged environment, the cadmium concentration was higher in the below-ground organs than in the aboveground organs. The mean bioaccumulation coefficient in the 24 investigated plots in the submerged environment was higher than that in the 20 and 40 mg kg −1 cadmium treatments in the non-submerged environment. The mean translocation factor in the submerged environment was nine times higher than that in non-submerged environment. These results indicate that submergence enhanced cadmium bioaccumulation in the aboveground organs and that this plant can be used to remove heavy metals from polluted rivers and lakes. © 2019, © 2019 Taylor & Francis Group, LLC.
语种：
英文
展开
Survival of completely submerged Salix triandroides cuttings is associated with non-structural carbohydrate metabolism
作者：
Ding, Xiaohui;Luo, Jia;Li, Youzhi* ;Ren, Bo;Bian, Hualin;...
期刊：
Journal of Freshwater Ecology ,2019年34(1):395-404 ISSN：0270-5060
通讯作者：
Li, Youzhi
作者机构：
[Li, Youzhi; Zhou, Qiaoqiao; Ren, Bo; Yao, Xin; Bian, Hualin; Ding, Xiaohui] Hunan Agr Univ, Hunan Prov Key Lab Rural Ecosyst Hlth Dongting La, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.;[Luo, Jia] Hunan Acad Forestry, Changsha, Hunan, Peoples R China.
通讯机构：
[Li, Youzhi] H;Hunan Agr Univ, Hunan Prov Key Lab Rural Ecosyst Hlth Dongting La, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.
关键词：
biochemical composition;carbohydrate;experimental study;growth response;macrophyte;metabolism;physiological response;starch;submerged vegetation;sugar;survival;water level;Salix
摘要：
The growth, survival, and non-structural carbohydrate metabolism in Salix triandroides cuttings, cultivated under no flooding, incomplete submergence, or complete submergence conditions (0, 25, and 50 cm of water above the soil surface, respectively), were measured after 50, 80, 110, and 140 days. Both submergence conditions decreased the biomass of the leaf, stem, and root, plant height, root length, and root number. As the duration of the treatments increased, these growth parameters gradually increased for the control and incompletely submerged conditions, but remained relatively constant for the completely submerged condition. The survival ratio was 100% across the experimental period for plants under the control and incompletely submerged conditions; however for plants under the completely submerged condition, it was 100% after 50 and 80 days but decreased to 91.7 and 33.3% after 110 and 140 days, respectively. Compared with the plants under control and incomplete submergence conditions, the completely submerged plants had significantly lower concentrations of soluble sugars and starch. As the concentration of soluble sugars in the completely submerged plants fell to 19.2%, and that of starch to 23.5% of that in the control plants, their survival ratio decreased to 33.3%. The results indicated that the survival of the S. triandroides cuttings grown in complete submergence conditions was associated with non-structural carbohydrate metabolism. © 2019, © 2019 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
语种：
英文
展开
Heavy metal bioaccumulation by Miscanthus sacchariflorus and its potential for removing metals from the Dongting Lake wetlands, China
作者：
Yao, Xin;Niu, Yandong;Li, Youzhi* ;Zou, Dongsheng;Ding, Xiaohui;...
期刊：
Environmental Science and Pollution Research ,2018年25(20):20003-20011 ISSN：0944-1344
通讯作者：
Li, Youzhi
作者机构：
[Li, Youzhi; Yao, Xin; Bian, Hualin; Ding, Xiaohui; Zou, Dongsheng] Hunan Agr Univ, Coll Biosci & Biotechnol, Hunan Prov Key Lab Rural Ecosyst Hlth Dongting La, Changsha 410128, Hunan, Peoples R China.;[Niu, Yandong] Hunan Acad Forestry, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Li, Youzhi] H;Hunan Agr Univ, Coll Biosci & Biotechnol, Hunan Prov Key Lab Rural Ecosyst Hlth Dongting La, Changsha 410128, Hunan, Peoples R China.
关键词：
Cadmium;Copper;Manganese;Lead;Zinc;Wetland phytoremediation
摘要：
Bioaccumulation of five heavy metals (Cd, Cu, Mn, Pb, and Zn) in six plant organs (panicle, leaf, stem, root, rhizome, and bud) of the emergent and perennial plant species, Miscanthus sacchariflorus, were investigated to estimate the plant’s potential for accumulating heavy metals in the wetlands of Dongting Lake. We found the highest Cd concentrations in the panicles and leaves; while the highest Cu and Mn were observed in the roots, the highest Pb in the panicles, and the highest Zn in the panicles and buds. In contrast, the lowest Cd concentrations were detected in the stem, roots, and buds; the lowest Cu concentrations in the leaves and stems; the lowest Mn concentrations in the panicles, rhizomes, and buds; the lowest Pb concentrations in the stems; and the lowest Zn concentrations in the leaves, stems, and rhizomes. Mean Cu concentration in the plant showed a positive regression coefficient with plot elevation, soil organic matter content, and soil Cu concentration, whereas it showed a negative regression coefficient with soil moisture and electrolyte leakage. Mean Mn concentration showed positive and negative regression coefficients with soil organic matter and soil moisture, respectively. Mean Pb concentration exhibited positive regression coefficient with plot elevation and soil total P concentration, and Zn concentration showed a positive regression coefficient with soil available P and total P concentrations. However, there was no significant regression coefficient between mean Cd concentration in the plant and the investigated environmental parameters. Stems and roots were the main organs involved in heavy metal accumulation from the environment. The mean quantities of heavy metals accumulated in the plant tissues were 2.2mg Cd, 86.7mg Cu, 290.3mg Mn, 15.9mg Pb, and 307mg Zn per square meter. In the Dongting Lake wetlands, 0.7 × 103kg Cd, 22.9 × 103kg Cu, 77.5 × 103kg Mn, 3.1 × 103kg Pb, and 95.9 × 103kg Zn per year were accumulated by aboveground organs and removed from the lake through harvesting for paper manufacture. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
语种：
英文
展开
Decomposition Processes in Coastal Wetlands: The Importance of Suaeda salsa Community for Soil Cellulose Decomposition
作者：
Ping, Yunmei;Cui, Lijuan;Pan, Xu* ;Li, Wei;Li, Youzhi;...
期刊：
POLISH JOURNAL OF ECOLOGY ,2018年66(3):217-226 ISSN：1505-2249
通讯作者：
Pan, Xu
作者机构：
[Li, Youzhi; Ping, Yunmei; Cui, Lijuan; Pan, Xu; Kang, Xiaoming; Li, Wei] Chinese Acad Forestry, Inst Wetland Res, Beijing, Peoples R China.;[Ping, Yunmei; Cui, Lijuan; Pan, Xu; Kang, Xiaoming; Li, Wei] Beijing Key Lab Wetland Serv & Restorat, Beijing, Peoples R China.;[Li, Youzhi] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha, Hunan, Peoples R China.;[Song, Tianyu] State Forestry Adm, Survey Planning & Design Inst, Beijing, Peoples R China.;[He, Ping] Liaoning Normal Univ, Dalian, Liaoning, Peoples R China.
通讯机构：
[Pan, Xu] C;[Pan, Xu] B;Chinese Acad Forestry, Inst Wetland Res, Beijing, Peoples R China.;Beijing Key Lab Wetland Serv & Restorat, Beijing, Peoples R China.
关键词：
coastal wetlands;cotton-strip assay;nutrient cycling;salinity;vegetation degradation
摘要：
Coastal wetlands are ecologically important all over the world, and they are relatively unstable with dramatic changes in aboveground vegetation. However, it is still unclear how the aboveground vegetation changes will influence the functioning of coastal wetland ecosystems, especially the decomposition processes. Here, we carried out a cotton strip experiment to examine the effects of Suaeda salsa community on the soil properties and the associated cellulose decomposition rates in the coastal wetlands of Liao River delta (NE China). Our results showed that S. salsa community significantly affected the contents of soil C, N, P, base cations, organic matter and the soil electrical conductivity (EC), and such effects might vary among different types or densities of aboveground vegetation. The soil cellulose decomposition rate (in terms of cotton strip tensile strength loss, CTSL) was slowed down when aboveground S. salsa communities are experiencing degradation or have been totally replaced by Phragmites australis communities. Moreover, there were positive partial correlations between soil N and CTSL, and between soil EC and CTSL, but a negative partial correlation between soil C and CTSL. Our results emphasized the importance of S. salsa community in determining the soil cellulose decomposition rate in this coastal region. The results suggest that vegetation degradation in coastal wetlands might lead to various changes in soil properties and hence affect other aspects of ecosystem functioning and services, especially nutrient cycling.
语种：
英文
展开
引进种桉树人工林取代天然次生林对土壤微生物群落结构和功能的影响
作者：
陈法霖;张凯;王芸;吴爱平;李有志;...
期刊：
生态学报 ,2018年38(22):8070-8079 ISSN：1000-0933
通讯作者：
Zheng, H.
作者机构：
[陈法霖] 湖南农业大学生物科学技术学院洞庭湖区农村生态系统健康湖南省重点实验室,长沙410128;[陈法霖] 中国科学院生态环境研究中心城市与区域生态国家重点实验室,北京100085;新疆农业大学草业与环境科学学院,乌鲁木齐,830052;山东省水土保持与环境保育研究所,临沂大学资源与环境学院,临沂276005;[邹冬生; 李有志; 吴爱平] 湖南农业大学生物科学技术学院洞庭湖区农村生态系统健康湖南省重点实验室,长沙,410128
关键词：
桉树人工林;天然次生林;土壤微生物群落
摘要：
由于桉树对原生生态系统具有潜在的破坏性影响,随着桉树人工林面积的不断扩大,桉树种植对森林生态系统的影响越来越受到社会的关注。围绕引进种桉树造林对土壤微生物群落的影响,应用成对试验设计,采用磷脂脂肪酸(PLFA)和BIOLOG微平板培养等技术手段探讨土壤微生物群落结构和功能如何响应桉树人工林取代天然次生林这一变化,主要结果为:桉树人工林取代天然次生林导致:(1)土壤微生物生物量减少,包括:生物量碳、氮和磷脂脂肪酸丰度显著下降;(2)反映土壤微生物群落生理胁迫状况的指标:饱和直链脂肪酸/单不饱和脂肪酸、革兰氏阳性菌/革兰氏阴性菌、支链异构/反异构脂肪酸以及cy19:0/18:1ω7c的比值显著增加;(3)土壤微生物群落碳代谢强度和多样性显著降低;(4)桉树人工林取代天然次生林导致土壤微生物群落结构变化和功能退化的主要环境因素包括:植物物种丰富度和覆盖度的降低以及土壤资源(碳、氮和水分)可获得性的降低。综上所述,引进种桉树人工林取代天然次生林降低了植物物种丰富度和覆盖度以及土壤资源的可获得性,进而显著增强了土壤微生物群落生理胁迫、显著降低了土壤微生物群落功能。
语种：
中文
展开
Effect of water cadmium concentration and water level on the growth performance of Salix triandroides cuttings
作者：
Yao, Xin;Ma, Fengfeng;Li, Youzhi* ;Ding, Xiaohui;Zou, Dongsheng;...
期刊：
Environmental Science and Pollution Research ,2018年25(8):8002-8011 ISSN：0944-1344
通讯作者：
Li, Youzhi
作者机构：
[Li, Youzhi; Deng, Jiajun; Yao, Xin; Bian, Hualin; Ding, Xiaohui; Zou, Dongsheng] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.;[Ma, Fengfeng; Niu, Yandong] Hunan Acad Forestry, Changsha 410004, Hunan, Peoples R China.;[Niu, Yandong] Hunan Dongting Lake Wetland Ecosyst Res Stn, Yueyang 414000, Peoples R China.
通讯机构：
[Li, Youzhi] H;Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.
关键词：
Salix triandroides;Cadmium concentration;Flooding;Phytoextraction;Photosynthesis;Bioaccumulation coefficient;Translocation factor
摘要：
The growth performance of Salix triandroides cuttings at three water cadmium (Cd) concentrations (0, 20, and 40mgL−1) and three water levels (− 40cm, water level 40cm below the soil surface; 0cm, water level even with the soil surface; and 40cm, water level 40cm above soil surface) was investigated to evaluate its potential in phytoextraction strategies. Compared to cuttings in the − 40 or 0cm water levels, cuttings in the 40cm water level showed significantly lower biomass, height, and adventitious root length and significantly fewer leaves and adventitious roots. However, these growth and morphological parameters were not different among the three water Cd concentrations. Water level decreased stomatal conduction and transpiration rate but showed no significant effects on chlorophyll concentration or photosynthetic rate. Chlorophyll concentration and stomatal conductance were higher at 40mgL−1 Cd treatment than at 0 or 20mgL−1 Cd treatment; yet, photosynthetic rate and transpiration rate were not different. Cd concentration in the leaves and stems increased as the water level increased, but the highest Cd concentration in the roots occurred in the 0cm water level. As water Cd concentration increased, Cd concentration in the leaves, stems, and roots increased in all three water levels, except in stems in the − 40cm water level. Under Cd stress, cuttings in the − 40 or 0cm water levels were characterized by a higher bioaccumulation coefficient, but a lower translocation factor, than those in the 40cm water level. However, the bioaccumulation coefficient increased with increasing water Cd concentration in all three water levels, as did the translocation factor in the 40cm water level. The tolerance index for the cuttings was the same among all water levels and water Cd concentrations. The results clearly indicated that the low water level increased plant growth and Cd accumulation in underground parts, while the high water level decreased plant growth but increased Cd accumulation in aboveground parts. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
语种：
英文
展开
Trade-off between leaf chlorophyll and betacyanins in Suaeda salsa in the Liaohe estuary wetland in northeast China
作者：
Li, Youzhi;Cui, Lijuan* ;Yao, Xin;Ding, Xiaohui;Pan, Xu;...
期刊：
植物生态学报(英文版) ,2018年11(4):569-575 ISSN：1752-9921
通讯作者：
Cui, Lijuan
作者机构：
[Li, Youzhi; Zhang, Manyin; Cui, Lijuan; Pan, Xu; Kang, Xiaoming; Li, Wei] Chinese Acad Forestry, Inst Wetland Res, Xiangshan Rd, Beijing 100091, Peoples R China.;[Li, Youzhi; Yao, Xin; Ding, Xiaohui] Hunan Agr Univ, Coll Biosci & Biotechnol, Nongda Rd, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Cui, Lijuan] C;Chinese Acad Forestry, Inst Wetland Res, Xiangshan Rd, Beijing 100091, Peoples R China.
关键词：
Suaeda salsa;pigment composition;soil Na+ content;Liaohe estuary wetland
摘要：
Aims Pigment composition is an important functional trait that can be affected by environmental factors. The objective of this study was to investigate the effect of soil salinity on pigment composition in Suaeda salsa by comparing chlorophyll and betacyanin content in the Liaohe estuary wetland, a typical coastal wetland in northeast China. Methods We investigated the plant biomass, percentage of red leaves and pigment content (chlorophyll a, chlorophyll b and betacyanins) in S. salsa in intertidal and supratidal zones of the upper, middle and lower reaches of the Liaohe estuary wetlands. The Na+ content of both the soil and plant was also measured. Full analysis of variance and multivariate analysis were used to compare differences in pigment content and Na+ content between the supratidal and intertidal zones. Important Findings Pigment composition was significantly affected by soil salinity. With increasing soil salinity, the percentage of red leaves was higher in the intertidal zone than in the supratidal zone. In all three reaches, plants had lower chlorophyll a content and higher betacyanin content in the intertidal zone than in the supratidal zone. Compared to chlorophyll a, chlorophyll b was less sensitive to soil salinity. There were no differences in chlorophyll b content between the intertidal and supratidal zones in the upper and lower reaches. Furthermore, pigment composition was associated with both the plant tissue and soil Na+ content. Compared to the supratidal zone, the intertidal zone had a higher Na+ content in plants. There was a negative relationship between plant chlorophyll content and soil Na+ content, but a positive relationship between betacyanin content and soil Na+ content. Overall, the results indicated that there might be a trade-off between leaf chlorophyll and betacyanin content in S. salsa to maintain its growth and survival in high salinity environments. © The Author(s) 2017. Published by Oxford University Press on behalf of the Institute of Botany, Chinese Academy of Sciences and the Botanical Society of China. All rights reserved.
语种：
英文
展开
Hydrologic and Edaphic Controls on Soil Carbon Emission in Dongting Lake Floodplain, China
作者：
Deng, Zhengmiao;Li, Youzhi;Xie, Yonghong* ;Peng, Changhui;Chen, Xinsheng;...
期刊：
Journal of Geophysical Research: Biogeosciences ,2018年123(9):3088-3097 ISSN：2169-8953
通讯作者：
Xie, Yonghong
作者机构：
[Chen, Xinsheng; Deng, Zhengmiao; Li, Feng; Pan, Baihan; Xie, Yonghong; Ren, Yijie] Chinese Acad Sci, Key Lab Agroecol Proc Subtrop Reg, Changsha, Hunan, Peoples R China.;[Chen, Xinsheng; Deng, Zhengmiao; Li, Feng; Pan, Baihan; Xie, Yonghong; Ren, Yijie] Chinese Acad Sci, Inst Subtrop Agr, Dongting Lake Stn Wetland Ecosyst Res, Changsha, Hunan, Peoples R China.;[Li, Youzhi] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha, Hunan, Peoples R China.;[Peng, Changhui] Univ Quebec Montreal, Inst Environm Sci, Dept Biol Sci, Montreal, PQ, Canada.;[Pan, Baihan; Ren, Yijie] Univ Chinese Acad Sci, Coll Resource & Environm, Beijing, Peoples R China.
通讯机构：
[Xie, Yonghong] C;Chinese Acad Sci, Key Lab Agroecol Proc Subtrop Reg, Changsha, Hunan, Peoples R China.;Chinese Acad Sci, Inst Subtrop Agr, Dongting Lake Stn Wetland Ecosyst Res, Changsha, Hunan, Peoples R China.
关键词：
soil carbon emission;environmental contorls;floodplain
摘要：
Wetlands play a critical role in mitigating carbon emission. However, little is known about soil carbon emission and their environmental controls from inland floodplain wetlands. This study aimed to determine the effects of hydrologic and edaphic controllers (water table depth [WTD], soil temperature [Ts], and soil water content [SWC]) on soil C emission in Dongting Lake wetland, China. One-year emissions were measured in Carex meadow and mudflat using static chambers during 2013 to 2014, including nonflooded season (NFs) and flooded season (Fs). The results showed that soil C emission in the Carex meadow and mudflat was 307.8 and 264.3 g C·m−2·year−1, respectively, and 50–66% of soil C were emitted during NFs. Compared with NFs, CO2 emission was significantly decreased by 57% but CH4 emission was significantly increased by 38 times during Fs in the Carex meadow. Stepwise regression combined with structural equation model analysis showed that CO2 and CH4 flux were mainly influenced by Ts during NFs, and they were controlled by water temperature (Tw) during Fs. During NFs, CO2 flux increased with increasing Ts and SWC but decreased significantly when SWC was over 66% and 52% in the Carex meadow and mudflat, respectively. CH4 flux showed an emission pulse at SWC and Ts of 65% and 17.2 °C, respectively. These results indicate that flooding significantly inhibited soil CO2 emission but stimulated CH4 emission. The continuous decrease of flooding days caused by anthropogenic disturbances may induce soil C loss in Dongting Lake wetlands.
语种：
英文
展开
Acclimation of Salix triandroides cuttings to incomplete submergence is reduced by low light
作者：
Ding, Xiaohui;Zou, Jianfeng;Li, Youzhi* ;Yao, Xin;Zou, Dongsheng;...
期刊：
Aquatic Ecology ,2017年51(2):321-330 ISSN：1386-2588
通讯作者：
Li, Youzhi
作者机构：
[Li, Youzhi; Ge, Zixuan; Deng, Jiajun; Yao, Xin; Bian, Hualin; Ding, Xiaohui; Zou, Dongsheng] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.;[Zou, Jianfeng] Hunan Agr Univ, Sci & Technol Innovat Platform, Changsha 410128, Hunan, Peoples R China.;[Zhang, Canming; Yang, Nan] Hunan Water Resources Res & Dev Ctr, Changsha 410013, Hunan, Peoples R China.;[Niu, Yandong] Hunan Acad Forestry, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Li, Youzhi] H;Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.
关键词：
Salix triandroides;Seasonal flooding;Morphological adaptation;Photosynthetic response;Anatomical adjustment;Dongting Lake wetlands
摘要：
A simulated flooding experiment was conducted to evaluate the effects of seasonal flooding on the plant Salix triandroides from the Dongting Lake wetlands in China. The morphology, photosynthetic activity, and anatomy of cuttings in three water conditions (−40 cm, water level 40 cm below soil surface; 0 cm, water level 0 cm at the soil surface; and 40 cm, water level 40 cm above soil surface) and two lights conditions (full sunlight and 10% sunlight) were measured. Plants had a higher survival ratio and biomass accumulation in full sunlight than in 10% sunlight when the water level was −40 and 0 cm, but there was no difference between these parameters in cuttings grown under the two light conditions in the 40 cm water treatment. In full sunlight, a lower survival ratio and reduced biomass were observed with increasing water level. The same trend was also seen for survival ratio in 10% sunlight. However, there was no difference in biomass among the three water levels in 10% sunlight, except for leaf weight. Branch height, leaf number, adventitious root length, and adventitious root number were different in the three water levels and two light conditions. In water levels of −40 and 0 cm, plants had lower chlorophyll contents in full sunlight than in 10% sunlight. In full sunlight, there was no difference in chlorophyll content between the water levels, while in 10% sunlight, lower chlorophyll content was observed in −40 cm than in 0 cm water. Photosynthetic rate, stomatal conductance, and transpiration rate decreased, but water-use efficiency increased in reduced light at all three water levels. Additionally, plants had higher porosity in 40 cm water than in −40 and 0 cm conditions. Based on the reduced plant growth in the 10% sunlight condition and decreased survival in the 40 cm water level, we conclude that low light significantly decreased plant acclimation to incomplete submergence and that high water levels induced dormancy in the cuttings. Therefore, the height of cuttings used for forestation or reforestation is an important consideration for mitigating the negative effects of seasonal flooding on the survival and growth of S. triandroides in Dongting Lake wetlands.
语种：
英文
展开
东洞庭湖莲藕种植区土壤重金属污染及其对莲藕重金属含量的影响
作者：
王婧文;姚欣;李有志;张灿明;牛艳东;...
期刊：
生态科学 ,2017年36(4):46-51 ISSN：1008-8873
作者机构：
湖南农业大学生物科学技术学院, 长沙, 410128;湖南省水资源研究和利用合作中心, 长沙, 410013;湖南省林业科学院, 长沙, 410004;[王婧文; 姚欣; 李有志; 葛紫萱] 湖南农业大学生物科学技术学院, 长沙, 410128;[张灿明; 杨楠] 湖南省水资源研究和利用合作中心, 长沙, 410013
关键词：
重金属污染;莲藕;生态风险;洞庭湖
摘要：
通过对东洞庭湖莲藕种植区的野外调查,揭示了土壤重金属污染的潜在生态风险及其对莲藕重金属含量的影响。土壤重金属镉(Cd)、铅(Pb)、铜(Cu)、锌(Zn)含量均高于洞庭湖背景值,以Cd污染最为严重,潜在生态风险指数高,属极重度生态风险级。莲藕干物质中重金属含量较高,其中Cd、Pb含量分别达到3.43 mg·kg~(-1)和6.84 mg·kg~(-1)。不同种植区域之间,莲藕重金属含量差异显著,以君山区挂口镇的莲藕重金属含量最高。莲藕重金属含量的高低与土壤重金属含量呈显著正相关关系(P<0.01)。可见,东洞庭湖莲藕种植区土壤重金属污染是导致莲藕重金属含量过高的直接原因,建议在污染较重的区域,减少莲藕种植,开展土壤重金属污染治理,引导莲藕产业健康发展。
语种：
中文
展开
基于辽河口湿地生态系统服务的等级补偿制度
作者：
李有志;崔丽娟;张曼胤;潘旭;李伟;...
期刊：
湿地科学与管理 ,2016年12(1):46-49 ISSN：1673-3290
作者机构：
[李有志] 中国林业科学研究院湿地研究所，北京 100091;湖南农业大学生物科学技术学院，长沙 410128;中国林业科学研究院湿地研究所,北京,100091;湖南农业大学生物科学技术学院,长沙,410128;[张曼胤; 康晓明; 崔丽娟; 李伟; 潘旭] 中国林业科学研究院湿地研究所
关键词：
生态补偿;生态服务;辽河口湿地
摘要：
作为生态补偿制度的核心问题,补偿标准存在诸多争议。随着生态系统服务的价值化与定量化,以生态服务量作为生态补偿标准逐渐成为一种共识。以辽河口湿地生态服务为研究对象,提出基于生态价值的等级补偿制度。根据环境特征,将辽河口湿地生态服务分为物质供给（石油供给、植物供给、水产品供给）、调节服务（水文调节、气候调节、污染物降解）、支持服务（生物多样性保护、促淤造陆）、文化服务（科学教育、休闲旅游）4大类。基于以上生态服务类型,采用专家打分法,分别赋予一定的权重（W）。对某一特定的生态服务而言,根据其年生态服务价值量变化率的高低,分别赋予对应的分值（S）,生态服务补偿指数（In）=W×S。根据总生态补偿指数的高低,依次给予6个等级,建立合理的等级生态补偿制度,为科学制定湿地保护政策提供理论依据。
语种：
中文
展开
洞庭湖区莲藕重金属污染特征
作者：
罗满;张灿明;李有志;杨楠;牛艳东;...
期刊：
农业资源与环境学报 ,2016年(06):554-559 ISSN：2095-6819
作者机构：
湖南农业大学生物科学技术学院;湖南省水资源研究和利用合作中心;湖南省林业科学院
关键词：
洞庭湖区;莲藕;重金属
摘要：
洞庭湖区土壤重金属污染引发了关于湿地产品中重金属可能超标的广泛担忧。本研究以洞庭湖区的湿地产品——莲藕为研究对象,通过对主要种植区域莲藕中重金属含量的野外调查,结合国家食品污染物限量标准,采用综合污染指数法,阐明莲藕中重金属镉（Cd）、铅（Pb）、铜（Cu）、锌（Zn）、锰（Mn）的污染特征。结果表明,洞庭湖区的莲藕重金属污染严重,以Cd、Pb超标明显,单项污染指数分别为5.70和8.35。根据莲藕中重金属综合污染指数的高低,产于岳阳楼区和沅江市的莲藕属于中度污染,而产于君山区、华容县、南县、大通湖区的莲藕属于重度污染。对莲藕重金属含量和各种植区的主成分分析表明,洞庭湖莲藕中度和重度污染区域呈现出明显的集群分布。莲藕种植区域的水土重金属污染和藕池破碎化是导致莲藕中重金属超标的两个主要原因,建议地方政府开展莲藕种植区域生境恢复,降低水土重金属污染,促进莲藕产业的健康发展。
语种：
中文
展开
洞庭湖湿地柳属木本植物与薹草属草本植物群落土壤与水环境特征
作者：
李有志;李锡泉;张灿明;马丰丰;徐佳娈
期刊：
湖泊科学 ,2015年27(5):887-894 ISSN：1003-5427
作者机构：
[李有志] 湖南农业大学生物科学技术学院，长沙410128;湖南省林业科学院，长沙410004;湖南省林业科学院,长沙,410004;[李有志] 湖南省林业科学院，长沙410004;[李锡泉; 张灿明; 马丰丰; 徐佳娈] 湖南省林业科学院
关键词：
木本植物;草本植物;洞庭湖湿地;土壤理化性质;水环境
摘要：
木本与草本是植物存在的两种主要生活型,生态功能差异明显,尤其在植物被周期性洪水淹没的湿地生态系统中.为此,以洞庭湖湿地二门闸、五门闸、藕池河口、白沙大桥4个研究点的原生柳属木本植被与薹草属草本植被为研究对象,通过对枯水期土壤理化性质与汛期水流速度、水环境的对比监测,揭示两者生态防护功能的差异.对土壤粒径组成而言,在二门闸与白沙大桥2个研究点,木本与草本植物群落土壤样本之间无显著差异;而在五门闸与藕池河,与草本植物相比,木本植物导致土壤上层(0~30cm)与下层(60~90cm)粉粒含量降低,砂粒含量增加,中层(30~60cm)黏粒与粉粒含量增加,砂粒含量降低.对土壤化学性质而言,木本植物总体上导致土壤有机质与全氮含量升高,而对全磷与全钾含量无显著影响.与草本植物相比,木本植物能显著减缓水流速度,提高水体氧化还原电位与溶解氧浓度,而对水温与pH值无明显影响.可见,洞庭湖湿地木本与草本植物生活型的差异,是导致二者土壤与水环境特征差别的主要原因,与草本植物相比,木本植物具有更强的生态防护功能.
语种：
中文
展开
辽河口湿地植物多样性及物种功能型空间分布格局
作者：
李有志;崔丽娟;潘旭;宁宇;李伟;...
期刊：
生物多样性 ,2015年23(4):471-478 ISSN：1005-0094
作者机构：
[李有志] 中国林业科学研究院湿地研究所,北京100091;[李有志] 湖南农业大学生物科学技术学院,长沙410128;[李有志] 湿地生态功能与恢复北京市重点实验室,北京100091;[孙宝娣; 李凯; 康晓明; 宁宇; 崔丽娟; 李伟; 于菁菁; 潘旭] 中国林业科学研究院湿地研究所
关键词：
滨海湿地;Shannon-Wiener指数;盐生植物;湿生植物
摘要：
辽河口湿地是我国典型的滨海湿地,在过去几十年受人为过度干扰,植被变化明显。本研究拟通过野外实地调查揭示辽河口湿地植物多样性及功能型的空间格局。结果表明,潮上带的物种丰富度和Shannon-Wiener指数均高于潮间带。与潮上带相比,潮间带的盐生植物与湿生植物比例较高,而中性植物、甜土植物、中生植物与旱生植物的比例较低。物种丰富度、Shannon-Wiener指数以及中性植物、甜土植物、中生植物、旱生植物的比例均随着与海岸线距离的增加而增加,盐生植物、湿生植物比例则与之相反。对所调查样地与植物物种的主成分分析(PCA)表明,潮上带主要为芦苇(Phragmites australis)、刺儿菜(Cirsium setosum)、山莴苣(Lagedium sibiricum)等中性和甜土植物,潮间带为盐地碱蓬(Suaeda salsa)、扁秆藨草(Scirpus planiculmis)、水烛(Typha angustifolia)等盐生植物。可见,盐度与水位是决定辽河口湿地植物多样性及物种功能型的关键生态因子。
语种：
中文
展开
洞庭湖湿地杨树人工林对土壤理化性质的影响
作者：
李有志;谢永宏;李峰;邹冬生
期刊：
农业现代化研究 ,2014年35(2):234-239 ISSN：1000-0275
作者机构：
湖南农业大学生物科学技术学院;中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室;[李有志] 湖南省林业科学院;中国科学院洞庭湖湿地生态系统观测研究站;[李峰; 谢永宏] 中国科学院亚热带农业生态研究所
关键词：
洞庭湖;杨树人工林;土壤理化特性;湿地;林龄;南荻
摘要：
近几十年来的杨树大面积种植引发了人们对洞庭湖湿地生态系统生态环境恶化的担忧。本研究以11龄与5龄杨树林为对象,以邻近的典型湿地植被南荻为对照,拟阐明杨树人工林对土壤理化性质的影响。结果表明,对土壤物理特性而言,杨树的种植加速了土壤水分的散失,对水分改变的趋势随林龄的增加而增大;杨树人工林改变了土壤粒径组成,致使粘粒与粉粒的降低、砂粒的增加,砂粒化趋势随林龄的增大而增强;对土壤化学特性而言,杨树人工林导致土壤中层(20-60 cm)电导率的降低,以及下层(60-100 cm)pH值的升高,对土壤全磷含量无明显影响,总体上降低了土壤全钾含量;引起土壤40-60 cm 全氮含量的降低,降低趋势随林龄的增加而增大。此外,两种杨树林对土壤全碳的影响不同,低林龄能降低土壤全碳含量,而高林龄有利于碳的增加。可见,大规模种植杨树导致土壤特性的重要改变必将对湿地生态系统产生深远的影响。
语种：
中文
展开
