Physiological mechanism for the reduction in soil water in poplar (Populus deltoides) plantations in Dongting Lake wetlands
作者：
Li, Youzhi;Qin, Hongyan;Xie, Yonghong* ;Wang, Wei;Chen, Xinsheng;...
期刊：
Wetlands Ecology and Management ,2014年22(1):25-33 ISSN：0923-4861
通讯作者：
Xie, Yonghong
作者机构：
[Li, Youzhi; Qin, Hongyan] Hunan Agr Univ, Coll Biosci & Technol, Changsha 410128, Hunan, Peoples R China.;[Chen, Xinsheng; Li, Youzhi; Wang, Wei; Xie, Yonghong] Chinese Acad Sci, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China.;[Li, Youzhi; Zhang, Canming] Hunan Acad Forestry, Changsha 410004, Hunan, Peoples R China.;[Chen, Xinsheng; Xie, Yonghong] Chinese Acad Sci, Inst Subtrop Agr, Dongting Lake Stn Wetland Ecosyst Res, Changsha 410125, Hunan, Peoples R China.
通讯机构：
[Xie, Yonghong] C;Chinese Acad Sci, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China.
关键词：
Soil water content;Photosynthetic rate;Stomatal conductance;Transpiration rate;Water-use efficiency
摘要：
The use of large-scale tree plantations has provoked increasing concern regarding the negative effects on local environments in different ecosystems. However, the physiological mechanism underlying the reduction in soil water by tree plantations in wetlands is not clear. The aims of this study were to investigate the effects of poplar (Populus deltoides) plantations on soil water content and to elucidate the underlying physiological mechanisms. To this end, we conducted a 1-year fixed-plot investigation of soil water content (SWC), plant photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), and water-use efficiency (WUE) of individual leaves of 11- and 5-year-old poplars and of reed (Triarrherca sacchariflora, a native herbaceous plant) in the Dongting Lake wetlands, China. SWC was highest in reed, intermediate in 11-year-old poplar, and lowest in 5-year-old poplar, suggesting that poplar plantations produce a lower soil water content in wetlands. From May to July, Pn was significantly higher in reed than in the two poplar stands, but did not differ between the different-aged poplars. As a whole, Gs and Tr were higher, but WUE was lower, in the poplar stands than in reed during the growing season, indicating that Gs and Tr are the key physiological mechanisms associated with the lower soil water in poplar stands. Relationships among Pn, Gs, and Tr showed positive correlations (P < 0.01) for each type of vegetation. These data suggest that poplar plantations may cause the transformation of wetlands into dry land due to a lower WUE leading to a massive water loss from soil. This, in turn, would have an influence on community composition and ecosystem function after establishment of the plantations.
语种：
英文
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洞庭湖滩地杨树种植对植物多样性的影响
作者：
李有志;张灿明;邹冬生
作者机构：
湖南省林业科学院 长沙410004;湖南农业大学生物科学技术学院 长沙4010128
会议名称：
第二届中国湖泊论坛
会议时间：
2012-12-04
会议地点：
长沙
会议论文集名称：
第二届中国湖泊论坛论文集
关键词：
杨树人工林;植物多样性;洞庭湖滩地
摘要：
近几十年来,洞庭湖湿地杨树的大面积栽种是否会引起生物多样性的变化引起了社会与科学界广泛的关注.本研究以5林龄与11林龄的杨树林为研究对象,以邻近的原生典型植被荻为对照,阐明了杨树人工林对植物多样性的影响.结果表明,杨树2000、杨树2006、荻三种植物群落物种数分别为20、24、7,且物种均以单科与单属种为主,科属分布较为分散.杨树人工林总体上有利于植物多样性Patrick指数、Margalef指数、Simpson指数与Shannon-Wiener指数的提高.此外,依照物种的生物学与生态学特性对物种多样性进行分类的研究表明,杨树人工林导致湿生植物所占的比例明显的降低,中性植物比例的明显升高以及旱生植物的出现,引起阳性植物比例的明显升高,中性植物比例的不明显变化,阴性植物比例的明显降低,致使一、两年生植物比例的明显降低,多年生比例的明显升高,导致藤本植物比例的降低,草本植物比例的升高.对物种重要值的分析表明,杨树人工林导致群落优势物种发生明显变化,致使优势植物由荻、水芹、辣蓼等典型湿地植物变成水芹、牛鞭草、桃叶蓼、狗牙根、白茅等湿生—中性—旱生植物混合类型.最后,研究认为杨树人工林是通过对光照、土壤水分等湿地生境因子的改变从而引起林下植物多样性的变化,是植物对环境改变的响应结果.
语种：
中文
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Plant distribution can be reflected by the different growth and morphological responses to water level and shade in two emergent macrophyte seedlings in the Sanjiang Plain
作者：
Li, Feng;Li, Youzhi;Qin, Hongyan;Xie, Yonghong*
期刊：
Aquatic Ecology ,2011年45(1):89-97 ISSN：1386-2588
通讯作者：
Xie, Yonghong
作者机构：
[Li, Youzhi; Li, Feng; Xie, Yonghong] Chinese Acad Sci, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China.;[Li, Youzhi; Li, Feng; Xie, Yonghong] Inst Subtrop Agr, Dongting Lake Stn Wetland Ecosyst Res, Changsha 410125, Hunan, Peoples R China.;[Qin, Hongyan] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Xie, Yonghong] C;Chinese Acad Sci, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China.
关键词：
Deyeuxia angustifolia;Phragmites australis;Biomass accumulation;Water level;Shade
摘要：
In the Sanjiang Plain (North East China), narrowleaf small reed (Deyeuxia angustifolia) usually distributes widely in typical meadow or marsh, while reed (Phragmites australis), the concomitant species, is distributed sparsely in the D. angustifolia communities or relative open sites. To date, the mechanisms responsible for their different distribution patterns are far from clear. Both water level and light are important factors determining plant distribution in wetland ecosystems and therefore, the aim of this paper was to identify the role of these two factors and their potential interaction on plant distribution in this plain. Growth responses and biomass allocation of the two macrophytes were investigated by growing them in three irradiances (300, 100, 20 μmol m-2 s-1) and two water levels (0 and 5 cm) under greenhouse conditions. Biomass accumulation, mean relative growth rate (RGR), height and mean relative elongation rate (RER) of both species significantly decreased with the reduction of light availability. Biomass accumulation, RGR, height and RER of P. australis were significantly inhibited by higher water level. However, water level had no effect on the growth of D. angustifolia. Stem mass fraction was higher at 0-cm water level in D. angustifolia, and was not affected by water level in P. australis. These data suggest that D. angustifolia has a higher adaptive ability to acclimate to flooding and shade stresses than does P. australis, which might be an important reason for their different distribution patterns. © 2010 Springer Science+Business Media B.V.
语种：
英文
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三江平原小叶章和芦苇幼苗生长对低光胁迫的响应
作者：
李有志;张灿明;谢永宏;黄继山;杨刚
期刊：
应用与环境生物学报 ,2009年15(1):53-58 ISSN：1006-687X
通讯作者：
Xie, Y.
作者机构：
[谢永宏; Gang Y.] Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;[张灿明] Hunan Academy of Forestry, Changsha 410004, China;[黄继山] College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, China;[李有志] Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China, Hunan Academy of Forestry, Changsha 410004, China, College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, China
通讯机构：
[Xie, Y.] I;Institute of Subtropical Agriculture, Chinese Academy of Sciences, China
关键词：
小叶章;芦苇;光照强度;幼苗生长;形态学;三江平原
摘要：
采用5种低光处理(100、200、400、600、1000 lx)研究了小叶章和芦苇幼苗成活和生长对低光胁迫的响应.两种湿地植物幼苗的成活率均随着光照强度的升高而显著增大,小叶章和芦苇幼苗全部成活的光照强度下限分别为400、1 000 lx.两种植物幼苗生长参数(根重、茎重、叶重、总生物量、绝对生长速率、相对生长速率、净同化速率)都随光照强度的升高显著增大,而叶生物量比和形态学参数(叶面积比、比叶面积)随光照强度的升高显著降低.可见,小叶章和芦苇幼苗生长明显受到光照的影响,幼苗可通过增大光合器官的投入适应低光环境.相对芦苇而言,小叶章幼苗在低光胁迫下形态可塑性大,小叶章更低的存活光强下限及更强的形态可塑性表明小叶章幼苗适应低光胁迫的能力大于芦苇,这可能是小叶章能成为三江平原典型草甸、湿草甸和沼泽群落的优势种,而芦苇只能成为伴生种的主要原因之一.图6表1参31
语种：
中文
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不同植被类型对土壤微生物量碳氮及土壤呼吸的影响
作者：
杨刚;何寻阳;王克林;黄继山;陈志辉;...
期刊：
土壤通报 ,2008年39(1):189-191 ISSN：0564-3945
作者机构：
[杨刚; 李有志] 中国科学院,亚热带农业生态研究所,湖南,长沙,410125;[杨刚; 李有志] 湖南农业大学,生物科学技术学院,湖南,长沙,410128;中国科学院,研,究生院,北京,100039;[何寻阳; 王克林; 陈志辉; 艾美荣] 中国科学院亚热带农业生态研究所;[黄继山] 湖南农业大学
关键词：
植被类型;微生物量碳;氮;土壤呼吸;代谢熵
摘要：
对四种植被类型下土壤微生物量碳、氮、土壤呼吸速率以及代谢熵的研究，结果表明，土壤微生物量碳、氮以及土壤呼吸在四种植被类型间差异显著，而土壤微生物代谢熵之间差异不明显。且不同植被演替阶段土壤微生物量碳、氮从初级阶段到次生林阶段逐步增大，从次生林到成熟林阶段明显减小；土壤呼吸随着植被的正向演替，呼吸速率逐渐增强；四种植被类型间土壤微生物代谢熵在次生林中最低，为0．44mgg~(-1) h~(-1)，万熟林地中最高，为1．01mgg~(-1) h~(-1),表明土壤微生物对土壤碳的利用效率次生林较高，成熟林地较低。
语种：
中文
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光照和温度对小叶章种子萌发及其幼苗生长的影响
作者：
李有志;黄继山;朱杰辉
期刊：
湖南农业大学学报(自然科学版) ,2007年33(2):187-190 ISSN：1007-1032
作者机构：
湖南农业大学,生物科学技术学院,湖南,长沙,410128;湖南农业大学,园艺园林学院,湖南,长沙,410128;[朱杰辉; 黄继山; 李有志] 湖南农业大学
关键词：
小叶章;萌芽率;幼苗生长速率;光照;温度
摘要：
采用2种光照和8种温度处理研究了光照和温度对小叶章种子萌发及其幼苗生长的影响.结果表明,除30℃外,其他温度处理光照和黑暗处理的种子萌芽率差异不显著,种子萌发表现为非光敏性.在10～35℃,小叶章种子都能萌发,但萌发适宜温度为20～30℃,最适温度为30℃,最大萌芽率为54%.高温度处理的种子一般比低温度处理的种子萌发早,如30℃处理的在第2天就开始萌发,而10℃处理的在第4天才开始萌发.在适宜的温度时光照能促进小叶章幼苗的生长,在25℃和30℃,光照处理的幼苗在第10天的生长高度和最大根长都大于黑暗处理.幼苗在不同温度下生长差异较大,其中20～30℃的最大根长无显著差异,但比其他处理的大,为小叶章幼苗生长的适宜温度.
语种：
中文
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Oxygen enhances the recovery of Potamogeton maackianus from prolonged exposure to very low irradiance
作者：
Li, Youzhi;Xie, Yonghong* ;Ren, Bo;Luo, Wenbo;Huang, Jishan
期刊：
Aquatic Botany ,2007年86(3):295-299 ISSN：0304-3770
通讯作者：
Xie, Yonghong
作者机构：
[Xie, Yonghong] Chinese Acad Sci, Inst Subtrop Agr, Changsha 410125, Peoples R China.;Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Peoples R China.;Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China.
通讯机构：
[Xie, Yonghong] C;Chinese Acad Sci, Inst Subtrop Agr, Changsha 410125, Peoples R China.
关键词：
Alcoholic fermentation;Anoxia;Decline;Dissolved oxygen;Potamogeton maackianus;Recovery
摘要：
Recovery ability in relation to carbohydrate content of Potamogeton maackianus growing in two dissolved oxygen concentrations (8 and 2 mg L-1) was investigated during 28 days exposure to very low irradiance (about 0.06 μmol m-2 s-1). Plant weight remained relatively constant (0.19 g dry wt plant-1) within the initial 21 days in the high oxygen treatment, but decreased to 0.14 g dry wt plant-1 at the end of the experiment. In low oxygen environments, plant weight was similar within the initial 14 days, but decreased to 0.08 g dry wt plant-1 at 21 day. During the experimental period, both soluble sugar and starch contents in shoots decreased with time. Compared to high oxygen treatment, plants in the low oxygen treatment depleted starch more quickly (25 versus 18 mg g-1 at 28 day) but remained a relatively high soluble sugar content (0.9 versus 1.8 mg g-1 at 28 day). After recovery in high light and high dissolved oxygen conditions for 1 week, plant growth rate, new branch number, stem elongation rate and leaf recruitment number were significantly higher in high oxygen than in the low oxygen treatments. These data suggest that the ability of the plant to recover from prolonged exposure to very low irradiance is related to the depletion level of carbohydrate stored in plant tissues, which is regulated by oxygen availability in the water. © 2006 Elsevier B.V. All rights reserved.
语种：
英文
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