作者机构:
[尹雪斐; 刘玉玲; 伍德; 黄薪铭; 张朴心; 铁柏清] College of Resources and Environment, Hunan Agricultural University, Changsha;410128, China;Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha;Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha;[尹雪斐; 刘玉玲; 伍德; 黄薪铭; 张朴心; 铁柏清] 410128, China<&wdkj&>Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha
作者机构:
[杨宇; 郭婷婷; 刘孝利; 铁柏清] College of Resources and Environment, Hunan Agricultural University, Changsha;410128, China;Technology and Research Center for Irrigation Water Resource and uality Purification, Hunan Province, Changsha;[杨宇; 刘孝利; 铁柏清] 410128, China<&wdkj&>Technology and Research Center for Irrigation Water Resource and uality Purification, Hunan Province, Changsha;[杨宇; 郭婷婷; 刘孝利; 铁柏清] 410128, China
作者机构:
[滕伦; 张飞云; 马丽娜; Zhang F.] School of Public Management, Xinjiang Agricultural University, Xinjiang, Urumqi, 830052, China;[康建国] School of Resources and Environment, Hunan Agricultural University, Hunan, Changsha, 410128, China
通讯机构:
[Zhang, F.] S;School of Public Management, Xinjiang, China
关键词:
生态系统服务价值;时空演变;土地利用变化;新疆
摘要:
随着社会经济的发展,探究土地利用变化下生态系统服务价值(Ecosystem service value,ESV)时空演变对优化土地利用结构和区域持续发展有着重要意义。基于1980—2020年新疆土地利用数据,在ArcGI...展开更多 随着社会经济的发展,探究土地利用变化下生态系统服务价值(Ecosystem service value,ESV)时空演变对优化土地利用结构和区域持续发展有着重要意义。基于1980—2020年新疆土地利用数据,在ArcGIS和GeoDa支撑下,使用单位面积当量因子法、空间自相关等方法,分析新疆土地利用变化下ESV时空演变特征。结果表明:(1)1980—2020年新疆主要的土地利用类型是草地和未利用地,两者共占新疆总面积的91.00%。耕地和建设用地面积呈增加趋势,分别增长58.89%和166.79%;水域和林地面积减少量最多,分别减少29.95%和26.62%。(2)1980—2020年新疆ESV总体呈现“先增后减”的变化趋势,净减少1114.51×108元(6.68%)。从空间分布来看,新疆ESV高值区和较高值区主要分布在阿尔泰山、昆仑山、天山(简称“三山”)和伊犁河谷地区,中等价值区和较低价值区分布在绿洲地区,低价值区主要分布在盆地和沙漠地区。(3)1980—2015年新疆ESV变化很小,但2015—2020年北、中天山地区EVS变化显著。2015—2020年北、中天山地区高价值区减少75.29%,被中等价值区和较低值区取代;中等价值区和较低价值区分别增长13.64%和10.78%;低价值区有向中等价值区扩散趋势。(4)从ESV的空间自相关来看,局部相关性、热点分析呈现“西高东低”的空间分布特点。高-高集聚区、热点区分布在“三山”地区,低-低集聚区、冷点区分布在盆地和沙漠地区。水域和林地面积的下降是引起2015—2020年新疆生态系统服务总价值下降的主要原因之一。收起
作者机构:
[Xiaojing Li; Junjie Zhong; Hua Wang] College of Resources and Environment, Hunan Agricultural University, Changsha, China;[Mei Sun; Zunchang Luo; Chao Li; Xiaoping Xiao] Hunan Soil and Fertilizer Institute, Changsha, China;Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China;[Geng Sun] College of Resources and Environment, Hunan Agricultural University, Changsha, China<&wdkj&>Hunan Soil and Fertilizer Institute, Changsha, China;[San’an Nie] College of Resources and Environment, Hunan Agricultural University, Changsha, China<&wdkj&>Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
通讯机构:
[Hua Wang; San’an Nie] C;College of Resources and Environment, Hunan Agricultural University, Changsha, China<&wdkj&>College of Resources and Environment, Hunan Agricultural University, Changsha, China<&wdkj&>Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
关键词:
Anammox;Rice straw;Green manure;Scalindua;N loss
摘要:
The return of crop residue and green manure into agricultural soil is known to be important agricultural management strategies, yet how they affect the anammox process remains poorly characterized. A field experiment containing four treatments: chemical fertilizer (F), F plus rice straw (FS), FS plus green manure (FSM), FSM with integrated management (FSMM), was performed to examine the effects of incorporation of rice straw and green manure residues on anammox. The results showed that the anammox activities in FS and FSM treatments (0.65 and 0.80 nmol N g-1 soil h-1, respectively) were significantly lower than those in F and FSMM treatments (1.60 and 1.28 nmol N g-1 soil h-1, respectively). Anammox contributed 4.07%-4.95% of total N loss in soil incorporated with residues, lower than soil treated with chemical fertilizer only (9.13%), the remaining being due to denitrification. However, the abundance of the hzsB gene (the hydrazine synthase β-subunit gene) in FS and FSM treatments (1.13×10~6 and 1.18×10~6 copies g~(-1) soil) were significantly higher than soil using chemical fertilizer only (7.49×10~5 copies g~(-1) soil) while showed no significant difference with FSMM treatment (8.81×10~5 copies g~(-1) soil). Illumina sequencing indicated that Brocadia was the dominant anammox genus, following by Scalindua and Kuenenia. Anammox bacterial diversity was altered after 4-year incorporation of rice straw and green manure, as shown by α-diversity indices. We concluded that rice straw and green manure incorporated with mineral fertilizer reduce N removal from paddy soil in terms of anammox in spite of stimulating anammox bacterial growth.
摘要:
The scientific application of stabilized materials has been considered an effective method for the in situ remediation of Cd-contaminated soil.This study aimed to investigate the persistence of the effect of a combined amendment of limestone and sepiolite (LS) on soil Cd availability and accumulation in rice grown in a mildly Cd-contaminated paddy field (0.45 mg/kg of Cd) over three consecutive rice seasons.1125-4500 kg/ha of LS was applied to the soil before the first rice planting season and 562.5-2250 kg/ha of LS was supplemented before the third rice planting season.The application of LS (1125-4500 kg/ha) increased the soil pH by 0.44-1.09, 0.18-0.53, and 0.42-0.68 in the first, second, and third season, respectively, and decreased the soil acid-extractable Cd content by 18.2-36.4%, 17.7-33.5%, and 9.6-17.6%.LS application significantly decreased the Cd contents in the rice tissues.The application of 4500 kg/ha of LS decreased the Cd content in brown rice to below the National Food Limit Standard of 0.2 mg/kg (GB 2762-2017) in the three consecutive rice seasons.However, the effect of LS on the soil-rice system was significantly weakened in the third season.The supplementary application of 562.5-2250 kg/ha of LS further decreased the Cd content in brown rice by 26.1-56.5% and decreased the health risk index by 23.7-43.8%.Therefore, it was recommended to apply 4500 kg/ha of LS in the first season and to supplement 2250 kg/ha of LS in the third season to effectively guarantee the clean production of rice in three consecutive rice seasons.
作者机构:
[Zhou, Kun; Luo, Zirui; Yao, Bin; Chen, Xia; Zhou, Yaoyu; Li, Peipei] Hunan Agr Univ, Hunan Int Sci & Technol Cooperat Base Agr Typ Pol, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Yang, Zihui] Hunan Agr Univ, Coll Vet Med, Changsha 410128, Peoples R China.
通讯机构:
[Yaoyu Zhou] H;Hunan International Scientific and Technological Cooperation Base of Agricultural Typical Pollution Remediation and Wetland Protection, College of Resources and Environment, Hunan Agricultural University, Changsha, China
摘要:
Limited information is available on long-term effects of metal(loid)s pollution incidents. Here, we analyze the distribution characteristics and quantification of elements in the Southwest China Keda mining site, which is one of the most populated sites and enables human health and ecological risk assessments of elemental pollution. The results on modified degree of contamination indicated that the soil and sediment were highly contaminated near Dahu Lake. The health risk of children was almost 2.5 times that of adults in surface water, and 7.1 times in soil, respectively. Moreover, Tl and As were the main health risk contributors in surface water and soil, respectively, and As posed the highest ecological risk both in soil and sediment. These results indicated the potential impact of toxic metal(loid)s on the health of residents and environment. Hence, more scientific attention and proper management need to be paid to this environmental challenge in the future.