文献类型：期刊文献

英文题名：Dam Effect on Soil Nutrients and Potentially Toxic Metals in a Reservoir Riparian Zone

作者：Zhang, Aiying[1,4] Cornwell, Will[2] Li, Zhaojia[1,3] Xiong, Gaoming[1] Yang, Dan[1,4] Xie, Zongqiang[1]

第一作者：Zhang, Aiying

通信作者：Xie, ZQ[1]

机构：[1]Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, 20 Nanxincun Xiangshan, Beijing 100093, Peoples R China;[2]Univ New South Wales, Sch Biol Earth & Environm Sci, Ecol & Evolut Res Ctr, Sydney, NSW 2052, Australia;[3]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Guangdong, Peoples R China;[4]Univ Chinese Acad Sci, Beijing 100049, Peoples R China

年份：2019

卷号：47

期号：1

外文期刊名：CLEAN-SOIL AIR WATER

收录：;Scopus(收录号：2-s2.0-85055515502);WOS:【SCI-EXPANDED(收录号:WOS:000455212400003)】；

基金：This work was supported by Chinese Academy of Science (KZCX2-XB3-09). The authors would like to thank all the stuff of Research Group of Forest Dynamics and Ecological Conversation of Institute of Botany, Chinese Academy of Science, for the help in field investigations and lab analyses, especially Dr. Changming Zhao and Qingye Yuan.

语种：英文

外文关键词：geoaccumulation index; nitrogen; potential ecological risk; potentially toxic metals; riparian zone

摘要：The unique hydrological regime of Three Gorges Dam (TGD) has brought enormous challenges to the riparian zone (RRZ), which plays an important role in regulating sediment and nutrient transport into the Yangtze River. The soil in a RRZ is one of the key factors that affect the water quality. After 4 years of winter-flooding, the concentration of soil nutrients and potentially toxic metals between the flooded reservoir RRZ and adjacent non-flooded upland (Upland) are examined. There are two main results: First, soil organic carbon and soil available potassium concentration were significantly lower in RRZ than in Upland. Soil total nitrogen (TN) concentration showed the same trend, but with no significance. Soil available phosphorus concentration is significantly higher in RRZ. Second, the concentrations of all the tested potentially toxic metals (Cd, Cr, Cu, Pb, Zn), their geoaccumulation index (I-geo) values and potential ecological risk index (E-i) values are significantly higher in RRZ than in Upland. Cd had the highest I-geo and E-i values in RRZ. The present results indicated that the flood-dry-flood cycle caused by TGD has changed the soil nutrient concentrations and increased the potentially toxic metal concentrations. There is a cross-contamination risk of the soil in RRZ, perhaps related to fertilization. As the last protective barrier for the Yangtze River, soil potentially toxic metals pollution control should deserve a considerable attention in the RRZ formed by TGD.