Wang Yong-yan, Wen An-bang, Shi Zhong-lin, Yan Dong-chun, Zhu Bo, Tang Jia-liang
Huan Jing Ke Xue. 2016 Mar 15;37(3):935-41.
In order to analyze the spatial variation characteristics of grain diameter, nutrient elements and heavy metal pollution with deposition sediment in tributaries bay of the Three Gorges Reservoir, we selected 9 typical tributaries bay, 54 deposited sediment samples were collected from the riparian zone for analyzing grain diameter distribution, capacity, organic matter, nutrient elements of TN, TP and K, heavy metal elements of Cr, Cu, Ni, Pb, and Zn. The results indicated that particle size distribution from Wujiang River in Fuling to the Modao stream in Yunyang presented a trend of fluctuation, deposited sediment at 160-165 m elevation was coarser than that at 165-175 m elevation,volume percent of sand and clay presented a moderate variation at both altitudes, while silt had small variation. Independent sample t test showed that characteristics difference between the upper and lower sediments in riparian zone was not significant. The geo-accumulation index of heavy metal pollutants in the sediment from riparian zone of the Three Gorges Reservoir tributaries bay indicated that, only Zn element in Zhenxi River, Longdong River and Long River, Pb element in the Modao Stream belonged to non-moderate pollution levels, whereas there were no pollution of all other elements in tributaries.
为分析三峡水库支流回水区沉积泥沙中粒径、营养元素及重金属污染的空间变化特征，我们选取了9个典型支流回水区，从河岸带采集了54个沉积泥沙样本，用于分析粒径分布、容量、有机质、总氮（TN）、总磷（TP）和钾等营养元素以及铬（Cr）、铜（Cu）、镍（Ni）、铅（Pb）和锌（Zn）等重金属元素。结果表明，从涪陵的乌江到云阳的磨刀溪，粒径分布呈现波动趋势，海拔160 - 165米处的沉积泥沙比海拔165 - 175米处的更粗，两个海拔高度处砂和黏土的体积百分比变化适中，而粉砂变化较小。独立样本t检验表明，河岸带上、下沉积物的特征差异不显著。三峡水库支流回水区河岸带沉积物中重金属污染物的地累积指数表明，只有镇溪河、龙洞河和龙河的锌元素，磨刀溪的铅元素属于非中度污染水平，而支流中其他元素均未污染。
