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三峡库区典型支流库湾消落带沉积泥沙特征及重金属评价
引用本文:王永艳,文安邦,史忠林,严冬春,朱波,唐家良. 三峡库区典型支流库湾消落带沉积泥沙特征及重金属评价[J]. 环境科学, 2016, 37(3): 935-941
作者姓名:王永艳  文安邦  史忠林  严冬春  朱波  唐家良
作者单位:中国科学院成都山地灾害与环境研究所, 山地表生过程与生态调控重点实验室, 成都 610041;中国科学院大学, 北京 100049;中国科学院成都山地灾害与环境研究所, 山地表生过程与生态调控重点实验室, 成都 610041;中国科学院成都山地灾害与环境研究所, 山地表生过程与生态调控重点实验室, 成都 610041;中国科学院成都山地灾害与环境研究所, 山地表生过程与生态调控重点实验室, 成都 610041;中国科学院成都山地灾害与环境研究所, 山地表生过程与生态调控重点实验室, 成都 610041;中国科学院成都山地灾害与环境研究所, 山地表生过程与生态调控重点实验室, 成都 610041
基金项目:国家自然科学基金重点项目(41430750);中国科学院西部行动计划项目(KZCX2-XB3-09)
摘    要:为了分析三峡库区支流消落带沉积泥沙的理化特征以及重金属污染的空间变化特征,选择9条典型一级支流,共采集54个消落带沉积泥沙样品,测定了粒径分布、容重、有机质(TOC)、总氮(TN)、总磷(TP)、钾(K)等养分元素含量特征以及运用地累积指数评价铬(Cr)、铜(Cu)、镍(Ni)、铅(Pb)、锌(Zn)等重金属.结果表明消落带沉积泥沙粒径分布在空间上(乌江-磨刀溪)中值粒径呈波动变化;支流消落带下部(160~165 m)沉积泥沙相比上部(165~175 m)偏粗,不同高程带砂粒和黏粒体积分数变化属于中等变异,粉粒属于弱变异.独立样本t检验表明消落带上部和下部之间沉积泥沙特征差异不显著.地累积指数评价表明支流消落带沉积泥沙只有Zn元素在珍溪河、龙洞河和龙河属于无-中的污染程度,Pb元素在磨刀溪属于无-中的污染程度,其他元素在所选支流消落带均为无污染.

关 键 词:支流库湾  沉积泥沙  理化性质  重金属  三峡库区
收稿时间:2015-08-12
修稿时间:2015-09-29

Characteristics of Deposited Sediment and Assessment of Heavy Metals in Typical Tributaries Bay Riparian Zone of the Three Gorges Reservoir
WANG Yong-yan,WEN An-bang,SHI Zhong-lin,YAN Dong-chun,ZHU Bo and TANG Jia-liang. Characteristics of Deposited Sediment and Assessment of Heavy Metals in Typical Tributaries Bay Riparian Zone of the Three Gorges Reservoir[J]. Chinese Journal of Environmental Science, 2016, 37(3): 935-941
Authors:WANG Yong-yan  WEN An-bang  SHI Zhong-lin  YAN Dong-chun  ZHU Bo  TANG Jia-liang
Affiliation:Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;University of Chinese Academy of Sciences, Beijing 100049, China;Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
Abstract: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.
Keywords:tributary bay  deposited sediment  physicochemical properties  heavy metal  the Three Gorges Reservoir
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