中文摘要：

表面土壤 / 沉积样品被收集从水级的变化地区(WLFZ ) ，栽培土地和森林从 Shenjia 分水岭在 50 个不同格子点登陆，在 2013 年 8 月的三个峡水库区域。为砷的空间分发，来源和生态的风险评价(作为) ，镉(Cd ) ，铬(Cr ) ，铜(Cu ) ，镍(Ni ) ，铅(Pb ) 和锌(Zn ) 在这研究被分析。结果证明除了 Ni 和 Cr，所有测试金属有类似的分发模式，与在学习区域的西南(WLFZ 和分水岭插头) 散布的高集中的区域。Ni 和 Cr，断然高度在高集中被相关并且介绍，首先在南方和学习区域的中间的地区被散布。所有金属的更低的集中区域一致地高举起的地区和森林土地向西被散布。因素分析(FA ) 和分析多重的线性回归(FA-MLR ) 显示出的因素专业 Cd 采购原料，这是化肥，交通采购原料，它一起说明了 87% Cd。同样， Zn 和 Cu 层次被工业、国内的来源，首先供应为中的 76% 个的财务作为， 75% Cu 和 67% Zn。Cd 污染的学习分水岭的表面土壤 / 沉积代表高生态的风险，而另外的金属代表低生态的风险。潜在的生态的风险索引(仙子) 分析显示它有一低(宽范围) 生态的风险并且一中等(小范围) 首先在学习分水岭的插头散布的生态的风险。化肥和交通是 Cd 污染的主要来源，它应该是仔细为水质量和生态的保存的目的控制的更多。

英文摘要：

Surface soil/sediment samples were collected from the Water-Level Fluctuation Zone（WLFZ）, cultivated land and forest land at 50 different grid points from Shenjia watershed, the Three Gorges Reservoir area in August 2013. The spatial distribution, sources and ecological risk assessment for Arsenic（As）, Cadmium（Cd）,Chromium（Cr）, Copper（Cu）, Nickel（Ni）, Lead（Pb）and Zinc（Zn） were analyzed in this study. The results showed all tested metals had similar distribution patterns except Ni and Cr, with areas of high concentrations distributed in the southwest（WLFZ and watershed outlet） of the study area. Ni and Cr,which were highly positively correlated and present in high concentrations, were primarily distributed in the south and middle zones of the study area. Lower concentration areas of all metals were uniformly distributed west of the high-elevation zones and forest land. Factor analysis（FA） and factor analysismultiple linear regression（FA-MLR） showed that the major sources of Cd were fertilizer and traffic sources,which together accounted for 87% of Cd. As, Zn and Cu levels were primarily supplied by industrial and domestic sources, accounting for 76% of As, 75% of Cu and 67% of Zn. Surface soils/sediments of the study watershed contaminated by Cd represent a high ecological risk, whereas other metals represent low ecological risks. The potential ecological risk index（PERI） analysis indicated that it had a low（widerange） ecological risk and a moderate（small-range）ecological risk primarily distributed in the outlet of the study watershed. Fertilizers and traffic are the primary sources of Cd pollution, which should be more closely controlled for the purposes of water quality and ecological conservation.