Trace metal flows and balances in small-scale vegetable production systems in periurban areas of China and Vietnam
The aim was to study sources, flows and balances of trace metals in intensive peri-urban vegetable farming systems in peri-urban areas of China and Vietnam. Animal manure was the major metal source at three study sites whereas waste water was the main metal contributor at one site. The inputs of Cu and Zn ranged between 0.4-4.0 and 2.1-5.4kg·ha<,-1>·yr<-1>, respectively, and the outputs between 0.1-0.3 and 0.5-1.4kg·ha<,- 1>·yr<,-1> leading to high surpluses. The present soil metal concentrations were well below the national standards, but current metal load could lead to soil accumulation reaching the maximum allowable soil concentrations within a few decades. Metal contaminated inputs, e. g. trough application of biosolids and wastewater, in intensive vegetable systems might be of concern related to crop quality and food safety (mainly Cd), soil quality (mainly Cu and Zn) as well as potential impact on surface and groundwater quality.
biosolids element balance soil quality trace metals vegetables waste-water
I. born Pham Quang Ha Biao Huang Nguyen Manh Khai Xuezheng Shi
Department of Soil Sciences, Swedish University of Agricultural Sciences (SLU), P. O. Box 7014, SE-7 National Institute for Soils and Fertilizers, Chem, Tu Liem, Hanoi, Vietnam Institute of Soil Sciences, Chinese Academy of Sciences, P. O. Box 821, 210008 Nanjing, China Department of Soil Sciences, Swedish University of gricultural Sciences (SLU), P. O. Box 7014, SE-75
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
48-50
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）