上海市郊蔬菜布局变化对环境质量及蔬菜产品中污染物含量的影响

EFFECTS OF CHANGING VEGETABLE DISTRIBUTION IN SHANGHAI SUBURBS ON ENVIRONMENTAL QUALITY AND VEGETABLE POLLUTION LEVEL

调查分析了上海市郊菜区布局变化对其水、土、气环境和蔬菜污染的影响。结果表明，土壤中重要污染元素含量下降了50％左右，“优良”和“安全”的菜田土壤上升了50％多；大气中氟化物等污染物含量也大大降低；但是水质、有机污染仍然明显。与布局调整前（以近郊菜区为主时期）相比，中远郊蔬菜中污染物含量也有显著降低。说明郊区蔬菜布局的调整有利于绿色食品蔬菜在郊区的发展。

The effects of changing vegetable distribution in Shanghai suburbs on water,soil and atmosphere environments and vegetable pollution were investigated. As shown in the paper,the contents of important pollutants in soil decreased by about 50% after changing vegetable distribution,meanwhile the excellent-grade and safe-grade soil of vegetable fields increased by over 50%. Although the organic pollution of irrigation water in medium outer suburbs was still serious,the contents of fluoride,SO2, NOx and TSP in atmosphere reduced obviously. The pollutant contents in vegetables from medium outer suburbs also decreased significantly as compared with those in vegetables from near suburbs. These indicate that the change of vegetable distribution in suburbs can benifit the development of green food vegetables in suburbs.