福州菜区农业生态环境现状研究

参照有关标准及背景值分析了福州菜区四大水系、渠沟灌溉水、菜园土、城镇农用垃圾的硝酸盐和重金属元素的污染特征，结果表明，四大水系水质晋安河为轻污染，白马河和闽江下游福州水段为微污染，八一水库存为清洁，均可灌溉；渠沟灌溉水污染分布不均，东片的岳峰、鹤龄2个点Hg含量临界超标值，西片的长汀点Pb含量严重超标。菜园土除Cd外，其他重金属元素均有不同程度污染。城镇农用垃圾重金属含量虽符合国家标准，但Cr、Pb、Hg、As4种元素含量高于一般菜园土，这是造成福州菜区菜园土和蔬菜重金属污染的重要原因。

The agricultural eco-environment of vegetable growing areas in Fuzhou City

In reference of the relevant standard and background information,pollution statues of the four irrigation water sources,irrigation water in ditches and channels,soil in vegetable gardens and refuse compost in Fuzhou vegetable growing areas were evaluated based on analysis of their nitrate and heavy metal contents.The results showed that for the four main irrigation sources,Jin'an River is lightly contaminated,Baima River and the lower reaches of Minjiang River are slightly polluted, and Bayi Reservoir is clean.They can all be used as irrigation vater.But for the irrigation water in ditches and channels,the pollution condition is different,with content of Hg over the critical level at Yuefeng and Heling in eastern part of the region,and content of Pb being seriously over the critical level at Changting in western part of the region.For the vegetable soils,except for Cd,other heavy metal contents are all less or more over the critical level.The heavy metal contents in garbage are in accord with the national standard,but its contents of Cr,Pb,Hg,As are higher than those in vegetable soils,which may be the main reason causing the contamination of vegetable soils and heavy metal pollution to vegetables.