甘肃省牲畜粪便污染评价和牲畜养殖空间预测

通过计算分析, 对甘肃省2001-2010年间牲畜粪便对环境造成的影响和牲畜未来的发展空间做了评价。结果显示, 甘肃省牲畜粪便总量呈现不断增加的趋势, 不同地区的粪便排放量差异较大;全省牲畜粪便已经逼近每公顷耕地的承受限额, 部分市州耕地土壤已受到污染;牲畜粪便对水体的影响日益增大, 各市州影响不尽相同。牲畜粪便污染物对水体污染较大的是TN、TP, 而COD的影响很小;牲畜粪便预警分析表明, 牲畜粪便对全省环境总体影响不严重, 但各市区影响相差悬殊;对不同地区养殖空间的分析结果表明, 嘉峪关、威武等地牲畜养殖量已超载, 甘南、定西等地还有较大的发展空间。

Livestock feces pollution evaluation and grazing capacity prediction in Gansu province

The present study evaluated the environment impacts of livestock feces and estimated the quantity capacity of livestock development space in the future by calculating and analyzing data between 2001 and 2010 in Gansu Province. The gross of livestock feces gradually increased. The amounts of livestock discharge varied in different cities and the capacity of livestock feces in each hectare had reached the maximum. The worse part is that cultivated land soil had been polluted in some cities. The influence of livestock increased gradually and presented various effects in different cities. Compared with COD, TN and TP of livestock excrement and urine were main pollutants of the water body. The warning value analysis indicated that livestock feces pollution in Gansu was not serious although it was imbalanced in different area. The livestock had overloaded in some cities like Jiayuguan City, however, cities like Gannan and Dingxi have larger development space.