基于氮平衡的江华瑶族自治县畜禽养殖承载力及饱和度研究

采用物质平衡原理,将土壤中吸收与排放的氮元素进行量化,结合江华瑶族自治县畜禽养殖调查现状,开展江华瑶族自治县畜禽养殖承载力及饱和度研究。结果表明:2015年江华瑶族自治县畜禽养殖环境承载力以氮计算为2 164 782头(猪当量),32头/hm~2,污染风险指数为0.67,属于低污染风险,但各乡镇污染风险差异显著,分别在-54.67~3.44之间。

Supporting Capacity and Saturation of Livestock Breeding in Jianghua Yao Autonomous County Based on Nitrogen Balance

The principle of material balance was used to quantify the nitrogen absorbed and discharged in the soil, and the supporting capacity and saturation of Jianghua Yao Autonomous County in livestock breeding were investigated, combined with the related status of the county, in this study. The results showed that the environmental bearing capacity of the county in livestock breeding was 2164782 pigs (equivalent to nitrogen balance), at 32 pigs /(hm2), and the pollution risk index was 0.67 overall, at the low livestock pollution risk; but the pollution risk was significantly different in different towns of the county, at -54.67-3.44.