基于氮磷养分平衡的畜禽粪污土地承载力研究——以FK县为例

Research on the Land Carrying Capacity of Livestock and Poultry Manure Based on Nitrogen-Phosphorus Nutrient Balance——A case study of FK County

为科学调整区域种植业和养殖业的规模与布局,促进种养结合循环发展。本文基于氮磷养分平衡法,以《畜禽粪污土地承载力测算技术指南》为计算依据,测算FK县及其各乡镇2020—2023年平均畜禽粪污土地承载力,并对其进行环境污染预警评估。结果表明,FK县基于氮养分的土地承载力为2880329头猪当量,磷养分为2015232头猪当量。当前养殖规模为1322075头猪当量,FK县畜禽养殖量尚未超载。但从各乡镇来看,乡镇D处于超载状态;FK县基于氮、磷养分的环境污染预警等级均为Ⅰ级,无污染风险。从各乡镇来看,乡镇D风险预警等级分别为Ⅲ级或Ⅳ级,污染较为严重。乡镇B、E、N、R、S均为Ⅱ级风险,稍有污染。

In order to scientifically adjust the scale and layout of plantation and aquaculture in the region,and to promote the cyclic development of the combination of plantation and aquaculture,this paper based on the nitrogen-phosphorus nutrient balance method,takes the“Technical Guidelines for Measuring Land Carrying Capacity of Livestock and Poultry Manure”as the calculation basis to measure the average land carrying capacity of livestock and poultry manure in 2020~2023 in FK County and its townships,and to evaluate the early warning of environ-mental pollution.The results show that:the land carrying capacity of FK County based on nitrogen nutrients is 2880329 pig equivalents,phosphorus nutrients is 2015232 pig equivalents,and the current scale of aquaculture is 1322075 pig equivalents,so the amount of livestock and poultry farming in FK County has not yet been over-loaded,but from the viewpoint of townships,Township D is in an overloaded state;the environmental pollution early warning level of FK County based on nitrogen and phosphorus nutrients is all Class I,and there is no pollu-tion risk.However,from the viewpoint of each township,the risk warning level of D is ClassⅢorⅣrespective-ly,and the pollution is more serious.Township B、E、N、Rand S are all of ClassⅡrisk and slightly polluted.