Abstract: In order to explore the current situation of livestock and poultry breeding industry in Anhui Province, prevent and control agricultural non-point source pollution, strengthen the resource utilization of livestock and poultry manure, the nutrient balance model was used to measure the nitrogen and phosphorus nutrient supply of livestock and poultry manure and the nitrogen and phosphorus nutrient demand of crop manure in Anhui Province from 2017 to 2021, and the spatio-temporal difference characteristics of land carrying capacity of livestock and poultry breeding and environmental pollution risks in various cities in Anhui Province were analyzed. The results show that the supply of nitrogen and phosphorus nutrients from livestock and poultry manure in Anhui Province is mainly concentrated in Fuyang, Bengbu, Suzhou and Bozhou in the north, which accounts for about 54% of the total emissions in the province. The distribution of nitrogen and phosphorus nutrient demand of crop manure has the same pattern. As a whole, the livestock and poultry breeding industry in the province is not overloaded, and the land carrying capacity index is about 0.50. However, the breeding pressure in some regions is relatively large. For example, the land carrying capacity index of Anqing, Chizhou, Huangshan and Xuancheng is above 0.70, which has a high risk of environmental pollution. Therefore, each region should adjust the proportion of manure application and rationally plan livestock and poultry breeding areas according to its actual situations, timely control the total amount of livestock and poultry. breeding in areas with high environmental pollution risk, and promote the balanced development between farming and breeding.
Keywords: nutrient balance method; land bearing capacity; nitrogen; phosphorus; Anhui Province
合肥工业大学学报自科版