黑土地保护视角下黑龙江省畜禽养殖环境效应分析OA北大核心CSTPCD

To make rational use of livestock and poultry manure resources,protect black land resources,optimize the distribution of agricultural and livestock production,and achieve green development of agriculture and animal husbandry in Heilongjiang Province,based on statistical data from 2011 to 2020 and the literature,this study calculated the situation of livestock and poultry manure discharge,analyzed the potential for livestock and poultry manure resource utilization,and determined the environmental carrying capacity of livestock and poultry breeding in the province.The results showed that the emissions of livestock and poultry feces,feces and urine nutrients,and chemical oxygen demand in Heilongjiang Province decreased slightly,by 3.68%,3.24%,and 5.82%,respectively,from 2011 to 2020.Although the replacement rate of chemical fertilizer by livestock and poultry manure declined slightly through the past decade,it remained above 35%.The replacement rate of chemical fertilizer has reached 41.89%in 2020,indicating a high potential for replacing chemical fertilizer with organic fertilizer.The energy potential of livestock and poultry manure in Heilongjiang Province has increased slightly,but its potential for replacing coal has declined and the substitution effect is insignificant.In 2020,the potential biogas yield from livestock and poultry manure was 4.674 billion m3,which is equivalent to 2.90%of the consumption of standard coal.This energy potential needs to be developed further and utilized.The cultivated land load of livestock and poultry manure,manure nitrogen,and manure phosphorus in Heilongjiang Province is not overloaded.At present,there is no breeding risk to the environment,and the space surplus of the livestock and poultry breeding environmental capacity is increasing.Currently,it is about two-thirds of the remaining capacity,approximately 130.061 3 million pigs equivalent calculated on the basis of nitrogen and 84.631 9 million pigs equivalent calculated on the basis of phosphorus,which indicates great breeding potential.There are obvious spatial distribution differences in the potentials of livestock and poultry manure discharge and resource utilization in the various regions of Heilongjiang Province.Harbin,Qiqihar,Suihua,Daqing,and Jiamusi have abundant livestock and poultry manure resources in livestock and poultry breeding cluster areas,and the potentials of livestock and poultry manure to replace fertilizer,provide energy,and for livestock and poultry breeding development are large.