论文部分内容阅读
To assess the status of environmental bearing capacity of livestock and poultry manure in Nanjing City,the environmental pollution warning value and environmental bearing potential of livestock and poultry manure in various districts of Nanjing were calculated according to livestock and poultry manure discharge coefficient and manure content. The results showed that based on planting-breeding pattern,the livestock and poultry manure load in Nanjing City was14. 08 t/hm~2 pig manure equivalent; the warning values of environmental bearing capacity of livestock and poultry breeding calculated by nitrogen and phosphorus were 0. 23 and 0. 26,respectively,which were within the scope of environmental bearing capacity,with no threat to the environment. Under the premise of reasonable planing of livestock and poultry breeding and comprehensive utilization of manure,the environmental bearing potential of livestock and poultry breeding in Nanjing City were 5. 667 3 million( nitrogen) and 11. 109 1 million( phosphorus) pigs equivalent,and there were nearly one third of bearing space more than the existing total breeding quantity.
To assess the status of environmental bearing capacity of livestock and poultry manure in Nanjing City, the environmental pollution warning value and environmental bearing potential of livestock and poultry manure in various districts of Nanjing were calculated according to livestock and poultry manure discharge coefficient and manure content. The results showed that based on planting-breeding pattern, the livestock and poultry manure load in Nanjing City was14. 08 t / hm ~ 2 pig manure equivalent; the warning values of environmental bearing capacity of livestock and poultry breeding calculated by nitrogen and phosphorus were 0. 23 and 0. 26, respectively, which were within the scope of environmental bearing capacity, with no threat to the environment. Under the premise of reasonable planing of livestock and poultry breeding and integrated utilization of manure, the environmental bearing potential of livestock and poultry breeding in Nanjing City were 5. 667 3 million (nitrogen) and 11. 109 1 million (phosphorus) pigs equivalent, and there were nearly one third of bearing space more than the existing total breeding quantity.