Temporal and spatial distribution of poultry excrements in every district and county of Chongqing

Poultry excrements are generally considered as the main non-point pollution source in the country.Hence,the annual amount of excretion has increasingly attracted people's attention.Based on the statistic information in the years 1995,1996 and 2000,2001 of every district and county of Chongqing,the paper estimated the amount of poultry excrements,analyzed and compared the distribution characteristics and changing tendency of excreta amount of poultry per year.It can be known from the analyzing results that in 1995,1996,2000 and 2001,the excreta amount of poultry urine is 74.5503 million tons,78.3156 million tons, 72.2384 million tons, and 74.2152 million tons, respectively.The weight of equated pig excrements,in the four years above mentioned,are 69.5484 million tons,74.1962 million tons,64.335 million tons,,67.480 2 million tons,respectively.The average contents of organic matter, N, P and K of the poultry excrements per year are 7.9445 million tons,0.4327 million tons,0.2336 million tons, and 0.4551 million tons，respectively.The equated pig excrement load and the amount of organic matter, N, P and K are greater in the outskirts,and the amount of poultry excrements,organic matter, N, P and K in it is greater in the Three-Gorge area. No distinct differences of the aspects above between before and after 1997.