Estimation and spatial distribution of the potential load of three-yellow chicken feces in Meijiang Watershed in China

Meijiang watershed is chosen as study area in this paper, the quantity of Three-Yellow Chicken feces of each township in 2009 was estimated by using the excretive coefficient method, and the breeding farms distribution of Three-Yellow Chicken was extracted by using GIS spatial analysis method. And then Three-Yellow Chicken feces load of townships was calculated. The Results show that: (1) the output of livestock manure, BOD₅, COD_Cr and NH₃-N in Meijiang watershed in 2009 were 21.77×10⁴t, 1.95×10⁴t, 1.32×10⁴t and 2639t respectively. (2) The pig fecal equivalent in outskirts of a city was greater than that in outer suburbs. (3) Townships whose breeding quantity was greatest were not the townships whose pig fecal equivalent load was the heaviest.