A Study on Distributions of Livestock Manure Nutrient Resources
畜禽废弃物养分资源分配方法研究

Livestock manure can result in a sustained and deteriorated trend of the rural ecological environment. However, it is also considered a renewable organic resource of enormous nutrient and energy, leading to considerable economic benefits if these renewable organic resources are properly handled and effectively utilized. Based on agricultural ecology, livestock and poultry raising knowledge, soil environmental science, environmental science, crop cultivation, and geographical information system (GIS) techniques, the authors systematically analyzed influencing factors in the reasonable transformation of livestock manure nutrient to farmland nutrient in the present work. By making use of livestock statistical data, the nutrient content of livestock manure was calculated, then the regional crop nutrient demand and nutrient supply amount of regional farmland were calculated. By using GIS and conducting an investigation of farmers, the authors determined the production of a specific goal on the basis of agricultural land for crop fertilizer grades and determined the need for the production demand for crop nutrients of a specific goal by means of crop cultivation in crop science knowledge. Based on this, we calculated the nutrient demand for agricultural land crops and regional crop nutrient demand in Daxing District, Beijing. In addition, and the authors fully examined spatial differences in land and derived the distribution of livestock manure nutrient by accounting for the distance weight among predicted points, habitation, scale raising, area weight and the modes for distributing livestock manure nutrient using spatial analysis modules involved in GIS. Results showed that the average, maximum, minimum and total amount livestock manure nitrogen nutrients in farmland was 541.896 kg, 2511.705 kg, 66.698 kg and 4595819.788 kg, respectively. Compared with commonly used spatial interpolation methods, the proposed method was found to give more reliable results associated with utilizing livestock manure nutrient. This could provide a meaningful basis for utilization of livestock manure without producing pollution and assisting in decision making in the breeding industry.