Nutrient Cycling And Balance Of Agri-Livestock Combining System In The Yanmenguan Ecological Animal Economic Area

Yanmenguan Ecological Animal Economic Area is an important area of livestock production in Shanxi Province. It is one of the important regions in Beijing Tianjin sandstorm source treatment project. The Cetian Dongyulin Reservoir in the area is important water supply sources for Beijing and Tianjin. With the development of livestock, its impact on the environment is more concerned by people. The studies of the animal industry nutrient flowing, cycling, and the balance is very rare. Therefore, This study will research the nutrient cycling, and the profits and losses of nutrient flow of the integrated system with dairy farming and planting corn farming in the area (For example Shanyin County). It will provide evidence for the comprehensive utilization and management of nutrient resources. And it is of great significance to reduce the environmental impact.At this stage, because of the breeding habits, the use of concentrated feed is limited. In the survey, only 59% of farmer use of concentrated feed, only 6% of precision feed are concentrated feed. Its impact for the nutrient input and output in the aquaculture production is less. The number of cows per hectare corn farmers is called as breeding density. Although the impacts on the nutrients input and output from breeding density are not significantly affected, but it is implant for the nutrient input in the planting subsystem.Study results show that feeding and fertilizer are the main nutrient input sources, milk and calf are the main output sources in the integrated system of nutrient cycling procession. The other nutrients no export flow into the environment in the production process through various channels. Nearly a decade, feed and fertilizer nutrients input have been on the increase, but the increase in output of nutrients are slow, large of nutrients surplus and enter the environment. In the dairy subsystem production process, 43.3%, 23.6%. 6.2% of the nutrients N, P, K are not taken away by circulating material (milk, calf and waste) and flow into the environment. In the dairy waste composting process for organic fertilizer, 36%, 5%, 71% of the manure nutrients N, P, K are not taken to farmland as organic fertilizer and flow into the environment. In the planting subsystem, 45.4%, 21.9% and 4.9% of the nutrients N, P, K are not taken away by corn and corn stalks and flow into the environment. These nutrients will be potential hazards for the environment.Therefore, based on the research which found that the problems and shortcomings, will propose appropriate measures to improve the nutrients resource management, reduce nutrients loss, and reduce the impact on the environment.