Recently, the Chinese academy of agricultural sciences team in collaboration with the university of Melbourne in regional scale crop production system reactive nitrogen loss assessment method has made new progress, based on biogeochemical cycle model is constructed and the intensity of reactive nitrogen space index system of crop production of reactive nitrogen loss evaluation methods, and to make an empirical analysis of the bohai rim region as an example, reactive nitrogen for regional scale agriculture scientific management and provide a scientific basis for policy making.

According to the introduction, crop production system is an important source of reactive nitrogen loss, and more than half of the nitrogen input to farmland is lost through ammonia volatilization, nitrogen leaching, denitrification and other ways, resulting in different environmental effects. However, on the regional scale, how to scientifically evaluate the reactive nitrogen loss has been a difficult problem for domestic and foreign research. The results show that shandong province contributes the most to the total reactive nitrogen loss in the bohai rim region, and Beijing's crop production system has the highest reactive nitrogen loss intensity. Ammonia volatilization and nitrogen leaching are the main loss routes. Among 29 crop production systems in this region, vegetable production system is the hot spot reactive nitrogen loss system. The method constructed in this study can be used to evaluate the reactive nitrogen loss intensity of different crop systems and paths at the regional scale, which is helpful to identify the hot spots, crop systems and main loss paths of reactive nitrogen emissions, and provide support for the scientific management of reactive nitrogen at the regional scale.

Time: 2020.08.28

Source: http://www.caas.cn/xwzx/kyjz/307193.html