我国整个食物链氮素流动的现状.PDF

GLOBAL ISSUES IN NUTRIENT MANAGEMENT SCIENCE, TECHNOLOGY AND POLICY 4th International Nutrient Management Symposium Nitrogen and Phosphorus Flows in the Food Chain and their Contributions to Non-Point Pollution in China Ma Wenqi1 Ma Lin2,3 Hou Yong1 Gao Zhiling1 Zhang Fusuo2 1 Agricultural University of Hebei, China; 2 China Agricultural University, China; 3 Wageningen University, the Netherlands. (mawq@hebau.edu.cn). Outline of presentation Background Objects Materials and methods Results and discussion Conclusions Background • Nitrogen(N) and Phosphorus (P) have 3 properties –They are essential nutrients for life (plants, animals, and humans ) Positive effect –They are pollution factor (eutrophication of water bodies ) negative effect – P is a disappearing resource ( non-renewable resource) N and P management is related to food security, resource use and environmental protection. Background N and P flow in food chain is the key process for nutrient management • N and P effects is Food security greatly depended on Resource their flows and use efficiency in food chain • Food demand is the main driving force for their flows • It is very important to China Ma et al.,2010 Environment Fast change of society leads to increase of fertilizer demand and nutrient emission to environment Added: Animal food Increasing: Fruit Animal Lacked