我国农业生态系统营养循环链的断裂与重建

完整的营养循环是农业生态系统健康、可持续发展的重要保障。我国传统农业属于环境友好型生态农业。农业生态系统的营养循环结构完整，持续健康、繁荣。但是，随着工业化、城市化、市场经济的发展以及农业耕作方式的转变，农业生态系统营养循环的结构遭到严重破坏，导致一系列资源、环境、经济与社会问题。通过秸秆还田以及城市生活废弃物（排泄物、厨房垃圾等）向农业生态系统的返还，重建农业生态系统完整的营养循环，是我国农业生态系统持续健康发展的必由之路。

The Breaking and Reconstruction of Nutrient Recycling Chains in Agro-ecosystem in China

Completed nutrient recycling chain is crucial for the health and sustainable development of agro-ecosystem. Chinese traditional agriculture is the primary environmental-friendly agriculture or eco-agriculture. And its nutrient recycling chain was completed, healthy and flourishing continuously. But along with the transformation of massive production, market economy and the division of the urban and the rural, the nutrient recycling was interrupted and its balance was damaged heavily in agro-ecosystem and that caused serious environmental pollution and agro-ecosystem gradually barren. In this article, we discussed the causes which made agro-ecosystem decline, and the principles and practice pattern for reconstruction the nutrient recycling chain in China.