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Study on Regional Farmland Ecosystem Nutrient Balance Management

Abstract

农田生态系统养分循环和平衡是影响生产力和环境的重要过程。几十年来,中国的农作制度发生了重大变化,农业生产结构由以种植业为主逐步向种植与养殖并重转变,集约化生产水平不断提高,农业物质投入不断增加,化肥施用量的迅速增长使中国成为世界上化肥施用强度最高的国家之一。由于粮食安全保障的压力,化肥施用过量,施肥不平衡,肥料利用率低下,以及伴随规模化养殖业快速发展而来的有机废物急速增长,农田生态系统养分失衡引起的农业面源污染不断加剧。国内外关于农田生态系统养分平衡的研究偏重于现状评价,对养分平衡管理的应用性研究成果相对缺乏。研究区域农田生态系统养分平衡管理,能够衡量区域养分投入结果是否合理,使种植业和养殖业...Nutrient cycling and balance of farmland ecosystem is an important process affecting productivity and environment. For decades, great changes have taken place in China's farming system. Agricultural production structure which have consisted of mainly planting industry gradually shifts to paying equal attention to planting and breeding. At the same time, intensive production level continuously impr...学位:理学硕士院系专业:海洋与环境学院环境科学与工程系_环境管理学号:2262010115137

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