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农田生态系统的养分平衡是评价一个地区农业集约化程度和耕作水平的一个重要指标。农田营养物质的收支状况为科学地制定耕作制度和施肥措施,建立合理的农业结构提供可靠依据。研究它的目的在于通过人类对农田生态系统的自觉调控,获
The nutrient balance of farmland ecosystem is an important indicator to evaluate the degree of agricultural intensification and farming level in a region. The balance of farmland nutrients and nutrients provides a reliable basis for scientifically formulating farming systems and fertilization measures and establishing a reasonable agricultural structure. The purpose of studying it is to obtain through the conscious control of mankind the agroecosystem