辽宁省主要地区农田生态系统氮负荷的研究

利用辽宁省统计年鉴以及文献相关数据,通过农田养分收支平衡的计算,使用GIS工具,探讨辽宁省各地区农田生态系统的氮平衡变化.结果表明,辽宁省2007-2009年的平均总氮输入量是1.40E+ 09kg/a,平均总氮输出量是9.28E +08kg/a,平均总氮负荷是4.68E +08kg/a;其中,由使用化肥所产生的氮输入占总氮输入量的56.75％,有机肥氮占总氮输入量的18.73％.平均单位面积的氮输入量为358.94kg/(hm2·a),平均单位面积的氮输出量为240.37kg/(hm2·a),平均氮负荷为118.57kg/(hm2·a).通过对辽宁省14个地区农田生态系统的氮负荷研究,可以预测出不同地区的农田氮负荷对辽河流域水环境以及地下水的潜在威胁,对农田非点源污染的管理与预防具有重大意义.

The research of nitrogen load on farmland ecosystem of liaoning province

This study estimated the nitrogen budget of the farmland ecosystem in Liaoning Province by farmland nutrient balance calculated using GIS tools. The results show that: the total nitrogen input to the region was 1.40E+09 kg a-1. Total nitrogen output from the region was 9.28E+08 kg a-1, resulting in a nitrogen load of 4.68E+08 kg a-1. 56.75% of the total nitrogen input come from the use of chemical fertilizers, 18.73% of the total nitrogen input come from the use of organic fertilizer nitrogen. Liaoning Province 2007-2009 three-year average per unit area nitrogen input is 358.94kg·ha-1·a-1 .The average nitrogen output per unit area is 240.37 kg·ha-1·a-1, the average nitrogen load is 118.57 kg·ha-1·a-1. Through the study of the farmland ecosystem nitrogen load of 14 districts in Liaoning Province, we can predict the potential damage of the different areas of farmland nitrogen load the Liaohe basin water environment as well as groundwater great significance of farmland non-point source pollution management.