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首页> 外文会议>Geoinformatics 2008 and joint conference on GIS and built environment : Monitoring and assessment of natural resources and environments >A GIS Based Estimation of Loss of Particulate Nitrogen and Phosphorus in Typical Drainage Area of Pearl River Delta
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A GIS Based Estimation of Loss of Particulate Nitrogen and Phosphorus in Typical Drainage Area of Pearl River Delta

机译：基于GIS的珠江三角洲典型流域颗粒氮磷损失估算。

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The output of nitrogen and phosphorus from agricultural activities is the main source for water eutrophication. The fully developed agriculture in vegetables, fruits and flowers in Pearl River Delta gives rise to excessive use of chemical matter such as fertilizer and pesticide and thus bring about the serious water pollution because of the loss of nitrogen (N) and phosphorus (P) from the farmland in the region. Based on Geographic Information System (GIS) and soil pollution data, Universal Soil Loss Equation (USLE) and source type method are used to estimate the loads of particulate N and P from the soil of different land use types in the drainage area of Liuxi River in Guangzhou, China. So the key regions those the NPS pollution occurred can be confirmed and the technical support for the pollution control target and the capital flow concentration can be provided by the results. The study shows that, (1) The total loss of particulate N and P in the drainage area is 582.49 t/a and 424.74 t/a respectively. Among them the loss of particulate N from paddy soil occupies 40.02% and that of forest 6.31%, while the loss of particulate P from the soil of dry-land accounts for 28.75% and that of paddy soil 26.31%. (2) There are significantly different losses of particulate N and P per unit area from the soils of different source land use types in the drainage area. The losses of particulate N and P per unit area are both the highest from the soil of dry-land, which is 7.72 kg/hm2 and 9.50 kg/hm2 respectively, followed by those of orchard, which is 7.20 kg/hm2 and 6.56 kg/hm2 respectively. The causes are excessive use of chemical matter, unreasonable cultivation pattern, and the soil erosion of different land use. (3) The excessive N and P come from the loss of particulate N and P from the fertilization in agricultural production, and they are the main source of the pollutants in Liuxi River water.
机译：农业活动产生的氮和磷是水富营养化的主要来源。珠江三角洲蔬菜，水果和花卉的充分发展农业导致肥料，农药等化学物质的过度使用，由于氮，磷的损失造成严重的水污染。该地区的农田。基于地理信息系统（GIS）和土壤污染数据，利用通用土壤流失方程（USLE）和源类型方法，估算流溪河流域不同土地利用类型的土壤中氮，磷的负荷在中国广州。因此，可以确定发生NPS污染的关键区域，并通过结果为污染控制目标和资金流向浓度提供技术支持。研究表明：（1）流域N，P颗粒物的总损失分别为582.49t / a和424.74t / a。其中，水稻土氮素损失占40.02％，森林损失6.31％，而旱地土壤磷素损失占28.75％，水稻土26.31％。 （2）流域内不同来源土地利用类型的土壤每单位面积的氮和磷颗粒损失显着不同。旱地土壤中每单位面积的颗粒氮和磷损失均最高，分别为7.72 kg / hm2和9.50 kg / hm2，其次是果园，分别为7.20 kg / hm2和6.56 kg / hm2。原因是化学物质的过度使用，不合理的耕作方式以及不同土地利用方式的水土流失。 （3）氮，磷的过量产生是由于农业生产中施肥造成的氮，磷颗粒流失，是流溪河水体污染物的主要来源。

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