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为了解土地利用的组合方式对氮磷输出的影响,在广泛收集土地利用输出系数的基础上,基于遥感和GIS手段,分析了大伙房水库控制流域内营养物质氮磷的输出风险.结果表明,大伙房水库控制流域非点源污染输出的风险概率比较小,氮素和磷素的风险概率平均为19.31%和8.95%.但在空间分布上差异很大,风险概率高的地方一般在主要的河流附近,沿河流流向延伸.而其它区域的风险概率相对较低.此外,营养物质输出风险随着坡度不同差别比较大,而在行政区内差别不明显.
In order to understand the impact of land use combinations on the output of nitrogen and phosphorus, based on the extensive collection of output coefficients of land use, based on remote sensing and GIS, the output risk of nitrogen and phosphorus of nutrients in the controlled watershed of Dahuofang Reservoir was analyzed. The risk probability of non-point source pollution output in the control basin of Dahuofang Reservoir is relatively small, and the risk probability of nitrogen and phosphorus is 19.31% and 8.95% on average, but the spatial distribution is quite different and the risk probability is high, In the vicinity of the river, the flow extends along the river, while the risk probability of other areas is relatively low. In addition, the risk of export of nutrients varies greatly with different slopes, but not obvious in the administrative areas.