沐川县水源涵养能力变化研究

本研究基于多年多源数据,采用水量平衡法计算出沐川县多年水源涵养量,利用线性回归分析得到了沐川县的水源涵养能力变化情况。研究表明:沐川县水源涵养能力变化较大,中西部区域水源涵养能力明显增强,东北区域偏北方向水源涵养能力呈现下降趋势,中东部区域水源涵养能力呈现减弱趋势,中部区域及东南部分区域水源涵养能力呈现明显减弱趋势。整体来看,区域内水源涵养能力增强区域略多于减弱区域。主成分分析方法显示,研究区水源涵养变化的首要驱动因素为高程,可以看作植被涵养水源能力,次要驱动力为降水量、植被覆盖度和地表温度,可以看作水分的流动分布情况。

Based on years of multi-source data, the water balance method was used to calculate the amount of water conservation in Muchuan County, and the linear regression analysis was used to get the change of water conservation capacity in Muchuan County. The results showed that the water conservation capacity of Muchuan County changed greatly, the water conservation capacity of the central and western regions was obviously enhanced, the water conservation capacity of the north-eastern region showed a downward trend, and the water conservation capacity of the central and eastern regions showed a weakening trend. The water conservation capacity of the central region and the southeast part of the region showed a significant weakening trend. Taken as a whole, the enhanced water conservation capacity in the region is slightly stronger than the weakened area. The principal component analysis method shows that the primary driving factor of water conservation change in the study area is elevation, which can be regarded as vegetation water conservation ability, and the secondary driving forces are precipitation, vegetation cover and land surface temperature.It can be regarded as the flow and distribution of water.