用SWAT模拟土地利用对绿水蓝水的影响:以晋江西溪流域为例

Simulation of the Effect of Land Use/Cover Change on Green and Blue Water Resource in Xixi Watershed of Jinjiang Basin with SWAT Model

应用SWAT模型,研究了晋江西溪流域土地利用/覆被变化(LUCC)对绿水与蓝水资源时空分布的影响。结果表明,土地利用变化导致的西溪流域绿水资源从1970年代的年均625.34 mm减少到2001年的618.5 mm,年绿水总量平均减少了6.48 mm;蓝水资源从1970年代的年均1 019.44 mm增加到2001年的1 026.49 mm,年蓝水总量平均增加了7.05 mm。土地利用变化造成年内12个月份的绿水都有所减少,蓝水都有所增加,其中处于汛期的6-9月蓝水增加量较大。由于流域上游几个亚流域的林地耕地面积之和大幅减少等原因,绿水的减少与蓝水的增加主要集中于流域上中游的几个亚流域。

The temporal and spatial impacts on green and blue water of land use and land cover changes were investigated using the Soil and Water Assessment Tool （SWAT） model for Xixi watershed of Jinjiang basim Results showed that depth of the green water decreased from 625.34 mm in 1970s＇ to 618.5 mm in 2001, which decreased by 6.48 mm, and depth of the blue water increased from 1 019.44 mm in 1970s＇ to 1 026.49 mm in 2001, which increased by 7.05 ram, because of the land use change. Due to the land use change, the green water depths of each month of year all decreased, and the blue water depths of each month of year all increased, and the added blue water in flood season was more than that in low water season. Because the forest and farm land of upstream sub-basins decreased considerably, reduction of the green water and growth of the blue water mostly located at upstream and central sub-basins.