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以商洛市为例,利用In VEST产水量模型和多年平均涵养水量模型,以参数本地化、实地率定和结果验证,对该区水源涵养功能的空间格局分异规律及其影响因素进行分析。结果表明:1商洛市水源涵养总量为27.48×108m~3/a,水源涵养能力为324.85 mm。五大流域水源涵养功能依次为旬河>乾佑河>金钱河>丹江>洛河。2气候因素对产水能力空间格局影响最大,10 a土地利用变化和下垫面植被、土壤因素则对水源涵养空间异质性影响显著。3子流域单元产水能力相关性强的因子为多年平均降水、实际蒸散发和植物可利用水,水源涵养功能关键驱动因子是潜在蒸散量、土壤饱和导水率与森林覆盖率。
Taking Shangluo City as an example, this paper analyzed the spatial pattern of water conservation function and its influencing factors by using the model of In VEST water production and the model of multi-year average water conservation with parameter localization, field rate determination and result verification. The results showed that: 1 The total water conservation of Shangluo City was 27.48 × 108m ~ 3 / a, and the water conservation capacity was 324.85 mm. The water conservation functions of the five major river basins were as follows: Xunhe> Qiangyouhe> Qianhehe> Danjiang> Luohe. The climatic factors have the greatest impact on the spatial pattern of water productivity. The changes of land use and underlying surface vegetation and soil factors in the 10 years have a significant impact on the spatial heterogeneity of water conservation. 3 Factors that have a strong correlation with water production capacity of subbasin units are the mean annual precipitation, actual evapotranspiration and plant available water. The key driving factors for water conservation function are potential evapotranspiration, soil saturated hydraulic conductivity and forest coverage.