沁河源区水源涵养功能辐射效益研究

以沁河源区为例，分析了水源涵养功能空间分布特征，通过构建辐射效益评估模型，估算了其水源涵养辐射量，并对辐射量和水源涵养量进行了对比。结果表明:（1）沁河源区75.40%的区域覆盖着落叶阔叶林和常绿针叶林，土壤以粉砂壤土和壤土为主，渗透性较强，水源涵养量均值234.75 m³，总量3.52亿m³，水源涵养辐射量均值168.41 m³，总量2.14亿m³；（2）99.30%的林地具有水源涵养辐射效益，林地斑块的实际辐射量占供给量的64.89%，辐射总量1.91亿m³；（3）97.12%的草地具有水源涵养辐射效益，草地斑块的实际辐射量占供给量的97.76%，辐射总量0.22亿m³；（4）94.89%的耕地具有水源涵养辐射效益，耕地斑块的实际辐射量占供给量的92.98%，辐射总量0.24亿m³。

Study on Radiation Benefit of Water Conservation Function in the Headstream Area of the Qinhe Basin

The spatial distribution characteristics of water conservation function and radiation benefit were analyzed via constructing a radiation benefit assessment model. The amount of radiation benefit and water conservation function were compared. The results showed that: (1) 75.40% of the study area was covered by deciduous broad-leaved forests and evergreen coniferous forests; loam and silt loam are the main soil types in the study area, these soils have the strong permeability, the mean volume of 234.75 m³ water and a total volume of 0.352 billion m³ water were conserved in the study area, the mean volume of 168.41 m³ water and a total volume of 0.214 billion m³ water were radiated in the study area; (2) 99.30% of forestlands have radiation functions and the actual radiation amount of forest patch accounts for 64.89% of the water conservation capacity, which provide the total amount of radiation of 0.191 billion m³; (3) 97.12% of grasslands and an average of 97.76% of water conservation capacity have radiation function, which provides a total amount of radiation of 2.2 billion m³; (4) 94.89% of farmland and an average of 92.98% of water conservation capacity have radiation functions, which provide a total amount of radiation of 24 million m³.