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王玉纯,赵军,付杰文,魏伟.石羊河流域水源涵养功能定量评估及空间差异研究*.生态学报,2018,(13).http://dx.doi.org/10.5846/stxb201707041204  
石羊河流域水源涵养功能定量评估及空间差异研究*
Quantitative assessment of water conservation function and spatial pattern in Shiyang River basin
投稿时间:2017-07-04  修订日期:2018-02-07
DOI: 10.5846/stxb201707041204
关键词水源涵养  InVSET模型  产水量  石羊河流域  退耕还林还草
Key Wordswater conservation  InVEST model  water yield  Shiyang River Basin  returning farmland to forest and grassland
基金项目国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
王玉纯 西北师范大学地理与环境科学学院 wyc18894017342@163.com 
赵军 西北师范大学地理与环境科学学院 zhaojun@nwnu.edu.cn 
付杰文 西北师范大学地理与环境科学学院  
魏伟 西北师范大学地理与环境科学学院  
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摘要:
水源涵养功能是流域生态系统的重要服务功能之一和可持续发展的关键因素。采用InVEST模型,通过参数本地化,定量评估了石羊河流域产水量及水源涵养功能,在此基础上对水源涵养功能重要性进行分级,通过模拟不同退耕情景,分析其产水量及水源涵养功能的差异。结果表明:(1)InVEST模型中的Zhang系数为2.1时,研究区产水量模拟效果最佳;研究区2015年单元平均产水深度值为60.90 mm,产水总量为24.71×108 m3;单元平均水源涵养量为23.97 mm,水源涵养总量为1.35×108 m3;单元产水深度与单元平均水源涵养量空间分布均呈现出南高北低的趋势;研究区不同地类单元水源涵养能力以林地最强,草地的水源涵养总量最大。(2)研究区内水源涵养功能一般重要级别区域占总面积的53.94%,极重要和高度重要级别共占总面积的22.40%。(3)根据不同退耕模式情景模拟结果,研究区林地面积最大时,单元水源涵养量及水源涵养总量均最高;随着林地、草地面积的增加,产水量有所减少,且林地面积最大时,产水量最少;基于最小模糊度法,确定了研究区合理退耕还林还草模式。
Abstract:
Water conservation function is one of the most important ecosystem service functions of river basin ecosystems, and it is also the key factor for sustainable development.We used the InVEST model to quantitatively evaluate the water yield and conservation function of the Shiyang River Basin using parameter localization, and graded the importance of water conservation function. Furthermore, we analyzed the differences in the water yield and water conservation function by simulating different farmland conversion scenarios. We obtained the following results:(1)When the Zhang value was 2.1 in the InVEST model, the simulation results of the water yield in the study area were the best. The average water production depth in the study area was 60.90 mm, and the total water yield was 24.71×108 m3.The average water conservation of the unit was 23.97 mm, and the total water conservation was 1.35×108 m3 in 2015. The unit water depth and average spatial distribution of the water conservation unit showed a north-south high-low trend. The unit and total water conservation capacities were the highest for the forest and the grassland,respectively.(2)The water conservation function of the generally important area which refers to poor water conservation function had a proportion of 53.49%,whereas the very important region accounted for 22.40% of the total area.(3)The scenario simulation results of the different returning farmland models revealed that when the forest area was the largest, the water conservation capacity and the total water conservation amount were the highest. Furthermore, increasing the forest land and grassland area decreased the water yield, and when the forest area was the largest, the water yield was the lowest. Based on the minimum ambiguity method, a model of returning farmland to forest and grassland was developed.
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