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《Geographical Research》 2018-09
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Soil erosion and water supply change in Qihe watershed of Taihang Mountains from 2000 to 2015

HE Shasha;YE Lupei;ZHU Wenbo;CUI Yaoping;ZHU Lianqi;College of Environment and Planning, Henan University;  
The changes of soil erosion and water supply of mountain ecosystem plays an important role in assessing regional ecological environment.Based on four-stage land use change data from 2000 to 2015,this study assessed the changes of main ecosystem services in Qihe watershed of Taihang Mountains with the assistance of In VEST model.The results showed that:(1)The main types of land use were cultivated land,grassland,and woodland accounting for more than 90%of the total area of the Qihe watershed.During the 16-year study period,cultivated land decreased obviously,and grassland,water,and construction land all increased.(2)The soil erosion modulus decreased from 154.27 t/(hm~2·a)in 2000 to 32.09 t/(hm~2·a)in 2015,indicating that the average soil erosion modulus decreased obviously from2000 to 2015.The area rates of land with strong erosion,extreme erosion,and severe erosion decreased from 9.04%,12.19%and 25.96%to 7.17%,6.36%and 4.21%,respectively,while those of land with slight erosion,mild erosion,and moderate erosion increased from 24.31%16.96%and 11.57%to 41.89%,27.71%and 12.68%,respectively.The measures of returning farmland to forest and grassland have optimized the land use pattern,promoted vegetation restoration,and played a significant role in soil erosion control.(3)The volumes of water supply in the watershed increased firstly and then decreased during 2000-2015,and reached the peak of 179 million m~3in 2005.The volumes of water supply in two adjacent periods were different.The increased areas and volumes of water supply were more than decreased areas and volumes from 2000 to 2005,showing that the water supply capacity was enhanced.However the water supply capacity weakened during 2005-2010 and 2010-2015,with the latter period seeing a smaller reduction.The increase of forest land and grassland area resulted in the decrease of water supply and the enhancement of soil water conservation capacity.Soil erosion and water supply are important indicators representing mountain ecological vulnerability.It is important to take concrete measures in soil and water conservation so as to enhance the service ability of mountain ecosystem.
【Fund】: 国家重点基础研究发展计划项目(973计划 2015CB452702);; 国家自然科学基金项目(41671090 41401504)
【CateGory Index】: TU991.11;S157.1
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