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[1]LI Shiqi,Yang Qingxia,LIU Junyan,et al.Impact of Forest Cover Change on Runoff in Jiuzhaigou Basin[J].Research of Soil and Water Conservation,2023,30(01):106-112.[doi:10.13869/j.cnki.rswc.2023.01.010]

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Impact of Forest Cover Change on Runoff in Jiuzhaigou Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 01 Page number: 106-112 Column: Public date: 2023-01-10

Title:: Impact of Forest Cover Change on Runoff in Jiuzhaigou Basin

Author(s):: LI Shiqi^1,3, Yang Qingxia², LIU Junyan^1,3, Wang Panpan², YAN Xianchun³, LIAO Yuchen¹, CHEN Qi^1,3, XIE Yu¹, WU Yan¹; (1.Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China; 2.Jiuzhaigou Nature Reserve Administrative Bureau, Abazhou, Sichuan 623402, China; 3.College of Life Science, China West Normal University, Nanchong, Sichuan 637002, China)

Keywords:: Jiuzhaigou basin; forest cover change; SWAT; runoff simulation

CLC:: S715.3

DOI:: 10.13869/j.cnki.rswc.2023.01.010

Abstract:: Studies on runoff responses to cover change are hotspots in watershed hydrology and closely related to the conservation of core heritage value of water landscape in Jiuzhaigou, so the study of water resources in Jiuzhaigou watershed is an urgent problem. We used SWAT model simulations as the basic research tool to quantitatively study the watershed hydrology due to forest cover changes in Jiuzhaigou watershed during 2009—2017, and investigated the response mechanism of Jiuzhaigou watershed to forest cover changes. The results show that:(1)the decision parameters R² and E_ns and the Nash efficiency coefficient were 0.83 for the calibration and were 0.7 for the validation, indicating that the SWAT model had high applicability to the runoff simulation in the Jiuzhaigou basin.(2)the forest cover within the Jiuzhaigou watershed exhibited an increasing trend from 2004 to 2016, with coniferous forest area increasing 10.56 km² and broadleaf forest area decreasing 2.57 km²;(3)the average annual runoff under forest cover in 2016 increased 0.13 m³/s within 9 years compared to 2004; compared to broadleaf forests, the coniferous forests presented a worse interannual variability in water storage and better intra-annual flood regulation and replenishment variabilities;(4)under the same meteorological conditions, monthly runoff increased by 25.93% in the high-water period and decreased by 9.86% in the dry period in 2016 compared to that in 2004. Overall, these results elucidate the ecological benefits derived from forest cover changes in the reserve, and can provide a scientific basis for conserving core values of water landscape and ecological management in Jiuzhaigou.

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Last Update: 2023-01-10