Response of hydrological processes to land-cover and climate changes in Kejie watershed, south-west China
Ma, Xing2,3; Xu, Jianchu1; Luo, Yi4; Aggarwal, Shiv Prasad5; Li, Jiatong6
摘要Land-cover/climate changes and their impacts on hydrological processes are of widespread concern and a great challenge to researchers and policy makers. Kejie Watershed in the Salween River Basin in Yunnan, South-West China, has been reforested extensively during the past two decades. In terms of climate change, there has been a marked increase ill temperature. The impact of these changes oil hydrological processes required investigation: hence, this paper assesses aspects of changes in land cover and climate. The response of hydrological processes to land-cover/climate changes was examined using the Soil and Water Assessment Tool (SWAT) and impacts of single factor, land-use/climate change on hydrological processes were differentiated. Land-cover maps revealed extensive reforestation at the expense of grassland, cropland, and barren land. A significant monotonic trend and noticeable changes had Occurred in annual temperature over the long term. Long-term changes in annual rainfall and streamflow were weak; and changes in monthly rainfall (May, June, July, and September) were apparent. Hydrological simulations showed that the impact of climate change oil Surface water, baseflow, and streamflow was offset by the impact of land-cover change. Seasonal variation in streamflow was influenced by seasonal variation in rainfall. The earlier onset of monsoon and the variability of rainfall resulted in extreme monthly streamflow. Land-cover change played a dominant role in mean annual Values; seasonal variation in surface water and streamflow was influenced mainly by seasonal variation in rainfall; and land-cover change played a regulating role in this. Surface water is more sensitive to land-cover change and climate change: an increase in surface water in September and May due to increased rainfall was offset by a decrease in surface water due to land-cover change. A decrease in baseflow caused by changes in rainfall and temperature was offset by all increase in baseflow due to land-cover change. Copyright (C) 2009 John Wiley & Sons, Lid.
关键词Land-cover Change Climate Change Swat Hydrological Processes Watershed
资助信息This study was a part of the Project on 'Too much water, too little water adaptation strategies to Climate induced water stress and hazards in the Greater Himalayan region supported by the Swedish International Development Cooperation Agency (Sida) through the International Centre for Integrated Mountain Development (ICIMOD). It is part of the Global Research Priority (GRP6) of the World Agroforestry Centre supported by the European Union (EU) as well as the M-POWER-Mekong Program on Water Environment & Resilience, CGIAR Challenge Program on Water and Food with funding from Echel-Eau and the International Fund for Agricultural Development (IFAD). We also thank the Centre for Space Science Technology Education in Asia and the Pacific (CSSTEAP) for providing the latest imagery. We would like to express Our gratitude to the staff of Baoshan Hydrological and Meteorological Bureau for their cooperation and their assistance in collecting the hydrological and meteorological data. We sincerely thank two anonymous reviewers for their valuable comments for final version and editing from Greta Rana.
作者单位1.World Agroforestry Ctr China Program, Kunming 650204, Peoples R China
2.CAS, Kunming Inst Bot, Kunming 650204, Peoples R China
3.Yunnan Inst Environm Sci, Kunming 650034, Peoples R China
4.Chinese Acad Sci, Inst Geog Sci & Nat Resource Res, Beijing 100101, Peoples R China
5.NRSA, Indian Inst Remote Sensing, Dehra Dun 248001, Uttar Pradesh, India
6.Baoshan Hydrol Bur, Baoshan 678000, Peoples R China
GB/T 7714
Ma, Xing,Xu, Jianchu,Luo, Yi,et al. Response of hydrological processes to land-cover and climate changes in Kejie watershed, south-west China[J]. HYDROLOGICAL PROCESSES,2009,23(8):1179-1191.
APA Ma, Xing,Xu, Jianchu,Luo, Yi,Aggarwal, Shiv Prasad,&Li, Jiatong.(2009).Response of hydrological processes to land-cover and climate changes in Kejie watershed, south-west China.HYDROLOGICAL PROCESSES,23(8),1179-1191.
MLA Ma, Xing,et al."Response of hydrological processes to land-cover and climate changes in Kejie watershed, south-west China".HYDROLOGICAL PROCESSES 23.8(2009):1179-1191.
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