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Spatio-Temporal Changes of Runoff Processes and Underlying Driving Forces in Guizhou,Southwestern China (1956~2000)

YANG Tao1,CHEN Xi1,XIE Hai-wen2,XU Chong-yu3(1.State Key Laboratory of Hydrology-Water Resources and Hydraulics Engineering,Hohai University,Nanjing 210098,China;2.Nanjing Division of Jiangsu Provincial Bureau for Hydrology and Water Resources,Nanjing 210008,China;3.Department of Geosciences,University of Oslo,Norwa)  
In this study,spatio-temporal changes in annual precipitation,evaporation,temperature,solar rediation and stream flow in the karst region of Guizhou,southwestern China(1956~2000) were examined using the Mann–Kendall trend analysis,singular-spectrum analysis(SSA),Lepage test,and flow duration curves(FDCs).Results indiacated that: 1) The stream flow during 1956~2000 increased slightly in most catchments;2) the region of Guizhou experienced significant changes in seasonal stream flow distribution during the posterior record(1987~2000) compared with those in prior periods(1956~1986),of which,most catchments showed increasing values of the coefficient of variation for monthly stream flow;3) the map of stream flow distribution identified reduction of the monthly flow in the northwestern part and increase in the rest parts.The spatial patterns revealed by precipitation and evaporation map are closely associated with those of stream flow,suggesting the impact of climate changes is the prime driving forces dorminating the changes of hydrological processes in Guizhou.The results are beneficial for formulating the regional strategy of water resources management for such a environmentally fragile region.
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