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Human Activity Impact on Runoff of Shiyang River Basin in the Last 20 Years Based on Remote Sensing Data

WANG Jie,YE Bai-sheng,WU Jin-kui,HE Xiao-bo(State Key State Laboratory of Cryospheric Science,CAREERI,CAS,Lanzhou Gansu 730000,China)  
The human activities,especially the agricultural activities in the middle and lower reaches of Shiyang River,have great impact on the runoff of the Shiyang River in the recent 20 years.The impact was analyzed by using the NDVI data,the cumulative values of agriculture oasis based-on ERDAS,combined with the discharge data of Shiyang River from 1982 to 2003.It is revealed that the discharge in Caiqi Station sharply decreased while the discharge of the outlets of Qilian Mountain varied weakly.The cumulative NDVI in the middle reaches showed a significant negative correlation with the discharge of Caiqi Station,but a positive correlation with the discharge difference between the upper reaches and lower reaches.Furthermore,bordered in 1992,the correlation between the cumulative NDVI and the discharge difference in 1993—2003 was better than that in 1982—1992.It implies that human activities lead to a decrease of runoff in the lower reaches and a greater effect after 1992.However,there was no positive relationship between discharge in Caiqi Station and the cumulative NDVI in the lower reaches. This may attribute to the overexploitation of groundwater in the downstream oasis.In addition,the spatial-temporal analyses of the cumulative NDVI show that there is an extending tendency of agriculture oasis in the middle reaches towards the lower reaches,while the Minqin Oasis in the lower reaches seems advance westwards and retreat from east.
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