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| Climate Change and Its Significance on the Runoff of Major Rivers in Gansu, China from 1961 to 2011 |
| Hua Ting1, Wang Xunming1,2, Lang Lili2, Zhang Caixia1 |
1. Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. Key Laboratory of Water Cycle & Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Science, Beijing 100101, China |
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Abstract By employing grid data and observed records, the temperature and precipitation trends and their significances on runoff of rivers originated in most regions of Gansu Province were discussed. Trend analyses show that from 1961 to 2011, most of the study area experienced significant (p<0.05) increases in temperature, while there were opposing trends for precipitation in regions to the east and west of Wushaoling Mountain. Temperature and precipitation trends played different roles on the runoff among each sub-regions. Over the past five decades, due to the significant increases of precipitation, the Heihe River and Shulehe River originated in the west of Wushaoling Mountain has experienced significant increase in runoff; while due to the significant decrease in precipitation and temperature rise occurred in their drainage basins, the other rivers suffered from decreased runoff. In the whole regions, correlation analyses show that the runoff of rivers is more closely related with precipitation(R=0.735, p<0.0005) than that of temperature(R=-0.541, p<0.0005). At a large time scale, owing to the enhancements of evaporation motivated by temperature rise, there is an obvious decreasing trend in runoff of rivers originated in Gansu Province.
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Received: 12 May 2014
Published: 20 May 2015
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2015, Vol. 35 
