Impacts of Climate Change and Human Activities on Water Suitability in the Upper and Middle Reaches of the Tao’er River Area |
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| Authors: | CHEN Sujing LI Lijuan LI Jiuyi LIU Jiaxu |
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| Institution: | 1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Due to the impact of climate change and human activities, the upper and middle reaches of the Tao’er River have become an ecologically sensitive area in Northeast China. It is important to evaluate the contributions of climate change and human activities to water suitability in the Tao’er River area. From the perspective of water and heat balance, the water suitability index (cr) was used to analyze the water suitability of the upper and middle reaches of the river. The nonparametric Mann-Kendall, moving t-test and cumulative anomaly methods were used to detect abrupt changes in Taonan station runoff from 1961 to 2012. Three inflexion years were detected. Thus, the entire time period was divided into four periods: 1961-1974, 1975-1983, 1984-1998, and 1999-2012. In order to estimate the impacts of climate change and human activities on runoff, the slope change ratio of cumulative quantity (SCRCQ) was adopted. Finally, the contribution of climate change and human activity to cr was transformed from the contribution of climate change and human activity to runoff by the sensitivity coefficient method and SCRCQ method. The results showed that the water suitability index (cr) had a decreasing trend 1961-2012. Factors influencing cr, such as net radiation and runoff, also exhibited a decreasing trend, while precipitation exhibited an increasing trend over the past 52 years. The trends of cr, net radiation and runoff were obvious, which passed the Mann-kendall test of significance at α=0.05. Human activities were the main factors that affected runoff, although the degree of impact was different at different times. During the past 52 years, the biggest contributor to the change in cr was precipitation. |
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| Keywords: | climate change human activities water and heat balance water suitability |
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