全球气候暖干化对秦岭南北河流径流泥沙的影响研究

以秦岭南侧汉江和北侧渭河多年的径流泥沙观测资料，分析了全球气候暖干化对秦岭南北径流泥沙的变化。分析指出在80年代后，由于全球气候变化的影响，秦岭南北河流年均径流量均减少，与1935－1980年相比，汉江河流年均径流量减少1.9%，渭河河流年均径流量减少27.4%；同时汉江河流泥沙含量明显减少，但渭河河流泥沙含量呈增加趋势，是汉江河流泥沙含量133倍，表明了秦岭南北两侧在全球气候暖干化表现出明显的区域响应性。

Study on the Influence of Global Climatic Warming and Drying on the Silt Content in Hanjiang and Weihe Rivers in the Southern and Northern Marginal Zones of Qinling Mountain

Natural environment change, especially the global climate change, has been extensively paid a great attention to. The observed data reveal that the 1990's was the warmest period in history, precipitation and surface runoff reduce in some regions. As a boundary area of the southern and northern climatic regions in China and located in the region of middle latitudes, Qinling Mountain is a representative geographical unit. It is very significant to research the change of the runoff and the silt content in the rivers in the southern and northern marginal zones in Qinling Mountain and to analyze the response of the climatic environment in these two marginal zones to the global climate change. This paper analyzes the influence of global climatic warming and drying on the runoff and the silt content of Hanjiang and Weihe rivers in the southern and northern marginal zones of Qinling Mountain respectively. The results show that the annual runoff volumes of these two rivers have reduced for 1.9% and 27.4% respectively since the 1980's than that before 45 years due to the global climate change. The silt content in Hanjiang River has reduced obviously but increased in Weihe River, it in the latter is 133 times of that in the former, which reveals that the regional response in the southern and northern marginal zones of Qinling Mountain to global warming and drying is different.