丹江口库区气候变化及对生态环境的影响

利用库区水源地(南阳区域)跨越的4个县(市)1974~2003年的气候资料,分析了库区水源地近30年的气候变化特征,结果表明:库区水源地近年来年平均气温呈明显递增趋势,特别是近10年来气温增幅明显;降水的年际变化大,季节分布不均,近年来有秋雨增多、春旱频发的趋势,自1996年起,降水气候特点呈连续干旱和持续雨涝的变化特征;库区水源地北部山区降雨量偏多,南部、东南部及丘陵垄岗地区降水偏少,近10年来强降雨日数较前期增幅明显。这种气候变化趋势对水源地的水资源和自然生态环境造成了直接或潜在的影响,并可能继续产生明显影响。

Impacts of Climate Change on Ecological Environment in Reservoir Area of Danjiangkou

Basing on climate data during 1974~2003,the paper analyses the climate change of the riverhead of Danjiangkou.The results indicate the mean annual temperature is increasing obviously,especially in recent 10 years.The interannual change of precipitation is increasing.The season distribution shows that autumn rain and spring drought happen frequently;and continuous drought and flood occur frequently since 1996.There is more rain and rain days in the north part of the reservoir area than in the south and east-south part.The climate change will affect water resource and ecological environment.