岷江上游气候立体分布特征

通过对岷江上游的气候要素的时空间分布特征进行分析,得出:岷江上游的气候干、雨季分明;气温与海拔高度的相关关系为2 500 m以下呈现负相关,而2 500 m以上呈现正相关;降水随高度增加呈增加趋势;而农田蒸散量和干燥度均与海拔高度呈负相关关系。高海拔地区凉爽而湿润,其限制因子主要是热量;而中低海拔地区温暖而干旱,主要限制因子是水分。通过回归分析,得出了岷江上游主要气象要素与海拔高度的关系。认为在岷江上游地区,开展生态恢复,应具体分析光热水状况,在不同海拔地区,针对不同的气候条件,采用相应的植物来进行生态恢复,以取得良好的生态和经济效应。

Distribution of Climatic Elements in the Upper Reaches of Minjiang River

Based on the analysis of spatio-temporal distributions of climatic elements in the upper reaches of Min-jiang River, the results indicate that climatic elements show differences in rainy and dry season. Air temperature is positively under 2 500 m and negative above 2 500 m, correlated to altitude. Precipitation increases with altitude. Evapotranspiration and dryness of the field is negatively correlated to altitude respectively. Being cool and humid, the region of high altitude is lack of heat;and the region in middle and low altitudes is warm and dry, water is the control factor. Besides, the correlation between main climatic elements and altitude was studied based on regression analysis. The ecological restoration within the upper region of Minjiang River therefore demands a knowledge of climatic characteristics in order to exploit the beneficial ecological effects.