彭州市立体农业气候资源的研究(一)降水资源分析

Study of three-dimensional agroclimatic resources in Pengzhou

分析了彭州市境内位于不同海拔高度的 4个观测站的降水资料 ,结果表明 ,彭州市雨量充沛 ,但降水量的年际变化显著 ,雨季起、止时间和雨季长、短的年际变化很大 ,降水的时间分配极不均匀。因为这 4个站具有相同的气候背景 ,降水量的年、季、月变化呈现基本一致的规律和趋势 ,但因为海拔高度不同等气候背景的差异 ,4站的降水特点又显著不同。降水量随海拔高度的升高而增加 ,降水变幅和雨日也随海拔高度的升高而增加 ,大降水过程具有明显的局地性 ,不同海拔高度的旱、涝情况亦有差异 。

The precipitation data obtained at 4 stations at different altitudes in Pengzhou are analyzed. The results show that the rainfall there is rich and the interannual changes are notable. The beginning and end dates of the rainy season changes every year. The patterns of the rainfall changes at the 4 stations are same due to the same climate. But due to the different microclimate the amount, the change range and the interval of the rainfall there increase with the altitude. Hence the spatial distribution of the rainfall possesses a marked three dimensional characteristic.