本文基于子午岭林区面积大幅度下降的事实,对比毁林前后两阶段林区与其外围地区气象站的降水观测资料,重点分析了毁林前后局部地区对流性降雨的变化。

In view of the fact that the large forest regions on the Ziwuling have disappeared, the author makes statistics and analysis of July convective rain from the Taibai station in forest region and the ten meteorological stations nearby the Ziwuling.The results show: 1) After the forest region was destroyed, there was a marked decrease in the convective rainfall in northeast and southeast of this area, 2) The significance test of the average of convective rainfall shows that forest regions destroyed can only bring up a few of the regions of the total differences of convecti venfall. These regions are Xunyi and Tongcuan in southeast of Ziwuling. 3) Now the variabities of convective rainfall enlarge more obviously than that before the forest region was destoryed.