关键词: 低温考察, 坡地逆温, 特征分析

Abstract: The fruit trees planted in slopping fields presented different characters of damage under the influence of severe low temperature in Fujian province.For avoiding or mitigating the freezing loss,it was so important to study the characters of inverse temperature on slopping fields and select appropriate slopping fields to plant fruit trees.To study the characters of the inverse temperature,the minimum temperature in winter was investigated in different positions of slopping fields in 2007-2008 in Yongtai County of the Fujian Province.The result showed that the minimum temperature often appeared in sunny days in the hills with relative slopping ratio by 0.7 where altitude gaps were approximate 300m,where the maximum inverse temperature gap reached at 1.9℃.The characters of the inverse temperature of slopping fields showed that the locations of slopping fields where the maximum inverse temperature appeared were anti-related to the total altitude gaps of hills,based on the investigation data of ten slopping fields in four counties in the Eeastern Fujian.On one hand,with increase of the total altitude gaps,the altitude of location where the maximum inverse temperature appeared was decreased.On the other hand,with the decrease of push-join(the ratio of azimuth of push and 360),the altitude of location where the maximum inverse temperature appeared was increased.To sum up,the maximum inverse temperature gaps were correlation to the push-join,grade and total altitude gaps of slopping fields.With the decrease of push-join,the maximum inverse temperature decreased,and with the increase of grades,the maximum inverse temperature increased.Furthermore,with the increase of the total altitude gaps of hills,the maximum inverse temperature gaps decreased when the drop-join and grades of slopping fields were not changed.

Key words: Investigation of low temperature, Investigation of low temperature, Inverse temperature of slopping field, Character analysis