摘要
用主成分分析法对抽取的７７个有桑天牛分布县市的气候资料进行了分析。从２１个气候变量中找出１月份均温、秋季温度、冬季温度、全年均温、夏季温度、７月份均温、春季均湿、全年均湿、夏季降水量、秋季均湿是影响桑天牛分布的主要气候变量，并求出了这些变量的取值范围，也即桑天牛分布区的温湿度阈值。
In this paper,the climatic data from 77 counties and cities where Apriona germari was distributed,were analyzed by the method of principle component analysis(PCA).In 21 climatic factors,monthly mean temperature in Jan.,autumn and winter temperature,annual mean temperature,summer temperature,monthly mean temperature in July,spring mean humidity,annual mean humidity,summer precipitation and autumn mean humidity were the important factors which effected the distribution of Apriona germari.The result showed that the obtainedranges of these factors were the threshold of temperature and humidity for Apriona germari distribution.
出处
《河北林果研究》
1997年第2期151-155,共5页
Hebei Journal of Forestry and Orchard Research
关键词
桑天牛
分布区
阈值
温度
湿度
Apriona germari,distribution areas
threshold of temperature and humidity
