植被的PE(可能蒸散)指标与植被-气候分类(二)——几种主要方法与PEP程序介绍

THE POTENTIAL EVAPOTRANSPIRATION(PE)INDEX FOR VEGETATION AND VEGETATION-CLIMATIC CLASSIFICATION(2)-AN INTRODUCTION OF MAIN METHODS AND PEP PROGRAM

应用C.W.Thorn thwaite计算PE与气候分类方法对我国671个气候台站资料计算分析结果,得出可能蒸散的地理回归模型为: APE=2037.98-18.8308LAT(纬度)-4.5801LONG(经度)-0.157861ALT(海拔) APE与湿度指数Im与我国植被的主要类型及其分布格局有密切相关性。其热量指标(APE)界限与北美颇相符合,但Im明显偏低,反映了中国植被的生态特点。研究表明该方法在我国有明显的应用前景。

Thornthwaite′s method on calculating PE and climatic classificationhas been applied on computing data from 671 climatological observationstations in China. A geographic regression model of potential evapotran-spiration is resulted as APE=2037. 98-18. 8308LAT-4.5801 LONG-0.157861ALT.The resulted APE and moisture index, Im are closely cor-related with the major vegetation types and their distribution pattern inChina. The bounds of thermal coefficient (APE) for the vegetation inChina fits in quite well with which in North America, but the Im is evi-dently lower than there. That just is a reflection of the ecological cha-racteristics for vegetation of China. The research makes known that themethod should have a broad prospect for application in the country.