关键词: 海拔高, 热量指标, 滇南, 西南区, 中南区, 云南南部, 最热月, 热带, 持续期, 积温

Abstract: The southern part of Yurman Province may be divided into three climatic zones:(1) tropical SW monsoon humid climatic zone (2) tropical SE monsoon humid climaticzone and (3) tropical central dry climatic zone, according to the general circulation ofthe atmosphere and topography. The eharateristics of thermal-moisture regimes of eachzones are quite different from one another, and the division lines of these three climaticzones are quite distinct and stable from year to year.The thermal regime of each of the above zone is mainly determined by the altitudeabove the sea level. As the data of meteorological stations located at valleys or basins.at different altitudes and different latitudes are analysed, six thermal belts can be drawnout which may be called the vertical-horizontal thermal belts. The division of these beltsshows both the characters of vertical spectrum and of horizontal zonality.The multiple varieties of climates corresponding to different altitudes in tropicalsouthern Yunnan are favourable in forming a rich and diversified biological resources,and production of tropical and subtropical crops.The system and classification of the climatic regioualization are proposed by theauthors as follows.0 grade: three climatic zone as mentioned above1st grade, six vertical-horizontal climatic belt2nd grade, sub-division according to moisture index3rd grade, sub-division according to overwintering conditions of vegetation.