【摘要】 <正> 马尾松是本省分布面积最广、蓄积量最多的用材兼采脂树种。黔中各县(市)是马尾松实生苗造林的主要经营区。本区系贵州高原的主体,海拔1000—1400米。本区气候温暖湿润,年均温14.4—16.8℃,大于10℃,积温4300—4700℃。一月均温4.1—8℃,七月均温23.4—25.3℃。年降水量1184—1408毫米。海拔1300米以上的山地因气温较低,冬春常有雨凇危害,致使马尾松断梢而生长不良。本区山地出露岩石以各种砂岩、砂页岩、白云岩、石灰岩为主,低丘盆地间有厚层红色粘土分布。由于马尾松有适应性强、生长快、造林容易等特点,所以本区各国营及社队林场都把它作为当家树种经营。六十年代营造的马尾松矿柱林先后开始间伐利用。然而由于立地条件不同,在林木生长发育和生产力方面存在着明显差异。本区林业经济条件优越,有集约经营的要求,因而评定林分和立地质量等级已成为提高经营水平的重要问题。马尾松(人工)立地更多还原

【Abstract】 We made an investigation on Massons’s pine （pinus inassoniana） plantations which are distributed over 23 forestry stations belonging to 13 counties （cities） in Central Area of Guizhou. 134 pieces of sample plots have been set up altogether. In each plot Three dominent trees were surveyed according to its annual heights and factors of habitat such as parent rock, topography, soil, etc. The site index table was established by adopting the model: logH=a+b（1/（A+K））, The quantification site index table was settied by adopting the model Theory I of quantification: Y_i=sum from i=1 to m sum from k=1 to r_i δ_i（j,k）b_jk+e_i using the following factors as items of regression equation: altitude, parent rock, thickness of humus layer, position slope, gravel content of soil, etc. Both the tables are precise to a higher degree, and can be tried for use in production.更多还原