河口县立地条件对柚木生长影响的调查研究

选择河口县马场等3个造林地块，从海拔100-800m共设置标准地20块、样方20块，调查不同立地条件对柚木生长的影响。结果为海拔400m以下为柚木最适宜区，400-600m为适宜区，600-800m为次适宜区；坡脚好于坡腹，坡腹好于坡顶；背风山坳、坡麓、沟谷、平地优于迎风坡及坡顶；土壤厚度大于80cm则柚木生长良好，低于50cm则生长不良；以马鹿草为主的植被群落有利于柚木生长，而以白茅为主的植被群落对柚木生长极为不利。

Study on Impact of Site Conditions of Hekou County on the Growth of Tectona grandis

Three plots of land for regeneration in Hekou county is chosen and 20 plots of standard land and 20 sampling plots are set up between the elevation of 100-800m. The inventory of different site conditions' impact on the growth of Tectona grandis indicates the land below the elevation of 400m as most favorable area, 400-800m as favorable area, 600-800m as less favorable area for the growth; and toe superior to the middle and the middle prior to the top of slope; the soil thickness higher than 80cm is better than the thickness lower than 50cm for the growth; and some vegetation communities are beneficial to the growth, some quite not.