河口县立地条件对柚木生长影响的调查研究

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

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。

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.