不同坡位黧蒴人工林的生长差异分析

应用典型样地调查法对9a生不同坡位黧蒴（Castanopsis．fissa）人工林的生长进行综合分析，结果显示：不同坡位间的树高、胸径和单株材积均有极显著差异，下坡位林木生长最好。随着坡位上升，树高、胸径和单株材积3个指标均明显下降。下坡位的树高均值为9．78m，中坡和上坡位的树高均值分别比下坡位的减少21．98％和53．99％；下坡位的胸径均值为15．88cm，中坡和上坡位的胸径均值分别比下坡位的减少30．98％和65．99％；下坡位单株材积均值为0．1004m^3，而中坡和上坡位的单株材积均值分别比下坡位的下降59．76％和93．03％。不同坡位的冠幅、活枝下高和死枝下高有极显著差异。冠幅、枝下高等性状与树高和胸径呈极显著正相关。

Comparative analysis on the growth differences between slope positions in 9-year-old Castanopsis fissa plantations

The growth difference among slope positions were analyzed based on the investigation in 9 years old Castanopsis fissa plantations in Dongjiang Forest Farm in central of Guangdong Province. Comprehensive analysis showed that: there were significantly difference among different slope positions in trees hight, DBH and individual volume, and which was increased remarkably with the rising slope position. Trees hight, DBH and individual volume at downslope position was 1.4 times, 1.3 times, 2.5 times as high as which were at midslope, was 2.9 times, 2.2 times 15.0 times to which at upslope. Crown width and height under branch had significant differences among the slope positions, which increasing along slope rising, and which were significantly correlated with trees hight and DBH. According to this analysis, Castanopsis fissa is most suitable for planting at the downslope position, may be appropriate in planting at midslope, was unfavorable planting at upslope in studied area. Some guidances and suggestions for the Castanopsis fissa plantation site selection in study areas and the surrounding area with similar terrain features .