抚育间伐对成熟期杉木人工纯林生长量的影响

为解决成熟期的杉木Cunninghamia lanceolata生长受抑制问题, 选择生态疏伐、卫生伐等2种处理对成熟期的杉木人工纯林进行抚育间伐, 运用方差分析的方法, 对60块标准地中杉木生长量的试验数据进行比较分析。结果表明:生态疏伐、卫生伐与对照比较, 树高因子生长影响不显著(P>0.05), 而胸径、单株材积因子生长影响均达到极显著差异(P<0.01), 且生态疏伐的影响较卫生伐影响大。由此可见, 给成熟期的杉木人工纯林以足够的生长空间, 虽然对林分树高因子生长没有影响, 却能有效地促进林木胸径生长, 增加单株材积, 获得更多优质、高产、高效的木材, 提高单位面积的生态效益和经济效益。

Growth with intermediate cuttings in mature Chinese fir plantations

To solve the problem of inhibited growth in mature Chinese fir （Cunninghamia lanceolata） plantations, an analysis of variance for two different tending methods（ecological thinning and sanitation cutting）on growth for 60 blocks of standard Chinese fir forest plots was conducted. Results showed that compared to the control, ecological thinning and sanitation cutting significantly increased diameter at breast height （DBH） and individual growth volume （P＜0.01）, but not height growth （P＞0.05）. And judging by the statistics，the influence of ecological thinning was greater than sanitation cutting. Although providing more space for Chinese fir had no effect on height growth, DBH and individual volume increases were conducive to cultivation of large diameter Chinese fir timber which raised ecological performance and the economic benefits per unit area. ［Ch, 3 tab. 12 ref.］