不同抚育方式对杉木幼林生长与地力维持的效果分析

对杉木二代幼林采用３种抚育方式：①全面劈草；②全面劈草，局部松土除草；③全面松土除草。通过３年试验观测，结果表明：①和②方式比③方式植被覆盖度分别大２４．３％～４１．３％和２２．８％～３４．６％，表层土壤的侵蚀度下降５０．１％和４０．６％，Ａ０层覆盖率分别提高５７．１％和５４．７％；３种抚育方式对杉木幼林的树高和冠幅生长无显著差异，但对胸径生长有极显著差异；抚育效果以②方式最佳。

The Effect Analysis of Different Tending Modes on the Young Forest Growth and Soil Fertility Maintenance of Cunninghamia lanceolata

Three tending modes were adopted for the second-generation young forests of Cunninghamia lanceolata :1 Wholly chopping down weeds;2 wholly chopping down weeds with locally loosening the soil and weeding ;and 3 wholly loosening the soil and weeding Through the experimental observation for three years,the results reveal that as compared with the third mode,the vegetational coverage of the first two modes increases by 24 3～41 3% and 22 8～34 6% respectively,their surface-layer soil erosion degree reduces by50 1% and 40 6% respectively and their A 0-layer coverage increases by 57 1% and 54 7% respectively;three tending modes have no evident difference on the height and crown width growth of young forests of C.lanceolata ,but they have evident difference on the dbh growth;and the tending effect of the second mode is optimal.