蒋华 梁乃鹏 吴宏扬

摘要 为了探讨间伐和施肥措施对杉木中龄林生长的影响程度，对实施不同间伐强度和施肥处理后3年的杉木生长效果调查研究。结果表明，间伐强度对杉木生长有一定的影响。杉木林分平均胸径和平均单株材积均随间伐强度的增大而呈现出增加的趨势;间伐强度对平均树高的影响不显著;林分蓄积量随着间伐强度的增大而呈现递减的趋势;随着间伐强度的增大，径阶分布逐渐偏离正态分布曲线而向右偏移，即大径阶所占株数百分比呈现逐渐增多的趋势，而小径级所占总株数百分比表现趋于下降。施肥试验结果表明，氮肥对杉木生长的促进作用不显著，而磷肥对杉木生长的促进作用随着施肥量的增加作用显著，建议在红壤的立地条件下多施用磷肥。

关键词 杉木;间伐强度;施肥;生长

中图分类号 S791.27文献标识码 A

文章编号 0517-6611（2021）02-0087-04

doi：10.3969/j.issn.0517-6611.2021.02.025

开放科学（资源服务）标识码（OSID）：

Effect of Thinning Intensity and Fertilization on the Growth of Middle Aged Chinese Fir Forest

JIANG Hua，LIANG Naipeng，WU Hongyang （Guangxi Stateowned Weidu Forest Farm，Laibin，Guangxi 546100）

Abstract In order to study the effect of thinning and fertilization on the growth of middle aged Chinese fir forest，the effect of thinning intensity and fertilization on the growth of Chinese fir was investigated.The results showed that thinning intensity had a certain effect on the growth of Chinese fir.The average DBH and volume per tree of Chinese fir stand increased with thinning intensity.The effect of thinning intensity on average tree height was not significant.The stand volume decreased with the thinning intensity increasing.With the increase of thinning intensity，the diameter distribution gradually deviated from the normal distribution curve and shifted to the right，that is to say，the percentage of large diameter class in the total number of trees showed a trend of increasing，while the percentage of small diameter class in the total number of trees showed a trend of decreasing.The results of fertilization experiment showed that the effect of nitrogen fertilizer on the growth of Chinese fir was not significant，while the effect of phosphorus fertilizer on the growth of Chinese fir was significant with the increase of fertilization.It was suggested that more phosphorus fertilizer should be used in the red soil.

Key words Cunninghamia lanceolate;Thinning intensity;Fertilization;Growth

杉木（Cunninghamia lanceolate）是我国南方重要的用材树种，杉木经营管理和培育是其可持续发展的重要环节，树种间伐和施肥是促进林分生长、缩短培育周期的重要的森林经营措施;间伐是调节林分内部竞争、促进林木生长、缩短轮伐期的重要经营措施，适度间伐可以降低轮伐期内林木单株因竞争造成的死亡，而施肥可以弥补因间伐所造成的林分蓄积损失，两者结合更有利于大径材的高效培育。

当前，国内外对红柳桉（Eucalyptus marginata）[1]、亮果桉（E.nitens）[2]、美国黑松（Pinus cintorta）[3-5]和樟子松（Pinus cintorta）[6]等树种相继开展了间伐、施肥等综合效应的研究，均表明林木生长受间伐和施肥的影响显著，但其影响程度因立地条件、间伐强度、施肥量等的不同存在差异。……