子午岭油松林林隙更新特征研究

利用样地调查资料,以林下为对照,分析研究子午岭油松林的林隙更新特征,结果表明:1)子午岭油松林林隙内和林下更新树种在组成和数量上有较大差异,其中,油松在林隙内的重要值远远大于其在林下的重要值,是林隙更新的主要树种;2)油松幼苗幼树在林隙内生长良好,7年生以上的幼树在林下分布已很少,地径在1.0cm以上、高度在50cm以上的幼树数量分布在林隙内也远远大于林下,说明随着年龄的增长,油松幼苗幼树在林隙内存活的概率大于林下;3)方差分析表明,油松幼苗幼树在林隙内与林下的高度生长差异极为显著;4)相关性分析表明,林隙内油松幼苗幼树的更新数量与光照强度呈显著正相关,与植被总盖度呈显著负相关。

Study on Regeneration of Pinus tabulaeformis Forest Gaps in Ziwu Mountains

Based on field survey data,the regeneration characteristics of pinus tabulaeformis forest gaps in comparison with those tree species under canopies was investigated.The result showed that(1)There are obvious difference in the quality and composition of the regeneration trees,species in gaps and under canopies in Pinus tabulaeformis forest in Zi Wu Moutains,the important value of the Pinus tabulaeformis under forest gaps is superior to that under canopies,which is the major regeneration tree species in gaps.(2) There is better growth under forest gaps of seedlings and young trees of Pinus tabulaeformis.There are a few Pinus tabulaeformis saplings above 7 years old under canopies,the number distribution of saplings above 1.0cm in collar diameter and above 50cm in height in gaps is superior that under canopies too.It shows that the survival rate of pinus tabulaeformis seedlings and saplings in gaps is superior to that under canopies with age increasing.(3)Variance analysis showes that the height variance of pinus tabulaeformis has obvious difference between forest gaps and canopies.(4)Relationship analysis shows there is an obvious and positive relationship between the Pinus tabulaeformis seedlings numbers and illumination intensity,but a negative relationship between this and vegetation coverage.