摘要
以红松针阔混交林样地(200 m×140 m)为研究区,采用角尺度、混交度和大小比数3个指标对倒木出现前后的林分空间结构进行量化分析。结果表明:样地内倒木比例占7.15%,且中等径木居多,倒木数量与该树种立木多度呈极显著正相关(r=0.816,P=0);从倒木存在形式看,倒木数量为连根拔起>根倒>干折,倒木数量的差异与立地条件、树木生长特性密切相关;倒木使林分整体的混交度增大,角尺度和大小比数减小,但由非参数检验得知差异并不显著;倒木对不同树种空间结构的影响呈现出一定规律性,树种平均混交度的增量与其倒木比例呈极显著正相关(r=0.715,P=0.002),平均大小比数的增量与该树种倒木平均胸径呈显著正相关(r=0.579,P=0.024),与倒木和立木的平均胸径之比呈极显著正相关(r=0.806,P=0)。
With a 200 m× 140 m sample plot of coniferous-broad leaved Korean pine mixed forest, we measured three indexes including uniform angle index, mingling and neighborhood comparison to quantitatively analyze the change of spatial structure in the forest before and after tree falling down. There were 7.15% of standing trees falling in the plot, and the medium- thick ones were in the majority. There was a very significant positive correlation between the number of different specie fallen trees and their relative abundance （r = 0. 816, P = 0）. The number of fallen trees in descending order was uprooting, root-break, and stem-break, and thc difference mainly resulted from site comlition and characteristics of tree growth. Falling trees increased the mingling and reduced the unifonn angle index and neighborhood comparison in the forest, but there was no significant variation statistically, There was a high significant positive correlation between different specie increment of mean mingling and the percentage of fallen tree,; （r=0.715, P= 0.002）. Different specie increment of mean neighbor- hood had a significant positive correlation with mean DBH （r= 0.579, P= 0.024） of the fallen tree, and had a high significantly positive correlation with the fallen-to-stand ratio of mean DBH （ r= 0.806, P = 0）.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2015年第7期1-6,共6页
Journal of Northeast Forestry University
基金
中央高校基本科研业务费专项资金资助(2572014AB05)
林业公益性行业科研专项(200904022)
关键词
倒木
红松针阔混交林
角尺度
混交度
大小比数
平均胸径
Fallen tree
Coniterous-broad leaved Korean pine mixed forest
Angle index
Mingling
Neighborhood comparison
The mean DBH
