文献类型：期刊文献

英文题名：Estimation of the self-thinning boundary line within even-aged Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) stands: Onset of self-thinning

作者：Sun, Honggang[2] Zhang, Jianguo[1] Duan, Aiguo[1] He, Caiyun[1]

第一作者：孙洪刚

通信作者：Zhang, JG[1]

机构：[1]Chinese Acad Forestry, Inst Forestry Res, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Inst Subtrop Forestry Res, Fuyang 311400, Zhejiang, Peoples R China

年份：2011

卷号：261

期号：6

起止页码：1010-1015

外文期刊名：FOREST ECOLOGY AND MANAGEMENT

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000288193700008)】；

基金：This study was supported by the 11th Five-Year Plan of the National Scientific and Technological Support Projects the National Natural Science of China (Grant No. 2006BAD24B03).

语种：英文

外文关键词：Cunninghamia lanceolata (Lamb.) Hook.; Stand density; Average stem volume; Onset of self-thinning; Crown closure

摘要：The trajectory of self-thinning was studied using data from Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) stands measured 17 times over 26 years to elucidate the relationship between the maximum average stem volume (dm(3)) and the stand density (stems/ha). The study examined five initial density levels (2 m x 3 m, 2 m x 1.5 m, 2 m x 1 m, 1 m x 1.5 m, and 1 m x 1 m) with three replications at each level, but only 10 plots were used in the final analysis. Subsets of the data were constructed using 0-67%, 2-67%, 5-67%, 10-67%, 15-67%, 20-67%, 23-67%, 25-67% and 30-67% mortality rate classes. Ordinary least squares and reduced major axis (RMA) regression techniques were employed to obtain self-thinning parameters for each mortality rate class subset. The RMA method combined with jackknife estimation (RMA + jackknife) was the most appropriate regression method based on standard error estimations. The self-thinning exponent with a mortality rate class of 2-67% adequately represented the maximum volume-density relationship. The self-thinning exponents changed systematically with the mortality rate classes, and -1.5 was a transitory value in the course of self-thinning. It is also concluded that self-thinning in closed Chinese fir stands may occur when the ratio of the live crown length to tree height approaches 0.3. (C) 2010 Elsevier B.V. All rights reserved.