文献类型：期刊文献

英文题名：Relationship between size inequality and stand productivity is modified by self-thinning, age, site and planting density in Sassafras tzumu plantations in central China

作者：Sun, Honggang[1] Diao, Songfeng[2] Liu, Ru[3] Forrester, David[4] Soares, Alvaro[5] Saito, Dai[6] Dong, Ruxiang[1] Jiang, Jingmin[1]

第一作者：孙洪刚

通信作者：Jiang, JM[1]

机构：[1]Chinese Acad Forestry, Inst Subtrop Forestry Res, Beijing, Peoples R China;[2]Chinese Acad Forestry, Paulownia Res & Dev Ctr, State Forestry Adm, Nontimber Forestry Res & Dev Ctr, Beijing, Peoples R China;[3]Chinese Acad Forestry, Expt Ctr Subtrop Forestry, Beijing, Peoples R China;[4]Swiss Fed Inst Forest Snow & Landscape Res WSL, Lausanne, Switzerland;[5]Fed Rural Univ Amazon UFRA, Belem, Para, Brazil;[6]Univ Freiburg, Inst Silviculture, Freiburg, Germany

年份：2018

卷号：422

起止页码：199-206

外文期刊名：FOREST ECOLOGY AND MANAGEMENT

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000433653900021)】；

基金：We thank the Huangshan Forestry Teaching Farm and the Experimental Centre of Subtropical Forestry of Chinese Academy of Forestry for their long-term efforts in managing and investigating the permanent experimental plantations. This work was supported by Forestry Industry Research Special Funds for Public Welfare Projects (Grant no. 201404104) and the Central Research Institutes of Basic Research and Public Service Special Operations (CAFYBB2016ZX003-3). We would like to thank two anonymous reviewers for their very valuable comments.

语种：英文

外文关键词：Productivity

摘要：Greater size inequality has been associated with lower forest productivity. Density-dependent mortality can reduce size inequality and potentially modify relationships between size inequality and productivity. We examined the effect of density-dependent mortality, age, planting density and site quality on this relationship using two Sassafras tzurnu plantations in central China with three planting density levels (4.0 m x 5.0 m, 3.0 m x 4.0 m, and 2.0 m x 3.0 m) replicated at two sites. The stands were measured in winter every other year for 20 years, from 1996 to 2016. Generalized linear mixed effect models were used to examine the relationship between stand age, planting density, site quality, and size inequality (assessed using the Gini coefficient). Gini coefficients, and hence size inequality, increased with stand age, planting density and site quality. The onset of self-thinning reduced the rate at which size inequality increased. Productivity was negatively correlated with size inequality, and self-thinning modified this relationship such that productivity declined at a greater rate (with increasing size inequality) after self-thinning had begun to occur. The productivity-size inequality relationship was also modified by planting density, age and site quality, such that with all other things being equal, the negative effect of size inequality is greatest in young stands, dense stands and on low quality sites. The manipulation of stand size inequality (e.g. by thinning or mortality) influences growth more than simply by changing stand density. An understanding of the mechanisms driving the effect of density-dependent mortality on the relationship between productivity and size inequality may facilitate the further development of silvicultural regimes.