林分内竞争对林木胸径生长量的影响研究

Effect of Intra-stand Competition on Tree DBH Growth

以广西来宾灰木莲阔叶林、杉木针叶林分作为研究对象,分别以树冠竞争指数、Hegyi简单竞争指数作为因变量,3 a内胸径增长量作为自变量,研究林分内林木竞争对单木胸径生长量的影响。结果表明,林木胸径增长量与竞争指数均为负相关,表明林木受到的竞争越大,林木的胸径增长量就越小;作为阔叶树种的灰木莲胸径的增长量比针叶树杉木更容易受到林木树冠竞争的影响;相对于Hegyi简单竞争指数,树冠竞争指数更能说明林木胸径增长量与林木竞争程度的关系。

Based on the research objects of Magnoliaceae glanca broad-leaved forest and Cunninghamia lanceolata coniferous forest in Laibin of Guangxi,the effects of forest competition on DBH growth of single tree were studied with crown competition index and Hegyi simple competition index as the dependent variables,and DBH growth within 3 years as the independent variable.The results showed that the DBH growth was negatively correlated with the competition index,indicating that the greater the competition of trees,the smaller the DBH growth;the DBH growth of the broad-leaved species was more susceptible to crown competition than that of the coniferous species;compared with Hegyi simple competition index,crown competition index could better explain the relationship between tree DBH growth and tree competition degree.