论文部分内容阅读
林木之间的竞争包括地上和地下两部分 .竞争影响空间的确定对预测生长有重要的意义 .本研究将竞争影响空间划分为两部分 :距对象木最近的一圈 ,称为内圈 ,包括地上和地下竞争影响 ;除最近一圈以外称为外圈 ,主要为地下竞争影响 .在此基础上将竞争指数分解为不同的竞争指数分量 .并以水曲柳和落叶松纯林和混交林为例 ,定量地分析了竞争影响空间内地上竞争和地下竞争 ,种内和种间竞争影响大小 .结果表明 ,纯林中两树体最近一圈内地上和地下竞争影响大于外圈的地下竞争影响 .在混交林中 ,对水曲柳来自种内竞争影响小于种间竞争影响 ,对落叶松种内竞争影响明显大于种间竞争影响 .此外 ,水曲柳以来自外圈种内的地下竞争影响为主 ,落叶松以来自内圈的地上和地下竞争影响为主 .水曲柳与落叶松混交可明显减轻水曲柳种内的竞争压力 ,落叶松可保持正常生长 .
The competition between trees includes above and below ground.The determination of competitive space is of great significance to the prediction of growth.In this study, the space of competitive influence is divided into two parts: the nearest circle to the target wood, called the inner circle, including Aboveground and underground competition. The outer circle, except for the nearest circle, is mainly influenced by underground competition. Based on this, the competition index is decomposed into different competition index components. As an example, this paper quantitatively analyzed the effects of competition on the ground and subsurface competition, intraspecific and interspecific competition in the competition-affected space.The results showed that the impact of competition on the ground and underground between the two trees in pure forest in the last circle was greater than that in the outer circle In mixed forest, the effect of interspecific competition on Fraxinus mandshurica is less than that on interspecific competition, and the impact on intraspecific competition is obviously greater than that on interspecific competition.In addition, Fraxinus mandshurica The main influence of larch on the ground from the inner ring and underground competition dominated the mixture of ash and larch can significantly reduce the pressure of competition within the species of larch, Normal growth.