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为研究苗木更新与不同环境因子的相关关系,笔者以冬青为研究对象,对江苏省溧水林场内4块有一定代表性的天然次生林样地进行详细调查。在分析不同群落中冬青苗木的个体大小—密度分布特征的基础上,运用冗余分析(RDA)的方法对冬青苗木更新状况与种内、种间、土壤因子的相关关系进行研究。结果发现:随着群落中冬青重要值上升,冬青苗木由“高密度—小株型”的分布特征,逐渐转变为“低密度—大株型”状态。3类环境因子对冬青苗木更新总体表现为促进作用,但不同林层的林分结构因素间、以及不同种类的土壤因素间存在一定差异。不同类型群落中影响冬青苗木更新的主导因子不同。当冬青重要值较低时,种内因子和种间因子组成的林分结构因素是主要影响因素,土壤因子影响较小,此时种间作用主要体现于上层高大乔木的影响。当冬青重要值较低时,土壤因子的影响超过林分结构因素,此时林分结构的影响主要表现为较强的更新层种间作用。
In order to study the correlation between seedling renewal and different environmental factors, the author made a detailed investigation on four representative natural secondary forest plots in Lishui Forest Farm in Jiangsu Province. Based on the analysis of the individual size and density distribution characteristics of holly seedlings in different communities, the relationship between the regeneration status of seedlings and the intraspecific, interspecific and soil factors of Hollyhock was studied by using the redundancy analysis (RDA) method. The results showed that: With the increase of the important value of holly in the community, the seedling of Holly shoot changed gradually from “high density to small plant type” to “low density - large plant type”. There were some differences among the three types of environmental factors on the overall performance of the regeneration of seedlings of Hollyhock, but different stand structure factors and different soil factors in different forest layers. Different types of communities affect the holly seedlings update the dominant factor is different. When Hollyhock value is low, the stand structure factor of interspecies and interspecies is the main factor, and the effect of soil factor is small. At this time, the interspecific interaction is mainly reflected in the influence of the tall trees. When Hollyhock value is low, the influence of soil factors exceeds that of stand structure. At this time, the effect of stand structure is mainly manifested as the strong inter-species interaction of regeneration layer.