阔叶红松林物种多样性变化对土壤性质的影响

Influence of Species Diversity on the Soil Properties of Broadleaved Korean Pine Forest

以小兴安岭五营林区的阔叶红松林为主要研究对象,对阔叶红松林及其次生类型结构特征和动态变化进行分析,研究小兴安岭红松原始林、红松人工林和次生林的土壤理化性质及物种多样性变化,并用逐步多元回归分析法分析12种土壤理化指标对多样性变化的响应。研究结果表明:由于原始林、人工林和次生林中乔、灌、草各层物种组成不同、数量不同,土壤理化性质也存在很大差异,不同土壤理化性质对物种多样性变化的响应不尽相同。建立5项指标与物种多样性的相关数学模型,其余7项指标与多样性指数没有直接的线性关系。本文通过对比试验揭示因物种多样性的减少而导致的土壤理化性质退化,阐明主要的影响因素及研究结果的生态学意义。

With Wuying forest region of Xiaoxing＇an Mountain as the main research object,the structure characteristics and dynamic variation of broad-leaved korean pine forest and its secondary forest were analyzed to study the variation of soil physical properties,chemical properties and species diversity of the virgin forest,planted forest and secondary forest in Xiaoxing＇an Mountain.The response of 12 physical and chemical indexes to the variation of diversity was discussed by multiple stepwise regression analysis in this paper.The results showed that：there is significant difference of the soil physical-chemical properties because of the different composition in each layer of trees,shrubs,and herb of the virgin forest,planted forest and secondary forest,and the response of different soil physical-chemical properties to the species diversity was not completely the same.Through the study,the related mathematical model between the 5 indices above and species diversity was established.However,there is no direct linear relationship between the other 7 indices with the diversity index.This paper revealed that it was the species diversity that results in the difference of soil physical-chemical properties.And it also clarified the ecological significance of the main influence factors and research results.