沙地云杉林天然更新格局及其影响因子的灰关联分析

为了揭示沙地云杉种群发生、发展的内在机制,寻找影响沙地云杉林天然更新的瓶颈因子,应用格局分析和灰关联分析的方法对内蒙古白音敖包国家级自然保护区沙地云杉林的天然更新格局及其主要影响因子进行了研究。结果表明:沙地云杉林天然更新幼苗、幼树呈聚集分布,且死亡率高;枯枝落叶层厚度、下木盖度以及腐殖质层厚度对沙地云杉林天然更新影响最大,其关联度分别达到了0.749,0.746和0.678;海拔高度和坡度的关联度分别为0.615,0.621,与天然更新的关联度最小,对天然更新影响较小。

Natural Regeneration Pattern and Grey Relevancy Analysis of Influencing Factors of Picea mongolica Forest in Inner Mongolia

In order to reveal the internal mechanism about the occurrence and development of Picea mongolica population,find and analyze the bottleneck factors of natural regeneration,the regeneration pattern and influencing factors of Picea mongolica forests in Baiyinaobao national nature reserve were researched qualitatively and quantitatively through spatial pattern and grey relevancy analysis method.The results showed that the regeneration seedlings and saplings took on a clumped distribution with a high mortality.The main factors that influence the natural regeneration were the litter layer thickness,coverage of shrubs and humus layer.The relevancy degree was 0.749,0.746 and 0.678 respectively.The altitude and slope degree had nearly no effect on the natural regeneration whose relevancy degree was only 0.615 and 0.621 respectively.