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本文调查了尼泊尔季节性干旱的娑罗双树原始林两种生态位(间隙和全郁闭)下树种多样性及苗木再生情况,并对物种多样性指标和苗木再生属性与林分间隙特征进行了相关性分析。结果表明,间隙生态位下乔木和灌木立木度高于全郁闭。间隙生态位下娑罗双树和榄仁树的幼苗密度也高于全郁闭,但是油榄仁和海南蒲桃的比较结果恰好相反。在幼苗层物种多样性指标(complement of Simpson index,Evenness index,and species-individual ratio)在间隙生态位要低于全郁闭条件。间隙大小能够解释物种丰富度和物种建立速率。多年多样伐木形成的林分间隙下娑罗双树幼苗密度要高于同一年内单一或多样伐木。结论:林分间隙的物种多样性通过增加幼苗密度来维持,并且适于娑罗双树再生。此外,林分间隙的其它属性也会影响物种多样性和苗木再生。
In this paper, we investigated the species diversity and regeneration of seedlings under two seasonal niche (Dracaena vicariae) forests in Nepalese Droughts in Nepalese, Nepal. Species diversity and seedling regeneration characteristics were correlated with stand gap characteristics Sexual analysis. The results showed that the standing wood degree of trees and shrubs in gap niche was higher than that in all canopy. Under the niche of niche, the seedling density of Rhodiola sibirica and Ulmus pumila was higher than that of Allium canola, but the comparison result of L. rugulis and Hainan rosea was just the opposite. The complement of Simpson index (Evenness index, and species-individual ratio) is lower than that of the full-closed condition at the gap niche. Gap size can explain species richness and species establishment rate. The density of seedlings of Rhododendron simonii under stand gap formed by years of diverse logging was higher than that of single or multiple logging in the same year. CONCLUSION: Species diversity in stand gap is maintained by increasing seedling density, and is suitable for regeneration of Rhizoma. In addition, other attributes of stand gaps can also affect species diversity and seedling regeneration.