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The Influences of Canopy Species and Topographic Variables on Understory Species Diversity and Composition in Coniferous Forests

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Hong Huo, Qi Feng, Yong-hong Su. The influences of canopy species and topographic variables on understory species diversity and composition in Coniferous Forests. The Scientific Word Journal, 2014, http://dx.doi.org/10.1155/2014/252489

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Type Of Reference JOUR
Title The Influences of Canopy Species and Topographic Variables on Understory Species Diversity and Composition in Coniferous Forests
Authors Huo, Hong| Feng, Qi| Su, Yong-hong|
Secondary Title The Scientific World Journal
Abstract Understanding the factors that influence the distribution of understory vegetation is important for biological conservation and forest management. We compared understory species composition by multi-response permutation procedure and indicator species analysis between plots dominated by Qinghai spruce (Picea crassifolia Kom.) and Qilian juniper (Sabina przewalskii Kom.) in coniferous forests of the Qilian Mountains, northwestern China. Understory species composition differed markedly between the forest types. Many heliophilous species were significantly associated with juniper forest, while only one species was indicative of spruce forest. Using constrained ordination and the variation partitioning model, we quantitatively assessed the relative effects of two sets of explanatory variables on understory species composition. The results showed that topographic variables had higher explanatory power than did site conditions for understory plant distributions. However, a large amount of the variation in understory species composition remained unexplained. Forward selection revealed that understory species distributions were primarily affected by elevation and aspect. Juniper forest had higher species richness and α-diversity and lower β-diversity in the herb layer of the understory plant community than spruce forest, suggesting that the former may be more important in maintaining understory biodiversity and community stability in alpine coniferous forest ecosystems.
Date 2014/07/06/
Year 2014
DOI 10.1155/2014/252489
Database Provider www.hindawi.com
volume 2014
Language en
Issn 2356-6140
Url http://www.hindawi.com/journals/tswj/2014/252489/abs/
Access Date 2014/12/26/09:17:42
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