Volume 13, Issue 3 (10-2019)
مرتع 2019, 13(3): 504-521 |
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Omidipour R, Ebrahimi A, Tahmasbi P, Faramarzi M. The relationship between functional richness, evenness and divergence and ecosystem functioning in a cold steppe rangeland of Marjan, Boroujen. مرتع 2019; 13 (3) :504-521
URL: http://rangelandsrm.ir/article-1-788-en.html
URL: http://rangelandsrm.ir/article-1-788-en.html
Department of Range Mamnagement, Faculty of Natural Resources and Earth Science, University of Shahrekord, Shahrekord
Abstract: (4765 Views)
Effective conservation of ecosystem services and its functions depend on the biodiversity. Due to the multidimensionality of biodiversity, using multi approaches of biodiversity measurement is vital to assess the relationship between biodiversity and ecosystem functioning. Therefore, in the current study, the relationship between different indices of species diversity (species richness, evenness, Shannon and Simpson diversity) and functional diversity of single trait-based and multiple trait-based (functional richness, evenness, divergence and functional Rao diversity) with ecosystem aboveground biomass (AGB) tested based on two hypotheses of mass ratio (selection effects) and niche complementarity in cold steppe rangeland in Chaharmahal-Va-Bakhtiari province. To quantify the functional diversity indices, several functional traits associated with AGB including specific leaf area, plant height, leaf area, leaf length, leaf dry weight, mean crown diameter, leaf nitrogen content, leaf phosphorus content, leaf chlorophyll content, and leaf dry matter content were sampled in 63 quadrats 2m × 2m in 2016. The relationship between different biodiversity indices and AGB was investigated using single and multiple linear regression analysis. The results showed that AGB was significantly and positively related to Shannon (R2= 0.63), Simpson (R2= 0.49), and species richness (R2= 0.67) diversity indices. Functional divergence and functional richness had significant positive and negative relation to AGB (R2= 0.38, and R2= 0.33) respectively. Also, most single traits-based indices are negatively associated with AGB. The results of multiple linear regression indicated that a combination of all species diversity indices, single based-traits functional diversity indices, and multiple traits-based functional diversity indices could predict about 67, 55, and 52 percent of AGB variation. The results suggested that using different approaches of biodiversity measurement can provide a better insight in to the ecosystem AGB. Therefore, biodiversity conservation is essential for the sustainable management of ecosystem services and functions. The results also pointed out that the relationship between biodiversity and AGB could explained by both mass ratio and niche complementarity hypotheses that increase in identity of dominant species and niche differentiation among species resulted in more efficient acquisition of limiting resources and higher ecosystem AGB.
Type of Study: Research |
Subject:
Special
Received: 2019/10/21 | Accepted: 2019/10/21 | Published: 2019/10/21
Received: 2019/10/21 | Accepted: 2019/10/21 | Published: 2019/10/21
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