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Cited 7 time in webofscience Cited 7 time in scopus
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Species evenness declines but specific functional strategy enhances aboveground biomass across strata in subtropical-Warm-temperate forests of South Korea

Authors
Lee, Hae-InSeo, Yeon-OkKim, HyeonghoAli, ArshadLee, Chang-BaeChung, Yeojin
Issue Date
15-May-2022
Publisher
Elsevier BV
Keywords
Forest strata; Functional strategies; Mass ratio; Niche complementarity; Stand age; Topography
Citation
Forest Ecology and Management, v.512
Indexed
SCIE
SCOPUS
Journal Title
Forest Ecology and Management
Volume
512
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/1269
DOI
10.1016/j.foreco.2022.120179
ISSN
0378-1127
1872-7042
Abstract
The relationships amongst environmental conditions, stand age, tree diversity, and trait identity with aboveground biomass (AGB) remain highly debated in forest ecosystems, but these relationships across forest strata (i. e., overstory and understory) remain poorly assessed in subtropical - warm-temperate forests. Here, we hypothesized that environmental conditions, stand age, tree diversity and trait identity jointly control AGB, but divergent species' functional strategies regulate AGB in different forest strata of subtropical - warm-temperate forests. To do so, we analyzed datasets from 72 plots across five sites in subtropical - warm-temperate forests of Jeju Island, South Korea. We used multimodel inference tests based on multiple linear regressions models and then piecewise structural equation modeling (pSEM) to assess the relationships amongst topographic factors, stand age, tree diversity (i.e., species, phylogenetic and functional diversity), and trait identity (i.e., communityweighted mean - CWM - of a trait values) and AGB in the overstory, understory, and whole community. The pSEMs showed that lower species evenness increased AGB in overstory and understory, but CWM of tree maximum height and seed mass enhanced overstory and understory AGB, respectively. Moreover, species evenness mediated the divergent effects of stand age and topography on overstory and understory AGB, respectively. This study shows that the effect of low species evenness on AGB is ubiquitous across forest strata, but divergent species' functional strategies also contribute to shaping AGB. We argue that species' functional strategies (i.e., the mass ratio effect) across forest strata and developmental stages should be taken into consideration for sustainable forest management to achieve the biodiversity conservation and carbon sequestration that underpins human wellbeing through climate change mitigation strategies.
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농업생명과학대학 (환경산림과학부)
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