作    者：王江，于飞海
影响因子：2.658
刊物名称：Journal of Vegetation Science
出版年卷：2018;29:726–736.

文章摘要：Questions Does functional diversity play a more important role than species richness in complementary resource use? Is the effect of functional diversity on complementarity greater when species evenness is higher? Does functional dominance play an important role in resource use when species evenness is low?. Location An arable field in Linhai City, Zhejiang Province, China (121°53′26.26″E, 28°09′51.13″N). Methods We assembled experimental plant communities with different species richness (1, 2, 4, 8 and 12 species) and evenness (low and high). In each community, we quantified light interception efficiency (LIE) and light complementarity index (LC) to reflect light use. We measured four functional traits related to light capture to quantify functional diversity and functional dominance. We then tested effects of observed species richness, functional diversity and functional dominance on LIE, LC and aboveground biomass in the low and high evenness communities. Results Functional diversity was positively related to LIE, LC and aboveground biomass in the high evenness communities, but not in the low evenness communities. By contrast, functional dominance was positively related to LIE and negatively related to LC in the low evenness communities, but not in the high evenness communities. Moreover, functional dominance had a greater promotion to aboveground biomass in the low evenness communities. Observed species richness and evenness had a significant interactive effect on LIE and LC. LIE of a species mixture of the low evenness communities was positively correlated with LIE of the monoculture consisting of the species with the greatest initial abundance in the species mixture, while LC of a species mixture of the low evenness communities was negatively correlated with it. Conclusions Functional diversity and functional dominance play a crucial role in light complementary use of plant communities, and their effects on light complementary are mediated by species evenness. Thus, interactions of functional traits and evenness may greatly affect ecosystem functioning. This article is protected by copyright. All rights reserved.
 

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