期刊
JOURNAL OF PLANT ECOLOGY
卷 12, 期 5, 页码 882-893出版社
OXFORD UNIV PRESS
DOI: 10.1093/jpe/rtz026
关键词
BEF-China; diversity; fine-root biomass; leaf-litter biomass; soil carbon accumulation
资金
- National Natural Science Foundation of China [31270496, 31300353]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA 05050204]
- University Research Priority Program Global Change and Biodiversity of the University of Zurich
Aims Tree species richness has been reported to have positive effects on aboveground biomass and productivity, but little is known about its effects on soil organic carbon (SOC) accumulation. Methods To close this gap, we made use of a large biodiversity-ecosystem functioning experiment in subtropical China (BEF-China) and tested whether tree species richness enhanced SOC accumulation. In 2010 and 2015, vertically layered soil samples were taken to a depth of 30 cm from 57 plots ranging in tree species richness from one to eight species. Least squares-based linear models and analysis of variance were used to investigate tree diversity effects. Structural equation modeling was used to explore hypothesized indirect relationships between tree species richness, leaf-litter biomass, leaf-litter carbon content, fine-root biomass and SOC accumulation. Important Findings Overall, SOC content decreased by 5.7 and 1.1 g C kg(-1) in the top 0-5 and 5-10 cm soil depth, respectively, but increased by 1.0 and 1.5 g C kg(-1) in the deeper 10-20 and 20-30 cm soil depth, respectively. Converting SOC content to SOC stocks using measures of soil bulk density showed that tree species richness did enhance SOC accumulation in the different soil depths. These effects could only to some extent be explained by leaf-litter biomass and not by fine-root biomass. Our findings suggest that carbon storage in new forests in China could be increased by planting more diverse stands, with the potential to contribute to mitigation of climate warming.
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