GSTDTAP  > 气候变化
DOI10.1111/gcb.15088
Traits mediate drought effects on wood carbon fluxes
Zhenhong Hu; Han Y. H. Chen; Chao Yue; Xiao Ying Gong; Junjiong Shao; Guiyao Zhou; Jiawei Wang; Minhuang Wang; Jianyang Xia; Yongtao Li; Xuhui Zhou; Sean T. Michaletz
2020-04-13
发表期刊Global Change Biology
出版年2020
英文摘要

CO2 fluxes from wood decomposition represent an important source of carbon from forest ecosystems to the atmosphere, which are determined by both wood traits and climate influencing the metabolic rates of decomposers. Previous studies have quantified the effects of moisture and temperature on wood decomposition, but these effects were not separated from the potential influence of wood traits. Indeed, it is not well understood how traits and climate interact to influence wood CO2 fluxes. Here, we examined the responses of CO2 fluxes from dead wood with different traits (angiosperm and gymnosperm) to 0%, 35%, and 70% rainfall reduction across seasonal temperature gradients. Our results showed that drought significantly decreased wood CO2 fluxes, but its effects varied with both taxonomical group and drought intensity. Drought‐induced reduction in wood CO2 fluxes was larger in angiosperms than gymnosperms for the 35% rainfall reduction treatment, but there was no significant difference between these groups for the 70% reduction treatment. This is because wood nitrogen density and carbon quality were significantly higher in angiosperms than gymnosperms, yielding a higher moisture sensitivity of wood decomposition. These findings were demonstrated by a significant positive interaction effect between wood nitrogen and moisture on CO2 fluxes in a structural equation model. Additionally, we ascertained that a constant temperature sensitivity of CO2 fluxes was independent of wood traits and consistent with previous estimates for extracellular enzyme kinetics. Our results highlight the key role of wood traits in regulating drought responses of wood carbon fluxes. Given that both climate and forest management might extensively modify taxonomic compositions in the future, it is critical for carbon cycle models to account for such interactions between wood traits and climate in driving dynamics of wood decomposition.

领域气候变化 ; 资源环境
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/248977
专题气候变化
资源环境科学
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GB/T 7714
Zhenhong Hu,Han Y. H. Chen,Chao Yue,et al. Traits mediate drought effects on wood carbon fluxes[J]. Global Change Biology,2020.
APA Zhenhong Hu.,Han Y. H. Chen.,Chao Yue.,Xiao Ying Gong.,Junjiong Shao.,...&Sean T. Michaletz.(2020).Traits mediate drought effects on wood carbon fluxes.Global Change Biology.
MLA Zhenhong Hu,et al."Traits mediate drought effects on wood carbon fluxes".Global Change Biology (2020).
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