Temperature Sensitivity in Individual Components of Ecosystem Respiration Increases along the vertical gradient of Leaf–stem–soil in Three Subtropical Forests

编号 010022601

推送时间 20200217

研究领域 森林生态 

年份 2020 

类型 期刊 

语种 英语

标题 Temperature Sensitivity in Individual Components of Ecosystem Respiration Increases along the vertical gradient of Leaf–stem–soil in Three Subtropical Forests

来源期刊 forest

期 第226期

发表时间 20200125

关键词 climate change;  leaf respiration;  Q10;  soil respiration;  stem respiration;  temperature acclimation; 

摘要 Temperature sensitivity (Q10) of ecosystem respiration (ER) is a crucial parameter for predicting the fate of CO2 in terrestrial ecosystems under global warming. Most studies focus their attention in the variation of Q10 in one or two components of ER, but not in the integration or comparison among Q10 in major components of ER. Vertical and seasonal variations in individual components, including leaf respiration, stem respiration and soil respiration, of ER were observed synchronously along the gradient of leaf–stem–soil over a 2 year period in three forest stands dominated by masson pine, loblolly pine and oak, respectively, in a subtropical forest ecosystem of central China. We found that Q10 in individual components of ER increased along the vertical gradient of leaf–stem–soil. The vertical pattern of Q10 in individual components of ER was ascribed to variations of diurnal temperature range (DTR) and activation energy (ΔHa). These results suggest that a vertical pattern of Q10 in individual components of ER along the gradient of leaf–stem–soil should be taken into consideration in process-based models that simulate respiratory carbon flux in terrestrial ecosystems.

服务人员 王璐

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