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Nonadditive and Legacy Effects of Spring and Autumn Warming on Soil Respiration in an Old-Field Grassland
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Nonadditive and Legacy Effects of Spring and Autumn Warming on Soil Respiration in an Old-Field Grassland
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Journal Article
Nonadditive and Legacy Effects of Spring and Autumn Warming on Soil Respiration in an Old-Field Grassland
2021
Overview
Asymmetrically seasonal warming has been widely observed on the Earth, but great uncertainties remain for its effects on terrestrial carbon (C) cycling. As a part of a 7-year seasonal warming experiment in an old-field grassland in Central China, this study demonstrated that spring and autumn warming reduced soil respiration by 8.3% and 9.8%, respectively. In addition, spring warming decreased soil respiration by 1.0% and 15.9% without and with autumn warming, respectively. Autumn warming suppressed soil respiration by 2.5% and 17.2% without and with spring warming, respectively. Decreased soil respiration in summer under both spring and autumn warming dominated the treatment-induced suppressions in annual mean soil respiration, which could be primarily attributable to the reductions in plant photosynthesis and growth (aboveground net primary productivity). These observations suggest that the asymmetrically seasonal warming may diminish soil C loss and its feedback to climate warming. Our findings highlight the urgent need of incorporating the interactive and legacy effects of seasonal warming into models used in the IPCC reports for the robust projections of future climate change.
Publisher
Springer Science + Business Media,Springer US,Springer,Springer Nature B.V
Subject
