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  • The intra- and inter-annual responses of soil respiration to climate extremes in a semiarid grassland

    Author(s)
    Li, Linfeng
    Qian, Ruyan
    Wang, Weijin
    Kang, Xiaoming
    Ran, Qinwei
    Zheng, Zhenzhen
    Zhang, Biao
    Xu, Cong
    Che, Rongxiao
    Dong, Junfu
    Xu, Zhihong
    Cui, Xiaoyong
    Hao, Yanbin
    Wang, Yanfen
    Griffith University Author(s)
    Xu, Zhihong
    Year published
    2020
    Metadata
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    Abstract
    Increasing frequency and magnitude of climate extremes could fundamentally affect terrestrial carbon (C) cycling. However, as the second-largest terrestrial C flux, soil respiration (SR) responses to climate extremes are not well understood. Here, we investigated the effects of drought, heat wave and drought plus heat wave on SR in a semiarid grassland during the growing season over 3 years. The results indicated that drought consistently reduced the growing-season mean SR, especially during the period of drought treatment, while heat wave, alone or when combined with drought, had little effect on SR. The decreased SR under ...
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    Increasing frequency and magnitude of climate extremes could fundamentally affect terrestrial carbon (C) cycling. However, as the second-largest terrestrial C flux, soil respiration (SR) responses to climate extremes are not well understood. Here, we investigated the effects of drought, heat wave and drought plus heat wave on SR in a semiarid grassland during the growing season over 3 years. The results indicated that drought consistently reduced the growing-season mean SR, especially during the period of drought treatment, while heat wave, alone or when combined with drought, had little effect on SR. The decreased SR under drought at the intra-annual timescale could be primarily attributable to restriction of low soil moisture to microbial biomass, as there were no consistent changes in plant community (aboveground biomass, richness and abundance). In contrast, the inter-annual variation in SR was positively related to plant community abundance, richness and aboveground biomass in additional to soil water availability, but was not significantly affected by microbial biomass. Our study highlighted that incorporating microbial biomass in C cycling models can improve simulation of seasonal dynamics of soil respiration while incorporating plant community characteristics can benefit prediction of variation in SR across multiple years in semiarid grasslands.
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    Journal Title
    Geoderma
    Volume
    378
    DOI
    https://doi.org/10.1016/j.geoderma.2020.114629
    Subject
    Environmental sciences
    Biological sciences
    Agricultural, veterinary and food sciences
    Science & Technology
    Life Sciences & Biomedicine
    Soil Science
    Agriculture
    Carbon cycling
    Publication URI
    http://hdl.handle.net/10072/397874
    Collection
    • Journal articles

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