Antecedent water condition determines carbon exchange response to extreme precipitation events across global drylands

نویسندگان

چکیده

The global hydrological cycle is predicted to be intensified under the warming climate, with more extreme precipitation events and longer dry spell in between. Here, we evaluated how (EPEs) antecedent (dry-EPEs) wet (wet-EPEs) water conditions influence carbon exchange along gradient of arid, semi-arid, sub-humid ecosystems based on eddy covariance datasets. After EPEs, ecosystem respiration gross primary productivity (GPP) were stimulated by pulses soil moisture arid semi-arid regions, but suppressed decreased temperature region. Antecedent condition determined asynchronous response GPP therefore fluctuations net balance. Net uptake capacity was enhanced immediately following wet-EPEs because rapid greater than respiration. However, after dry-EPEs, increased thereafter dry-EPEs lagged behind More further accumulative uptake. In general, accumulated within 3 weeks two times seven that region, respectively. acted as a sink wet-EPEs, source dry-EPEs. We conclude local climate regimes need considered when interpreting EPEs dryland ecosystems.

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ژورنال

عنوان ژورنال: Theoretical and Applied Climatology

سال: 2022

ISSN: ['1434-4483', '0177-798X']

DOI: https://doi.org/10.1007/s00704-022-04134-0