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The response of soil carbon mineralization losses to changes in rainfall frequency is seasonally dependent in an estuarine saltmarsh
Soil Biology and Biochemistry ( IF 9.8 ) Pub Date : 2024-07-20 , DOI: 10.1016/j.soilbio.2024.109538 Xue Li , Kelong Chen , Qiqi Zhang , Xiaoshuai Zhang , Xiaojie Wang , Mingliang Zhao , Peiguang Li , Baohua Xie , Guangxuan Han , Weimin Song
Soil Biology and Biochemistry ( IF 9.8 ) Pub Date : 2024-07-20 , DOI: 10.1016/j.soilbio.2024.109538 Xue Li , Kelong Chen , Qiqi Zhang , Xiaoshuai Zhang , Xiaojie Wang , Mingliang Zhao , Peiguang Li , Baohua Xie , Guangxuan Han , Weimin Song
Altered rainfall distribution patterns resulting from climate change have substantial effects on soil carbon (C) cycling in terrestrial ecosystems particularly in water-limited regions. However, how rainfall redistribution affects soil C mineralization (CO and CH fluxes) in humid regions such as of the coastal saltmarshes remain unclear. We conducted mesocosm experiments in an estuarine saltmarsh in the Yellow River Delta of China, where we simulated three rainfall frequency scenarios (high-frequency, medium-frequency and low-frequency) with the same total rainfall amount in the dry and wet seasons, respectively. Soil CO and CH fluxes were measured before and after rain frequency treatment during a 40-day period for each season. The decrease in rainfall frequency significantly reduced the mean soil CO and CH fluxes during the dry season, but had no effect on either flux during the wet season. The seasonal variation in the response of soil C mineralization to rainfall frequency changes could be explained by the changes in antecedent soil water and salinity conditions, soil C substrate, microbial activities and diversity. Thus, the effects of changes in rainfall frequency on soil C mineralization are regulated by season, and should be considered when predicting the future C balance of coastal wetland ecosystems. Furthermore, the shift in precipitation frequency distribution towards increasing heavy rainfall events during the dry season in this region will have a great effect on soil C losses, potentially feeding back into the soil C budget and stability in this estuarine saltmarsh.
更新日期：2024-07-20
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