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Extreme drought alters methane uptake but not methane sink in semi-arid steppes of Inner Mongolia.
Wen, Fuqi; Biederman, Joel A; Hao, Yanbin; Qian, Ruyan; Zheng, Zhenzhen; Cui, Xiaoyong; Zhao, Tong; Xue, Kai; Wang, Yanfen.
Afiliación
  • Wen F; College of Life Sciences, University Chinese Academy of Sciences, Beijing, China.
  • Biederman JA; Southwest Watershed Research Center, Agricultural Research Service, Tucson, AZ, USA.
  • Hao Y; College of Life Sciences, University Chinese Academy of Sciences, Beijing, China; Yanshan Earth Critical Zone and Surface Fluxes Research Station, Chinese Academy of Sciences, Beijing 101408, China.. Electronic address: ybhao@ucas.edu.cn.
  • Qian R; College of Life Sciences, University Chinese Academy of Sciences, Beijing, China.
  • Zheng Z; College of Life Sciences, University Chinese Academy of Sciences, Beijing, China.
  • Cui X; College of Life Sciences, University Chinese Academy of Sciences, Beijing, China; Yanshan Earth Critical Zone and Surface Fluxes Research Station, Chinese Academy of Sciences, Beijing 101408, China.
  • Zhao T; School of Mathematics Sciences, University Chinese Academy of Sciences, Beijing 101408, China.
  • Xue K; Yanshan Earth Critical Zone and Surface Fluxes Research Station, Chinese Academy of Sciences, Beijing 101408, China.; Key Laboratory of Adaptation and Evolution of Plateau Biota, Chinese Academy of Sciences, Xining 810001, China; College of Resources and Environment, University Chinese Academy of Sc
  • Wang Y; Yanshan Earth Critical Zone and Surface Fluxes Research Station, Chinese Academy of Sciences, Beijing 101408, China.; College of Resources and Environment, University Chinese Academy of Sciences, Beijing 101408, China.
Sci Total Environ ; 915: 169834, 2024 Mar 10.
Article en En | MEDLINE | ID: mdl-38190902
ABSTRACT
Global climate change, particularly drought, is expected to alter grassland methane (CH4) oxidation, a key natural process against atmospheric greenhouse gas accumulation, yet the extent of this effect and its interaction with future atmospheric CH4 concentrations increases remains uncertain. To address this research gap, we measured CH4 flux during an imposed three-month rain-free period corresponding to a 100-year recurrence drought in soil mesocosms collected from 16 different Eurasian steppe sites. We also investigated the abundance and composition of methanotrophs. Additionally, we conducted a laboratory experiment to explore the impact of elevated CH4 concentration on the CH4 uptake capacity of grassland soil under drought conditions. We found that regardless of the type of grassland, CH4 flux was still being absorbed at its peak, meaning that all grasslands functioned as persistent CH4 sinks even when the soil water content (SWC) was <5 %. A bell-shaped relationship between SWC and CH4 uptake was observed in the soils. The average maximum CH4 oxidation rate in the meadow steppe was higher than that in the typical and desert steppe soils during extreme drought. The experimental elevation of atmospheric CH4 concentration counteracted the anticipated reduction in CH4 uptake related to physiological water stress on methanotrophic soil microbes under the drought stress. On the contrary, we found that across the regional scale, nitrogen, phosphorous, and total soil organic content played a crucial role in moderating the duration and magnitude of CH4 uptake with respect to SWC. USC-γ (Upland Soil Cluster γ) and JR-3 (Jasper Ridge Cluster) were the dominant group of soil methanotrophic bacteria in three types of grassland. However, the methanotrophic abundance, rather than the methanotrophic community composition, was the dominant microbiological factor governing CH4 uptake during the drought.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Total Environ Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Total Environ Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Países Bajos