气候变化领域集成服务门户(CCPortal): Quantification and uncertainty of global upland soil methane sinks: Processes, controls, model limitations, and improvements

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DOI	10.1016/j.earscirev.2024.104758
	Quantification and uncertainty of global upland soil methane sinks: Processes, controls, model limitations, and improvements
	Song, Hanxiong; Peng, Changhui; Zhu, Qiuan; Chen, Zhi; Blanchet, Jean-Pierre; Liu, Qiuyu; Li, Tong; Li, Peng; Liu, Zelin
发表日期	2024
ISSN	0012-8252
EISSN	1872-6828
起始页码	252
卷号	252
英文摘要	Upland soils constitute the second largest and the only manageable methane (CH 4 ) sink, yet current estimations remain substantially uncertain. This review identifies the primary sources of model uncertainties and emphasize the need for improved model accuracy and necessary comprehensiveness to better estimate upland soil CH 4 uptake under global change. We highlight that the limitations of diffusion-reaction models include oversimplified assumptions of upland soils as constant CH 4 sinks and insufficient parameterization of the microbial CH 4 oxidation constants. In process-based biogeochemical models, uncertainties stem from the omission of soil O 2 status and oversimplified Michaelis - Menten kinetics parameterization for upland soils. We also provide three suggestions for better addressing the spatiotemporal variations in soil CH 4 uptake globally. 1) Accounting for the balance between methanotrophy and methanogenesis is the key to accurately assessing CH 4 fluxes at fine to large scales. 2) Improved response curves of methanotrophy to soil moisture, temperature, and mineral nitrogen, as the most important regulators, are needed to correct the underestimated spatial variations in the size of the soil CH 4 sink globally. 3) Improving parameterizations based on the relationships between environmental factors and methanotrophic communities is necessary. Our synthesized model estimations and field observations reveal that inconsistent estimations of the spatial variations in forest soil CH 4 sinks, and the neglect of the drylands (arid and semiarid ecosystems) CH 4 sink are the major sources of uncertainty for global upland soil CH 4 sinks. Given the great potential of soil CH 4 uptake in mitigating the imbalanced global CH 4 budget, we emphasize the necessity of addressing the soil CH 4 exchanges in these key ecosystems, particularly under the impacts of global changes, by integrating continuous in -situ observations with improved models to fully account for the dynamics of the terrestrial CH 4 sink. This review contributes to a more accurate estimation, management, and optimization of global upland soil CH 4 sinks, aiding in the development of effective climate change mitigation strategies.
英文关键词	Soil CH 4 uptake; Methanotrophy; Soil moisture; Diffusion-reaction model; Process-based biogeochemical model; Tropical forests; Drylands; Climate changes
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001219513400001
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/305381
作者单位	Hunan Normal University; University of Quebec; University of Quebec Montreal; Hohai University; Concordia University - Canada; Xi'an Jiaotong University
推荐引用方式 GB/T 7714	Song, Hanxiong,Peng, Changhui,Zhu, Qiuan,et al. Quantification and uncertainty of global upland soil methane sinks: Processes, controls, model limitations, and improvements[J],2024,252.
APA	Song, Hanxiong.,Peng, Changhui.,Zhu, Qiuan.,Chen, Zhi.,Blanchet, Jean-Pierre.,...&Liu, Zelin.(2024).Quantification and uncertainty of global upland soil methane sinks: Processes, controls, model limitations, and improvements.EARTH-SCIENCE REVIEWS,252.
MLA	Song, Hanxiong,et al."Quantification and uncertainty of global upland soil methane sinks: Processes, controls, model limitations, and improvements".EARTH-SCIENCE REVIEWS 252(2024).