气候变化领域集成服务门户(CCPortal): Feedbacks of soil properties on vegetation during the Green Sahara period

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DOI	10.1016/j.quascirev.2020.106389
	Feedbacks of soil properties on vegetation during the Green Sahara period
	Chen W.; Ciais P.; Zhu D.; Ducharne A.; Viovy N.; Qiu C.; Huang C.
发表日期	2020
ISSN	0277-3791
卷号	240
英文摘要	During the early to middle Holocene, the Sahara received enhanced precipitation and was covered by steppe-like vegetation with a large-scale hydrographic network of lakes, wetlands and fans, which is known as the Green Sahara (GS). However, most coupled land-atmosphere models underestimate the precipitation and vegetation cover, suggesting that critical atmospheric or land surface processes are lacking in those models. Climate-induced vegetation cover change can modify soil texture and physical properties over the long term, which in turn have feedbacks on vegetation. In this study, we examine five plausible soil-vegetation processes in a land surface model, which are expected to increase soil moisture for plants and possibly sustain equilibrium vegetation for a lower rainfall level. The annual precipitation required during the GS epoch to match the modelled vegetation distribution with paleorecords is inferred. Results demonstrate that these soil-vegetation processes have strong positive impacts on vegetation and soil moisture, especially the increase of soil evaporative resistance. After including all soil feedbacks on vegetation, the model requires only a mean precipitation of ∼400 mm/yr to reproduce the pollen-inferred GS vegetation, instead of ∼600 mm/yr when no soil feedback is included. From the mid-Holocene to pre-industrial period, we infer that terrestrial carbon stocks decrease by ∼58 PgC due to the removal of carbon in vegetation, soil and litter pools of the GS. This work highlights the importance of soil-vegetation interactions for simulating dry-region vegetation coverage in models, and the impacts of natural land cover change on carbon budgets in the geological past. © 2020 Elsevier Ltd
英文关键词	Bare soil evaporation; Dynamic global vegetation model (DGVM); Mid-holocene; Soil organic carbon; Soil texture; Water infiltration
语种	英语
scopus关键词	Budget control; Carbon; Climate change; Soil moisture; Surface measurement; Textures; Annual precipitation; Evaporative resistances; Hydrographic networks; Land surface modeling; Land-surface process; Mean precipitation; Vegetation coverage; Vegetation distribution; Vegetation; air-soil interaction; carbon sequestration; climate effect; evapotranspiration; feedback mechanism; Holocene; lake ecosystem; soil moisture; soil property; soil-vegetation interaction; steppe; vegetation structure; wetland; Sahara
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151423
作者单位	State Key Laboratory of Biogeology and Environmental Geology, Hubei Key Laboratory of Critical Zone Evolution, School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China; Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, Gif-sur-Yvette, 91191, France; Sorbonne Université, CNRS, EPHE, Milieux environnementaux, transferts et interaction dans les hydrosystèmes et les sols, Metis, Paris, 75005, France
推荐引用方式 GB/T 7714	Chen W.,Ciais P.,Zhu D.,et al. Feedbacks of soil properties on vegetation during the Green Sahara period[J],2020,240.
APA	Chen W..,Ciais P..,Zhu D..,Ducharne A..,Viovy N..,...&Huang C..(2020).Feedbacks of soil properties on vegetation during the Green Sahara period.Quaternary Science Reviews,240.
MLA	Chen W.,et al."Feedbacks of soil properties on vegetation during the Green Sahara period".Quaternary Science Reviews 240(2020).