Arid
DOI10.1088/1748-9326/ab3dde
Drought-induced regime shift and resilience of a Sahelian ecohydrosystem
Wendling, Valentin1; Peugeot, Christophe1; Mayor, Angeles G.2; Hiernaux, Pierre3; Mougin, Eric3; Grippa, Manuela3; Kergoat, Laurent3; Walcker, Romain4; Galle, Sylvie5; Lebel, Thierry5
通讯作者Peugeot, Christophe
来源期刊ENVIRONMENTAL RESEARCH LETTERS
ISSN1748-9326
出版年2019
卷号14期号:10
英文摘要The Sahel (a semi-arid fringe south of the Sahara) experienced a long and prolonged drought from the 1970s to the mid-1990s, with a few extremely severe episodes that strongly affected ecosystems and societies. Long-term observations showed that surface runoff increased during this period, despite the rainfall deficit. This paradox stems from the soil degradation that was induced by various factors, either directly linked to the drought (impact on vegetation cover), or, in places, to human practices (land clearing and cropping). Surface runoff is still increasing throughout the region, suggesting that Sahelian ecohydrosystems may have shifted to a new hydrological regime. In order to explore this issue, we have developed a simple system dynamics model incorporating vegetation-hydrology interactions and representing in a lumped way the first order processes occurring at the hillslope scale and the annual timestep. Long term observations on a pilot site in northern Mali were used to constrain the model and define an ensemble of plausible simulations. The model successfully reproduced the vegetation collapse and the runoff increase observed over the last 60 years. Our results confirmed that the system presents two alternative states and that during the drought it shifted from a high-vegetation/low-runoff regime to the alternative low-vegetation/high-runoff one, where it has remained trapped until now. We showed that the mean annual rainfall deficit was sufficient to explain the shift. According to the model, vegetation recovery and runoff reduction are possible in this system, but the conditions in which they could occur remain uncertain as the model was only constrained by observations over the collapse trajectory. The study shows that the system is also sensitive to the interannual and decadal variability of rainfall, and that larger variability leads to higher runoff. Both mean rainfall and rainfall variability may increase in central Sahel under climate change, leading to antagonist effects on the system, which makes its resilience uncertain.
英文关键词Sahel eco-hydrology alternative stable states regime shifts rainfall variability
类型Article
语种英语
国家France ; Netherlands
开放获取类型Green Published, gold
收录类别SCI-E
WOS记录号WOS:000500820500001
WOS关键词CATASTROPHIC SHIFTS ; VEGETATION PATTERN ; SEMIARID AREAS ; LINKING THEORY ; TREE COVER ; TIGER BUSH ; CLIMATE ; WATER ; RUNOFF ; FOREST
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
EI主题词2019-10-01
来源机构French National Research Institute for Sustainable Development
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/310159
作者单位1.Univ Montpellier, CNRS, IRD, Hydrosci Montpellier HSM, Montpellier, France;
2.Univ Utrecht, Copernicus Inst Sustainable Dev Geosci Environm, Utrecht, Netherlands;
3.UPS, IRD, CNRS, GET, Toulouse, France;
4.UPS, CNRS, Toulouse INP, Lab Ecol Fonct & Environm ECOLAB, Toulouse, France;
5.Univ Grenoble Alpes, CNRS, IRD, Grenoble INP,UMRIGE, Grenoble, France
推荐引用方式
GB/T 7714
Wendling, Valentin,Peugeot, Christophe,Mayor, Angeles G.,et al. Drought-induced regime shift and resilience of a Sahelian ecohydrosystem[J]. French National Research Institute for Sustainable Development,2019,14(10).
APA Wendling, Valentin.,Peugeot, Christophe.,Mayor, Angeles G..,Hiernaux, Pierre.,Mougin, Eric.,...&Lebel, Thierry.(2019).Drought-induced regime shift and resilience of a Sahelian ecohydrosystem.ENVIRONMENTAL RESEARCH LETTERS,14(10).
MLA Wendling, Valentin,et al."Drought-induced regime shift and resilience of a Sahelian ecohydrosystem".ENVIRONMENTAL RESEARCH LETTERS 14.10(2019).
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Wendling, Valentin]的文章
[Peugeot, Christophe]的文章
[Mayor, Angeles G.]的文章
百度学术
百度学术中相似的文章
[Wendling, Valentin]的文章
[Peugeot, Christophe]的文章
[Mayor, Angeles G.]的文章
必应学术
必应学术中相似的文章
[Wendling, Valentin]的文章
[Peugeot, Christophe]的文章
[Mayor, Angeles G.]的文章
相关权益政策
暂无数据
收藏/分享

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。