干旱区生态环境知识资源中心(Arid): Intermittent percolation and the scale-free distribution of vegetation clusters

Arid

DOI	10.1088/1367-2630/ab9f6e
	Intermittent percolation and the scale-free distribution of vegetation clusters
	Martin, Paula Villa; Dominguez-Garcia, Virginia; Munoz, Miguel A.
通讯作者	Munoz, MA
来源期刊	NEW JOURNAL OF PHYSICS
ISSN	1367-2630
出版年	2020
卷号	22 期号:8
英文摘要	Understanding the causes and effects of spatial vegetation patterns is a fundamental problem in ecology, especially because these can be used as early predictors of catastrophic shifts such as desertification processes. Empirical studies of the vegetation cover in some areas such as drylands and semiarid regions have revealed the existence of vegetation patches of broadly diverse sizes. In particular, the probability distribution of patch sizes can be fitted by a power law, i.e. vegetation patches are approximately scale free up to some maximum size. Different explanatory mechanisms, such as plant-plant interactions and plant-water feedback loops have been proposed to rationalize the emergence of such scale-free patterns, yet a full understanding has not been reached. Using a simple model for vegetation dynamics, we show that environmental temporal variability-a well-recognized feature of semiarid environments-promotes in a robust way (i.e. for a wide range of parameter values) the emergence of vegetation patches with broadly distributed cluster sizes. Furthermore, this result is related to a percolation phenomenon that occurs in an intermittent or fluctuating way. The model also reveals that the power-law exponents fitting the tails of the probability distributions depend on the overall vegetation-cover density, in agreement with empirical observations. This supports the idea that environmental variability plays a key role in the formation of scale-free vegetation patterns. From a practical viewpoint, this may be of importance to predict the effects that changes in environmental conditions may have in real ecosystems. From a theoretical side, our study sheds new light on a novel type of percolation phenomena occurring under temporally-varying external conditions, that still needs further work to be fully characterized.
英文关键词	scale invariance power laws percolation spatial patterns multiplicative noise
类型	Article
语种	英语
开放获取类型	DOAJ Gold
收录类别	SCI-E
WOS记录号	WOS:000560681500001
WOS关键词	SELF-ORGANIZED CRITICALITY ; CATASTROPHIC SHIFTS ; SIZE DISTRIBUTIONS ; PATTERN-FORMATION ; POWER LAWS ; PATCHINESS ; COEXISTENCE ; TRANSITION ; SHARPNESS ; ECOLOGY
WOS类目	Physics, Multidisciplinary
WOS研究方向	Physics
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/2XILL650/325690
作者单位	[Martin, Paula Villa] Okinawa Inst Sci & Technol & Grad Univ, Biol Complex Unit, Okinawa 9040495, Japan; [Dominguez-Garcia, Virginia] Univ Montpellier, CNRS, ISEM, EPHE,IRD, F-34095 Montpellier, France; [Munoz, Miguel A.] Univ Granada, Dept Electromagnetismo & Fis Mat, E-18071 Granada, Spain; [Munoz, Miguel A.] Univ Granada, Inst Carlos I Fis Teor & Computac, E-18071 Granada, Spain
推荐引用方式 GB/T 7714	Martin, Paula Villa,Dominguez-Garcia, Virginia,Munoz, Miguel A.. Intermittent percolation and the scale-free distribution of vegetation clusters[J]. French National Research Institute for Sustainable Development,2020,22(8).
APA	Martin, Paula Villa,Dominguez-Garcia, Virginia,&Munoz, Miguel A..(2020).Intermittent percolation and the scale-free distribution of vegetation clusters.NEW JOURNAL OF PHYSICS,22(8).
MLA	Martin, Paula Villa,et al."Intermittent percolation and the scale-free distribution of vegetation clusters".NEW JOURNAL OF PHYSICS 22.8(2020).