干旱区生态环境知识资源中心(Arid): Bridging ecology and physics: Australian fairy circles regenerate following model assumptions on ecohydrological feedbacks

Arid

DOI	10.1111/1365-2745.13493
	Bridging ecology and physics: Australian fairy circles regenerate following model assumptions on ecohydrological feedbacks
	Getzin, Stephan; Erickson, Todd E.; Yizhaq, Hezi; Munoz-Rojas, Miriam; Huth, Andreas; Wiegand, Kerstin
通讯作者	Getzin, S
来源期刊	JOURNAL OF ECOLOGY
ISSN	0022-0477
EISSN	1365-2745
英文摘要	So-called fairy circles (FCs) comprise a spatially periodic gap pattern in arid grasslands of Namibia and north-west Western Australia. This pattern has been explained with scale-dependent ecohydrological feedbacks and the reaction-diffusion, or Turing mechanism, used in process-based models that are rooted in physics and pattern-formation theory. However, a detailed ecological test of the validity of the modelled processes is still lacking. Here, we test in a spinifex-grassland ecosystem of Western Australia the presence of spatial feedbacks at multiple scales. Drone-based multispectral analysis and spatially explicit statistics were used to test if grass vitality within five 1-ha plots depends on the pattern of FCs that are thought to be a critical extra source of water for the surrounding matrix vegetation. We then examined if high- and low-vitality grasses show scale-dependent feedbacks being indicative of facilitation or competition. Additionally, we assessed facilitation of grass plants for different successional stages after fire at fine scales in 1-m(2)quadrats. Finally, we placed soil moisture sensors under bare soil inside the FC gap and under plants at increasing distances from the FC to test if there is evidence for the 'infiltration feedback' as used in theoretical modelling. We found that high-vitality grasses were systematically more strongly associated with FCs than low-vitality grasses. High-vitality grasses also had highly aggregated patterns at short scales being evidence of positive feedbacks while negative feedbacks occurred at larger scales. Within 1-m(2)quadrats, grass cover and mutual facilitation of plants was greater near the FC edge than further away in the matrix. Soil moisture after rainfall was lowest inside the FC with its weathered surface crust but highest under grass at the gap edge, and then declined towards the matrix, which confirms the infiltration feedback. Synthesis. The study shows that FCs are a critical extra source of water for the dryland vegetation, as predicted by theoretical modelling. The grasses act as 'ecosystem engineers' that modify their hostile, abiotic environment, leading to vegetation self-organization. Overall, our ecological findings highlight the validity of the scale-dependent feedbacks that are central to explain this emergent grassland pattern via the reaction-diffusion or Turing-instability mechanism.
英文关键词	ecosystem engineer Normalized Difference Vegetation Index reaction-diffusion mechanism scale-dependent feedback spatial periodicity Turing dynamics unmanned aerial vehicle vegetation self-organization
类型	Article ; Early Access
语种	英语
开放获取类型	Other Gold
收录类别	SCI-E
WOS记录号	WOS:000571407000001
WOS关键词	VEGETATION PATTERNS ; SELF-ORGANIZATION ; BANDED VEGETATION ; DESERT DUNES ; FACILITATION ; COMPETITION ; SYSTEMS ; ORIGIN ; SHIFTS
WOS类目	Plant Sciences ; Ecology
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology
来源机构	Ben-Gurion University of the Negev ; University of Western Australia
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/328262
作者单位	[Getzin, Stephan; Wiegand, Kerstin] Univ Goettingen, Dept Ecosyst Modelling, Gottingen, Germany; [Getzin, Stephan; Huth, Andreas] UFZ Helmholtz Ctr Environm Res, Dept Ecol Modelling, Leipzig, Germany; [Erickson, Todd E.; Munoz-Rojas, Miriam] Univ Western Australia, Sch Biol Sci, Crawley, WA, Australia; [Erickson, Todd E.; Munoz-Rojas, Miriam] Kings Pk Sci, Dept Biodivers Conservat & Attract, Perth, WA, Australia; [Yizhaq, Hezi] Ben Gurion Univ Negev, Dept Solar Energy & Environm Phys, Sede Boqer, Palestine; [Munoz-Rojas, Miriam] UNSW Sydney, Sch Biol Earth & Environm Sci, Ctr Ecosyst Sci, Sydney, NSW, Australia
推荐引用方式 GB/T 7714	Getzin, Stephan,Erickson, Todd E.,Yizhaq, Hezi,et al. Bridging ecology and physics: Australian fairy circles regenerate following model assumptions on ecohydrological feedbacks[J]. Ben-Gurion University of the Negev, University of Western Australia.
APA	Getzin, Stephan,Erickson, Todd E.,Yizhaq, Hezi,Munoz-Rojas, Miriam,Huth, Andreas,&Wiegand, Kerstin.
MLA	Getzin, Stephan,et al."Bridging ecology and physics: Australian fairy circles regenerate following model assumptions on ecohydrological feedbacks".JOURNAL OF ECOLOGY