干旱区生态环境知识资源中心(Arid): Ecological mechanisms underlying aridity thresholds in global drylands

Arid

DOI	10.1111/1365-2435.13962
	Ecological mechanisms underlying aridity thresholds in global drylands
	Berdugo, Miguel; Vidiella, Blai; Sole, Ricard V.; Maestre, Fernando T.
通讯作者	Berdugo, M (corresponding author), UPF PRBB, ICREA Complex Syst Lab, Barcelona, Spain. ; Berdugo, M (corresponding author), CSIC UPF, Inst Biol Evolut, Barcelona, Spain. ; Berdugo, M (corresponding author), Swiss Fed Inst Technol, Inst Integrat Biol, Dept Environm Syst Sci, Zurich, Switzerland.
来源期刊	FUNCTIONAL ECOLOGY
ISSN	0269-8463
EISSN	1365-2435
出版年	2022
英文摘要	1. With ongoing climate change, the probability of crossing environmental thresholds promoting abrupt changes in ecosystem structure and functioning is higher than ever. In drylands (areas where it rains <65% of what could be potentially evaporated), recent research has shown how the crossing of three aridity thresholds [at aridity (1-Aridity Index) values of 0.54, 0.70 and 0.80] leads to abrupt changes on ecosystem structural and functional attributes. Despite the importance of these findings and their implications to develop effective monitoring and adaptation actions to combat climate change and desertification, we lack a proper understanding of the mechanisms unleashing these abrupt shifts. 2. Here we review multiple mechanisms that may explain the existence of aridity thresholds observed across global drylands, and discuss the potential amplification mechanisms that may underpin hypothetical abrupt temporal shifts with climate change. 3. We propose that each aridity threshold is caused by different and specific mechanisms. The first threshold is mainly caused by physiological mechanisms of plant adaptation to water shortages. The second threshold is unleashed by different mechanisms involving soil processes and plant-soil interactions such as soil erosion, plant community shifts and nutrient cycling and circulation. The collapse of vegetation observed once the third aridity threshold (0.8) is crossed is caused by the mechanisms related to the survival limits of plants that may cause sudden cover and diversity losses and plant-atmospheric feedbacks that link vegetation collapse with further climate aridification. 4. By identifying, revising and linking relevant mechanisms to each aridity threshold observed, we provide a set of specific hypotheses and identify knowledge gaps concerning the study of threshold emergence in drylands. We were also able to establish plausible factors that are context dependent and may influence the occurrence of abrupt ecosystem changes in time. Our review may help to focus future research efforts on aridity thresholds and to develop strategies to monitor, adapt to or even revert abrupt ecosystem changes across global drylands.
英文关键词	abrupt shifts climate change dryland ecology ecological mechanisms nonlinear responses positive feedbacks thresholds
类型	Article
语种	英语
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000716796900001
WOS关键词	SHRUB ENCROACHMENT ; CLIMATE-CHANGE ; ECOSYSTEM MULTIFUNCTIONALITY ; REGIME SHIFTS ; SOIL TEXTURE ; PHENOTYPIC PLASTICITY ; CASCADING EXTINCTIONS ; LITTER DECOMPOSITION ; FUNCTIONAL DIVERSITY ; CATASTROPHIC SHIFTS
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/367679
作者单位	[Berdugo, Miguel; Vidiella, Blai; Sole, Ricard V.] UPF PRBB, ICREA Complex Syst Lab, Barcelona, Spain; [Berdugo, Miguel; Vidiella, Blai; Sole, Ricard V.] CSIC UPF, Inst Biol Evolut, Barcelona, Spain; [Berdugo, Miguel] Swiss Fed Inst Technol, Inst Integrat Biol, Dept Environm Syst Sci, Zurich, Switzerland; [Sole, Ricard V.] Santa Fe Inst, Santa Fe, NM 87501 USA; [Maestre, Fernando T.] Univ Alicante, Inst Multidisciplinar Estudio Medio Ramon Margale, Alicante, Spain; [Maestre, Fernando T.] Univ Alicante, Dept Ecol, Alicante, Spain
推荐引用方式 GB/T 7714	Berdugo, Miguel,Vidiella, Blai,Sole, Ricard V.,et al. Ecological mechanisms underlying aridity thresholds in global drylands[J],2022.
APA	Berdugo, Miguel,Vidiella, Blai,Sole, Ricard V.,&Maestre, Fernando T..(2022).Ecological mechanisms underlying aridity thresholds in global drylands.FUNCTIONAL ECOLOGY.
MLA	Berdugo, Miguel,et al."Ecological mechanisms underlying aridity thresholds in global drylands".FUNCTIONAL ECOLOGY (2022).