干旱区生态环境知识资源中心(Arid): Global-scale characterization of turning points in arid and semi-arid ecosystem functioning

Arid

DOI	10.1111/geb.13099
	Global-scale characterization of turning points in arid and semi-arid ecosystem functioning
	Bernardino, Paulo N.1,2; De Keersmaecker, Wanda 1; Fensholt, Rasmus 3; Verbesselt, Jan 2; Somers, Ben 1; Horion, Stephanie 3
通讯作者	Bernardino, Paulo N.
来源期刊	GLOBAL ECOLOGY AND BIOGEOGRAPHY
ISSN	1466-822X
EISSN	1466-8238
出版年	2020
卷号	29 期号:7 页码:1230-1245
英文摘要	Aim Changes in dryland ecosystem functioning are threatening the well-being of human populations worldwide, and land degradation, exacerbated by climate change, contributes to biodiversity loss and puts pressures on sustainable livelihoods. Here, abrupt changes in ecosystem functioning [so-called turning points (TPs)] were detected using time series of Earth observation data. Hotspot areas of high TP occurrence were identified, observed changes characterized and insights gained on potential drivers for these changes. Location Arid and semi-arid regions. Time period 1982-2015. Methods We used a time series segmentation technique (breaks for additive season and trend) to detect breakpoints in rain-use efficiency as a means of analysing changes in ecosystem functioning. A new typology to characterize the detected changes was proposed and evaluated, at regional to local scales, for a set of case studies. Ancillary data on population and drought were used to provide insights on potential drivers of TP occurrence. Results Turning points in ecosystem functioning were found in 13.6% (c. 2.1 x 10(6) km(2)) of global drylands. Turning point hotspots were primarily observed in North America, the Sahel, Central Asia and Australia. In North America, the majority of TPs (62.6%) were characterized by a decreasing trend in ecosystem functioning, whereas for the other regions, a positive reversal in ecosystem functioning was prevalent. Further analysis showed that: (a) both climatic and anthropogenic pressure influenced the occurrence of TPs in North America; (b) Sahelian grasslands were primarily characterized by drought-induced TPs; and (c) high anthropogenic pressure coincided with the occurrence of TPs in Asia and Australia. Main conclusions By developing a new typology targeting the categorization of abrupt and gradual changes in ecosystem functioning, we detected and characterized TPs in global drylands. This TP characterization is a first crucial step towards understanding the drivers of change and supporting better decision-making for ecosystem conservation and management in drylands.
英文关键词	arid regions ecosystem functioning human-natural system land degradation rain-use efficiency remote sensing segmented trend analysis semi-arid regions turning point
类型	Article
语种	英语
国家	Belgium ; Netherlands ; Denmark
开放获取类型	Green Published, hybrid
收录类别	SCI-E
WOS记录号	WOS:000525077300001
WOS关键词	AFRICAN SAHEL ; VEGETATION ; CLIMATE ; DROUGHT ; DESERTIFICATION ; TRENDS ; QUEENSLAND ; DYNAMICS ; PATTERNS ; DATASETS
WOS类目	Ecology ; Geography, Physical
WOS研究方向	Environmental Sciences & Ecology ; Physical Geography
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314643
作者单位	1.Katholieke Univ Leuven, Div Forest Nat & Landscape, Celestijnenlaan 200E, B-3001 Leuven, Belgium; 2.Wageningen Univ, Lab Geoinformat Sci & Remote Sensing, Wageningen, Netherlands; 3.Univ Copenhagen, Dept Geosci & Nat Resource Management IGN, Copenhagen, Denmark
推荐引用方式 GB/T 7714	Bernardino, Paulo N.,De Keersmaecker, Wanda,Fensholt, Rasmus,et al. Global-scale characterization of turning points in arid and semi-arid ecosystem functioning[J],2020,29(7):1230-1245.
APA	Bernardino, Paulo N.,De Keersmaecker, Wanda,Fensholt, Rasmus,Verbesselt, Jan,Somers, Ben,&Horion, Stephanie.(2020).Global-scale characterization of turning points in arid and semi-arid ecosystem functioning.GLOBAL ECOLOGY AND BIOGEOGRAPHY,29(7),1230-1245.
MLA	Bernardino, Paulo N.,et al."Global-scale characterization of turning points in arid and semi-arid ecosystem functioning".GLOBAL ECOLOGY AND BIOGEOGRAPHY 29.7(2020):1230-1245.