干旱区生态环境知识资源中心(Arid): Recent changes in global drylands: Evidences from two major aridity databases

Arid

DOI	10.1016/j.catena.2019.03.016
	Recent changes in global drylands: Evidences from two major aridity databases
	Pravalie, Remus 1; Bandoc, Georgeta 1,2; Patriche, Cristian 3; Sternberg, Troy 4
通讯作者	Pravalie, Remus
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2019
卷号	178 页码:209-231
英文摘要	Drying of terrestrial areas is a critical issue in our era of climate change. However, there is limited knowledge on the current spatial status of drylands, which can be assessed using updated and more rigorous data than information used in the initial dryland estimations. Here we investigate the current extent of drylands globally, continentally and nationally by analysing one of the most recent aridity database (1950-2000 period) and compare statistically, for the first time, with the initial dryland estimations (1951-1980). Using diachronic analysis between the databases, we found that drylands are currently almost 4% larger worldwide than expected and cover 45.4% of the Earth's land surface. This net increase of global dryland areas is due to the expansion of arid (+3.4%) and semi-arid (+0.9%) areas, whilst hyper-arid zones decreased (-0.8%) and dry sub-humid areas remained stable. Except for Europe and South America, all continents have experienced a net expansion of arid environments in the recent climate database. Our findings show that Asia is home to the world's largest increases in dryland areas, where China alone accounts for almost one third of the new lands exposed to aridity worldwide. The Earth's drier conditions can generally be attributed to climate changes occurring after 1980. Our results highlight large-scale drying processes and therefore the exacerbation of land degradative conditions at low and middle latitudes. Also, our findings signal the danger of triggering certain positive feedbacks in global warming, considering the newly-identified drylands migration towards higher latitudes in North America and Asia, which can modify the albedo and destabilize the large carbon pools in permafrost, peatlands or boreal forests.
英文关键词	Global drylands Diachronic analysis Expansion Land degradation Climate warming
类型	Article
语种	英语
国家	Romania ; England
收录类别	SCI-E
WOS记录号	WOS:000466999700021
WOS关键词	CLIMATE-CHANGE ; AEOLIAN DESERTIFICATION ; LAND DEGRADATION ; DEGREES-C ; RESPONSES ; EVAPOTRANSPIRATION ; VARIABILITY ; PERMAFROST ; TRENDS ; AREAS
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
来源机构	University of Oxford
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214839
作者单位	1.Univ Bucharest, Fac Geog, 1 Nicolae Balcescu St, Bucharest 010041, Romania; 2.Acad Romanian Scientists, 54 Splaitel Independentei St, Bucharest 050085, Romania; 3.Romanian Acad, Iasi Div, Dept Geog, 8 Carol I St, Iasi 700505, Romania; 4.Univ Oxford, Sch Geog, South Parks Rd, Oxford OX1 3QY, England
推荐引用方式 GB/T 7714	Pravalie, Remus,Bandoc, Georgeta,Patriche, Cristian,et al. Recent changes in global drylands: Evidences from two major aridity databases[J]. University of Oxford,2019,178:209-231.
APA	Pravalie, Remus,Bandoc, Georgeta,Patriche, Cristian,&Sternberg, Troy.(2019).Recent changes in global drylands: Evidences from two major aridity databases.CATENA,178,209-231.
MLA	Pravalie, Remus,et al."Recent changes in global drylands: Evidences from two major aridity databases".CATENA 178(2019):209-231.