干旱区生态环境知识资源中心(Arid): Woody plant encroachment enhanced global vegetation greening and ecosystem water-use efficiency

Arid

DOI	10.1111/geb.13386
	Woody plant encroachment enhanced global vegetation greening and ecosystem water-use efficiency
	Deng, Yuanhong; Li, Xiaoyan; Shi, Fangzhong; Hu, Xia
通讯作者	Li, XY (corresponding author), Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, Fac Geog Sci, Beijing 100875, Peoples R China.
来源期刊	GLOBAL ECOLOGY AND BIOGEOGRAPHY
ISSN	1466-822X
EISSN	1466-8238
出版年	2021
英文摘要	Aim Encroachment of woody plants into grasslands and savannas (WPE) has been observed world-wide. However, the general ecohydrological effects of this striking change in land cover are uncertain owing to divergent results in various areas and unknown global spatial distribution. Here, we reveal the patterns and dynamics of WPE and its effects on leaf area index (LAI), gross primary production (GPP), components of evapotranspiration (ET) and ecosystem water-use efficiency (EWUE). Location Global. Time period Contemporary. Major taxa studied Woody plants. Methods We used remote sensing to identify the distribution of WPE in 2002-2018, validated at 442 WPE sites, and analysed the pattern of WPE across geographical gradients. The multi-time-scale impacts of WPE were revealed through pairwise comparison. Differences among biomes/climate zones were compared by the Kruskal-Wallis test. The relationship of WPE to vegetation greening and the effects of WPE on EWUE were explored. Results Global WPE expanded persistently from 2002 to 2018, but the rate of increase decreased after 2010; spatially, the average rate of change was .3%/year. High values of WPE in 2018 occurred in arid and semi-arid regions, with the peak WPE in the multi-annual mean precipitation of 350-400 mm. Pairwise comparison showed that WPE increased the LAI, GPP, ET and ratio of transpiration to ET, with the strongest effects in summer, and enhanced annual EWUE. Both global pixel- and site-level WPE mainly showed vegetation greening. The above findings varied among bioclimatic conditions; particularly in semi-arid areas, WPE was positively correlated with vegetation greening and remarkably improved EWUE. Main conclusions The ongoing WPE contributed to vegetation greening and elevated vegetation productivity by increasing the LAI and partitioning more water into transpiration; these findings indicate that the WPE process should be incorporated into the carbon cycle and ecohydrology models. However, attention should also be focused on controlling adverse consequences of WPE in arid areas.
英文关键词	evapotranspiration global gross primary productivity leaf area index vapour pressure deficit water-use efficiency woody plant encroachment
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000691410500001
WOS关键词	LEAF-AREA INDEX ; SHRUB ENCROACHMENT ; EVAPOTRANSPIRATION ; TERRESTRIAL ; GRASSLANDS ; DIVERSITY ; INCREASES ; EXPANSION ; DRYLANDS ; EARTH
WOS类目	Ecology ; Geography, Physical
WOS研究方向	Environmental Sciences & Ecology ; Physical Geography
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363462
作者单位	[Deng, Yuanhong; Li, Xiaoyan; Shi, Fangzhong; Hu, Xia] Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, Fac Geog Sci, Beijing 100875, Peoples R China; [Deng, Yuanhong; Li, Xiaoyan; Shi, Fangzhong; Hu, Xia] Beijing Normal Univ, Fac Geog Sci, Sch Nat Resources, Beijing, Peoples R China; [Li, Xiaoyan] Qinghai Normal Univ, Minist Educ, Key Lab Tibetan Plateau Land Surface Proc & Ecol, Xining, Peoples R China; [Li, Xiaoyan] Qinghai Normal Univ, Acad Plateau Sci & Sustainabil, Xining, Peoples R China
推荐引用方式 GB/T 7714	Deng, Yuanhong,Li, Xiaoyan,Shi, Fangzhong,et al. Woody plant encroachment enhanced global vegetation greening and ecosystem water-use efficiency[J]. 北京师范大学,2021.
APA	Deng, Yuanhong,Li, Xiaoyan,Shi, Fangzhong,&Hu, Xia.(2021).Woody plant encroachment enhanced global vegetation greening and ecosystem water-use efficiency.GLOBAL ECOLOGY AND BIOGEOGRAPHY.
MLA	Deng, Yuanhong,et al."Woody plant encroachment enhanced global vegetation greening and ecosystem water-use efficiency".GLOBAL ECOLOGY AND BIOGEOGRAPHY (2021).