干旱区生态环境知识资源中心(Arid): Divergent trends of ecosystem-scale photosynthetic efficiency between arid and humid lands across the globe

Arid

DOI	10.1111/geb.13561
	Divergent trends of ecosystem-scale photosynthetic efficiency between arid and humid lands across the globe
	Wei, Fangli; Wang, Shuai; Fu, Bojie; Wang, Lanhui; Zhang, Wenmin; Wang, Lixin; Pan, Ning; Fensholt, Rasmus
通讯作者	Fu, BJ
来源期刊	GLOBAL ECOLOGY AND BIOGEOGRAPHY
ISSN	1466-822X
EISSN	1466-8238
出版年	2022
卷号	31 期号:9 页码:1824-1837
英文摘要	Aim Widespread greening and an increasing global terrestrial carbon sink over recent decades have been reported. However, the spatio-temporal relationships between vegetation greenness and productivity and the factors influencing this relationship remain unclear. We define a new metric of ecosystem-scale photosynthetic efficiency (EPE) to analyse its spatio-temporal pattern and investigate how potential drivers regulate the greenness-productivity relationship. Location Global. Time period From 2001 to 2016. Major taxa studied Global terrestrial ecosystems. Methods This study used global datasets of leaf area index (LAI) and solar-induced fluorescence (SIF) as proxies of vegetation greenness and ecosystem productivity, respectively, to propose a new metric of SIF/LAI, representing ecosystem-scale photosynthetic efficiency (EPE). We identified the spatial pattern and dynamics of EPE and examined factors influencing EPE. Results The results showed a weaker increase in productivity compared with the global greening rate from 2001 to 2016, suggesting a decline in EPE at the global scale. This decline in EPE indicates a disproportionate increase in terrestrial productivity against the widespread greening. When stratified into areas following an aridity gradient, we found that EPE overall showed upward trends in arid and semi-arid areas, and downward trends in dry sub-humid and humid regions. The EPE was controlled primarily by soil moisture, which promoted or constrained the EPE in xeric and mesic ecosystems, respectively. Moreover, the increase in short vegetation cover and atmospheric water demand contributed positively or negatively to EPE changes in xeric and mesic ecosystems, respectively. Main conclusions Our study shows that greening of the Earth is associated with decreasing EPE, revealing that current rates of carbon sequestration do not increase proportionally to greening of the Earth and highlighting that soil moisture is a key controller of EPE. These results help to reduce the uncertainties in future climate change impacts on vegetation dynamics, thus having implications for sustainable ecosystem management and climate change mitigation.
英文关键词	aridity gradients atmospheric water vapour leaf area index photosynthetic efficiency soil moisture solar-induced fluorescence
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000819569300001
WOS关键词	GROSS PRIMARY PRODUCTION ; CHLOROPHYLL FLUORESCENCE ; VEGETATION GREENNESS ; DRYLAND ECOSYSTEMS ; LEAF-AREA ; SATELLITE ; DYNAMICS ; PRODUCTIVITY ; RETRIEVAL ; EARTH
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/2XILL650/392974
推荐引用方式 GB/T 7714	Wei, Fangli,Wang, Shuai,Fu, Bojie,et al. Divergent trends of ecosystem-scale photosynthetic efficiency between arid and humid lands across the globe[J],2022,31(9):1824-1837.
APA	Wei, Fangli.,Wang, Shuai.,Fu, Bojie.,Wang, Lanhui.,Zhang, Wenmin.,...&Fensholt, Rasmus.(2022).Divergent trends of ecosystem-scale photosynthetic efficiency between arid and humid lands across the globe.GLOBAL ECOLOGY AND BIOGEOGRAPHY,31(9),1824-1837.
MLA	Wei, Fangli,et al."Divergent trends of ecosystem-scale photosynthetic efficiency between arid and humid lands across the globe".GLOBAL ECOLOGY AND BIOGEOGRAPHY 31.9(2022):1824-1837.