干旱区生态环境知识资源中心(Arid): Drought sensitivity of vegetation photosynthesis along the aridity gradient in northern China

Arid

DOI	10.1016/j.jag.2021.102418
	Drought sensitivity of vegetation photosynthesis along the aridity gradient in northern China
	Xu, Hao-jie; Wang, Xin-ping; Zhao, Chuan-yan
通讯作者	Xu, HJ (corresponding author), Lanzhou Univ, Key Lab Grassland Livestock Ind Innovat, State Key Lab Grassland Agroecosyst,Minist Educ,C, Engn Res Ctr Grassland Ind,Minist Agr & Rural Aff, Lanzhou 730020, Peoples R China.
来源期刊	INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
ISSN	1569-8432
EISSN	1872-826X
出版年	2021
卷号	102
英文摘要	Satellite remotely sensed solar-induced chlorophyll fluorescence (SIF) enjoys the intrinsic superiority to the detection of ecosystem-level photosynthetic capacity under drought stress, yet little is known about how drought accumulation and legacy effects shape vegetation photosynthetic activities as approximated by SIF. Hence, we quantified drought sensitivity of vegetation photosynthesis (DSVP) by evaluating the degree and time to which SIF responded to prolonged and previous droughts with standardized precipitation evapotranspiration index (SPEI). Divergent SIF responses to SPEI across bioclimatic zones were examined in northern China for the period of 2000 to 2017. Our results suggested that the accumulation, legacy and their combined effects spread for 9.2, 25.0 and 44.3% of the vegetated land, respectively. The dominant lag and accumulation time of SIF responses to SPEI was 9.1 and 10.5 months for all biomes, respectively. In general, patterns of the cumulative and lagged effects along an aridity gradient were similar, displaying quicker and stronger SIF responses to SPEI in regions with a lower aridity index value, but the changing rate of magnitude and time duration varied among and within biomes. Besides, we detected a nonlinear response to increasing dryness in DSVP as reflected by multiple trend breaks, which were caused by the differences among vegetation types and their drought adaptation and vulnerability. Semi-arid ecosystems were found to be highly sensitive to drought, especially in the farmingpastoral zone with an aridity index value within 0.3-0.4. At the biome level, grasslands responded to prolonged and previous droughts quicker and stronger than croplands and deserts did, whereas forests were the least responsive. This study emphasizes the demand for a prompt assessment of drought impacts on vegetation photosynthesis in a drying climate, and to focus on regions where increasing dryness leads to substantial declines in photosynthetic capacity under global warming.
英文关键词	Solar-induced chlorophyll fluorescence Drought Cumulative and lagged effects Water availability Biome type
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000700848100001
WOS关键词	ECOSYSTEMS ; GROWTH ; INDEX ; RESISTANCE
WOS类目	Remote Sensing
WOS研究方向	Remote Sensing
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363613
作者单位	[Xu, Hao-jie; Zhao, Chuan-yan] Lanzhou Univ, Key Lab Grassland Livestock Ind Innovat, State Key Lab Grassland Agroecosyst,Minist Educ,C, Engn Res Ctr Grassland Ind,Minist Agr & Rural Aff, Lanzhou 730020, Peoples R China; [Wang, Xin-ping] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Xu, Hao-jie,Wang, Xin-ping,Zhao, Chuan-yan. Drought sensitivity of vegetation photosynthesis along the aridity gradient in northern China[J]. 兰州大学,2021,102.
APA	Xu, Hao-jie,Wang, Xin-ping,&Zhao, Chuan-yan.(2021).Drought sensitivity of vegetation photosynthesis along the aridity gradient in northern China.INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION,102.
MLA	Xu, Hao-jie,et al."Drought sensitivity of vegetation photosynthesis along the aridity gradient in northern China".INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION 102(2021).