Multiple-scale negative impacts of warming on ecosystem carbon use efficiency across the Tibetan Plateau grasslands

doi:10.1111/geb.13224

	Multiple-scale negative impacts of warming on ecosystem carbon use efficiency across the Tibetan Plateau grasslands
	Chen, Ning 2,3; Zhang, Yangjian 2,4,5; Zhu, Juntao 2; Cong, Nan 2; Zhao, Guang 2; Zu, Jiaxing 6; Wang, Zhipeng 2,7; Huang, Ke 2; Wang, Li 8; Liu, Yaojie 1
刊名	GLOBAL ECOLOGY AND BIOGEOGRAPHY
	2020-11-27
页码	16
关键词	carbon use efficiency multiple scale observations negative effects nonlinear responses Tibetan Plateau warming
ISSN号	1466-822X
DOI	10.1111/geb.13224
通讯作者	Zhang, Yangjian(zhangyj@igsnrr.ac.cn) ; Huang, Ke(huangk.13b@igsnrr.ac.cn)
英文摘要	Aim Ecosystem carbon use efficiency (CUEe) is a core parameter of ecosystem process models, but its relationships with climate are still uncertain, especially for ecosystems with harsh environments. Large inconsistencies in climate impacts on the CUEe have been reported among various spatial scales. The goal of this study was to examine whether warming promotes or restricts the CUEe and whether the CUEe responds to a warming gradient in a linear or nonlinear manner. Location Tibetan Plateau. Time period 2000-2018. Major taxa studied Alpine grassland ecosystem. Methods We integrated multiple-source data of carbon fluxes and CUEe, including warming experiments at a site scale, eddy covariance observations at a landscape scale and synthesized warming experiments and ecosystem process models at a regional scale. Next, we deployed a statistical model to examine the warming impacts on the CUEe across scales; the effects of biotic and abiotic factors on the CUEe and its components were summarized based on the results of standardized major axis tests and routines, structural equation modelling and nonlinear models. Results This study reported a suppressive warming impact on the CUEe, which followed a nonlinear curve with severe inhibition in the high-level warming treatment. With a warming threshold of 1.5-2.0 degrees C, CUEe response patterns transitioned from no change to a significant decrease. The restriction effects can be ascribed to the joint adverse and asymmetric effects of warming on CUEe components under multiple-level warming. Warming-modified relationships among CUEe components and the nonlinear effects of biotic and abiotic factors led to the nonlinear responses of CUEe to warming. Main conclusions This study revealed suppressive and nonlinear effects of warming on the CUEe, including especially dramatic CUEe decreases with high-level warming. These findings are critical for optimizing model parameters and improving predictions of the carbon sequestration capacity of alpine grasslands.
资助项目	National Natural Science Foundation of China[31500360] ; National Natural Science Foundation of China[31600362] ; National Natural Science Foundation of China[41571195] ; National Natural Science Foundation of China[41725003] ; National Natural Science Foundation of China[41801083] ; National Natural Science Foundation of China[41901131] ; National Natural Science Foundation of China[41991234] ; National Key Research AMP; Development Program[2019YFA0607302] ; Science Planning of the Tibet Autonomous Region[Y66M2701AL]
WOS关键词	SOIL RESPIRATION ; ALPINE MEADOW ; DIFFERENTIAL RESPONSES ; CLIMATE VARIABILITY ; PLANT-PRODUCTION ; CO2 EFFLUX ; FLUXES ; PRECIPITATION ; TEMPERATURE ; PHOTOSYNTHESIS
WOS研究方向	Environmental Sciences & Ecology ; Physical Geography
语种	英语
出版者	WILEY
WOS记录号	WOS:000592431600001
资助机构	National Natural Science Foundation of China ; National Key Research AMP; Development Program ; Science Planning of the Tibet Autonomous Region
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/156419]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhang, Yangjian; Huang, Ke
作者单位	1.Nanjing Univ, Int Inst Earth Syst Sci, Nanjing, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 3.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Wetland Ecol & Environm, Changchun, Peoples R China 4.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China 5.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China 6.Nanning Normal Univ, Key Lab Environm Change & Resources Use Beibu Gul, Minist Educ, Nanning, Peoples R China 7.Univ Chinese Acad Sci, Beijing, Peoples R China 8.Peking Univ, Coll Urban & Environm Sci, Shenzhen Grad Sch, Shenzhen, Peoples R China 9.Shenyang Agr Univ, Coll Agron, Shenyang, Peoples R China
推荐引用方式 GB/T 7714	Chen, Ning,Zhang, Yangjian,Zhu, Juntao,et al. Multiple-scale negative impacts of warming on ecosystem carbon use efficiency across the Tibetan Plateau grasslands[J]. GLOBAL ECOLOGY AND BIOGEOGRAPHY,2020:16.
APA	Chen, Ning.,Zhang, Yangjian.,Zhu, Juntao.,Cong, Nan.,Zhao, Guang.,...&Chen, Yao.(2020).Multiple-scale negative impacts of warming on ecosystem carbon use efficiency across the Tibetan Plateau grasslands.GLOBAL ECOLOGY AND BIOGEOGRAPHY,16.
MLA	Chen, Ning,et al."Multiple-scale negative impacts of warming on ecosystem carbon use efficiency across the Tibetan Plateau grasslands".GLOBAL ECOLOGY AND BIOGEOGRAPHY (2020):16.