Sensitivity of alpine grassland carbon balance to interannual variability in climate and atmospheric CO2 on the Tibetan Plateau during the last century

doi:10.1104/pp.17.00021

	Sensitivity of alpine grassland carbon balance to interannual variability in climate and atmospheric CO2 on the Tibetan Plateau during the last century
	Lin, Xiaohui 1; Han, Pengfei 2; Zhang, Wen ; Wang, Guocheng
	2017
发表期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
卷号	154 页码:23-32
摘要	As the Earth's third pole, the Tibetan Plateau ecosystems are extremely sensitive to climate change. However, the interannual climate sensitivity of the carbon balance of the Tibetan Plateau alpine grassland has not been well quantified under changes in the climate and atmospheric CO2 concentration. Here, we used a process-based biogeochemistry model, CENTURY, to evaluate the sensitivity of the carbon balance to climate change and rising atmospheric CO2 concentration on the Tibetan Plateau grassland during the period 1901-2010. We show that the magnitude of the increase in net primary production (NPP) (0.31 g cm(-2) yr(-1)) was larger than that in heterotrophic respiration (Rh) (0.26 g Cm-2 yr(-1)), and thus indicate that the Tibetan Plateau grassland acted as a net carbon sink of 7.45 Tg C yr(-1) from 1901 to 2010. The spatiotemporal dynamics of carbon fluxes in the Tibetan Plateau grassland were primarily controlled by temperature, and positively correlated with precipitation and elevated CO2 concentration. The temperature sensitivities of NPP (gamma(Temp)(NPP)), Rh (gamma(Temp)(Rh)), and net ecosystem production (NEP, gamma(Temp)(NEP)) during the period 1961-2010 weakened by 16%, 17%, and 15%, respectively, compared with the period 1901-1960. By contrast, the precipitation sensitivities of these variables, i.e., gamma(Prec)(NPP), gamma(Prec)(Rh), and gamma(Prec)(NEP), strengthened by 46%, 67%, and 23%, respectively, from 1961 to 2010 compared with the 1901-1960 period. The continuing increase in atmospheric CO2 concentration tended to enhance the climate sensitivity of the carbon fluxes, by similar to 3% for hemp and 2%-4% for gamma(Prec), as a result of CO2 fertilization and water use efficiency improvement. The climate sensitivity heterogeneity revealed that interannual variation in Rh is more likely to be amplified than NPP or NEP. The findings imply that climate change exerts a strong influence on the carbon dynamics of the alpine ecosystem in the Tibetan Plateau, and this could further modulate the carbon balance depending on the magnitude of different carbon component fluxes. Our study suggests that changes in the climate sensitivity of carbon dynamics should be considered to further quantify the carbon dynamics in this climate-sensitive region.
关键词	Carbon balance Climate sensitivity CO2 fertilization Alpine grassland
学科领域	Plant Sciences
DOI	10.1104/pp.17.00021
收录类别	SCI
语种	英语
WOS关键词	NET PRIMARY PRODUCTION ; PERMAFROST CARBON ; GROWING-SEASON ; TERRESTRIAL ECOSYSTEMS ; SOIL RESPIRATION ; PLANT-GROWTH ; TEMPERATURE ; BIOMASS ; DYNAMICS ; DIOXIDE
WOS记录号	WOS:000417083900016
出版者	ELSEVIER
文献子类	Article
出版地	AMSTERDAM
EISSN	1872-6364
资助机构	Postdoctoral Science Foundation of LASG Dean [7-091162] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31370492, 41590870]
作者邮箱	pfhan@mail.iap.ac.cn
作品OA属性	Bronze, Green Published
引用统计	被引频次：30[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/22089
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 3.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Lin, Xiaohui,Han, Pengfei,Zhang, Wen,et al. Sensitivity of alpine grassland carbon balance to interannual variability in climate and atmospheric CO2 on the Tibetan Plateau during the last century[J]. GLOBAL AND PLANETARY CHANGE,2017,154:23-32.
APA	Lin, Xiaohui,Han, Pengfei,Zhang, Wen,&Wang, Guocheng.(2017).Sensitivity of alpine grassland carbon balance to interannual variability in climate and atmospheric CO2 on the Tibetan Plateau during the last century.GLOBAL AND PLANETARY CHANGE,154,23-32.
MLA	Lin, Xiaohui,et al."Sensitivity of alpine grassland carbon balance to interannual variability in climate and atmospheric CO2 on the Tibetan Plateau during the last century".GLOBAL AND PLANETARY CHANGE 154(2017):23-32.

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