IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Disentangling Contributions of CO2 Concentration and Climate to Changes in Intrinsic Water-Use Efficiency in the Arid Boreal Forest in China's Altay Mountains
Xu, Guobao1,2,3; Liu, Xiaohong1,3; Belmecheri, Soumaya2; Chen, Tuo1; Wu, Guoju1; Wang, Bo1; Zeng, Xiaomin3; Wang, Wenzhi4
Corresponding AuthorLiu, Xiaohong(liuxh@lzb.ac.cn)
2018-10-01
Source PublicationFORESTS
ISSN1999-4907
Volume9Issue:10Pages:21
AbstractIntrinsic water-use efficiency (iWUE) is affected by the balance of photosynthetic rate, stomatal conductance, and climate, along with many other exogenous factors, such as the CO2 concentration in the atmosphere (CO2atm), nutrients, and water holding capacity of the soil. The relative contributions of CO2atm and climate to iWUE are still incompletely understood, particularly for boreal forests where the climate is undergoing unprecedented warming. We combined C-13 and O-18 in tree rings from the Siberian larch (Larix sibirica Ledeb.) in Northwestern China's Altay Mountains, which receives 190 mm in annual precipitation, to detect the drivers of long-term iWUE changes and their time-varying contributions over the past 222 years. A climate optimization approach was used to isolate the influence of climate from CO2atm influence on iWUE. We found that iWUE increased about 33.6% from 1790 to 2011, and rising CO2atm contributed 48.8% to this iWUE increase. The contributions of CO2atm and climate (drought conditions) varied during the study period 1790-2011. From 1790 to 1876, the climate was the most important factor contributing to the changes in iWUE. From 1877 to 1972, CO2atm was the main contributor; however, after 1973, the climate was again the dominant contributor to the increase in iWUE, especially during 1996-2011. During the period 1996-2011, climate substantially (83%) contributed to the iWUE increase. Our findings imply that, in the boreal forest in Northwestern China's arid region, iWUE experienced three changes: (1) the climate dominating from 1790 to 1876; (2) CO2atm dominating from 1877 to 1972, and (3) climate dominating again during the past four decades. We observed that the relationships between iWUE and tree-ring width shifted from positive to negative from 1996 onwards. These relationship changes indicate that CO2atm-mediated effects of increasing iWUE on tree growth are counteracted by climatic drought stress and iWUE increase cannot counter the stress from drought on tree growth in China's arid boreal forest.
KeywordC-13 and O-18 intrinsic water-use efficiency larch tree rings vapor pressure deficit
DOI10.3390/f9100642
Indexed BySCI
WOS KeywordCARBON-ISOTOPE DISCRIMINATION ; TREE-RING DELTA-O-18 ; STABLE-ISOTOPES ; ATMOSPHERIC CO2 ; STOMATAL CONDUCTANCE ; NORTHWESTERN CHINA ; HINGGAN MOUNTAINS ; EUROPEAN FORESTS ; ELEVATED CO2 ; GROWTH
Language英语
Funding ProjectNational Natural Science Foundation of China[41501049] ; National Natural Science Foundation of China[41871030] ; National Natural Science Foundation of China[41721091] ; Self-determination Project of the State Key Laboratory of Cryospheric Sciences[SKLCS-ZZ-2018] ; foundation of Light of West China Program of Chinese Academy of Sciences ; Youth Innovation Promotion Association[2016372] ; Chinese Academy of Sciences ; fundamental Research funds for the Central Universities[GK201801007] ; China Scholarship Council
WOS Research AreaForestry
WOS SubjectForestry
WOS IDWOS:000448550700061
Funding OrganizationNational Natural Science Foundation of China ; Self-determination Project of the State Key Laboratory of Cryospheric Sciences ; foundation of Light of West China Program of Chinese Academy of Sciences ; Youth Innovation Promotion Association ; Chinese Academy of Sciences ; fundamental Research funds for the Central Universities ; China Scholarship Council
PublisherMDPI
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/24233
Collection山地表生过程与生态调控重点实验室
Corresponding AuthorLiu, Xiaohong
Affiliation1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Gansu, Peoples R China
2.Univ Arizona, Lab Tree Ring Res, Tucson, AZ 85721 USA
3.Shaanxi Normal Univ, Sch Geog & Tourism, Xian 710119, Shaanxi, Peoples R China
4.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China
Recommended Citation
GB/T 7714
Xu, Guobao,Liu, Xiaohong,Belmecheri, Soumaya,et al. Disentangling Contributions of CO2 Concentration and Climate to Changes in Intrinsic Water-Use Efficiency in the Arid Boreal Forest in China's Altay Mountains[J]. FORESTS,2018,9(10):21.
APA Xu, Guobao.,Liu, Xiaohong.,Belmecheri, Soumaya.,Chen, Tuo.,Wu, Guoju.,...&Wang, Wenzhi.(2018).Disentangling Contributions of CO2 Concentration and Climate to Changes in Intrinsic Water-Use Efficiency in the Arid Boreal Forest in China's Altay Mountains.FORESTS,9(10),21.
MLA Xu, Guobao,et al."Disentangling Contributions of CO2 Concentration and Climate to Changes in Intrinsic Water-Use Efficiency in the Arid Boreal Forest in China's Altay Mountains".FORESTS 9.10(2018):21.
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