IGSNRR OpenIR
Photosynthetic Carbon Isotope Discrimination and Effects on Daytime NEE Partitioning in a Subtropical Mixed Conifer Plantation
Chen, Changhua1,2; Wei, Jie1; Wen, Xuefa1,2; Sun, Xiaomin1,2; Guo, Qingjun2,3
2019-07-15
Source PublicationAGRICULTURAL AND FOREST METEOROLOGY
ISSN0168-1923
Volume272Pages:143-155
Corresponding AuthorWen, Xuefa(wenxf@igsnrr.ac.cn) ; Sun, Xiaomin(sunxm@igsnrr.ac.cn)
AbstractIsoflux-based isotopic flux partitioning (isoflux-based IFP) separates net ecosystem exchange flux (NEE) into net photosynthesis (F-A) and nonfoliar respiration (F-NR), and avoids the spurious correlation of component fluxes found in statistical flux partitioning. Canopy photosynthetic discrimination (Delta(canopy)) is a key variable in isoflux-based IFP, but it ignores diffusional and respiratory fractionations, with unclear consequences for isoflux-based IFP. We used three versions of the Farquhar model (Delta(classical), Delta(diffusion), and Delta(simple)) to estimate Delta(canopy) based on in-situ measurements of CO2 isotope ratios and flux during a dry period (I; DOY 205-219, 2015) and a humid period (II; DOY 285-299, 2015) in a subtropical mixed conifer plantation. We found no significant differences in Delta(canopy) between Delta(classical) and Delta(diffusion) which ignored respiratory fractionations during photorespiration and dark respiration. The average differences between Delta(classical) and Delta(simple), which ignored respiratory and diffusional fractionations across the leaf boundary layer and mesophyll, were 2.88 +/- 2.34 parts per thousand and 2.16 +/- 2.18 parts per thousand for the two periods. Similarly, there were no significant differences in F-A with isoflux-based IFP using Delta(classical) and Delta(diffusion) to obtain Delta(canopy); F-A using Delta(simple) was 102 and 117% higher than that using Delta(classical) for the dry and humid periods. Moreover, using Delta(classical) and Delta(diffusion) captured the reduction in daytime respiration during the dry period; this may be associated with the Kok effect and seasonal drought. Sensitivity analysis showed that changes in mesophyll and stomatal conductances of +/- 50% resulted in > 15% change in F-A. Diffusional fractionations in mesophyll and stoma are critical limitations to isoflux-based IFP, while photorespiratory fractionation is an unignorable component of Delta(canopy) and isoflux-based IFP.
KeywordCarbon isotope Photosynthetic discrimination Isotopic flux partitioning Isotope ratio infrared spectroscopy Eddy covariance
DOI10.1016/j.agrformet.2019.03.027
WOS KeywordMESOPHYLL CONDUCTANCE ; TEMPERATURE RESPONSE ; C-13 DISCRIMINATION ; ECOSYSTEM EXCHANGE ; GAS-EXCHANGE ; CO2 EXCHANGE ; DIURNAL-VARIATION ; FAGUS-SYLVATICA ; REGIONAL SCALES ; WATER-VAPOR
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2017YFC0503904] ; National Natural Science Foundation of China[41830860] ; National Natural Science Foundation of China[31470500] ; National Natural Science Foundation of China[41671257]
Funding OrganizationNational Key Research and Development Program of China ; National Natural Science Foundation of China
WOS Research AreaAgriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS SubjectAgronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS IDWOS:000469158400013
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/58961
Collection中国科学院地理科学与资源研究所
Corresponding AuthorWen, Xuefa; Sun, Xiaomin
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modelling, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Ctr Environm Remediat, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Chen, Changhua,Wei, Jie,Wen, Xuefa,et al. Photosynthetic Carbon Isotope Discrimination and Effects on Daytime NEE Partitioning in a Subtropical Mixed Conifer Plantation[J]. AGRICULTURAL AND FOREST METEOROLOGY,2019,272:143-155.
APA Chen, Changhua,Wei, Jie,Wen, Xuefa,Sun, Xiaomin,&Guo, Qingjun.(2019).Photosynthetic Carbon Isotope Discrimination and Effects on Daytime NEE Partitioning in a Subtropical Mixed Conifer Plantation.AGRICULTURAL AND FOREST METEOROLOGY,272,143-155.
MLA Chen, Changhua,et al."Photosynthetic Carbon Isotope Discrimination and Effects on Daytime NEE Partitioning in a Subtropical Mixed Conifer Plantation".AGRICULTURAL AND FOREST METEOROLOGY 272(2019):143-155.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Chen, Changhua]'s Articles
[Wei, Jie]'s Articles
[Wen, Xuefa]'s Articles
Baidu academic
Similar articles in Baidu academic
[Chen, Changhua]'s Articles
[Wei, Jie]'s Articles
[Wen, Xuefa]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Chen, Changhua]'s Articles
[Wei, Jie]'s Articles
[Wen, Xuefa]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.