NWIPB OpenIR
Diurnal and Seasonal Variations in the Net Ecosystem CO2 Exchange of a Pasture in the Three-River Source Region of the Qinghai-Tibetan Plateau
Wang, Bin1,2; Jin, Haiyan1; Li, Qi3; Chen, Dongdong3; Zhao, Liang3; Tang, Yanhong4; Kato, Tomomichi5; Gu, Song6
2017-01-27
Source PublicationPLOS ONE
Volume12Issue:1
SubtypeArticle
AbstractCarbon dioxide (CO2) exchange between the atmosphere and grassland ecosystems is very important for the global carbon balance. To assess the CO2 flux and its relationship to environmental factors, the eddy covariance method was used to evaluate the diurnal cycle and seasonal pattern of the net ecosystem CO2 exchange (NEE) of a cultivated pasture in the Three-River Source Region (TRSR) on the Qinghai-Tibetan Plateau from January 1 to December 31, 2008. The diurnal variations in the NEE and ecosystem respiration (R-e) during the growing season exhibited single-peak patterns, the maximum and minimum CO2 uptake observed during the noon hours and night; and the maximum and minimum R-e took place in the afternoon and early morning, respectively. The minimum hourly NEE rate and the maximum hourly R-e rate were -7.89 and 5.03 mu mol CO2 m(-2) s(-1), respectively. The NEE and R-e showed clear seasonal variations, with lower values in winter and higher values in the peak growth period. The highest daily values for C uptake and R-e were observed on August 12 (-2.91 g C m(-2) d(-1)) and July 28 (5.04 g C m(-2) day(-1)), respectively. The annual total NEE and R-e were -140.01 and 403.57 g C m(-2) year(-1), respectively. The apparent quantum yield (alpha) was -0.0275 mu mol mu mol(-1) for the entire growing period, and the alpha values for the pasture's light response curve varied with the leaf area index (LAI), air temperature (T-a), soil water content (SWC) and vapor pressure deficit (VPD). Piecewise regression results indicated that the optimum T-a and VPD for the daytime NEE were 14.1 degrees C and 0.65 kPa, respectively. The daytime NEE decreased with increasing SWC, and the temperature sensitivity of respiration (Q(10)) was 3.0 during the growing season, which was controlled by the SWC conditions. Path analysis suggested that the soil temperature at a depth of 5 cm (T-soil) was the most important environmental factor affecting daily variations in NEE during the growing season, and the photosynthetic photon flux density (PPFD) was the major limiting factor for this cultivated pasture.
WOS HeadingsScience & Technology
DOI10.1371/journal.pone.0170963
WOS KeywordCARBON-DIOXIDE EXCHANGE ; PERENNIAL GRASS MIXTURES ; LEYMUS-CHINENSIS STEPPE ; WATER-VAPOR EXCHANGE ; ALPINE MEADOW ; INNER-MONGOLIA ; SOIL RESPIRATION ; TEMPERATURE ; CHINA ; FLUXES
Indexed BySCI
Language英语
Funding OrganizationNational Natural Science Foundation of China(31570478) ; State's Key Project of Research and Development Plan(2016YFC0501905) ; Scientific Research Fund of the Second Institute of Oceanography, SOA(JG1506) ; State Key Laboratory of the Grassland Agro-ecosystems Open Projects Fund(SKLGAE201506)
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000396211400020
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://210.75.249.4/handle/363003/6785
Collection中国科学院西北高原生物研究所
Affiliation1.State Ocean Adm, Inst Oceanog 2, Key Lab Marine Ecosyst & Biogeochem, Hangzhou, Zhejiang, Peoples R China
2.Qiqihar Univ, Coll Life Sci & Agr & Forestry, Qiqihar, Peoples R China
3.Chinese Acad Sci, Northwest Plateau Inst Biol, Xining, Peoples R China
4.Natl Inst Environm Studies, Tsukuba, Ibaraki, Japan
5.Univ Tsukuba, Doctoral Program Biol Sci, Tsukuba, Ibaraki, Japan
6.Nankai Univ, Coll Life Sci, Tianjin, Peoples R China
Recommended Citation
GB/T 7714
Wang, Bin,Jin, Haiyan,Li, Qi,et al. Diurnal and Seasonal Variations in the Net Ecosystem CO2 Exchange of a Pasture in the Three-River Source Region of the Qinghai-Tibetan Plateau[J]. PLOS ONE,2017,12(1).
APA Wang, Bin.,Jin, Haiyan.,Li, Qi.,Chen, Dongdong.,Zhao, Liang.,...&Gu, Song.(2017).Diurnal and Seasonal Variations in the Net Ecosystem CO2 Exchange of a Pasture in the Three-River Source Region of the Qinghai-Tibetan Plateau.PLOS ONE,12(1).
MLA Wang, Bin,et al."Diurnal and Seasonal Variations in the Net Ecosystem CO2 Exchange of a Pasture in the Three-River Source Region of the Qinghai-Tibetan Plateau".PLOS ONE 12.1(2017).
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
[Wang, Bin]'s Articles
[Jin, Haiyan]'s Articles
[Li, Qi]'s Articles
Baidu academic
Similar articles in Baidu academic
[Wang, Bin]'s Articles
[Jin, Haiyan]'s Articles
[Li, Qi]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Wang, Bin]'s Articles
[Jin, Haiyan]'s Articles
[Li, Qi]'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.