PMID- 32146509
OWN - NLM
STAT- MEDLINE
DCOM- 20200617
LR  - 20200617
IS  - 1432-1254 (Electronic)
IS  - 0020-7128 (Linking)
VI  - 64
IP  - 7
DP  - 2020 Jul
TI  - Carbon and water fluxes in an alpine steppe ecosystem in the Nam Co area of the 
      Tibetan Plateau during two years with contrasting amounts of precipitation.
PG  - 1183-1196
LID - 10.1007/s00484-020-01892-2 [doi]
AB  - Carbon and water fluxes and their interactions with climate drivers in alpine 
      grasslands on the Tibetan Plateau are poorly understood. This lack of 
      understanding is particularly evident for the alpine steppe in the Nam Co area of 
      the hinterland on the Tibetan Plateau, which is vulnerable and exceedingly 
      sensitive to climate change. In this study, eddy covariance (EC) measurements of 
      carbon dioxide (CO(2)) and water fluxes were carried out in this region during 
      the growing season of 2008 and 2009, with contrasting hydrological conditions. 
      The results show that (1) the monthly patterns of carbon and water fluxes 
      differed markedly in the two years; the total respiration (Re), net ecosystem 
      carbon dioxide exchange (NEE) and gross primary productivity (GPP) were 
      181.6 +/- 11.5, - 62.6 +/- 10.8, and 244.2 +/- 9.6 and 144.6 +/- 12.0, - 32.4 +/- 11.7, and 
      176.9 +/- 12.3 g C m(-2) during the growing seasons in 2008 and 2009; meanwhile, 
      the cumulative evapotranspiration (ET) values were 503.1 +/- 13.5 and 
      387.3 +/- 8.2 mm during the growing season in 2008 and 2009, respectively. The 
      cumulative carbon fluxes and ET were both higher in the wetter 2008 than in the 
      drier 2009, consistent with the precipitation results. (2) Soil water content 
      (SWC) played a paramount role in the variations in carbon fluxes (NEE, GPP, and 
      Re) and ET during the vegetative period over the two years. As a result, the 
      alpine steppe ecosystem was water-limited. (3) Water stress caused by the low 
      surface soil water content significantly depressed photosynthesis and ET during 
      the daytime in July and August. (4) Water use efficiency (WUE) had a negative 
      relationship with SWC during the growing season in these two years, and the WUE 
      increased during drought.
FAU - Wang, Yuyang
AU  - Wang Y
AD  - Chinese Academy of Sciences, Key Laboratory of Tibetan Environment Changes and 
      Land Surface Processes, Institute of Tibetan Plateau Research, Beijing, 100101, 
      China.
AD  - University of Chinese Academy of Sciences, Beijing, 100049, China.
FAU - Zhu, Zhikun
AU  - Zhu Z
AD  - School of Science, Shandong Jianzhu University, Jinan, 250101, China.
FAU - Ma, Yaoming
AU  - Ma Y
AD  - Chinese Academy of Sciences, Key Laboratory of Tibetan Environment Changes and 
      Land Surface Processes, Institute of Tibetan Plateau Research, Beijing, 100101, 
      China. ymma@itpcas.ac.cn.
AD  - University of Chinese Academy of Sciences, Beijing, 100049, China. 
      ymma@itpcas.ac.cn.
AD  - Chinese Academy of Sciences, CAS Center for Excellence in Tibetan Plateau Earth 
      Sciences, Beijing, 100101, China. ymma@itpcas.ac.cn.
FAU - Yuan, Ling
AU  - Yuan L
AD  - Chinese Academy of Sciences, Key Laboratory of Tibetan Environment Changes and 
      Land Surface Processes, Institute of Tibetan Plateau Research, Beijing, 100101, 
      China.
AD  - University of Chinese Academy of Sciences, Beijing, 100049, China.
LA  - eng
GR  - XDA20060101/Strategic Priority Research Program of Chinese Academy of Sciences/
GR  - 91837208/National Natural Science Foundation of China/
GR  - 41661144043/National Natural Science Foundation of China/
GR  - 91637312/National Natural Science Foundation of China/
GR  - QYZDJ-SSW-DQC019/Chinese Academy of Sciences/
GR  - Dragon 4 id. 32070/ESA-MOST Dragon 4 project CLIMATE-TPE/
GR  - X18075Z/the Doctoral Research Fund of Shandong Jianzhu Universtiy/
PT  - Journal Article
DEP - 20200307
PL  - United States
TA  - Int J Biometeorol
JT  - International journal of biometeorology
JID - 0374716
RN  - 059QF0KO0R (Water)
RN  - 142M471B3J (Carbon Dioxide)
SB  - IM
MH  - Carbon Cycle
MH  - Carbon Dioxide
MH  - *Ecosystem
MH  - Grassland
MH  - Seasons
MH  - Tibet
MH  - *Water
OTO - NOTNLM
OT  - Alpine steppe ecosystem
OT  - Carbon flux
OT  - Precipitation
OT  - Tibetan Plateau
OT  - Water flux
EDAT- 2020/03/09 06:00
MHDA- 2020/06/18 06:00
CRDT- 2020/03/09 06:00
PHST- 2019/06/01 00:00 [received]
PHST- 2020/03/02 00:00 [accepted]
PHST- 2020/02/28 00:00 [revised]
PHST- 2020/03/09 06:00 [pubmed]
PHST- 2020/06/18 06:00 [medline]
PHST- 2020/03/09 06:00 [entrez]
AID - 10.1007/s00484-020-01892-2 [pii]
AID - 10.1007/s00484-020-01892-2 [doi]
PST - ppublish
SO  - Int J Biometeorol. 2020 Jul;64(7):1183-1196. doi: 10.1007/s00484-020-01892-2. 
      Epub 2020 Mar 7.