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IAEA’s MIBA Project and Stable Isotope Studies for USCCC
Guanghui Lin Institute of Botany, CAS, Beijing, China June 30, 2005
IAEAs MIBA Project and Stable Isotope Studies for USCCC Guanghui - - PowerPoint PPT Presentation
IAEAs MIBA Project and Stable Isotope Studies for USCCC Guanghui - - PowerPoint PPT Presentation
IAEAs MIBA Project and Stable Isotope Studies for USCCC Guanghui Lin Institute of Botany, CAS, Beijing, China June 30, 2005 Outline The MIBA network overview USCCC contributions to MIBA Stable isotope studies for USCCC The MIBA
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The MIBA network
MIBA: Moisture Isotopes in the Biosphere and Atmosphere Established at a meeting in Vienna in May 2004 Building on GNIP (& GNIR) in collaboration with WMO Primary aim - to facilitate acquisition of data on stable isotopes in biospheric and atmospheric water Funded mainly by IAEA (for minimum 10 years)
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MIBA objectives
Regional scale hydrological budgets The partitioning of annual carbon fluxes The development of new global change indicators Ecosystem functioning Interpretations of 13C and 18O analyses in
- rganic matter
The validation of general circulation models Past global responses to climate change
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Idealized distribution- 100 sites: 90 continental, 10 oceanic (water vapor)
15 15 15 15 15 15
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MIBA sites so far (May 2005)
ht t p: / / w w w
- naw
- eb. i aea. or g/ napc/ i h/ M
I BA_w eb/ m i ba. ht m
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IAEA Membership
- P. Aggarwal, Head, Isotope Hydrology Section IAEA
- D. Yakir (Israel; Chair), G. Farquhar (Australia), A.
Henderson-Sellers (Australia), L. Flanagan (Canada),
- F. Longstaffe (Canada), G. Lin (China), J. Santruek
(Czech Republic), P. Ciais (France), G. Hoffman (France), W. Stichler (Germany), H. Meijer (the Netherlands), R. Siegwolf (Switzerland), N. Buchmann (Switzerland), H. Griffiths (UK), J. Berry (USA). P. Tans (USA), L. Sternberg (USA), T. Dawson (USA), J. White (USA), and Brent Helliker (USA)
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IMPLENETATION OF MIBA PROJECT The IAEA will facilitate the work of MIBA group Participants of worldwide will collect leaf, stem, soil and vapor water samples biweekly for 10 years; MIBA group will assist in providing training and logistics according to needs; The IAEA isotope laboratory and that of several group members will provide free isotopic analyses;
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Where: Preferably at flux-net-tower sites or similar When: year around for evergreen forests or during the vegetative period of temperature forests or grasslands How often: Every two weeks
How: Fill the sample tubes and seal as soon as possible
What time of the day: between 12:00 and 16:00 (solar time) Weather conditions: No rain, no water on the leaves and stems
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USCCC contributions to MIBA
Routinely sampling and analyzing vapour isotopic compositions in Beijing suburb (weekly) Sampling soil, stem and leaf waters bi-weekly for δ18O analyses in grass, desert, plantation, crop field, forest ecosystem across China Extracting water samples from the above specimen for stable isotope analyses (in IAEA Isotope lab) Organizing at least one network annual meeting for participating members (2007 or 2008)
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R
- of m
- i st ur e sam
pl i ng at I B_C AS
St ar t ed on Apr . 19, 04, and w i l l r epeat w eekl y. . . .
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SILEER
(Stable Isotope Lab for Ecological and Environmental Research)
I AEA’s desi gnat ed i sot ope l ab f or M I BA pr oj ect i n C hi na
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MIBA_China Sites
CN_10, 11 CN_12 CN_8, 9 CN_6 CN_7 CN_4, 5 CN_1, 2, 3
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MIBA_China Project Management Project Investigators:
- Prof. Shuqing An
- Prof. Xudong Zhang
- Prof. Bo Li
- Prof. Zhiqiang Zhang
- Dr. Guanghui Lin
- Dr. Guangsheng Zhou
Project Coordinator: Dr. Guanghui Lin (010-82593840;ghlin@ibcas.ac.cn) Project Assistant: Ms. Ying Xiong (010-62599059;yxiong2003@ibcas.ac.cn) Project technical support: Mr. Leyi Li (010-62836277; lileyi@ibcas.ac.cn)
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A possible manuscript
Title: Relationship between isotopic signals and ecosystem water use efficiency in selected ecosystems of China Authors: All USCCC site PIs, key associates/students Data needed:
A few weeks of NEE and ET data at each site Isotopic ratios of leaf and water samples (IAEA) δ13C of ecosystem or soil respired CO2 (selected sites)
Targeted journal: PCE or New Phytologist
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CO2 Trapping System
For δ13Cr ecosystem WUE For NEE partition:NEEA+R; R=RA+RH
Xi l i nhot si t e ( Fenced gr assl and)
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y = 4565. 3x - 21. 206 R
2 = 0. 9595
- 14. 0
- 13. 0
- 12. 0
- 11. 0
- 10. 0
- 9. 0
- 8. 0
- 0. 0018
- 0. 002
- 0. 0022
- 0. 0024
- 0. 0026
- 0. 0028
- 0. 003
1/ CO
2( m
- l μm
- l
- 1)
δ13C( ‰)
y = 5779. 7x - 24. 66 R
2 = 0. 9586
- 13
- 12
- 11
- 10
- 9
- 8
- 0. 002
- 0. 0022
- 0. 0024
- 0. 0026
- 0. 0028
- 0. 003
1/ CO
2( m
- l μm
- l
- 1)
δ13C( ‰)
August 2004 Sept em ber 2005
Sun, C hen and Li n, unpubl i shed dat a
δ13C
r W U E
e
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Vapor Trapping System (for ET partition)
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Yepez et al . ( 2003)
M esqui t e w
- odl and, U
SA
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Evapotranspiration at mesquite site, 2001
Yepez et al 2003 Yepez et al 2003
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