Chin J Plan Ecolo ›› 2008, Vol. 32 ›› Issue (4): 961-966.doi: 10.3773/j.issn.1005-264x.2008.04.026

;

• Research Articles • Previous Articles     Next Articles

RECENT ADVANCES IN H218O ENRICHMENT IN LEAF WATER

WEN Xue-Fa; ZHANG Shi-Chun;SUN Xiao-Min; YU Gui-Rui   

  1. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
  • Online:2008-07-30 Published:2008-07-30
  • Contact: WEN Xue-Fa

Abstract: There is considerable interest in the use of atmospheric C18O16O and 18O16O as a tracer for resolving the role of
the terrestrial biosphere in the global carbon cycle. Leaf transpiration will result in the enrichment of the heavy H218O
isotopes. The δ18O of leaf water at the evaporating site in the stomatal cavity directly influences the C18O16O and 18O16O
exchanges, instead of that of the bulk leaf water. How to best quantify this enrichment effect remains an active area of
research. In the past, a closed form of the Craig-Gordon model was obtained by invoking the steady-state assumption (δ18O of
the transpired water is identical to δ18O of the xylem water). For the purpose of verification, the predictions of Craig-
Gordon model are compared with δ18O of the bulk leaf water after appropriate corrections for the Péclet effect. On small
time scales of minutes to hours, δ18O of the transpired water is variable in field conditions, implying that the steady
state assumption is invalid. Recently, in-situ δ18O and δD measurement technology has been developed that has potential for
improving our understanding of isotopic exchanges between the Earth’s surface and the atmosphere. The precision of hourly δ
18O and δD is comparable to the precision of mass spectrometry. It has the potential to improve prediction of δ18O of leaf
water at the evaporating site within the stomatal cavity for the temporal dynamics of atmospheric water vapor δ18O and the
δ18O of the transpired water, especially if its measurement is made in a non-destructive manner and on a continuous basis.
Because the isotopic flux of δ18O and δD is influenced by a similar set of biological and meteorological variables,
simultaneous observations of δ18O and δD will provide additional constraints on the hydrological and ecological processes
of the ecosystem. We review the theory and measurement techniques for the enrichment of H218O in leaves and focus on the
recently developed in-situ measurement technology and its potential for improving our understanding of H218O enrichment in
leaf water and C18O16O and 18O16O exchanges between the ecosystem and atmosphere.

No related articles found!
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
[1] LIU Jun;ZHAO Lan-Yong;FENG Zhen;ZHANG Mei-Rong;WU Yin-Feng. Optimization Selection of Genetic Transformation Regeneration System from Leaves of Dendranthema morifolium[J]. Chin Bull Bot, 2004, 21(05): 556 -558 .
[2] Luo Jian-ping and Ja Jing-fen. Structure and Function of Plant Oligosaceaharins[J]. Chin Bull Bot, 1996, 13(04): 28 -33 .
[3] YANG Qi-He SONG Song-Quan YE Wan-HuiYIN Shou-HuaT. Mechanism of Seed Photosensitivity and FactorsInfluencing Seed Photosensitivity[J]. Chin Bull Bot, 2003, 20(02): 238 -247 .
[4] CUI Yue-Hua;WANG Mao and SUN Ke-Lian. Morphological Study of Gutta-containing Cells in Eucommia ulmoides Oliv.[J]. Chin Bull Bot, 1999, 16(04): 439 -443 .
[5] CHEN Shao-Liang LI Jin-Ke BI Wang-Fu WANG Sha-Sheng. Genotypic Variation in Accumulation of Salt Ions, Betaine and Sugars in Poplar Under Conditions of Salt Stress[J]. Chin Bull Bot, 2001, 18(05): 587 -596 .
[6] . Advances in Research into Low-Phytic-Acid Mutants in Crops[J]. Chin Bull Bot, 2005, 22(04): 463 -470 .
[7] Cong Ma, Weiwen Kong. Research Progress in Plant Metacaspase[J]. Chin Bull Bot, 2012, 47(5): 543 -549 .
[8] Chang’en Tian, Yuping Zhou. Research Progress in Plant IQ Motif-containing Calmodulin-binding Proteins[J]. Chin Bull Bot, 2013, 48(4): 447 -460 .
[9] Huawei Xu, Dianyun Hou. Research Advances in Protein Transport into Chloroplasts in Plant Cell#br#[J]. Chin Bull Bot, 2018, 53(2): 264 -275 .
[10] Li Jiandong, Zheng Huiying. ?ber die Anwendung der Braun-Blanquet's Methode in der Steppen-Untersuchung[J]. Chin J Plan Ecolo, 1983, 7(3): 186 -203 .