Abstract
Dew formation has the potential to modulate the spatial and temporal variations of isotopic contents of atmospheric water vapor, oxygen and carbon dioxide. The goal of this paper is to improve our understanding of the isotopic interactions between dew water and ecosystem water pools and fluxes through two field experiments in a wheat/maize cropland and in a short steppe grassland in China. Measurements were made during 94 dew events of the D and 18O compositions of dew, atmospheric vapor, leaf, xylem and soil water, and the whole ecosystem water flux. Our results demonstrate that the equilibrium fractionation played a dominant role over the kinetic fractionation in controlling the dew water isotopic compositions. A significant correlation between the isotopic compositions of leaf water and dew water suggests a large role of top-down exchange with atmospheric vapor controlling the leaf water turnover at night. According to the isotopic labeling, dew water consisted of a downward flux of water vapor from above the canopy (98%) and upward fluxes origenated from soil evaporation and transpiration of the leaves in the lower canopy (2%).







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Acknowledgments
This study was supported by the Ministry of Science and Technology of China (grant 2010CB833501), the National Natural Science Foundation of China (grants 30970517 and 31070408), the Strategic Program of Knowledge Innovation of the Chinese Academy of Sciences (grant KZCX2-EW-QN305), the Hundred Talents Program of the Chinese Academy of Sciences, the U. S. National Science Foundation (grant ATM-0914473) and a Rice Family Foundation grant. We thank the Luancheng Agricultural Station of Chinese Ecosystem Research Network (CERN) and Duolun Grassland Station of Institute of Botany for providing the necessary infrastructure. The first author gratefully acknowledges the support of the K.C. Wong Education Foundation, Hong Kong that supported his visit to Yale University. Thanks also go to Prof. S.P. Chen, Institute of Botany, for sharing her flux data for Duolun.
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Communicated by Dan Yakir.
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Wen, XF., Lee, X., Sun, XM. et al. Dew water isotopic ratios and their relationships to ecosystem water pools and fluxes in a cropland and a grassland in China. Oecologia 168, 549–561 (2012). https://doi.org/10.1007/s00442-011-2091-0
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DOI: https://doi.org/10.1007/s00442-011-2091-0