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	Dew water isotopic ratios and their relationships to ecosystem water pools and fluxes in a cropland and a grassland in China
	Wen X. F. ; Lee X. H. ; Sun X. M. ; Wang J. L. ; Hu Z. M. ; Li S. G. ; Yu G. R.
	2012
关键词	Stable isotope Dew water Water vapor Leaf water TDLAS Flux partitioning heat-balance method atmospheric co2 stable-isotope surface humidity eddy covariance leaf water vapor evapotranspiration plants exchange
英文摘要	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 O-18 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 originated from soil evaporation and transpiration of the leaves in the lower canopy (2%).
出处	Oecologia
卷	168
期	2
页	549-561
收录类别	SCI
ISSN号	0029-8549
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/26749]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Wen X. F.,Lee X. H.,Sun X. M.,et al. Dew water isotopic ratios and their relationships to ecosystem water pools and fluxes in a cropland and a grassland in China. 2012.

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