Journal ArticleDOI
Canopy gradients in delta(18)O of organic matter as ecophysiological tool.
Reads0
Chats0
TLDR
In this paper, the authors determined vertical oxygen isotope gradients of leaf organic matter for a grassland in Switzerland and a mountain beech forest (Fagus sylvatica) in Northern Italy.Abstract:
We determined vertical oxygen isotope gradients of leaf organic matter for a grassland in Switzerland and a mountain beech forest (Fagus sylvatica) in Northern Italy A distinctly positive (18)O/(16)O gradient with height above ground was found for the grassland (79/1000 m(-1), p < 0001), whereas the gradient was negative for the forest (-0077/1000 m(-1), p < 0001) The results are consistent with microclimatic measurements, although large isotope variations between the species have to be taken into account for the grassland A conceptual scheme is shown which relates the isotope enrichment to the canopy density, considering the effects of transpiration and canopy structure We conclude that the analysis of the within canopy variation in delta(18)O of organic matter can be used to provide long-term estimates of leaf water isotope composition, thus improving existing isotope methods to determine the gas-exchange between vegetation and atmosphereread more
Citations
More filters
Journal ArticleDOI
Heavy water fractionation during transpiration
TL;DR: A small proportion of water molecules contain the heavier isotopes of hydrogen and oxygen, and there is a tendency for these heavier molecules of water to accumulate in leaves during transpiration as mentioned in this paper.
Heavy Water Fractionation during Transpiration 1
TL;DR: A small proportion of water molecules contain the heavier isotopes of hydrogen and oxygen, which have a tendency to accumulate in leaves during transpiration, including effects on the isotopic composition of organic molecules.
Journal ArticleDOI
On the isotopic composition of leaf water in the non-steady state
TL;DR: It is found that more water usually enters the leaf from the air than from the roots, and the form of the equations emphasises that the one-way fluxes of water into and out of the stomata must sometimes be considered separately, rather than as a net outward flux.
Journal ArticleDOI
δ18O of water vapour, evapotranspiration and the sites of leaf water evaporation in a soybean canopy
Lisa R. Welp,Xuhui Lee,Kyounghee Kim,Timothy J. Griffis,K. Billmark,John M. Baker,John M. Baker +6 more
TL;DR: High-frequency measurements of oxygen isotopic compositions of water vapour and evapotranspiration above a soybean canopy using the tunable diode laser (TDL) technique for the entire 2006 growing season in Minnesota, USA find that vertical variability in relative humidity and temperature associated with canopy structure must be addressed in canopy-scale leaf water models.
Journal ArticleDOI
Dual Δ¹³C/δ¹⁸O response to water and nitrogen availability and its relationship with yield in field-grown durum wheat.
TL;DR: The combination of plant Δ¹³C and δ¹⁸O predicted differences in GY and related agronomical parameters, providing agronomists and breeders with integrative traits for selecting crop management practices and/or genotypes with better performance under water- Limiting and N-limiting conditions.
References
More filters
Book
Physiological Plant Ecology: Ecophysiology and Stress Physiology of Functional Groups
TL;DR: In this article, an extensive chapter deals with the effects of natural and anthropogenic stress factors on plant ecophysiology, focusing on the ways the different plant species and functional types react in various locations and in all climatic zones.
Book ChapterDOI
Carbon and Oxygen Isotope Effects in the Exchange of Carbon Dioxide between Terrestrial Plants and the Atmosphere
Graham D. Farquhar,Jon Lloyd +1 more
TL;DR: In this paper, the effects of carbon and oxygen isotope effects in the exchange of carbon dioxide between terrestrial plants and the atmosphere are discussed, and a significant difference between long-term isotope discrimination and short-term “on-line” measures of discrimination.
Journal ArticleDOI
On the enrichment of H2 18-O in the leaves of transpiring plants.
TL;DR: Using a simple box model for transpiring leaves a quantitative understanding of the isotope fractionation is possible which is well confirmed by the results of model experiments as well as by measurements on trees.
Journal ArticleDOI
Comparison of Modeled and Observed Environmental Influences on the Stable Oxygen and Hydrogen Isotope Composition of Leaf Water in Phaseolus vulgaris L.
TL;DR: A model of stable isotope fractionation processes, originally developed by H. Craig and L. Gordon for evaporation of water from the ocean, can be applied to leaf transpiration to test the factors influencing the stable isotopic composition of leaf water under controlled environment conditions.
Journal ArticleDOI
Relative humidity‐ and ABA‐induced variation in carbon and oxygen isotope ratios of cotton leaves
TL;DR: In this paper, Gossypium hirsutum L. cv. CS50 plants were grown at two levels of relative humidity (RH) and sprayed daily with abscisic acid (ABA) at four concentrations.
Related Papers (5)
Carbon and Oxygen Isotope Effects in the Exchange of Carbon Dioxide between Terrestrial Plants and the Atmosphere
Graham D. Farquhar,Jon Lloyd +1 more