Track 2-07: Climate Change Impacts on Grassland Production, Composition, Distribution and Adaptation
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Publication Date
2013
Location
Sydney, Australia
Description
Carbon uptake and water loss of plants are controlled by the regulation of carbon assimilation rate (A) and stomatal conductance (gs). Any changes in these parameters under rising atmospheric CO2 concentration (ca) influence plant water-use efficiency and can affect carbon and water relations in grassland ecosystems. Time-series analyses of intrinsic water-use efficiency (Wi) of C3 grassland vegetation during the 20th century have shown that carbon uptake relative to water loss generally increased (Köhler et al. 2010, 2012; Barbosa et al. 2010). Short-term experiments suggest that nitrogen (N) supply (Stitt and Krapp 1999) and N form (Bloom et al. 2011) also play a role.
We hypothesize that any increase in Wi should be stronger in swards with high N availability and with ammonium (NH4)-N instead of nitrate (NO3)-N fertilization.
Citation
Köhler, Iris H.; Macdonald, Andy; and Schnyder, Hans, "Effects of Nitrogen Supply and Nitrogen Form on Intrinsic Water-Use Efficiency in Temperate, Semi-Natural Grasslands under Rising Atmospheric CO2" (2013). IGC Proceedings (1985-2023). 19.
(URL: https://uknowledge.uky.edu/igc/22/2-7/19)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Effects of Nitrogen Supply and Nitrogen Form on Intrinsic Water-Use Efficiency in Temperate, Semi-Natural Grasslands under Rising Atmospheric CO2
Sydney, Australia
Carbon uptake and water loss of plants are controlled by the regulation of carbon assimilation rate (A) and stomatal conductance (gs). Any changes in these parameters under rising atmospheric CO2 concentration (ca) influence plant water-use efficiency and can affect carbon and water relations in grassland ecosystems. Time-series analyses of intrinsic water-use efficiency (Wi) of C3 grassland vegetation during the 20th century have shown that carbon uptake relative to water loss generally increased (Köhler et al. 2010, 2012; Barbosa et al. 2010). Short-term experiments suggest that nitrogen (N) supply (Stitt and Krapp 1999) and N form (Bloom et al. 2011) also play a role.
We hypothesize that any increase in Wi should be stronger in swards with high N availability and with ammonium (NH4)-N instead of nitrate (NO3)-N fertilization.
