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- W2156837052 endingPage "2852" @default.
- W2156837052 startingPage "2838" @default.
- W2156837052 abstract "Abstract The physiological response of vegetation to increasing atmospheric carbon dioxide concentration ([ CO 2 ]) modifies productivity and surface energy and water fluxes. Quantifying this response is required for assessments of future climate change. Many global climate models account for this response; however, significant uncertainty remains in model simulations of this vegetation response and its impacts. Data from in situ field experiments provide evidence that previous modeling studies may have overestimated the increase in productivity at elevated [ CO 2 ], and the impact on large‐scale water cycling is largely unknown. We parameterized the Agro‐ IBIS dynamic global vegetation model with observations from the Soy FACE experiment to simulate the response of soybean and maize to an increase in [ CO 2 ] from 375 ppm to 550 ppm. The two key model parameters that were found to vary with [ CO 2 ] were the maximum carboxylation rate of photosynthesis and specific leaf area. Tests of the model that used Soy FACE parameter values showed a good fit to site‐level data for all variables except latent heat flux over soybean and sensible heat flux over both crops. Simulations driven with historic climate data over the central USA showed that increased [ CO 2 ] resulted in decreased latent heat flux and increased sensible heat flux from both crops when averaged over 30 years. Thirty‐year average soybean yield increased everywhere (ca. 10%); however, there was no increase in maize yield except during dry years. Without accounting for CO 2 effects on the maximum carboxylation rate of photosynthesis and specific leaf area, soybean simulations at 550 ppm overestimated leaf area and yield. Our results highlight important model parameter values that, if not modified in other models, could result in biases when projecting future crop–climate–water relationships." @default.
- W2156837052 created "2016-06-24" @default.
- W2156837052 creator A5015746759 @default.
- W2156837052 creator A5032088261 @default.
- W2156837052 creator A5033506558 @default.
- W2156837052 creator A5063780345 @default.
- W2156837052 creator A5067057675 @default.
- W2156837052 creator A5073630035 @default.
- W2156837052 creator A5085446569 @default.
- W2156837052 date "2013-07-24" @default.
- W2156837052 modified "2023-10-04" @default.
- W2156837052 title "Impacts of elevated CO<sub>2</sub>concentration on the productivity and surface energy budget of the soybean and maize agroecosystem in the Midwest USA" @default.
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- W2156837052 doi "https://doi.org/10.1111/gcb.12270" @default.