Impacts and uncertainty analysis of elevated temperature and CO2 concentration on wheat biomass

doi:10.1007/s11442-012-0979-1

Abstract

Abstract:

Impacts of climatic change on agriculture and adaptation are of key concern of scientific research. However, vast uncertainties exist among global climates model output, emission scenarios, scale transformation and crop model parameterization. In order to reduce these uncertainties, we integrate output results of four IPCC emission scenarios of A1FI, A2, B1 and B2, and five global climatic patterns of HadCM3, PCM, CGCM2, CSIRO2 and ECHAM4 in this study. Based on 20 databases of future climatic change scenarios from the Climatic Research Unit (CRU) , the scenario data of the climatic daily median values are generated on research sites with the global mean temperature increase of 1℃(GMT+1D), 2℃(GMT+2D) and 3℃(GMT+3D). The impact of CO₂ fertilization effect on wheat biomass for GMT+1D, GMT+2D and GMT+3D in China’s wheat-producing areas is studied in the process model, CERES-Wheat and probabilistic forecasting method. The research results show the CO₂ fertilization effect can compensate reduction of wheat biomass with warming temperature in a strong compensating effect. Under the CO₂ fertilization effect, the rain-fed and irrigated wheat biomasses increase respectively, and the increment of biomass goes up with temperature rising. The rain-fed wheat biomass increase is greater than the irrigated wheat biomass. Without consideration of CO₂ fertilization effect, both irrigated and rain-fed wheat biomasses reduce, and there is a higher probability for the irrigated wheat biomass than that of the rain-fed wheat biomass.

Key words: rising temperature, CO₂ concentration, wheat, biomass, probabilistic projection

LIU Yujie, TAO Fulu. Impacts and uncertainty analysis of elevated temperature and CO₂ concentration on wheat biomass[J].Journal of Geographical Sciences, 2012, 22(6): 1002-1012.

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Impacts and uncertainty analysis of elevated temperature and CO₂ concentration on wheat biomass

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