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[1]WANG Jia,FENG Xiaomiao,MI Shuzhen,et al.Influence of Elevated CO2 and Precipitation Regimes on the Characteristics of Photosynthesis and C, N of Wheat[J].Research of Soil and Water Conservation,2020,27(01):328-334,339.

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Influence of Elevated CO₂ and Precipitation Regimes on the Characteristics of Photosynthesis and C, N of Wheat

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 27 Number of periods: 2020 01 Page number: 328-334,339 Column: Public date: 2020-02-20

Title:: Influence of Elevated CO₂ and Precipitation Regimes on the Characteristics of Photosynthesis and C, N of Wheat

Author(s):: WANG Jia¹, FENG Xiaomiao¹, MI Shuzhen², RONG Hailiang³; (1.College of Resources and Environmental Sciences, Shijiazhuang University, Shijiazhuang 050035,China; 2.Henan Agricultural University, Zhengzhou 450000, China; 3.Shijiazhuang University of Applied Technology, Department of Electronic and Electrical Engineering, Shijiazhuang 050081, China)

Keywords:: precipitation regimes; CO₂; photosynthetic characteristics; C; N; wheat

CLC:: S158.3

DOI:: -

Abstract:: Atmospheric CO₂ concentrations are predicted to happen from approximately 350 μmol/mol, today to over 700 μmol/mol in the late 21th century. A pot experiment was conducted to study the interaction of elevated CO₂ concentration and precipitation changing with the characteristics of photosynthetic characteristics, biomass allocation, and carbon and nitrogen content characteristics in roots, stem, and leaf of wheat. The main plots included two CO₂ concentrations(350 and 700 μmol/mol)and five conditions of the precipitation patterns(natural precipitation control 0, 30%, -30%, and 15% of the precipitation(-15%, 15%], and 30%. The results showed that:(1)the interaction between increased CO₂ and precipitation had the significant effects on photosynthetic parameters, below-ground biomass and root: shoot ratio; at 350 μmol/mol CO₂ concentrations, above-ground biomass, below-ground biomass and C/N significantly increased, and root: shoot ratio significantly decreased;(2)the elevated CO₂ increased the carbon and decreased N of different organs, while precipitation regimes promoted or inhibited these results;(3)the elevated CO₂ increased photosynthetic rate(Pn), stomatal conductance(Gs)and intercellular CO₂ concentration(Ci), while precipitation regimes promoted Pn and Ci, and inhibited Gs and transpiration rate;(4)these results suggest that higher precipitation will not increase the biomass of wheat at the future ambient CO₂ levels, furthermore, CO₂ may partly compensate for the negative effect of low precipitation on the growth and development of wheat.

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Last Update: 2020-02-25