Effect of different elevated CO2 concentrations and nitrogen application on net CO2 fluxes in wheat field
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S512;X16

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    Abstract:

    To investigate the effect of different CO2 concentrations and nitrogen application on net CO2 fluxes in wheat field,an automatic CO2 concentration control platform consisting of open-top chamber (OTC) was used to simulate an elevated CO2 concentration environment.Three CO2 concentration levels were set:CK (ambient atmospheric CO2 concentration),C1(CO2 concentration increased by 120 μmol·mol-1 compared with CK) and C2(CO2 concentration increased by 200 μmol·mol-1 compared with CK);two nitrogen fertilizer treatments were set at regular nitrogen fertilizer (N1,25 g·m-2) and low nitrogen fertilizer (N2,15 g·m-2).The net CO2 fluxes in the wheat field were observed using a static chamber-high precision gas analyzer.The results showed a consistent trend of net CO2 fluxes in wheat field under all treatments:increased until peaked at the jointing and heading stages,and then decreased.Under the N1 treatment,the CO2 accumulation under CK,C1 and C2 treatments were-105.8±12.6,-123.1±11.5 and-120.2±4.1 kg·hm-2,respectively.Under the N2 treatment,the CO2 accumulation under CK,C1 and C2 treatments were-82.3±9.2,-95.4±7.6 and-96.7±2.8 kg·hm-2,respectively;the CO2 accumulation of C2 treatment at jointing stage was significantly higher than that of CK by 31.8%(P=0.024).Under the C1 treatment,the CO2 accumulation of N1 treatment was significantly higher than that of N2 treatment by 55.0%(P=0.009) at the jointing stage.Under the C2 treatment,the CO2 accumulation of N1 treatment was significantly higher than that of N2 treatment by 23.6%(P=0.010) during the whole growth stage.The correlation between net CO2 fluxes and soil moisture reached significance under all treatments.Under the N1 treatment,the correlation between net CO2 fluxes and photosynthetic effective radiation under C1 and C2 treatments was significant,and under the N2 treatment,the correlation between net CO2 fluxes and photosynthetic effective radiation under CK and C1 treatment was significant.Under the N1 treatment,the correlation between net CO2 fluxes and air temperature was significant only under C1 treatment.This study showed that the effect of nitrogen application on the net CO2 fluxes in wheat field was more significant than that of elevated CO2 concentration at the jointing and heading stages of wheat,and there was no significant interaction between the elevated CO2 concentration and nitrogen application on the net CO2 fluxes in wheat field.

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DANG Huihui, LIU Chao, XIA Ye, WU Zhurong, WANG Yuanyuan, HU Zhenghua, CHEN Shutao. Effect of different elevated CO2 concentrations and nitrogen application on net CO2 fluxes in wheat field[J]. Journal of Nanjing University of Information Science & Technology,2022,14(1):77-87

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  • Received:December 08,2021
  • Online: April 11,2022
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