Preprints
https://doi.org/10.5194/egusphere-2023-44
https://doi.org/10.5194/egusphere-2023-44
25 Jan 2023
 | 25 Jan 2023

Carbon fluxes in spring wheat agroecosystems in India

K. Narender Reddy, Shilpa Gahlot, Somnath Baidya Roy, Vinay Kumar Sehgal, and Gayatri Vangala

Abstract. Carbon fluxes from agroecosystems contribute to the variability of the carbon cycle and atmospheric [CO2]. This study used the Integrated Science Assessment Model (ISAM) to investigate carbon fluxes and their variability in Indian spring wheat agroecosystems. First, ISAM was run in site-scale mode to validate GPP, TER, and NEP over an experimental spring wheat site in north India. When compared to flux-tower observations, the spring wheat module in ISAM outperformed the generic crop model. Following that, regional-scale runs were performed to simulate carbon fluxes across the country from 1980 to 2016. The results revealed that fluxes vary significantly across regions, owing primarily to differences in planting dates. Fluxes peak earlier in the country's eastern and central regions, where crops are planted earlier. During the study period, all fluxes show statistically significant increasing trends (p.01). GPP, NPP, Autotrophic Respiration (Ra), and Heterotrophic Respiration (Rh) increased at 1.272, 0.945, 0.579, 0.328, and 0.366 TgC/yr2, respectively. Numerical experiments were conducted to investigate how natural forcings such as changing temperature and [CO2] levels and agricultural management practices such as nitrogen fertilization and water availability could contribute to the rising trends. The experiments revealed that increasing [CO2], nitrogen fertilization, and irrigation water contributed to increased carbon fluxes, with nitrogen fertilization having the most significant effect.

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Journal article(s) based on this preprint

08 Sep 2023
Carbon fluxes in spring wheat agroecosystem in India
Kangari Narender Reddy, Shilpa Gahlot, Somnath Baidya Roy, Gudimetla Venkateswara Varma, Vinay Kumar Sehgal, and Gayatri Vangala
Earth Syst. Dynam., 14, 915–930, https://doi.org/10.5194/esd-14-915-2023,https://doi.org/10.5194/esd-14-915-2023, 2023
Short summary
K. Narender Reddy, Shilpa Gahlot, Somnath Baidya Roy, Vinay Kumar Sehgal, and Gayatri Vangala

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-44', Anonymous Referee #1, 10 Apr 2023
    • AC1: 'Reply on RC1', Narender Reddy, 09 Jun 2023
  • RC2: 'Comment on egusphere-2023-44', Anonymous Referee #2, 11 Apr 2023
    • AC2: 'Reply on RC2', Narender Reddy, 09 Jun 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-44', Anonymous Referee #1, 10 Apr 2023
    • AC1: 'Reply on RC1', Narender Reddy, 09 Jun 2023
  • RC2: 'Comment on egusphere-2023-44', Anonymous Referee #2, 11 Apr 2023
    • AC2: 'Reply on RC2', Narender Reddy, 09 Jun 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Reconsider after major revisions (10 Jun 2023) by Anping Chen
AR by Narender Reddy on behalf of the Authors (30 Jun 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (03 Jul 2023) by Anping Chen
RR by Anonymous Referee #2 (24 Jul 2023)
ED: Publish as is (02 Aug 2023) by Anping Chen
AR by Narender Reddy on behalf of the Authors (04 Aug 2023)  Author's response   Manuscript 

Journal article(s) based on this preprint

08 Sep 2023
Carbon fluxes in spring wheat agroecosystem in India
Kangari Narender Reddy, Shilpa Gahlot, Somnath Baidya Roy, Gudimetla Venkateswara Varma, Vinay Kumar Sehgal, and Gayatri Vangala
Earth Syst. Dynam., 14, 915–930, https://doi.org/10.5194/esd-14-915-2023,https://doi.org/10.5194/esd-14-915-2023, 2023
Short summary
K. Narender Reddy, Shilpa Gahlot, Somnath Baidya Roy, Vinay Kumar Sehgal, and Gayatri Vangala

Data sets

Carbon fluxes data over Indian spring wheat agro-ecosystem K. Narender Reddy, Shilpa Gahlot, Somnath Baidya Roy, and V. K. Sehgal https://doi.org/10.5281/zenodo.5833742

K. Narender Reddy, Shilpa Gahlot, Somnath Baidya Roy, Vinay Kumar Sehgal, and Gayatri Vangala

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Short summary
Carbon fluxes from agroecosystems change the carbon cycle and the amount of CO2 in the air. Using the Integrated Science Assessment Model (ISAM), we looked at the carbon cycle in areas where spring wheat is grown. The results showed that fluxes vary a lot between regions, mostly because planting times are different. According to our investigation into which variables have the greatest impact on the carbon cycle, nitrogen fertilizers added to crops have the greatest impact on the carbon cycle.