Preprints
https://doi.org/10.5194/egusphere-2023-44
https://doi.org/10.5194/egusphere-2023-44
 
25 Jan 2023
25 Jan 2023
Status: this preprint is open for discussion.

Carbon fluxes in spring wheat agroecosystems in India

K. Narender Reddy1, Shilpa Gahlot1, Somnath Baidya Roy1, Vinay Kumar Sehgal2, and Gayatri Vangala1 K. Narender Reddy et al.
  • 1Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, New Delhi, 110016, India
  • 2Division of Agricultural Physics, ICAR-Indian Agricultural Research Institute, New Delhi, 380015, India

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.

K. Narender Reddy et al.

Status: open (until 08 Mar 2023)

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K. Narender Reddy et al.

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 et al.

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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.