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Banaras Hindu University (2019)

Modeling the influence of Atmospheric Aerosols on Crop Production in Indo Gangetic Basin

Modeling the influence of Atmospheric Aerosols on Crop Production in Indo Gangetic Basin

Titre : Modeling the influence of Atmospheric Aerosols on Crop Production in Indo Gangetic Basin

Auteur : Sonkar, Geetika

Université de soutenance : Banaras Hindu University

Grade : Doctor of Philosophy (PhD) 2019

Résumé
ABSTRACT In an era of growing population, the importance of agricultural production cannot be underestimated. The rapid urbanization and economic development are constraints to expanding the area for agricultural production to meet the increasing demand. Increasing food demand and expected decline in production due to climate change is the major issue to tackle among the scientific community. Increasing atmospheric pollution on the other hand exacerbate the existing burden on food security. There are several studies showing that climate have an important role in growth and development of the crops. Any change in the climatic parameters can have a negative influence on crop productivity. Therefore, it is important to understand and substantiate the impact of changing climate and increasing pollution on crop yield.
There are some global efforts on quantifying the effects of elevated temperature, trace gases and aerosols on crop production, while such projections are exceedingly rare over India. The aerosols are suspended in the atmosphere, alters the amount of solar radiation reaching the earth’s surface i.e. they reduce the total irradiance and increase the fraction of radiation which is diffuse. This might affect the growth and development of the crop.
In, the view of above the present study has been performed to examine the role of air pollution on the agricultural crops over Indo-Gangetic Basin. Following objectives were formulated (1) to evaluate the CERES-Wheat and CERES-Rice crop model for the Indo-Gangetic Basin, (2) to quantify the radiative influence of atmospheric aerosols on what and rice crops, (3) to simulate the potential and attainable yield of wheat and rice yields under different atmospheric aerosol conditions.
To fulfill the objectives, the present study was performed over the of Indo-Gangetic Basin which is agriculturally fertile and highly aerosol loaded region in India. To analyze the impact of aerosols on wheat and rice crop production, the statistical and dynamical modeling approaches were applied. For the statistical approach, linear regression model was used whereas, for the dynamic modeling approach, the DSSAT Crop simulation model and Tropospheric Ultraviolet Radiation Model was used.
The CERES-Wheat and CERES-Rice models were calibrated and validated for the estimation of genetic coefficients for the wheat and rice crop varieties. These coefficients performed well under all the conditions for several locations of the IGB. This model was further used to study the influence of aerosols on crop production under various atmospheric conditions.

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