Journal of Natural Environment

Comparison of CO2 and CH4 emissions from selected land uses of Behbahan city

Document Type : Research Paper

Authors

1 Department of Soil Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Khuzestan, Iran

2 Department of Soil Science , Faculty of Agriculture, Shahid Chamran University of Ahvaz, Khuzestan, Iran

3 Department of Civil Engineering, Khatam-al-Anbia University of Behbahan, Khuzestan, Iran

Abstract

The aim of this study was to evaluate the amount of carbon dioxide and methane emissions to the atmosphere in two seasons, autumn and spring. The study area is located in some parts of Behbahan city in the southeast of Khuzestan province. The area comprised agricultural, rangeland and palm tree land uses. In agricultural land use, the majority of the area is cultivated by wheat, rapeseed, bean and alfalfa crops. Hence, the locations of the gas sampling points were selected in a way that includes all land uses with major crops in the area. The closed Static Chamber (CSC) was used for collecting and harvesting gas samples. Accordingly, an experiment based on randomized complete block design with 2 replications was run in SAS v 9.2. To compare the averages, the Duncan test was used. The results showed that the averages of carbon dioxide and methane emissions were significantly (p < 0.05) different among land uses. The highest amounts of carbon emissions occurred in agricultural land uses. The alfalfa cultivation with an average of 1.09 g carbon / m2 per day and bean with an average of 0.5 g carbon/m2 per day had the highest and the lowest rate of gas emission, respectively. Lands with palm tree cultivations (0.54 g/m2/day) and rangelands with an emission rate of 0.33 (g/m2/day) placed in the next orders. The results also showed that carbon dioxide emissions were higher in spring than in autumn but methane emissions are higher in autumn than in spring. There was no significant correlation between soil properties and carbon emission levels except sand percentages. The overall results showed that the effect of season and land use on carbon gas emissions is more than soil properties.

Keywords

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Journal of Natural Environment
Volume 73, Issue 3
December 2020
Pages 457-470