Study on the Carbon Sequestration Potentiality of Different Cropland Agroforestry Systems in Dinajpur District

Abstract

A Field experiment was conducted in Kaharole upazila of Dinajpur district of Bangladesh to evaluate the carbon sequestration and climate risk adaptation potentiality in different cropland systems, during October 2018 to September 2019. The experiment was laid out in randomized complete block design (RCBD) with three replications. There were two experiments; experiment 1taking three cropland agroforestry systemsviz:-boundary, composite and scattered cropland while experiment 2 taking nine agroforestry practices viz:-Mahagoni-Maize, Mahagoni-Rice, Eucalyptus-Maize, Mango-Vegetable, Mango-Rice, Lombu-Rice, Eucalyptus-Mahagoni-Maize, Lombu-Mango-Rice, Mahagoni-JackfruitVegetable. So, there were total 36 experimental plots with two experiments. Data were recorded from tree growth parameters (height and diameter at breast height) and under storeyvegetations (herbs, shrubs and crops) in order to estimate the different cropland biomass accumulation. The results revealed that there was significant difference of carbon sequestration potentiality of different cropland systems. In case of identified different cropland systems and agroforestry practices there were 3 cropland systems and 9 agroforestry practices available in Kaharole upazila in Dinajpur district. In case of the effect of different cropland systems and agroforestry practices on carbon sequestration, there were significantly differencesin tree carbon sequestration (t/ha) and total carbon sequestration in leaf litter, herb and grass (t/ha) on different croplands. The highest total cropland carbon sequestration (328.11 t/ha) was recorded from composite cropland agroforestry system and the lowest (81.61 t/ha) was obtain from scattered cropland agroforestry system. In case of effect of different agroforestry practices carbon sequestration also significantly varied in respect of all the considered parameters. The highest carbon sequestration (402.09 t/ha) was recorded from eucalyptus-mahagoni-maize practice and the lowest (9.7533 t/ha) was obtained from mango-vegetable agroforestry practices. Among the three cropland systems, the composite plantation gave the maximum carbon sequestration potentiality. Among the nine agroforestry practices, the eucalyptus-mahagoni-maize practice showed the maximum carbon sequestration potentiality. In case of economic value of carbon sequestration, the composite cropland system gave the maximum (39713.95 $/ha) monitory return. Therefore, composite plantation is better option for cropland agroforestry system to reduce atmospheric carbon and emphasis should be given in composite cropland plantation for mitigating the green house gases and also contribute the climate risk adaptation potentiality.