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Research Detail

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M.N.J. Pakhom
Department of Agroforestry and Environment, Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200, Bangladesh

M.S. Rahman*
Department of Agroforestry and Environment, Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200, Bangladesh

M.S. Bari
Department of Agroforestry and Environment, Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200, Bangladesh

M. Dhar
Police Headquarters, Dhaka

A Field experiment was conducted in Kaharol 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 a Randomized Complete Block Design (RCBD) with three replications. There were two experiments; experiment1taking three cropland agroforestry systems viz:-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 and Mahagoni-Jackfruit-Vegetable. So, there were total 36 experimental plots. Data were recorded on tree growth parameters (tree height and diameter at breast height) and under storey vegetations (herbs, shrubs and crops) in order to estimate the different cropland biomass accumulation. The results revealed that there were significant differences of carbon sequestration potentiality of different cropland systems and agroforestry practices. There were significant differences in tree carbon sequestration (t/ha) and total carbon sequestration in leaf litter, herb and grass (t/ha) under different cropland systems and agroforestry practices. Among different cropland systems, 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 obtained from scattered cropland agroforestry system. Among the different agroforestry practices, the highest carbon sequestration (402.09 t/ha) was recorded from eucalyptus-mahagoni-maize practice and the lowest (9.75 t/ha) was obtained from mango-vegetable agroforestry practices. Therefore, the composite plantation gave the maximum carbon sequestration potentiality and 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) and eucalyptus- mahagoni- maize agroforestry practices gave the maximum (13987.38 $/ha) monetary return. Therefore, composite plantation can be suggested as a better option for cropland agroforestry system to reduce atmospheric carbon for mitigating the greenhouse gases and also contribute the climate risk adaptation potentiality. 

  Cropland agroforestry, Carbon sequestration, Biomass, Value of carbon sequestration
  Kaharol upazila of Dinajpur district of Bangladesh
  00-10-2018
  00-09-2019
  Crop-Soil-Water Management
  Carbon sequestration

The establishment of agroforestry based land use system will help in substantial and productive agriculture and climate change mitigation. However, the amount of carbon that can be sequestered by this system is unknown. Therefore, the present study was undertaken to identify the existing cropland system and agroforestry practices in Dinajpur district, to estimate the biomass and total carbon sequestration by cropland agroforestry systems to quantify the economic value of carbon credits in cropland agroforestry systems in Dinajpur district. And finally to establish and compare the amount of carbon sequestered by different agroforestry land use system.

The study was conducted in different cropland agroforestry farms of Kaharol upazila under Dinajpur district during the period October, 2018 to September, 2019. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications in each treatment. Total number of experimental plots was 36. The two experiments are-Experiment 1: Different types of cropland agroforestry (C1= Boundary cropland, C2= Composite cropland, C3= Scattered cropland) and Experiment 2: Different cropland agroforestry practices (P1= Mahagoni-Maize, P2= Mahagoni-Rice, P3= Eucalyptus-Maize, P4= Mango-Vegetable, P5= Mango-Rice, P6= Lombu -Rice, P7= Eucalyptus-Mahagoni-Maize, P8= Lombu-Mango-Rice, P9= Mahagoni-Jackfruit-Vegetable). The procedure for sampling of this experiment varied due to different cropland agroforestry systems. Only mature trees within the diameter of breast height greater than 5cm (DBH) were considered for this experiment. On the other hand, leaf litter, herb, grass was sampled using 1×1m quadrant method. All biomass was collected and fresh weight was recorded and then taken to laboratory and dried it at 800C for 72 hours. Dry weight was also recorded. A sample unit of 20m×20m transact line was laid in the boundary, composite and scattered cropland, number of trees was counted with their DBH and height were measured. The distance was then converted in 400 m2 and finally in hectares. The stand density from different land use was measured using the following formulae:

Above ground tree biomass = 0.0595× ρD2H (kg/tree) (Chave et al.2005)

Where, D = Diameter of breast height (cm), H = Tree height (cm), ρ= Wood specific gravity (mgm-3 )

Below ground tree biomass =Aboveground tree biomass×0.26 (kg/tree)

Total tree biomass =Above ground tree biomass + Below ground tree biomass (kg/tree)

  Journal of Science and Technology 18 (June 2020): 43-52
  
Funding Source:
1.   Budget:  
  

From the result of the present study it should be concluded that the composite cropland agroforestry and the eucalyptus-mahagoni-maize plantation sequestrated more carbon and a better option for reducing atmospheric carbon. Therefore, the composite cropland agroforestry system and eucalyptus-mahagoni-maize agroforestry practices seems to be a better option for large tree plantation coverage and reduction of CO2 effects.

  Journal
  


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