| dc.description.abstract | A field study was conducted to evaluate the carbon sequestration
potentiality in different agroforestry systems in the northern part of
Bangladesh, Dinajpur districts during October, 2018 to March, 2019.
The experiment was laid out in three agro-ecological zones; AEZ 1-Old
Himalayan piedmont plain (Birganj), AEZ 3-Tista meander flood plain
(Parbotipur) and AEZ 25-Level barind tract (Dinajpur sadar). The
Experimental plot was selected randomly in different locations from
each experimental unit (AEZ), in a randomized complete block design
(RCBD) with four replications. The treatments were: Factor A- five
agroforestry systems like homestead, eucalyptus and mahogany
cropland based, mango and litchi orchards based agroforestry system
and Factor B- three AEZs like AEZ 1, AEZ 3 and AEZ 25. Data were
recorded from tree growing parameters (height, diameter at breast
height) and under storied vegetation (herbs, shrubs and crops) to
estimate the total biomass accumulation and also soil carbon was
estimated. In case of the main effect of different agroforestry system
on carbon sequestrations, it was observed that there was significantly
difference in respect of tree height (m), DBH (cm), no of tree per
hectare, under storey vegetation and soil carbon stock (t/ha). The
highest total carbon sequestrations (563.12 t/ha) was recorded from
homestead agroforestry systems and the lowest (64.66 t/ha) was
obtained from mahogany cropland based agroforestry system. In case
of soil carbon sequestration, eucalyptus based cropland agroforestry
system sequestrated the highest amount (29.92 t/ha) of carbon and
mango based orchard agroforestry sequestrated the lowest amount
(25.67 t/ha) of carbon. The main effect of agro-ecological zones (AEZ) on carbon sequestrations also significantly varied. The highest amount
of carbon (307.56 t/ha) was sequestrated by AEZ 25 and the lowest
(159.68 t/ha) was from AEZ 3. Again, in the interaction effect of AEZ
and agroforestry systems on carbon sequestrations, the highest carbon
sequestration capacity (676.27 t/ha) was found in S1T1 (AEZ 1 +
homestead agroforestry system) and the lowest (43.87 t/ha) was found
in S2T3 (AEZ 3 + mahogany based cropland agroforestry system). The
findings of this study concluded that among the five agroforestry
systems, homestead agroforestry system sequestrated more carbon
and a better option for reducing atmospheric carbon. Again, among the
three AEZs, AEZ 25 gave the maximum carbon sequestration
potentiality. In case of economic value of carbon sequestration,
homestead agroforestry system also gave the maximum (29558.5 $/ha)
monetary return. Therefore, emphasis should be given in homestead
agroforestry systems to get better ecological impact in the northern
region of Bangladesh. Moreover, judicious tree plantation program
should be done in AEZ3 and AEZ 1 for the equilibrium carbon
sequestration capacity among different AEZs. | en_US |
