CARBON SEQUESTRATION IN SOIL AGGREGATES UNDER DIFFERENT CROPPING PATTERN IN GANGES MEANDER AND GANGES TIDAL FLOODPLAINS OF KHULNA REGION
DOI:
https://doi.org/10.53808/KUS.SI.SESB.2010.21-29-lsKeywords:
Carbon sequestration, cropping pattern, soil aggregatesAbstract
Sequestering carbon in soil aggregates is a long term solution to global warming that will keep CO2 out of the atmosphere. The study was conducted to investigate the state of carbon sequestration in soil aggregates under different cropping patterns of Khulna region. Twelve different cropping patterns were selected. Soil particle size distribution, microaggregate analysis, aggregate stability, normalized stability index (NSI) and organic carbon were determined. The soil organic carbon (SOC) associated with aggregate size ranges (8-2, 2-0.25 and 0.25-0.05 mm) were separated and determined. The SOC associated with 2-0.25 mm aggregates was generally higher than SOC associated with 8-2 mm and 0.25-0.05 mm aggregates. The state of aggregation (7.5%) and degree of aggregation (13.04%) were found high under Til (Sesame)-Fallow-T.aman cropping pattern and low under Aus-Fallow-Vegetable/ Vegetable-Sugarcane cropping pattern. The dispersion factor (28.25%) was highest under Vegetable cropping pattern. The highest NSI value (0.95) was under Fallow-Fallow-T.aman cropping pattern at Dhulirhat union in Satkhira district and the lowest value (0.29) was under Fallow-Fallow-T.aman cropping pattern at Aatlia union in Khulna district. The highest organic carbon content in aggregate size ranging from 8-2, 2-0.25 and 0.25-0.05 mm was found 2.28, 3.00 and 2.63%, respectively under Fallow-Fallow-T.aman cropping pattern at Dhulirhat union in Satkhira district. The lowest organic carbon content was found 0.53, 0.58 and 0.51%, respectively under Boro-Fallow-T.aman cropping pattern at Sokhipur union in Satkhira district. Organic carbon associated with 8-2 mm and 0.25-0.05 mm aggregate was negatively correlated with sand and positively with clay contents of the soils. Carbon associated with different aggregates was also positively correlated.
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