Author/s:

Rasid, M.
Chowdhury, N.
Osman, K.

Publisher:

Scientific & Academic Publishing

Year of Publication:

2017

Microbial biomass, activity and ecophysiological indices together with important physical and chemical properties were studied in soils under four different planted forests (Acacia auriculiformis, Artocarpus chaplasha, Dipterocarpus turbinatus and Lagerstroemia speciosa) in Chittagong, Bangladesh. The principal objective of the study was to investigate microbial activity related to carbon sequestration under different tree species. The mean values of pH, total nitrogen, organic carbon, microbial activity and microbial biomass carbon varied from 4.49 to 4.68, 0.9 to 1.9 mg kg-1, 6.4 to 10.6 mg kg-1, 0.06 to 0.13 mg CO2 g-1d-1 and 736.82 to 844.44 µg C g-1 respectively. Plant biomass as well as organic carbon content, microbial biomass and activity in soil was the highest in Artocarpus chaplasha. There were strong positive correlations between plant biomass and almost all the soil properties which suggested that plant species affected carbon transformations in the studied soils. Significant difference (P < 0.05) in organic carbon content and microbial activity was observed in soils under Acacia auriculiformis from soils under all other species. The ratio of microbial biomass carbon to soil organic carbon (qMic) was the highest and basal respiration and microbial biomass carbon ratio (qCO2) was the lowest in soils under Acacia auriculiformis and the variation was significant with soils of other species. Therefore, Artocarpus chaplasha the indigenous species of Bangladesh has greater potentiality to sequester carbon in soils than other three species, and Acacia auriculiformis the exotic species has the least contribution to sequester carbon in these soils.

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