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Assessment of Existing Carbon Stock in Soils of 30 Aez in Bangladesh

Pranesh Kumar Saha
Principal Scientific Officer
Soil Science Division, BRRI, Gazipur

M. Sefaur Rahman
Scientific Officer
Soil Science Division, BRRI, Gazipur

Munira Khatun
Scientific Officer
Soil Science Division, BRRI, Gazipur

A. T. M. Sakhawat Hossian
Senior Scientific Officer

Abstract/ Executive Summary:

The soil organic carbon SOC (%) is decreasing with increasing soil depth irrespective of land types. The SOC (%) was found higher in the low land than medium highland and highland. Bulk density of medium highland varied from 1.11g/cc to 1.64g/cc where as in highland and lowland it varied from 0.99 g/cc to 1.61 g/cc and 0.77 g/cc to 1.51 g/cc respectively. Carbon stock (t/ha) of 0-20 cm depth is higher (8.11-7.36) in lowland soil type than that of medium highland (5.77-5.70) and highland soil type (5.32-4.43) irrespective of AEZ. Among the two AEZs highest SOC stock was found in AEZ-8 irrespective of land types.

Keywords: Bulk density, Soil organic matter, Organic C Stock

Location: BRRI experimental farm, Gazipur

Start Date: 01-07-2012

End Date: 31-06-2013

Program Area: Crop-Soil-Water Management

Non-commodity: Carbon sequestration

Objectives:

To document existing carbon stock in soils of 10 AEZs in Bangladesh

Methodology:

Survey study and soil sample collections were conducted by the Soil Science Division, Bangladesh Rice Research Institute (BRRI), Gazipur. AEZ 7. Active Brahmaputra and Jamuna Floodplain, AEZ 8. Young Brahmaputra and Jamuna Flood Plain, Selected upazilas under respective AEZs, AEZ 7; Active Brahmaputra and Jamuna Floodplain: Gaibandha Sadar and Fulchhori, AEZ 8. Young Brahmaputra and Jamuna Flood Plain: Tangail sadar and Bhuapur. Soil samples were collected based on land types and major cropping pattern in each of the 10 AEZs. GPS reading was taken in each and every location of sample collection. Major selected cropping patterns were rice- fallow -rice, rice-non-rice and only rice. A total of 480 soil samples were collected from 2 AEZs. Two upazilas/AEZ, three villages/upazila, 10 sampling spots/village, 4 samples/spot. From each sampling spot soil sample was collected considering 4 soil depths (0-5, 5-10, 10-15 and 15-20 cm). Soil samples were analyzed for organic carbon by wet oxidation method (Walkley and Black, 1934). One village per upazila, bulk density (g/cm³) was determined by core sampler method (Blake and Hartge, 1986) considering 4 soil depths (0-5, 5-10, 10-15 and 15-20 cm) under different land types (High land, medium high land and low land). The Carbon stock (t/ha) in soils was calculated by using the following equation (Masakazu Komatsuzaki & M. Faiz Syuaib, 2009) Carbon stock (t/ha) = organic carbon content (%) x bulk density (g/cm³) x soil depth (cm).

Source of Information: Proceedings of BRRI Annual Internal Review for 2012- 2013

Article Link (Online Journal):

Funding Source:

1. Bangladesh Agricultural Research Council

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Active Brahmaputra and Jamuna Floodplain: The organic carbon content (%) of soil is decreasing with increasing soil depth irrespective of land types. Organic carbon content (%) in highland was observed very low to medium as these values of organic carbon were 1.33% to 0.44%, in medium highland 1.42% to 0.42% and in low lands 1.72% to 0.69%. There were mainly three land types observed viz. highland, medium highland and lowland and the average organic carbon stock were 7.47 to 3.22, 7.86 to 3.40 and 8.88 to 5.20 t/ha respectively. The highest soil organic carbon stock (t/ha) was observed in lowland and the lowest was in highland. An average of 0 - 20 cm soil depth the highest amount of SOC content (1.17%) was found in lowland and the lowest amount (0.80%) in highland. Bulk density of medium highland varied from 1.11 g/cc to 1.64 g/cc where as in highland and lowland it varied from 1.12 g/cc to 1.61 g/cc and 1.03 g/cc to 1.51 g/cc respectively Young Brahmaputra and Jamuna Flood Plain: Organic carbon content (%) in highland was 1.26% to 0.40 %, in medium highland 1.50% to 0.45% and in low lands 2.57% to 0.94%. There were mainly three land types observed viz. highland, medium highland and lowland and the average organic carbon stock were 6.15 to 2.99, 8.01 to 3.39 and 9.31 to 6.27 t/ha respectively. Average of 0 - 20 cm soil depth the highest amount of SOC content (1.71%) was found in lowland and the lowest amount (0.77%) in highland. Bulk density of medium highland varied from 1.12 g/cc to 1.53 g/cc where as in highland and lowland it varied from 0.99 g/cc to 1.45 g/cc and 0.77 g/cc to 1.36 g/cc respectively.

Knowledge Management: Report/Proceedings