Carbon Sequestration in Soil Aggregates under Different Cropping Patterns of Bangladesh

• 作者: Md. Sadiqul Amin Md. Zulfikar Khan Sheikh Mohammad Fazle Rabbi Tutul Laskar
• 来源期刊: 土壤科学期刊(英文)
• 学科: 医学
• 关键词: Carbon Sequestration Carbon Stock Soil Aggregate Cropping Patterns Climate Change
• 年，卷（期）: 2020,（10）
• 页码范围: 459-485
• 页数: 27页
• 分类号: R74

摘要

Land use change and cropping patterns are important factors for controlling carbon sequestration in soils and they may also change the relative importance of different mechanisms of soil organic matter stabilization. The study was conducted to investigate the state of carbon sequestration in soil aggregates under different cropping patterns of Khulna, Jessore and Chapainawabganj districts in Bangladesh. Thirty-six soil samples were collected from (0 - 100 cm depth) above mentioned regions of three physiographic regions: Ganges Meander Floodplain, Ganges Tidal Floodplain and High Barind Tract. The texture of the samples varied within three soil texture groups, Silt Loam, Silty Clay Loam and Silty Clay. The highest NSI value (0.89) was found under Wheat-Fallow-T. Aman cropping pattern in Silty Clay soils (sample No 15) and lowest value (0.59) was found Vegetables/Mustard-Fallow-T. Aman cropping pattern in Silt Loam soils (sample No 17). The highest value (735.20 mg<span style="white-space:nowrap;"><span style="white-space:nowrap;">&bull;</span></span>kg^{<span style="white-space:nowrap;"><span style="white-space:nowrap;">&minus;</span></span>1}) of active C was observed under Chickpea/mustard-T. Aman (Sample No 31) and the lowest value (619.23 mg<span style="white-space:nowrap;"><span style="white-space:nowrap;">&bull;</span></span>kg^{<span style="white-space:nowrap;"><span style="white-space:nowrap;">&minus;</span></span>1}) was found in case of Wheat-Fallow-T. Aman cropping pattern (Sample No 30). The highest SOC stock (1.62 Kg C m^{<span style="white-space:nowrap;"><span style="white-space:nowrap;">&minus;</span></span>2}) was found in Silty Clay Loam soil under Mungbean/Ash gourd-T. Aman cropping pattern (Sample no 4) and the lowest SOC stock (0.35 Kg C m^{<span style="white-space:nowrap;"><span style="white-space:nowrap;">&minus;</span></span>2}) was found in Silt Loam soil under Cauliflower/Pumkin/Spinach-T. Aman Cropping pattern (Sample No 2). Soil organic carbon associated w