Soil Organic Fractions in Cultivated and Uncultivated Soils of Costal Area in Bangladesh
Soil Organic Fractions in Cultivated and Uncultivated Soils of Costal Area in Bangladesh作者机构：Soil Water and Environment Discipline Khulna University Khulna Bangladesh
出 版 物：《Journal of Agricultural Chemistry and Environment》 (农业化学和环境（英文）)
年 卷 期：2019年第8卷第3期
页 面：129-144页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：Particle Size Fraction Soil Organic Carbon Nitrogen Saline Soil
摘 要：Assessment of soil organic matter fractions can be instrumental in understanding the causes of limited nitrogen supply, and thus soil fertility restoration. A study was conducted in cultivated and uncultivated saline soil, in order to assay soil organic carbon (SOC), its particle-size fractions and their influence on cultivation and soil fertility at Sundarbans costal area in Bangladesh. Soil samples were taken from the 0 - 15 and 15 - 30 cm depths from four cultivated fields and from four nearby sites in a native mangrove forest as references. Soil samples were physically fractionated into sand (2000-50 μm), silt (50-2 μm) and clay ( silt sand. The SOC pool and N in the clay-sized fraction were correlated to soil fertility indicators. More N was stored in the silt + clay size fractions, a generally more stable pool, than in the more labile sand-sized pool. The SOC pool in sand size fractions was far below in cultivated soils than in a reference uncultivated soil. Thus, the sand-sized pool emerged as the most likely cause of limited N supply in cultivated soils.
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