Title: Changes in Agricultural Soil Organic Carbon Fractions with Land Uses in Soils from Different Origins in Jianghan Plain
Abstract: Topsoil samples were collected from croplands with different land uses and soil origins in Jianghan plain,Hubei province,China.Total soil organic carbon(SOC) content and fractions of hot water extractable carbon(HWEC),labile organic carbon(LOC),calcium-and iron oxyhydrate-bound organic carbon were analyzed.Relationship between SOC content and the related main soil factors was investigated.SOC was affected by different land use patterns and soil origins: In soils reclaimed from wetlands,SOC contents in rice paddies(18.34±5.78) g/kg was significantly higher than that in dry croplands(11.18±3.39) g/kg;while in soils reclaimed from red soils,that in rice paddies(16.21±4.13) g/kg did not differ significantly from that in dry croplands(14.54±3.41) g/kg.SOC contents in rice paddies did not show significant difference between soils reclaimed from wetlands and red soils;whereas that in dry croplands reclaimed from red soils was significant higher than that from wetlands.HWEC and LOC as well as ratios of HWEC to SOC and of LOC to SOC in rice paddies reclaimed from wetlands were significant higher than that from red soils.Mechanisms of SOC stabilization varied with different land use patterns and soil origins: Clay protection played an important role in soils reclaimed from wetlands;while in paddy soils,SOC chemical stabilization appeared to relate to the protection of free oxidized iron.Protection of oxidized iron had a significant contribution to SOC stabilization in rice paddies reclaimed from red soils due to the large amount of free oxidized iron.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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