引用本文:刘真勇,高 振,王艳玲,姚 怡.旱地转变为稻田对关键带红壤剖面土壤团聚体碳含量的影响[J].土壤学报,2019,56(6):1526-1535.
LIU Zhenyong,GAO Zhen,WANG Yanling,YAO Yi.Effect of Conversion of Upland into Paddy Field on Content of Carbon in Soil Aggregates along Soil Profile of Red Soil in Critical Red Soil Zone[J].Acta Pedologica Sinica,2019,56(6):1526-1535
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旱地转变为稻田对关键带红壤剖面土壤团聚体碳含量的影响
刘真勇, 高 振, 王艳玲, 姚 怡
南京信息工程大学应用气象学院生态气象环境研究中心
摘要:
在红壤关键带江西鹰潭孙家小流域观测站选取花生旱地、新稻田(< 30 a)及老稻田(> 200 a)3个典型剖面(0~120 cm),按照30 cm的土层间隔自下而上地采集剖面样品,采用湿筛法逐级提取了粒级为> 250 μm、250~53 μm及< 53 μm团聚体的样本,分析各粒级团聚体的全碳含量及其对土壤全碳贡献率的变化,探讨铁铝氧化物与团聚体碳含量的相关关系。结果表明:红壤关键带的花生旱地和新、老稻田剖面土壤中250~53 μm团聚体所占比例高达41.9%~58.2%;花生旱地向新、老稻田转换的过程中,剖面土壤> 250 μm团聚体的比例呈现出“低-高-低”的变化趋势,250~53 μm团聚体的比例呈现出“高-低-低”的变化趋势,而< 53 μm团聚体的比例呈现出“低-低-高”的变化趋势;从旱地转为稻田,尤其是长期的水耕熟化作用会使各土层土壤及大小粒级团聚体的全碳含量显著增加,且无定形氧化铁的形成对红壤旱地和老稻田的全碳含量有重要影响;三个剖面的土壤全碳含量均随着剖面呈现出先快速降低,后趋于平稳的变化规律,但较深土层中< 53 μm团聚体对老稻田新增加的全碳贡献最大。
关键词:  红壤关键带  花生旱地  稻田  团聚体  全碳
DOI:10.11766/trxb201806200338
分类号:
基金项目:国家自然科学基金项目(41571130053, 41571286 )
Effect of Conversion of Upland into Paddy Field on Content of Carbon in Soil Aggregates along Soil Profile of Red Soil in Critical Red Soil Zone
LIU Zhenyong, GAO Zhen, WANG Yanling, YAO Yi
International Center for Ecology,Meteorology and Environment,College of Applied Meteorology,Nanjing University of Information Sciences and Technology
Abstract:
So far little has been reported in the literature on variation of carbon distribution in soil aggregates along a soil profile of a farmland converted from upland into paddy field at the Red Soil Critical Zone Observatory (RSCZO) in Yingtan, Jiangxi. This study was oriented to investigate (i) particle size composition and distribution of soil aggregates; (ii) changes in carbon content in soil aggregates, relative to fraction in particle size; and (iii) how iron-aluminum oxides affect carbon in the soil profiles of upland peanut fields, and old and new paddy fields of red soil. Soil samples were collected by layer from bottom to top in the profiles (0~120 cm) of upland peanut fields, new paddy fields (< 30 years) and old paddy fields (> 200 years) at the RSCZO located at the Sunjia watershed, Yingtan, Jiangxi Province of China. Soil aggregates in the soil samples were were collected and fractionated, by > 250 μm, 250~53 μm, and < 53 μm, kwith the wet sieving method. Carbon contents in the soil and aggregates were analyzed, and the relationships between soil iron-aluminum oxides and carbon in the soil aggregates were also discussed. Results show that the aggregates of the fraction of 250~53 μm accounted for 41.9%~58.2% of the total.in the soil profile, in all the three types of the field. The proportion of the fraction of > 250 μm, 250~53 μm and < 53 μm varied in a trend of "low - high - low", "high low low" and "low - low - high", respectively, in all soil layers with the land use pattern changing from upland peanut field to new and old paddy field. Carbon contents in the soil and soil aggregates increased significantly after the field was converted from upland to paddy, especially after long-term paddy cultivation. The formation of amorphous iron oxide in the soil affected significantly the content of total carbon in the soil of the upland peanut field and old paddy field. The content of soil total carbon in the soil profiles of all the fields decreased rapidly at first and then leveled off with soil depth, and in deep soil layers, the fraction of aggregates < 53 μm contributed the most to the increment in total carbon in the old paddy field.
Key words:  Red Soil Critical Zone Observatory (RSCZO)  Upland Peanut field  Paddy field  Aggregate  Carbon