Effect of Long-term Fertilization on the Sequestration Rate of Physical Fractions of Organic Carbon in Red Soil of Southern China

文献类型： 外文期刊

第一作者： Xu, Minggang

作者： Xu, Minggang;Tong, Xiaogang;Wang, Xiujun

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期刊名称：MOLECULAR ENVIRONMENTAL SOIL SCIENCE AT THE INTERFACES IN THE EARTH'S CRITICAL ZONE

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年卷期： 2010 年

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收录情况： SCI

摘要： Typical red soil samples were collected from 17 years long-term fertilization experiments in Qiyang county of southern China. Physical fractions of the red soil include free particulate organic carbon (fPOC), intra-microaggregate particulate organic carbon (iPOC) and mineral associated organic carbon (MOC), were measured and the effects of fertilization on changes of soil organic carbon (SOC) stocks were analyzed. The results indicated that application of manure and manure-mixed-chemical fertilizer (M, NPKM, 1.5NPKM) significantly enhanced SOC and changed its physical fraction distribution. The highest sequestration rate in fPOC (290.6 similar to 408.3 kg.ha(-1.)yr(-1)), iPOC (162.0 similar to 179.2 kg.ha(-1.)yr(-1)) and MOC (322.9 similar to 514.5 kg.ha(-1.)yr(-1)) were observed in these treatments. However, the content of iPOC and MOC didn't increase in unbalanced chemical fertilizer application treatments (NP, N) in red soil, and they maintained lower SOC sequestration rate. The percentage of SOC sequestration distribution in different physical fractions under balanced fertilization treatments (NPK) followed the order: MOC (45.2%similar to 62.7%) > fPOC (21.9%similar to 35.2%) > iPOC (15.1%similar to 20.0%). The highest percentage of MOC implied that SOC associated silt and clay were the primary mechanism of SOC sequestration in red soil.

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