Soil aggregation and organic carbon fractions affected by long-term fertilization in a red soil of subtropical China

文献类型： 外文期刊

第一作者： Huang, Shan

作者： Huang, Shan;Peng, Xianxian;Huang, Qianru;Zhang, Weijian;Zhang, Weijian

作者机构：

关键词： Carbon sequestration;Long-term fertilization experiment;Soil aggregates;Soil organic carbon fractions;Red soils

期刊名称：GEODERMA （ 影响因子：6.114； 五年影响因子：6.183 ）

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收录情况： SCI

摘要： We examined the long-term effects of inorganic fertilizer (N and NPK) and manure application on soil aggregation and carbon (C) fractions under a double corn (Zea mays L.) cropping system in a subtropical red soil. Results showed that application of manure combined with NPK (NPK + M) gained the highest yield and increased the stability of crop production. Application of inorganic fertilizer could sustain soil organic carbon (SOC) concentrations, whereas long-term application of manure alone or combined with NPK (M and NPK + M) significantly increased SOC contents compared with the unfertilized control. Manure application significantly increased the proportion of large macroaggregates (> 2000 mu m) compared with the control, while leading to a corresponding decline in the percentage of microaggregates (53-250 mu m). Carbon storage in the intra-aggregate particulate organic matter within microaggregates (iPOM_m) was enhanced from 9.8% of the total SOC stock in the control to 19.7% and 18.6% in the M and NPK + M treatments, respectively. The shift in SOC stocks towards microaggregates is beneficial for long-term soil C sequestration. Moreover, the differences in the microaggregate protected C (i.e., iPOM_m) accounted, on average, for 39.8% of the differences in total SOC stocks between the control and the manure-applied treatments. Thus, we suggest that the microaggregate protected C is promising for assessing the impact of long-term fertilization management on SOC storage in the red soil.

分类号： S15

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