A one-year short-term biochar application improved carbon accumulation in large macroaggregate fractions

文献类型： 外文期刊

第一作者： Zhang, Qingzhong

作者： Zhang, Qingzhong;Du, ZhangLiu;Lou, Yilai;He, Xinhua

作者机构：

关键词： Black carbon;Carbon sequestration;Soil organic carbon;Soil structure stability

期刊名称：CATENA （ 影响因子：5.198； 五年影响因子：5.594 ）

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年卷期：

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收录情况： SCI

摘要： Biochar amended to soil may improve soil aggregation and in turn increase soil organic carbon (SOC) stabilization. In an intensive wheat-maize rotation system of the North China Plain, we investigated effects of one-year biochar application on soil aggregate-size distribution and structure stability, and aggregate-associated C concentrations. Three biochar (< 1 mm diameter, from corncob at 360 degrees C for 24 h) treatments were examined as no biochar amendment control, rate at 4.5 (B4.5) and 9.0 t ha(-1) year(-1) (B9.0). Soil samples were collected from 0-10 and 10-20 cm depths and separated into six water-stable aggregate sizes (>= 5, 2-5, 1-2, 0.5-1, 0.25-0.5 and 0.053-0.25 mm). Results showed that neither soil aggregation nor aggregate stability was significantly affected by biochar amendments. In contrast, more SOC was accumulated in the large fractions (>= 5 and 2-5 mm) under B9.0 than under the other two treatments. Meanwhile, more C occluded in the large fractions (>= 5, 2-5 and 1-2 mm) under both B4.5 and B9.0 than under no-biochar control, suggesting that biochar-C was physically protected within these aggregate fractions. Our data indicated that biochar application could be a potential pathway to improve native SOC and black C stabilization in the intensive cropping system of the North China Plain. (C) 2014 Elsevier B.V. All rights reserved.

分类号： S15

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