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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.
- 出版日期2015-4
- 单位中国农业科学院农业资源与农业区划研究所; 中国农业科学院农业环境与可持续发展研究所
