生物炭与秸秆添加对砂姜黑土团聚体组成和有机碳分布的影响

doi:10.3864/j.issn.0578-1752.2015.04.08

Abstract

Abstract: 【Objective】The influences of biochar and straw additions on lime concretion black soil water-stable aggregate composition and organic carbon distribution were studied.【Method】A six-month incubation experiment was conducted here. The experiment included four treatments: CK (no additional materials), B (biochar addition alone), S (straw addition alone) and BS (combined biochar and straw addition). All samples were separated into six aggregate-size classes (>2 mm, 1-2 mm, 0.5-1 mm, 0.25-0.5 mm, 0.053-0.25 mm and ＜0.053 mm) by wet sieving. Organic carbon contents of the aggregates were determined. 【Result】Compared with CK, biochar application did not change aggregate >2 mm fraction, while application of straw significantly increased the amount of >2 mm aggregate. Among all aggregates, application of biochar alone significantly increased the amount of size 0.053-0.25 mm, while straw significantly increased the fraction of 0.5-2 mm by 14%-68%. At the same time, B treatment had no significant influence on mean weight diameter (MWD), geometric mean diameter (GMD) and the contents of macro-aggregates (R_0.25), while MWD, GMD and R_0.25 of S and BS treatments were significantly increased and the fractal dimension (D) of all treatments were extremely lower than CK. In addition, all organic material treatments significantly increased the organic carbon content, among which BS was the highest by 160%, and the content of organic carbon at all levels of aggregate sizes were also highly increased by 54%-353%, as compared with CK treatment. Meanwhile, with the increment of the soil particle-size, it showed the V trend under biochar and the go-up tendency under straw alone on the distribution of organic carbon in aggregates. As for the contributing rates of aggregates to soil organic carbon，the trend of macro-aggregate was S > BS > CK > B, while micro-aggregate had the contrary tendency, and aggregates 0.5-1 mm in size were greater than other aggregate size by 6%-33%. 【Conclusion】 Applying biochar alone could not change the amount of macro-aggregate and its stability. Combined application of straw and biochar significantly increased soil macro-aggregate content and organic carbon content in all sizes of aggregates. In contrast, combined biochar and straw is the best fertilizing measure to improve soil structure and soil organic carbon content in lime concretion black soil.

Key words: biochar, straw, lime concretion black soil, soil organic carbon, soil aggregate

HOU Xiao-na, LI Hui, ZHU Liu-bing, HAN Yan-lai, TANG Zheng, LI Zhong-fang, TAN Jin-fang, ZHANG Shui-qing. Effects of Biochar and Straw Additions on Lime Concretion Black Soil Aggregate Composition and Organic Carbon Distribution[J].Scientia Agricultura Sinica, 2015, 48(4): 705-712.

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