Short-term effects of maize residue biochar on phosphorus availability in two soils with different phosphorus sorption capacities

文献类型： 外文期刊

第一作者： Zhai, Limei

作者： Zhai, Limei;CaiJi, Zhuoma;Liu, Jian;Wang, Hongyuan;Gai, Xiapu;Xi, Bin;Liu, Hongbin;CaiJi, Zhuoma;Liu, Jian;Ren, Tianzhi

作者机构：

关键词： Biochar;Fluvo-aquic soil;Phosphorus availability;Phosphorus sorption capacity;Red earth;Soil Olsen-P

期刊名称：BIOLOGY AND FERTILITY OF SOILS （ 影响因子：6.432； 五年影响因子：6.332 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： This study investigated the effects of maize (Zea mays L.) straw biochar on phosphorus (P) availability in two soils with different P sorption capacities (iron and aluminum dominated slight acid Red earth and calcium dominated alkaline Fluvo-aquic soil). A 42-day incubation experiment was conducted to study how applications of biochar at different rates (0, 2, 4, and 8 % soil, w/w), in combination with and without mineral KH2PO4 fertilizer, affected contents of soil Olsen-P and soil microbial biomass P (SMB-P) and phosphomonoesterase activity. In addition, P sorption characteristics of soils amended with biochar, as well as main properties of the biochar and the soils, were determined. Application of 8 % biochar after 42 days of incubation substantially increased soil Olsen-P from 3 to 46 mg kg(-1) in Red earth and from 13 to 137 mg kg(-1) in Fluvo-aquic soil and increased SMB-P from 1 to 9 mg kg(-1) in Red earth and from 9 to 21 mg kg(-1) in Fluvo-aquic soil. The increase was mainly due to high concentrations of P in the ash fraction (77 % of total biochar P). Biochar effect on soil Olsen-P and SMB-P increased by higher biochar application rates and by lower P sorption capacity. Biochar application significantly reduced acid phosphomonoesterase activity in Red earth and alkaline phosphomonoesterase activity in Fluvo-aquic soil due to large amount of inorganic P added. We conclude that maize straw biochar is promising to potentially improve soil P availability in low-P soils, but further research at field scale is needed to confirm this.

分类号： S15

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