Short-term effects of maize residue biochar on phosphorus availability in two soils with different phosphorus sorption capacities
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- 作者：Limei Zhai ; Zhuoma CaiJi ; Jian Liu ; Hongyuan Wang…
- 关键词：Biochar ; Fluvo ; aquic soil ; Phosphorus availability ; Phosphorus sorption capacity ; Red earth ; Soil Olsen ; P
- 刊名：Biology and Fertility of Soils
- 出版年：2015
- 出版时间：January 2015
- 年：2015
- 卷：51
- 期：1
- 页码：113-122
- 全文大小：883 KB
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- 刊物主题：Life Sciences
Agriculture
Soil Science and Conservation - 出版者：Springer Berlin / Heidelberg
- ISSN：1432-0789
文摘
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? in Red earth and from 13 to 137?mg?kg? in Fluvo-aquic soil and increased SMB-P from 1 to 9?mg?kg? in Red earth and from 9 to 21?mg?kg? 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.