Biochar phosphorus fertilizer effects on soil phosphorus availability

被引：123
作者：
Li, Haixiao [1 ,2 ]
Li, Yuxin [1 ,2 ]
Xu, Yan [3 ,4 ]
Lu, Xueqiang [1 ,2 ]
机构：
[1] Nankai Univ, Coll Environm Sci & Engn, Tianjin 300350, Peoples R China
[2] Nankai Univ, Tianjin Key Lab Environm Technol Complex Trans Me, Tianjin 300350, Peoples R China
[3] Agr & Agri Food Canada, Quebec Res & Dev Ctr, 2560 Hochelaga Blvd, Quebec City, PQ G1V 2J3, Canada
[4] Laval Univ, Dept Soils & Agrifood Engn, Paul Comtois Bldg, Quebec City, PQ G1K 7P4, Canada
来源：
CHEMOSPHERE | 2020年 / 244卷
关键词：
P-laden biochar; Mineral P fertilizer; Slow-releasing; Intra-biochar diffusion; Phyto-available P; PHOSPHATE; SORPTION; DESORPTION; ADSORPTION; RUNOFF;
D O I：
10.1016/j.chemosphere.2019.125471
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Biochar is a potential material for making slow-releasing phosphorus (P) fertilizers for the sake of increasing soil P use efficiency and mitigating P losses. However, the long-term effects of P-laden biochars on soil P availability remains unconcerned. In this study, a laboratory-scale 70-days soil incubation experiment was conducted to study the effects of original and P-laden biochars on soil P availability and fractions. Two original biochars were derived from maize stalks by pyrolyzing at 350 degrees C and 600 degrees C. P was laden on those biochars by immersing biochars in saturated KH2PO4 solution for 24 h. Eight treatments were set for the incubation experiment, which were soil, soil + triple-superphosphate (TSP), soil + 350 degrees C biochar, soil + 600 degrees C biochar, soil + TSP + 350 degrees C biochar, soil + TSP + 600 degrees C biochar, soil + 350 degrees C P-laden biochar, and soil + 600 degrees C P-laden biochar. Results showed that original biochars could decrease soil available P through P adsorption. And there were no significant differences of soil P fractions under the treatments of mineral P fertilizer and P-laden biochars. Whereas, compared to mineral P fertilizer, P-laden biochars, especially 600 degrees C P-laden biochar, could maintain soil available P in a significantly higher level across the incubation. It was mainly because of the slow-releasing pattern of P laden on biochar and a more homogeneous soil P source distribution under P-laden biochar treatments. These results indicated that P-laden biochar could work as P fertilizer to improve soil P use efficiency. (C) 2019 Elsevier Ltd. All rights reserved.
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页数：8
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