Characteristics of cash crop straw biochars and their effects on soil cadmium availability

doi:10.16178/j.issn.0528-9017.20240923

Abstract

Abstract:

The purpose of this study was to investigate the characteristics of biochar derived from different cash crop straws and their effects on the availability of cadmium in soils，so as to provide theoretical basis and data support for the resource utilization of cash crop straw and the remediation of cadmium polluted soil. Sunflower，rape，cotton，corn，flax，jute，ramie and kenaf straw biochar were characterized by elemental analyzer，scanning electron microscope and Fourier transform infrared spectroscopy. A long-term soil culture experiment was conducted to study the effects of different cash crop straw biochar on cadmium availability and the long-term passivation of biochar. The results showed that the pores and surface roughness of biochar from different cash crop straw were different，and the specific surface areas of jute，kenaf and cotton straw biochar were higher. Different biochar had rich functional groups，especially oxygen-containing functional groups including hydroxyl（）and ester（）. Besides，the addition of cash crop straw biochar significantly （p<0.05） reduced the content of available cadmium in soil. Moreover，cash crop straw biochar had good long-term effect and stability on the passivation of cadmium，among which jute and ramie straw biochar had better effect.

Key words: cash crop, straw, biochar, characterization, farmland soil, cadmium

CLC Number:

S158

ZOU Lina, LIU Tingting, LUO Xiahong, CHEN Changli, LI Shaocui, ZHU Guanlin, AN Xia. Characteristics of cash crop straw biochars and their effects on soil cadmium availability[J]. Journal of Zhejiang Agricultural Sciences, 2026, 67(4): 999-1005.

Figures/Tables 4

References 18

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生物炭类型	氮元素含量/%	碳元素含量/%	氢元素含量/%	硫元素含量/%	比表面积/（m²·g^-1）	孔容/（cm³·g^-1）	平均孔径/nm
向日葵	0.26	63.59	1.33	0.17	23.37	0.016	38.77
黄麻	0.51	71.54	1.50	0.75	345.47	0.157	3.28
亚麻	0.90	74.44	2.54	0.15	74.49	0.036	2.71
油菜	0.34	67.89	1.87	0.68	53.63	0.029	8.66
玉米	1.59	59.70	1.80	0.22	3.21	0.010	27.93
苎麻	0.84	71.27	1.96	0.15	90.08	0.045	6.76
棉花	1.13	74.12	2.18	0.12	271.05	0.127	3.63
红麻	0.38	76.32	2.01	0.39	318.07	0.145	3.16

生物炭类型	氮元素含量/%	碳元素含量/%	氢元素含量/%	硫元素含量/%	比表面积/（m²·g^-1）	孔容/（cm³·g^-1）	平均孔径/nm
向日葵	0.26	63.59	1.33	0.17	23.37	0.016	38.77
黄麻	0.51	71.54	1.50	0.75	345.47	0.157	3.28
亚麻	0.90	74.44	2.54	0.15	74.49	0.036	2.71
油菜	0.34	67.89	1.87	0.68	53.63	0.029	8.66
玉米	1.59	59.70	1.80	0.22	3.21	0.010	27.93
苎麻	0.84	71.27	1.96	0.15	90.08	0.045	6.76
棉花	1.13	74.12	2.18	0.12	271.05	0.127	3.63
红麻	0.38	76.32	2.01	0.39	318.07	0.145	3.16