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Mechanisms and application of wastes-pyrolyzed biochars in soil Cd immobilization, tobacco Cd accumulation reduction and plant growth promotion

文献类型： 外文期刊

作者： Zhang, Yongxin 1 ; Xiong, Haoqin 1 ; Li, Xiaofeng 1 ; Bi, Jue 1 ; Huan, Qin 1 ; Liu, Xue 1 ;

作者机构： 1.Southwest Forestry Univ, Coll Ecol & Environm, Yunnan Key Lab Plateau Wetland Conservat Restorat, Kunming 650224, Yunnan, Peoples R China

2.Natl Wetland Ecosyst Fixed Res Stn Yunnan Dianchi, Kunming 650224, Yunnan, Peoples R China

3.Yunnan Acad Agr Sci, Inst Trop & Subtrop Cash Crops, Kunming 678000, Yunnan, Peoples R China

关键词： Cadmium; Tobacco; Immobilization; Bioaccumulation; Soil remediation

期刊名称：INDUSTRIAL CROPS AND PRODUCTS （ 影响因子：6.2； 五年影响因子：6.2 ）

ISSN： 0926-6690

年卷期： 2025 年 233 卷

页码：

收录情况： SCI

摘要： Tobacco is a typical cadmium (Cd) accumulator, which however, also an important cash crop. Fixing Cd in soils is critical to decrease its phytoavailability and accumulation in tobacco. Biochars were produced by pig manure, cow manure and corn straw (PMB, CMB and CSB) under 350 degrees C, 500 degrees C and 700 degrees C, and applied to 0.83 or 12 mg kg-1 Cd-spiked soils. The results showed that biochar amendment reduced soil available Cd and tobacco Cd contents by 22.1-38.9 % and 2.9-72.6 % in 0.83 mg kg-1 Cd-spiked soils. The reduced soil Cd availability was related to the elevated soil pH (R=-0.36). In addition, biochars promoted tobacco growth (0.83-5.03 g plant-1 fw). Specifically, PMB500 was the most efficient and outperformed PMB700 in reducing soil Cd availability and plant accumulation. This was attributed to the small pore size (13.6 nm), high OM content (51.6 mg g-1), rich functional groups, and high contents of calcite (CaCO3; 11.5 %), albite (Na(AlSi3O8); 13.6 %), muscovite (KAl2.2(Si3Al)0.975O10(OH)1.72O0.28; 25.5 %), and microcline (K(AlSi3O8); 34.0 %) in PMB500. These features contributed to the efficient surface complexation (-OH, -COOH and -CHO), cation exchange (Ca2+, K+ and Al3+), and precipitation (CdCO3, CdSiO3 and Cd(OH)2) reactions between PMB500 and Cd. This suggested that Cd adsorption efficiency was feedstock type and pyrolysis temperature dependent, but high temperature is not necessarily to produce more efficient biochar. The better understand of structure-performance relationship and materialization mechanism helps to achieve desired biochars to facilitate soil remediation and agronomic application.

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