Mechanisms for 1,3-Dichioropropene Dissipation in Biochar-Amended Soils

文献类型： 外文期刊

第一作者： Wang, Qiuxia

作者： Wang, Qiuxia;Cao, Aocheng;Yan, Dongdong;Gao, Suduan;Wang, Dong;Spokas, Kurt

作者机构：

关键词： biochar;fumigant;chemical degradation;adsorption isotherm

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：5.279； 五年影响因子：5.269 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Biochar, which is organic material heated under a limited supply of oxygen, has the potential to reduce fumigant emissions when incorporated in the soil, but the mechanisms are not fully understood. The objective of this study was to determine the effects of biochar properties, amendment rate, soil microbe, moisture, temperature, and soil type on the fate of 1,3-clichloropropene (1,3-D) isomers in laboratory incubation experiments by assessing the 1,3-D degradation rate and adsorption capacity. 1,3-D dissipation rates were significantly reduced due to strong adsorption by biochar, which was also strongly affected by biochar type. Following a 1% biochar amendment, the half-lives of 1,3-D in soil were increased 2.5-35 times. The half-lives of 1,3-D in soil were strongly affected by soil moisture, temperature, and amendment rate. The effects of sterilization on 1,34) degradation were much smaller in biochar-amended soils than in nonsterilized soils, which suggests the importance of abiotic pathways with biochar's presence: Dissipation of 1,3-D in biochar was divided into Adsorption (49-93%) and, chemical degradation pathways. Biochar properties, such as specific surface area (SSA), pH, water content, carbon content, and feedstock, all appeared to affect 1,3-D dissipation with potentially complex interactions. The biochar (air-dry) water content was highly correlated with 1,3-D adsorption capacity and thus can serve as an important predictor for fumigant mitigation use. The fate of the adsorbed fumigant onto biochar requires further examination on potential long-term environmental impacts before guidelines for biochar as a field practice to control fumigant emissions can be formulated.

分类号： R15`S

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