数字农科院2.0

干湿交替对铈锰改性生物炭固定红壤 粤泽 的影响

文献类型： 中文期刊

作者： 黄晓雅;;李莲芳;;朱昌雄;;黄金丽;;吴翠霞;;叶婧

作者机构：

关键词： 改性生物炭;;砷;;干湿交替;;pH值;;水溶态As

期刊名称：环境科学

ISSN： 0250-3301

年卷期： 2021 年

页码：

收录情况： EI（2021版） ; 北大核心（2020版） ; CSCD（2020-2021年度） ; 科技核心（2020版）

摘要： 以砷（As）污染红壤为研究对象，通过静态培养试验，探讨了铈锰改性生物炭（cerium-manganese modified biochar, MBC）在干湿交替老化条件下对红壤中 As 的固定效应。结果表明，与常规培养比 较，干湿交替条件下 MBC 的施用显著降低了红壤中水溶态 As（WSAs）含量（P<0.05）和 pH 值， 且随着材料用量的增加和培养时间的延长而持续降低，试验结束时，土壤 pH 值比常规条件下降低 了 0.08~0.16 个单位。与此同时，干湿交替条件下添加 MBC 后的土壤 WSAs 显著下降，当培养至 30 d 时，WSAs 相比于常规培养降低了 38.73%~51.94%，比试验初期降低了 45.64%~56.19%，未添加 MBC 的处理在两种培养模式下土壤 WSAs 含量和 pH 值均显著升高（P<0.05），其中以干湿交替处 理更为明显。从红壤中 As 赋存形态看，当培养试验结束时，相比于常规培养而言，干湿交替模式下 MBC 的施用使土壤中非专性吸附态 As（F1）降低了 33.16%~36.00%，专性吸附态 As（F2）降低了 7.67%~11.99%，残渣态 As（F5）增加了 15.43%~42.45%，且土壤 As 的迁移系数 M 亦显著低于常规 培养（P<0.05），降幅为 9.02%~12.75%；而未添加 MBC 的处理土壤 As 活化明显，且以干湿交替条 件下更甚。整体上看，干湿交替水分管理有利于 MBC 对红壤中 As 的固定，MBC 修复 As 污染红壤 具有良好的稳定性和应用潜力。

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