Agro-environmental Protection Institute, Ministry of Agriculture of China, Tianjin, 300191, China.
Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, 453002, China.
Environ Pollut. 2019 Jan;244:600-607. doi: 10.1016/j.envpol.2018.10.011. Epub 2018 Oct 4.
This study aimed to determine the effects of FeMn modified biochar composite (FMBC) treatment on the pH, redox properties, enzyme activities, and bacterial communities of As-polluted paddy soil. The two utilized FMBCs (FMBC and FMBC) exhibited markedly different effects on soil pH, and treatment with biochar (BC) or FMBCs increased the soil redox potential and reduced the content of available As, facilitating the conversion of originally present non-specifically sorbed and specifically bound As forms to residual, amorphous hydrous oxide-bound, and crystalline hydrous oxide-bound ones. In general, the activities of soil enzymes increased after the above treatments, with the exception of that of alkaline phosphatase, which decreased upon supplementation with FMBC. Supplementation with BC or FMBCs increased the abundance of Proteobacteria and Firmicutes, decreasing that of Bacteroidetes. Notably, FMBC and FMBC affected soil properties in different ways, although the mechanisms of the corresponding influence were similar. Thus, treatment with BC-based materials changed the distribution of As and the activities of soil enzymes, additionally affecting a variety of other physicochemical soil properties to make it suitable for microbial growth.
本研究旨在确定 FeMn 修饰生物炭复合材料（FMBC）处理对砷污染稻田土壤 pH 值、氧化还原性质、酶活性和细菌群落的影响。两种使用的 FMBC（FMBC 和 FMBC）对土壤 pH 值表现出明显不同的影响，生物炭（BC）或 FMBC 的处理增加了土壤氧化还原电位并降低了有效砷的含量，促进了原本非特异性吸附和特异性结合的砷形态向残余的无定形水合氧化物结合态和结晶水合氧化物结合态的转化。一般来说，上述处理后土壤酶的活性增加，除了 FMBC 处理会降低碱性磷酸酶的活性。BC 或 FMBC 的添加增加了变形菌门和厚壁菌门的丰度，降低了拟杆菌门的丰度。值得注意的是，FMBC 和 FMBC 以不同的方式影响土壤性质，尽管相应影响的机制相似。因此，基于 BC 的材料的处理改变了砷的分布和土壤酶的活性，此外还影响了其他各种物理化学土壤性质，使其适合微生物生长。
