Application of biochar-based metal oxide nanocomposites can acquire new composites and combine the benefits of biochar with nanomaterials. For the first time, this research was conducted to evaluate the possible effects of solid biochar (25 g biochar kg⁻¹ soil) and biochar-based nanocomposites (BNCs) of magnesium oxide (25 g BNC-MgO kg⁻¹ soil), manganese oxide (25 g BNC-MnO biochar kg⁻¹ soil) and combined use of these nanocomposites (12.5 g BNC-MgO + 12.5 g BNC-MnO kg⁻¹ soil) on salt (non-saline, 6 and 12 dSm⁻¹ NaCl salinities) tolerance of safflower plants (Carthamus tinctorius L.). Salinity reduced potassium, magnesium and manganese contents in root and leaf tissues, chlorophyll content index, photosynthetic pigments, maximum quantum yield of photosystem II (Fv/Fm) and relative photosynthetic electron transport rate (RETR), leaf water content and plant biomass, but increased the sodium content, reactive oxygen species generation (ROS), oxidative stress and antioxidants and ROS detoxification potential of safflower roots and leaves. Application of biochar and BNCs increased the contents of potassium, manganese and magnesium in plant tissues, photosynthetic pigments, Fv/Fm and RETR, leaf water content and reduced sodium accumulation, ROS generation and oxidative stress under saline conditions, leading to a higher plant biomass in comparison with control. The BNC-MgO + BNC-MnO was the superior treatment on reducing salt toxicity. This treatment reduced oxidative stress by enhancing photosynthetic pigments, Fv/Fm and RETR of safflower under salt stress. These results revealed that BNCs have a great potential for improving salt tolerance of plants through increasing RETR and decreasing sodium accumulation and ROS generation.

基于生物炭的金属氧化物纳米复合材料的应用可以获得新的复合材料，并将生物炭的优点与纳米材料相结合。这项研究首次进行，以评估固体生物炭（25 g生物炭kg ^-1土壤）和氧化镁（25 g BNC-MgO kg ^-1土壤），锰的生物炭基纳米复合材料（BNC）的可能作用。氧化物（25克BNC-MnO生物炭kg ^-1土壤）和这些纳米复合材料（12.5克BNC-MgO + 12.5克BNC-MnO kg ^-1土壤）在盐（非盐，6和12 dSm ^-1 NaCl上）的组合使用盐度）对红花植物的耐受性（红花（carthhamus tinctorius）L.）。盐度降低了根和叶组织中的钾，镁和锰含量，叶绿素含量指数，光合色素，光系统II的最大量子产率（Fv / Fm）和相对光合电子传输速率（RETR），叶中的水分含量和植物生物量，但是增加了红花根和叶的钠含量，活性氧生成（ROS），氧化应激和抗氧化剂以及ROS解毒的潜力。生物炭和BNC的施用增加了植物组织中钾，锰和镁的含量，光合色素，Fv / Fm和RETR，叶水含量并减少了盐分条件下钠的积累，ROS的产生和氧化胁迫，导致植物生物量更高与对照相比。BNC-MgO + BNC-MnO是降低盐毒的优良方法。该处理通过增强盐胁迫下红花的光合色素，Fv / Fm和RETR来减轻氧化应激。这些结果表明，BNC具有通过增加RETR并减少钠积累和ROS产生来提高植物耐盐性的巨大潜力。