ABSTRACT

Use of biochars can be effective in increasing the uptake of plant nutrients and stabilizing heavy elements in the soil. The aim of this study was to investigate the effect of biochar application and lead (Pb) levels on some vegetative characteristics and concentrations of micro and macronutrients of Panicum miliaceum grown in rangeland soil under greenhouse conditions. A factorial pot experiment was conducted in a completely randomized design with four replications. The first factor includes biochars (no application of biochar (C), wheat biochar (1.5% w/w) (GB₁), wheat biochar (3% w/w) (GB₂), corn biochar (1.5% w/w) (ZB₁), corn biochar (3% w/w) (ZB₂), cotton biochar (1.5% w/w) (PB₁) and cotton biochar (3% w/w) (PB₂)) and the second factor consisted of Pb levels (0 (Pb0), 150 (Pb₁₅₀) and 300 (Pb₃₀₀) mg Pb kg⁻¹ soil). With enhancing the Pb levels from Pb₀ to Pb₃₀₀, the concentration of plant iron (10.46%), manganese (5%), and phosphorus (4.78%) were significantly reduced. While, all the biochars (GB, ZB, and PB) at the level of 3% (w/w) caused a significant increase in the concentration of Fe, Mn, P, and K of plant shoot and decreased the Pb concentration of plant shoot and root. The GB₂ treatment was more effective than other biochars in improving the vegetative characteristics, increasing nutrient concentration of the shoot, and reducing the Pb content in the shoot and root. It can be concluded that the use of biochar can be of great help in implementing breeding projects for Pb contaminated pastures.

摘要

使用生物炭可以有效增加植物养分的吸收和稳定土壤中的重元素。本研究的目的是研究生物炭应用和铅 (Pb) 水平对温室条件下在牧场土壤中生长的紫穗槐的一些营养特性和微量和大量营养素浓度的影响。以完全随机设计进行了一个因子罐实验，重复四次。第一个因素包括生物炭（未应用生物炭（C）、小麦生物炭（1.5% w/w）（GB ₁）、小麦生物炭（3% w/w）（GB ₂）、玉米生物炭（1.5% w/w ) (ZB ₁ )、玉米生物炭 (3% w/w) (ZB ₂ )、棉花生物炭 (1.5% w/w) (PB ₁) 和棉花生物炭 (3% w/w) (PB ₂ ))，第二个因素包括铅水平 (0 (Pb0)、150 (Pb ₁₅₀ ) 和 300 (Pb ₃₀₀ ) mg Pb kg ^-1土壤)。随着Pb水平从Pb ₀提高到Pb ₃₀₀，植物铁（10.46%）、锰（5%）和磷（4.78%）的浓度显着降低。而在 3% (w/w) 水平的所有生物炭 (GB、ZB 和 PB) 导致植物枝条的 Fe、Mn、P 和 K 浓度显着增加，并降低了植物的 Pb 浓度射击和生根。国标₂处理在改善营养特性、增加地上部养分浓度、降低地上部和根部铅含量方面优于其他生物炭。可以得出结论，生物炭的使用对实施铅污染牧草养殖项目有很大帮助。