杨晓智 郭建华* 于凯川 王树谦

为了探究重金属胁迫下生物炭对玉米幼苗生长的影响,采用盆栽水培玉米幼苗,在无Pb2+和含Pb2+对照下观察不同裂解温度制备的生物炭对玉米幼苗生长的影响。研究结果表明：生物炭滤出液对玉米种子的萌发影响不显著, WS300(300℃生物炭)促进玉米幼苗的干物质量增加了27%, WS500(500℃生物炭)促进玉米幼苗的干物质量增加了35%。在Pb2+胁迫下,不同裂解温度生物炭对培养液中的Pb2+去除率达到了25%-30%,其中PWS300(含Pb2+的300℃生物炭)促进玉米幼苗茎长增加了25%、干物质量增加了30%。由此可见,生物炭在Pb2+胁迫下对玉米幼苗生长的促进作用有虽所减弱,但依然能明显促进玉米幼苗的早期生长。

Effect of Biochar on Seed Germination and Seedling Growth of Maize under Pb2 + Stress

In order to investigate the effects of biochar on the growth of maize seedlings under heavy metal stress, potted hydroponic maize seedlings were used to observe the effects of biochar prepared at different pyrolysis temperatures on the growth of maize seedlings without Pb₂₊ and Pb₂₊. The results showed that the biochar filtrate had no significant effect on the germination of maize seeds. WS300 (300 °C biochar) promoted the dry matter quality of maize seedlings by 27%. WS500 (500 °C biochar) promoted the dry matter quality of maize seedlings. 35%. Under Pb₂₊ stress, the removal rate of Pb₂₊ in culture medium reached 25%-30% at different pyrolysis temperatures, and PWS300 (300°C biochar with Pb₂₊) increased the stem length of maize seedlings by 25% and the dry matter quality increased. 30%. It is concluded that the promotion of biochar on the growth of maize seedlings under Pb₂₊ stress is weakened, but it can still promote the early growth of maize seedlings.