【摘要】 本研究以小白菜为试验材料,采用模拟镉污染土壤的盆栽试验,研究玉米秸秆生物炭(施用量为10 g/kg、20 g/kg、30 g/kg)对镉污染土壤中小白菜生长的影响。结果表明:与常规土壤相比,镉污染土壤中小白菜的生长受到抑制,自然伸展高度、叶片开展度和单株鲜质量均下降。在镉污染土壤中,随着小白菜的生长,土壤中镉含量降低,小白菜可食用部位镉含量增加,施用适量的玉米秸秆生物炭可有效降低土壤中镉含量,缓解镉对小白菜的胁迫,使叶绿素含量、可溶性蛋白质含量和可溶性糖含量有所增加,超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性下降。综合各项指标,发现施用20 g/kg玉米秸秆生物炭对镉污染土壤胁迫的缓解效果最佳。更多还原

【Abstract】 Using Chinese cabbage as experimental material, effects of corn-stalk biochar(10 g/kg, 20 g/kg, 30 g/kg) on the growth of Chinese cabbage in cadmium contaminated soil were studied. The results showed that the growth of Chinese cabbage in cadmium contaminated soil was inhibited, and natural extension height, leaf development and single plant fresh weight were decreased. In cadmium contaminated soil, soil cadmium content decreased, and cadmium content in edible parts increased with the growth of Chinese cabbage. The application of appropriate corn-stalk biochar could effectively reduce soil cadmium content, alleviate cadmium stress, increase the contents of chlorophyll, soluble protein and soluble sugar, decrease the activities of superoxide dismutase(SOD), peroxidase(POD) and peroxidase(CAT). In conclusion, the application of 20 g/kg corn-stalk biochar can alleviate cadmium stresse effectively.更多还原