摘要
为探究不同刈割方式对鬼针草修复土壤镉(Cd)污染的作用.在鬼针草一个完整的生长季内,对比了持续种植处理(种植持续整个生长季,CK)、重新种植处理(生长季内种植2轮,每轮半个生长季,X1)、刈割老叶处理(X2)、距根部30 cm刈割(X3)、刈割顶端顶芽(X4)对鬼针草生长、生物量及Cd富集能力的影响.与CK相比,X1处理鬼针草株高、直径、侧芽数和平均生长速度均显著降低(P＜0.05);X3处理再生长速度和平均生长速度显著提高了34.88％、16.16％(P＜0.05);X3和X4处理株高、侧芽数和生物量显著提高(P＜0.05),地上生物量分别提高了62.16％、58.11％;X3、X4地上部Cd富集量分别显著提高了93.25％、77.64％(P＜0.05),X3处理富集系数达到最大值2.61,因此距根部30cm刈割对增强鬼针草提取土壤中Cd效果最好.
Abstract
To explore the effect of different mowing methods on the remediation of cadmium(Cd)con-taminated soil by Bidens pilosa L..A complete growing season of Bidens pilosa L.was compared for the effects of five different treatments on plant growth,biomass,and Cd accumulation capacity.The treatments included continuous planting(CK),replanting(X1),mowing old leaves(X2),mowing 30 cm from the root(X3),and mowing the top buds(X4).Compared to the CK,the X1 treatment signifi-cantly reduced the plant height,stem diameter,number of lateral shoots,and average growth rate of Bidens pilosa L.(P＜0.05);the X3 treatment significantly increased the regrowth rate and average growth rate by 34.88％and 16.16％(P＜0.05);the X3 and X4 treatments significantly increased the plant height,number of lateral shoots,and biomass(P＜0.05),with the aboveground biomass in-creasing by 62.16％and 58.11％respectively;the aboveground Cd accumulation in the X3 and X4 treatments significantly increased by 93.25％and 77.64％(P＜0.05),and the enrichment factor in the X3 treatment reached the maximum value of 2.61.Mowing 30 cm from the root has the best effect on enhancing Bidens pilosa L.'s extraction of Cd from the soil.
基金项目
国家自然科学基金资助项目(32360317)
云南省教育厅科学研究基金资助项目(2024Y153)
维普
万方数据