【摘要】 通过实地调查与采集重庆市巫溪县8份不同生长年限太白贝母根际区土壤,研究太白贝母根际区土壤酶活性、重金属含量的变化规律,揭示生长年限对其根际土壤中酶活性及重金属含量的影响情况.结果表明,不同生长年限太白贝母根际土壤酶活性、重金属元素含量具有显著性差异(P<0.05),呈现出不同的变化规律并具有一定的相关性.整体上,太白贝母栽培品根际土壤蛋白酶、脲酶、过氧化氢酶随着生长年限的增加呈先下降后上升的趋势,磷酸酶、蔗糖酶随着生长年限的增加呈先上升后下降的趋势,野生品根际土壤酶活性与其变化趋势不一致.随着生长年限的增加,太白贝母栽培品根际土壤Cd、Hg、Pb、Zn和Ni含量先升高后下降,As和Cu含量变化不大.野生品根际土壤重金属含量与其变化规律一致.Cd、Hg、As、Cu、Ni含量均远低于国家农用地土壤风险筛选值,Pb含量除S7(中贝)外均低于国家农用地土壤风险筛选值,Zn含量均远高于国家农用地土壤风险筛选值,土壤污染属轻度污染,应采取安全措施,以保证太白贝母的入药安全性.相关分析得知,根际土壤酶活性与重金属含量之间存在相关关系,既存在协同作用,又具有拮抗作用.更多还原

【Abstract】 In order to reveal the effects of enzyme activity and heavy metal contents in the rhizosphere soil of Fritillaria taipaiensis, 8 rhizospheric soils of Fritillaria taipaiensis were collected periodically throughout the growth years of Fritillaria taipaiensis. The soil enzyme activities and the variation rule of heavy metal content of rhizospheric soil for Fritillaria taipaiensis were studied. The results showed a significant difference(P<0.05), as well as different variation rules and a certain relative correlation between the rhizospheric soil enzyme activities and the heavy metal content of Fritillaria taipaiensis that was collected from the different growth years. Overall, the activity of soil protease, urease and catalase in the cultivated Fritillaria taipaiensis variety decreased first and then increased, while phosphatase and saccharase increased first and then decreased with the increase of years. However, the soil enzyme activities of the wild variety did not show the same trend with the cultivated variety. The content of Cd, Hg, Pb,Zn and Ni in cultivated Fritillaria taipaiensis variety increased first and then decreased, while As and Cu changed little with the increase of years. The heavy metal content of the wild variety showed the same variation trend with the cultivated variety. The content of Cd, Hg, As, Cu and Ni were much lower than the national soil use risk screening values. The content of Pb was lower than the national soil use risk screening values except S7 and the Zn content was much higher than the national agricultural land soil risk. Screening values showed a mild pollution level therefore safety measures should be taken to ensure the drug safety of Fritillaria taipaiensis. The correlation analysis showed there were the correlation between the soil enzyme activities and the heavy metal content performing the synergism and antagonism.更多还原