镉污染对甘蔗生长、土壤微生物及土壤酶活性的影响

发布时间：2018-05-17 00:32

本文选题：甘蔗 + 镉　；参考：《西南农业学报》2017年09期

【摘要】：【目的】研究添加不同浓度外源镉(Cd)对甘蔗生长情况、土壤微生物数量及土壤酶活性的影响,为探讨Cd污染与甘蔗生长、土壤微生物学特性之间的内在关系提供参考。【方法】盆栽条件下,以糖料甘蔗为材料,采用不同Cd浓度(0、25、50、100、250、500 mg/kg)进行污染处理至甘蔗成熟期,测定其株高、茎径、蔗茎产量、土壤微生物数量及土壤酶活性。【结果】甘蔗株高、茎径和蔗茎产量随着土壤中Cd浓度的增加而降低,Cd浓度越高,抑制效应越明显;Cd污染使酶活性发生变化,随着Cd浓度的增大,特别达到100 mg/kg时,脲酶、酸性磷酸酶活性显著下降,2种土壤酶对Cd的敏感顺序为:脲酶酸性磷酸酶。Cd污染也使土壤微生物数量发生变化,真菌、细菌和放线菌量在镉浓度100 mg/kg时显著下降。相关性分析表明,真菌、细菌、放线菌、土壤脲酶活性、酸性磷酸酶活性、株高、茎径、蔗茎产量与Cd污染浓度相关显著或极显著。【结论】在盆栽种植甘蔗条件下,外源Cd污染对甘蔗生长情况、土壤微生物数量及土壤酶均产生不同程度地影响。
[Abstract]:[objective] to study the effects of different concentrations of exogenous cadmium and cadmium (CD) on the growth of sugarcane, the number of soil microorganisms and the activity of soil enzymes, in order to study CD pollution and sugarcane growth. [methods] under pot culture condition, sugarcane was used as material, different CD concentration was used to pollute sugarcane to mature stage, plant height, stem diameter and cane yield were measured. [results] the plant height, stem diameter and yield of sugarcane decreased with the increase of CD concentration in soil. With the increase of CD concentration, especially when the concentration of CD reached 100 mg/kg, the activities of urease and acid phosphatase decreased significantly. The sensitive order of the two kinds of soil enzymes to CD was as follows: the contamination of urease acid phosphatase. CD also changed the number of soil microbes, fungi. The amount of bacteria and actinomycetes decreased significantly when cadmium concentration was 100 mg/kg. The correlation analysis showed that fungi, bacteria, actinomycetes, soil urease activity, acid phosphatase activity, plant height, stem diameter, cane yield and CD pollution concentration were significantly or extremely significant. [conclusion] under the condition of potted sugarcane planting, the correlation between soil urease activity, acid phosphatase activity, plant height, stem diameter, cane yield and CD pollution concentration was significant. Exogenous CD pollution had different effects on sugarcane growth, soil microbial quantity and soil enzyme.
【作者单位】：广西农业科学院农产品质量安全与检测技术研究所;广西农业科学院甘蔗研究所;
【基金】：广西农业科学院基本科研业务专项(桂农科2016YM55);广西农业科学院基本科研业务专项团队项目(2015YT92);广西农业科学院科技发展基金项目(桂农科2017JM59)
【分类号】：S154;S566.1;X53

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