改性沸石改良底泥对土壤中微生物生物量碳及酶活性的影响

发布时间：2018-08-23 15:01

【摘要】：为了减小底泥中重金属的活性,实现底泥回田再利用,以洞庭湖重金属污染底泥为实验对象,探究以Na Cl和壳聚糖改性沸石改良的底泥对土壤中微生物生物量碳和生物酶(脲酶和脱氢酶)活性的影响。实验结果表明,两种沸石改良底泥添加后,土壤中水溶态金属浓度减小。Na Cl改性沸石处理组(沸石/底泥质量比3/7)和壳聚糖改性沸石处理组(沸石/底泥质量比1/9、3/7和6/4)中微生物量碳含量增加,微生物量C/N比最大提高至原来的2.8倍。壳聚糖改性沸石添加底泥对土壤生物酶影响较Na Cl改性沸石明显,土壤脲酶和脱氢酶活性随壳聚糖改性沸石投加量的增加而明显提升,壳聚糖改性沸石最大投加量组中(6/4)脲酶和脱氢酶活性较对照组分别增大1.1、1.6倍。
[Abstract]:In order to reduce the activity of heavy metals in sediment and realize the reuse of sediment, the sediment contaminated by heavy metals in Dongting Lake was used as experimental object. The effects of modified mud modified by NaCl and chitosan on microbial biomass carbon and enzyme (urease and dehydrogenase) activity in soil were investigated. The experimental results show that the two zeolites are added to the modified sediment. The microbial biomass carbon content increased in the water soluble metal concentration decreased. NaCl modified zeolite treatment group (zeolite / sediment mass ratio 3 / 7) and chitosan modified zeolite treatment group (zeolite / sediment mass ratio 1 / 9 / 3 / 7 and 6 / 4) increased microbial biomass carbon content. The microbial biomass C / N ratio was 2.8 times higher than that of the original one. The soil enzyme activity of soil urease and dehydrogenase increased with the increase of the dosage of chitosan modified zeolite, and the effect of adding mud on soil enzyme was more obvious than that of NaCl modified zeolite. The activities of urease and dehydrogenase in the group with the maximum dosage of chitosan modified zeolite (6 / 4) increased by 1. 11 ~ 1. 6 times as compared with the control group, respectively.
【作者单位】：湖南大学环境科学与工程学院;环境生物与控制教育部重点实验室(湖南大学);
【基金】：国家自然科学基金项目(51409099,51521006) 中央高校基本科研业务费(531107040752)~~
【分类号】：S154

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