胡敏酸对土壤中DnBP降解动力学及微生物活性的影响  

Effect of Humic Acid on Degradation Kinetics and Microbial Activity of DnBP in Soil

作　　者：李玉双 刘厶瑶 宋雪英 侯永侠 徐硕 魏建兵 赵晓旭 LI Yushuang;LIU Siyao;SONG Xueying;HOU Yongxia;XU Shuo;WEI Jianbing;ZHAO Xiaoxu(College of Environment, Shenyang University, Shenyang 110044, China;College of Environmental and Biological Engineering, Putian University, Putian 351100, China)

机构地区：[1]沈阳大学环境学院,辽宁沈阳110044 [2]莆田学院环境与生物工程学院,福建莆田351100

出　　处：《沈阳大学学报（自然科学版）》2020年第2期115-122,共8页Journal of Shenyang University：Natural Science

基　　金：国家自然科学基金青年科学基金资助项目(21307084);国家自然科学基金面上资助项目(41771200,41171399);辽宁省自然科学基金资助项目(2019-ZD-0550);生态环境及其信息图谱福建省高等学校重点实验室(莆田学院)开放经费资助课题(ST19003).

摘　　要：以邻苯二甲酸正二丁酯(di-n-butyl phthaiate,DnBP)为供试污染物,研究了胡敏酸(humic acid,HA)对土壤中DnBP的降解动力学过程及土壤微生物活性的影响规律.结果表明,土壤湿度为最大持水量的60%,温度25℃条件下,DnBP在潮棕壤中的降解半衰期为5.069 d,而用HA处理后,促进了DnBP的降解,HA施加质量分数为10~160 mg·g-1时,DnBP的半衰期为2.843~4.532 d.HA的施加促进了土壤基础呼吸,增强了土壤过氧化氢酶和脱氢酶的活性.DnBP的降解率与土壤呼吸强度、过氧化氢酶活性呈极显著正相关关系,与土壤脱氢酶活性呈显著正相关关系;而HA的添加量与土壤脱氢酶活性也表现出显著正相关关系;土壤呼吸强度和过氧化氢酶活性与土壤DnBP降解率之间具有较高的直接通径系数和综合通径系数.Using di-n-butyl phthaiate(DnBP)as test pollutant,the effects of humic acid(HA)on the degradation kinetics of soil DnBP and soil microbial activity were studied.The results show that the soil moisture was 60%of the maximum water holding capacity.Under 25℃,the degradation half-life of DnBP in aquic brown soil was 5.069.HA treatment promoted the degradation of DnBP.The applied mass fraction of HA was 10~160 mg·g-1,the half-life of DnBP is from 2.843 to 4.532 days.The application of HA promoted soil basic respiration and enhanced soil catalase and dehydrogenase activities.The degradation rate of DnBP has a very significant positive correlation with soil respiration intensity and catalase activity,and a significant positive correlation with soil dehydrogenase activity;and the addition of HA also has a significantly positive correlation with soil dehydrogenase activity.Correlation relationship;there is a high direct and comprehensive path coefficient between soil respiration intensity and catalase activity and soil DnBP degradation rate.

关 键 词：DNBP 降解动力学 胡敏酸 土壤基础呼吸 土壤酶活性 

分 类 号：X53[环境科学与工程—环境工程]