植物修复法的脲酶活性对排污河底泥中Zn的响应  

Response of Urease Activity to Zn in Sewage River Sediment under Different Phytoremediation Methods

作　　者：吴卿[1] 李冬梅[1] 赵彩云[1] 高亚洁[1] 

机构地区：[1]天津大学环境科学与工程学院,天津300072

出　　处：《中国给水排水》2012年第17期78-81,共4页China Water & Wastewater

基　　金：国家自然科学基金资助项目(50908159);国家重点基础研究发展计划(973)项目(2007CB407306)

摘　　要：选取玉米—黑麦草和印度芥菜—紫花苜蓿两种互作方式共4种植物,通过单纯植物修复、EDTA诱导植物修复、植物—菌根真菌联合修复这3种植物修复方法,对某滨海城市南排污河底泥的重金属进行植物修复研究。通过对不同植物组合、不同处理水平、不同时期土壤脲酶活性的监测,分析不同修复方法下脲酶活性变化及其与底泥中Zn浓度的关系。结果表明:①玉米在EDTA诱导下对Zn的去除率最高,为69.00%;黑麦草在植物—菌根真菌联合修复下对Zn的去除率处于第二位,为64.37%。综合来看,植物—菌根真菌联合修复方法更利于Zn污染底泥或土壤的修复。②适于Zn污染底泥修复的植物为玉米和黑麦草。黑麦草修复过程中根际土壤的脲酶活性最高,但玉米对锌的吸收量最大。③低温对脲酶活性影响较大,不利于植物对锌的吸收。The phytoremediation of heavy metals in sewage river sediment in a coastal city was investigated by single phytoremediation method, EDTA-induced phytoremediation method and plant-mycorrhizal fungi phytoremediation method. The plants used were maize, ryegrass, Indian mustard and Medicago sativa L. The change in urease activity and its relationship with zinc concentration in sediment under different phytoremediation methods were analyzed. Urease activity in soil under different plant combinations, treatment levels and treatment lengths were monitored. The results showed that the removal rate of Zn by maize under the EDTA-induced phytoremediation method was the highest at 69.00%. The removal rate of Zn by ryegrass under the plant-mycorrhizal fungi phytoremediation method was the second highest at 64.37%. Taking a comprehensive consideration, the plant-mycorrhizal fungi phytoremediation method is more suitable for remediation of sediment and soil contaminated by Zn. Plants suitable for remediation of sediment contaminated by Zn were maize and ryegrass. The urease activity in root soil during the remediation by ryegrass was the highest, and the uptake of Zn by maize was the highest. Low temperature had great influence on urease activity, and the absopption of zinc by plants should be avoided.

关 键 词：排污河道底泥 植物修复 Zn浓度 脲酶活性 

分 类 号：X522[环境科学与工程—环境工程] X173