铅污染下旱地红壤酸性磷酸酶活性的变化  

Change of acid phosphatase activity in a dry red soil polluted by lead

作　　者：罗运阔[1] 朱美英[1] 廖敏[2] 赵小敏[1] 

机构地区：[1]江西农业大学国土资源与环境学院,江西南昌330045 [2]浙江大学环境学院,浙江杭州310029

出　　处：《福建农林大学学报（自然科学版）》2009年第3期285-288,共4页Journal of Fujian Agriculture and Forestry University:Natural Science Edition

基　　金：江西省教育厅资助项目(GJZ-2006-142);江西农业大学青年基金资助项目(JXQJ-2005-09)

摘　　要：采用磷酸苯二钠比色法测定旱地红壤酸性磷酸酶活性,研究外添不同含量单一重金属Pb在不同培养时间土壤酸性磷酸酶活性的变化.结果表明:当Pb含量低于200 mg.kg-1时,土壤酸性磷酸酶活性随Pb浓度的提高而增强;当Pb含量高于200 mg.kg-1时,土壤酸性磷酸酶活性则随Pb含量的提高而逐渐降低,且Pb含量越高土壤酸性磷酸酶活性越低.Pb含量为200 mg.kg-1时酸性磷酸酶活性达到峰值,因此200 mg.kg-1可作为酸性磷酸酶活性转变的Pb表征临界浓度.此外,培养20 d前土壤酸性磷酸酶活性随培养时间的延长而逐渐增强,培养20 d后随培养时间的延长土壤酸性磷酸酶活性逐渐下降.因此第20天酸性磷酸酶活性最强,可作为受Pb胁迫的临界期.The change of acid phosphatase activity （APA） in dry red soil polluted by Pb with different concentrations was researched during different incubation periods. The results were as follows ： APA in the soil increased with the increase of Pb content when Pb content was below 200 mg·kg-1. APA reached a peak value when Pb content was 200 mg·kg-1. APA was obviously re- strained when Pb concentration was above 200 mg·kg-1. So 200 mg·kg-1was a Pb critical concentration of APA change. Furthermore, APA increased before 20 days of cultivation, and gradually decreased after 20 days of cultivation. Thus, APA was the strongest in twentieth day.

关 键 词：重金属 铅污染 旱地红壤 酸性磷酸酶活性 

分 类 号：S155.25[农业科学—土壤学]