%0 Journal Article
%T Single and joint effects of pesticides and mercury on soil urease
%A YANG Chun-lu
%A SUN Tie-hang
%A HE Wen-xiang
%A ZHOU Qi-xing
%A CHEN Su
%A <br>YANG Chun-lu
%A SUN Tie-hang
%A HE Wen-xiang
%A ZHOU Qi-xing
%A CHEN Su
%J 环境科学学报(英文版)
%D 2007
%I 
%X The influence of two pesticides including chlorimuron-ethyl and furadan and mercury (Hg) on urease activity in 4 soils (meadow burozem and phaeozem) was investigated. The soils were exposed to various concentrations of the two pesticides and Hg individually and simultaneously. Results showed that there was a close relationship between urease activity and organic matter content in soil.Chlorimuron-ethyl and furadan could both activate urease in the 4 soils. The maximum increment of urease activity by chlorimuronethyl was up to 14%-18%. There was almost an equal increase (up to 13%-21%) in the urease activity by furadan. On the contrary, Hg markedly inhibited soil urease activity. A logarithmic equation was used to describe the relationship (P＜0.05) between the concentration of Hg and the activity of soil urease in the 4 tested soils. Semi-effect dose (ED50) values by the stress of Hg based on the inhibition of soil urease in the 4 soils were 88, 5.5, 24 and 20 mg/kg, respectively, according to the calculation of the corresponding equations. The interactive effect of chlorimuron-ethyl or furadan with metal Hg on soil urease was mainly synergic at the highest tested concentrations.
%K chlorimuron-ethyl
%K furadan
%K mercury
%K soil urease
%K combined pollution
%K urease
%K soil
%K mercury
%K pesticides
%K effects
%K joint
%K interactive effect
%K metal
%K calculation
%K equations
%K values
%K stress
%K based
%K inhibition
%K dose
%K concentration
%K activity
%K logarithmic
%K used
%K increase<br>农药
%K 尿素酶
%K 汞元素
%K 土壤
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=6CB1530875F53489BF1E81BD87B7F5E6&aid=3E119598D6410E2B8462AA61D5493D71&yid=A732AF04DDA03BB3&vid=2A8D03AD8076A2E3&iid=0B39A22176CE99FB&sid=AA27B676BFCAA4BE&eid=CEC789B3C68C3BB3&journal_id=1001-0742&journal_name=Journalofenvironmentalsciences(China)&referenced_num=4&reference_num=24