| 土壤微生物ATP、脱氢酶和尿素酶活性的ED50值评价外源镧的生物毒性(英文) |
| The ED50 Values for Assessing Lanthanum Toxicity on Microbial ATP Content and Dehydrogenase and Urease Activities of Paddy Soil |
|
| 摘要: |
| 关键词: 外源镧 土壤微生物ATP 脱氢酶活性 尿素酶活性 ED50 |
| 基金项目: |
| Abstract: Rare earths are applied widely in Chinese agriculture to improve crops nutrition and incidentally in fertilizers, as yet little is known of their effect on the biological function of the soil. An incubation experiment was performed to assess lanthanum toxicity on microbial ATP content and dehydrogenase and urease activities in paddy soil, which was assayed after adding La for 4h, 1d, 1, 4, 8, and 16 weeks. The relative ED50 values were calculated by two kinetic models (model 1 and model 2) and one sigmoidal dose-response model (model 3). Model 1 was successful in calculating the ED50 values for the ATP content, dehydrogenase and urease activities. The ED50 values relating to ATP content and dehydrogenase and urease activities were 1086.5 and 897.8 and 1112.5 mg La kg-1 soil, re-spectively. The ED50 values of ATP content and dehydrogenase activity increase with incubation time, but the ED50 value of urease activity decreases. After 16 weeks, La amendment has no inhibition of urease activity. The present dosage of mixed rare earths, about 0.15mg kg-1 soil year-1, applied in agriculture can hardly affect ATP content and dehydrogenase and urease activities in the paddy soil even over a long period. |
| Keywords: exogenous lanthanum soil microbial ATP dehydrogenase activity urease activity ED50 |
| |
| 摘要点击次数: 1258 |
| 全文下载次数: 1091 |
| 陈浮,杨桂山,曹慧,王腊春,彭补拙.土壤微生物ATP、脱氢酶和尿素酶活性的ED50值评价外源镧的生物毒性(英文)[J].无机化学学报,2002,18(8):827-832. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
