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作 者 ：姚艳红,戈峰,沈佐锐*

期 刊 ：生态学报 2010年 30卷 1期 页码：272~277

关键词：CO2浓度升高；吡虫啉；甘蓝；细菌；微生物生物量C；

Keywords:elevated CO2 concentration, imidacloprid, cabbage, bacteria, soil microbial biomass C,

摘 要 ：采用田间开顶式CO2控制气室（OTC），研究了375μL/L、750μL/L两个CO2浓度和CK、LC50、LC90 3种吡虫啉浓度处理条件下，甘蓝根际土壤细菌与非根际土壤微生物生物量C的变化。750μL/L CO2处理对甘蓝根际细菌数量显著增加（P<0.01），而在同一CO2水平下各农药处理间并无显著差异；根区土壤微生物生物量C只有在750μL/L CO2且无吡虫啉处理的条件下显著（P<0.05）下降，在LC50、LC90处理的影响下并不显著。同一CO2水平下，根区土壤微生物生物量C受农药处理的影响不明显。

Abstract:Responses of bacteria in the presence rhizosphere soil and soil microbial biomass carbon in non-rhizosphere cabbage to elevated CO2 and three concentrations of imidacloprid were examined in the open-top chambers（OTC）. Numbers of bacteria in rhizosphere soil increased significantly (P<0.01) with elevated CO2 but imidacloprid had no effect on bacteria. Microbial biomass carbon was lower in non-rhizosphere of cabbage under elevated CO2 than ambient CO2 concentrations when imidacloprid was not applied. Regardless of CO2 levels, imidacloprid affects were not significant for the numbers of bacteria in rhizosphere soil.

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