辐照对长江可培养微生物的影响及挑选指示微生物
Effects of irradiation on cultivable microorganisms in the Yangtze River and selection of indicator microorganisms

以长江中下游区域的水体为研究对象，通过分离纯化手段，对不同辐照剂量下长江水样中可培养微生物种类、数量进行研究. 结果显示：辐照引起可培养微生物数量大幅下降，但可培养微生物群落结构变得更加丰富. 各菌属中，黄杆菌属（Flavobacterium）受辐照影响最大，培养得到的菌落比例下降了28.98%，芽孢杆菌属（Bacillus）对辐照耐受性极强，菌落比例上升了15.78%. 同时发现了长江水体中具有指示价值的微生物d（Flavobacterium nitratireducens strain N1），为放射性污染的生物监测提供相关参考依据.
The Yangtze River water was chosen as the research object，and studied the changes of species and quantity of cultivable microorganisms in water samples under different irradiation via separations and purifications. Experimental results indicate that irradiation causes the substantial decline of cultivable microbial quantity but cultivable microbial community structure becomes more diversified. Among all genus，the Flavobacterium was found mostly affected by irradiation，the proportion of cultivable colonies decreased by 28.98% while the Bacillus has strong tolerance to irradiation，the proportion of cultivable colonies increased by 15.78%. Also，one indicator microorganism Flavobacterium nitratireducensstrain N1 was found in the Yangtze water and provided the relevant reference for using microorganisms to monitor the radioactive pollution