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Populations of Dalapon-decomposing Bacteria in Soil as Influenced by Additions of Dalapon or Other Carbon Sources

机译:添加达拉彭或其他碳源对土壤中达拉蓬分解细菌的种群的影响

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The numbers of bacteria capable of decomposing the herbicide dalapon were determined for five soils by the most-probable-number method. Before treatment of the soils with dalapon, the numbers varied from 1,000 to 10,000 cells per g of soil. Incubation of the soils with dalapon resulted in large increases (100-fold) in two of three soils in which dalapon was decomposed rapidly. Lack of increase in numbers in spite of rapid decomposition in the other soil probably indicated breakdown by a chemical process or decomposition by fungi. In the remaining two soils, in which decomposition was slow in one and did not occur in the other, the initial numbers were at the low end of the range and the increase was small on incubation with dalapon. Addition of ground alfalfa or ground corn plant material to a soil did not result in significant increases in the numbers of dalapon-decomposing bacteria, either during or after decomposition of the plant material. Glucose depressed the rate of breakdown of dalapon in the soil and increased dalapon-decomposing Bacillus species rather than Arthrobacter and Agrobacterium species, which were found to increase on incubation with dalapon itself. The most-probable-number method appears to be a valuable tool for pesticide-ecology studies.
机译:通过最可能数法确定了五种土壤中能够分解除草剂达拉蓬的细菌数。在用达拉蓬处理土壤之前,每克土壤中的细胞数量从1,000到10,000个不等。将土壤与达拉蓬一起孵育会导致迅速分解达拉蓬的三种土壤中的两种土壤增加(100倍)。尽管在其他土壤中迅速分解,但数量却没有增加,这可能表明化学过程导致了分解或真菌分解了。在剩下的两种土壤中,其中一种分解较慢,而另一种则没有分解,初始数量处于该范围的低端,与达拉蓬一起孵育时,其增加很小。在植物材料的分解过程中或分解后,向土壤中添加苜蓿粉或玉米粉植物材料不会导致分解达拉蓬的细菌数量显着增加。葡萄糖抑制了土壤中达拉蓬的分解速度,并增加了达拉蓬分解的芽孢杆菌属物种,而不是节杆菌和农杆菌物种,后者在与达拉蓬自身孵育后会增加。数量最多的方法似乎是农药生态学研究的宝贵工具。

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