PROTOZOAN GRAZING OF BACTERIA IN SOIL - IMPACT AND IMPORTANCE
PROTOZOAN GRAZING OF BACTERIA IN SOIL - IMPACT AND IMPORTANCE
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DOI：
10.1007/bf02341429
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发表时间：
1981-01-01
影响因子：
3.6
通讯作者：
CLARHOLM, M
中科院分区：
文献类型：
--
作者：
CLARHOLM, M
在田间和盆栽试验中研究了土壤中细菌和原生动物之间的相互作用。在自然条件下，总的生物活性暂时同步的大量降雨，并在实验室中，通过添加水干燥的土壤，有或没有植物。在野外，雨后细菌数量和生物量出现高峰，裸阿米巴的高峰很快就出现了。在3个调查组，鞭毛虫，纤毛虫和阿米巴，只有后者的popoulations足够大，波动的方式，表明作为细菌调节器的作用。细菌增加是短暂的，单独的阿米巴原虫可能导致60%的细菌减少。在盆栽实验中观察到细菌和原生动物的相同发展：在根的存在下，变形虫数量增加了20倍，比未种植的土壤高5倍。在种植的花盆中，阿米巴的增加足以导致观察到的整个细菌减少;但在未种植的土壤中，阿米巴的消耗仅导致细菌减少的1/3。
Interactions between bacteria and protozoa in soil were studied over 2-wk periods in the field and in a pot experiment. Under natural conditions the total biological activity was temporarily synchronized by a large rainfall, and in the laboratory by the addition of water to dried-out soil, with or without plants. In the field, peaks in numbers and biomass of bacteria appeared after the rain, and a peak of naked amoebae quickly followed. Of the 3 investigated groups, flagellates, ciliates and amoebae, only popoulations of the latter were large enough and fluctuated in a way that indicated a role as bacterial regulators. The bacterial increase was transient, and the amoebae alone probably caused 60% of the bacterial decrease. The same development of bacteria and protozoa was observed in the pot experiment: in the presence of roots, amoebic numbers increased 20 times and became 5 times higher than in the unplanted soil. In the planted pots, the amoebic increase was large enough to cause the whole bacterial decrease observed; but in the unplanted soil, consumption by the amoebae caused only 1/3 of the bacterial decrease.