Two kinds of petrophifle plants (Pogonatherum panideum and Erioophorum comosum) are broadly grown on the rock slope of roads in the southwest of China. The microfloras in the soil nearby the rhizosphere of two kinds o...Two kinds of petrophifle plants (Pogonatherum panideum and Erioophorum comosum) are broadly grown on the rock slope of roads in the southwest of China. The microfloras in the soil nearby the rhizosphere of two kinds of petrophifle plants were studied in different month in order to investigate the pattern of ecological distribution of soil microbes. The results of incubation by the dilution plate count showed the amount of soil microbes significantly varied with time. The amount of microbes in the soil under P. panideum got the peak in May, then decreased in September, November, July, March and January; and to E. comosum, the amount of soil microorganisms was greater in September than in other months and became less in November, May, March, January and July. Preliminary analysis showed there were the differences of soil microbial composition between two kinds of petrophifle plants; Bacteria was superiority in soil under P. panideum, while the average ratio of actinomyces was the greatest among the main soil microbial populations under E. comosum. Besides, 10 genera of heterotrophic bacteria, 13 genera of heterotrophic filamentous fungi and 2 genera of heterotrophic actinomyces were identified, P.asymmetrica, Trichoderma, Fusarium, Paecilomyces, Cladosporium, Griserubro_violaceus, Albosporus, Gloucus, Aureus, Cinereus, Grideofuseus, Bacillus and Pseudomonas were dominant in soils under two kinds of petrophifle plants, and it indicated the dominant genera of soil microbes were varied with season turning. When biochemical activities of soil microbes were detected, we found 42.7% of microbes excreted amylase and 53.4% of microbes could decompose cellulose.展开更多
文摘Two kinds of petrophifle plants (Pogonatherum panideum and Erioophorum comosum) are broadly grown on the rock slope of roads in the southwest of China. The microfloras in the soil nearby the rhizosphere of two kinds of petrophifle plants were studied in different month in order to investigate the pattern of ecological distribution of soil microbes. The results of incubation by the dilution plate count showed the amount of soil microbes significantly varied with time. The amount of microbes in the soil under P. panideum got the peak in May, then decreased in September, November, July, March and January; and to E. comosum, the amount of soil microorganisms was greater in September than in other months and became less in November, May, March, January and July. Preliminary analysis showed there were the differences of soil microbial composition between two kinds of petrophifle plants; Bacteria was superiority in soil under P. panideum, while the average ratio of actinomyces was the greatest among the main soil microbial populations under E. comosum. Besides, 10 genera of heterotrophic bacteria, 13 genera of heterotrophic filamentous fungi and 2 genera of heterotrophic actinomyces were identified, P.asymmetrica, Trichoderma, Fusarium, Paecilomyces, Cladosporium, Griserubro_violaceus, Albosporus, Gloucus, Aureus, Cinereus, Grideofuseus, Bacillus and Pseudomonas were dominant in soils under two kinds of petrophifle plants, and it indicated the dominant genera of soil microbes were varied with season turning. When biochemical activities of soil microbes were detected, we found 42.7% of microbes excreted amylase and 53.4% of microbes could decompose cellulose.
