http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Kerfahi, D. (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Development of Soil Bacterial Communities in Volcanic Ash Microcosms in a Range of Climates
Kerfahi, D.,Tateno, R.,Takahashi, K.,Cho, H.,Kim, H.,Adams, J. M. Springer Science + Business Media 2017 Microbial ecology Vol.73 No.4
<P>There is considerable interest in understanding the processes of microbial development in volcanic ash. We tested the predictions that there would be (1) a distinctive bacterial community associated with soil development on volcanic ash, including groups previously implicated in weathering studies; (2) a slower increase in bacterial abundance and soil C and N accumulation in cooler climates; and (3) a distinct communities developing on the same substrate in different climates. We set up an experiment, taking freshly fallen, sterilized volcanic ash from Sakurajima volcano, Japan. Pots of ash were positioned in multiple locations, with mean annual temperature (MAT) ranging from 18.6 to -3 degrees C. Within 12 months, bacteria were detectable by qPCR in all pots. By 24 months, bacterial copy numbers had increased by 10-100 times relative to a year before. C and N content approximately doubled between 12 and 24 months. HiSeq and MiSeq sequencing of the 16S rRNA gene revealed a distinctive bacterial community, different from developed vegetated soils in the same areas, for example in containing an abundance of unclassified bacterial groups. Community composition also differed between the ash pots at different sites, while showing no pattern in relation to MAT. Contrary to our predictions, the bacterial abundance did not show any relation to MAT. It also did not correlate to pH or N, and only C was statistically significant. It appears that bacterial community development on volcanic ash can be a rapid process not closely sensitive to temperature, involving distinct communities from developed soils.</P>
-
-
Strong elevational trends in soil bacterial community composition on Mt. Halla, South Korea
Singh, D.,Lee-Cruz, L.,Kim, W.S.,Kerfahi, D.,Chun, J.H.,Adams, J.M. Pergamon Press ; Elsevier Science Ltd 2014 Soil biology & biochemistry Vol.68 No.-
Elevational trends in the ecology of macroorganisms have been studied extensively; by contrast very little is known of such trends in microbial diversity. Previous studies on soil bacteria have found either a diversity decline, a 'peak' in mid altitudes, or no trend with increasing elevation. Here we studied bacterial diversity and community composition in relation to elevation on Mt. Halla, Jeju Island, South Korea, a massive shield volcano. Samples were taken along two transects, from 100 m.a.s.l. to the summit at 1950 m.a.s.l., at elevational intervals of 200 m. PCR-amplified soil DNA for the bacterial 16S rRNA gene targeting V1 to V3 region was 454-pyrosequenced, and taxonomically classified against EzTaxon-e database. Elevation was the best predictor of variation in bacterial community composition along the two transects, even when considering other soil parameters. Elevation was itself highly correlated with mean annual temperature (MAT) and mean annual precipitation (MAP), suggesting that soil bacterial community composition on Mt. Halla is more strongly affected by climate than by geochemical or soil textural factors. The two transects showed certain consistent differences in bacterial phyla composition, with one transect having significantly higher abundance of Planctomycetes and Gemmatimonadetes than the other. Certain other phyla (e.g. Acidobacteria) also showed striking trends in abundance with elevation, but the trends differed between the two transects. Bacterial diversity and richness were also most strongly correlated with elevation, MAT and MAP, although soil pH explained a part of the variation. Moreover, vegetation cover type, irrespective of elevation, had an effect on soil bacterial diversity and richness. We found a 'dip' in diversity at lower mid elevations (700-1300 m) in both transects; a trend which has not been found before. Our results, when compared with other studies, emphasize that no simple rule can be applied to mountain systems in general, but that climate itself is a major influence on community composition.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
