Arid
DOI10.1098/rspb.2008.0808
The earliest stages of ecosystem succession in high-elevation (5000 metres above sea level), recently deglaciated soils
Schmidt, S. K.1; Reed, Sasha C.1,2; Nemergut, Diana R.2,3; Grandy, A. Stuart4; Cleveland, Cory C.5; Weintraub, Michael N.6; Hill, Andrew W.1; Costello, Elizabeth K.1; Meyer, A. F.1; Neff, J. C.4; Martin, A. M.1
通讯作者Schmidt, S. K.
来源期刊PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
ISSN0962-8452
EISSN1471-2954
出版年2008
卷号275期号:1653页码:2793-2802
英文摘要

Global climate change has accelerated the pace of glacial retreat in high-latitude and high-elevation environments, exposing lands that remain devoid of vegetation for many years. The exposure of ’new’ soil is particularly apparent at high elevations (5000 metres above sea level) in the Peruvian Andes, where extreme environmental conditions hinder plant colonization. Nonetheless, these seemingly barren soils contain a diverse microbial community; yet the biogeochemical role of micro-organisms at these extreme elevations remains unknown. Using biogeochemical and molecular techniques, we investigated the biological community structure and ecosystem functioning of the pre-plant stages of primary succession in soils along a high-Andean chronosequence. We found that recently glaciated soils were colonized by a diverse community of cyanobacteria during the first 4-5 years following glacial retreat. This significant increase in cyanobacterial diversity corresponded with equally dramatic increases in soil stability, heterotrophic microbial biomass, soil enzyme activity and the presence and abundance of photosynthetic and photoprotective pigments. Furthermore, we found that soil nitrogen-fixation rates increased almost two orders of magnitude during the first 4-5 years of succession, many years before the establishment of mosses, lichens or vascular plants. Carbon analyses (pyrolysis-gas chromatography/ mass spectroscopy) of soil organic matter suggested that soil carbon along the chronosequence was of microbial origin. This indicates that inputs of nutrients and organic matter during early ecosystem development at these sites are dominated by microbial carbon and nitrogen fixation. Overall, our results indicate that photosynthetic and nitrogen-fixing bacteria play important roles in acquiring nutrients and facilitating ecological succession in soils near some of the highest elevation receding glaciers on the Earth.


英文关键词primary succession nitrogen fixation cyanobacteria Peruvian Andes
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000260611200003
WOS关键词MICROBIAL-POPULATION DYNAMICS ; GLACIER BAY ; COMMUNITY SUCCESSION ; NITROGEN-FIXATION ; ROCKY-MOUNTAINS ; NATIONAL-PARK ; POLAR DESERT ; CRUSTS ; AVAILABILITY ; DIVERSITY
WOS类目Biology ; Ecology ; Evolutionary Biology
WOS研究方向Life Sciences & Biomedicine - Other Topics ; Environmental Sciences & Ecology ; Evolutionary Biology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/158929
作者单位1.Univ Colorado, Dept Ecol & Evolutionary Biol, Boulder, CO 80309 USA;
2.Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80309 USA;
3.Univ Colorado, Environm Studies Program, Boulder, CO 80309 USA;
4.Univ Colorado, Dept Geol Sci, Boulder, CO 80309 USA;
5.Univ Montana, Coll Forestry & Conservat, Missoula, MT 59812 USA;
6.Univ Toledo, Dept Environm Sci, Toledo, OH 43606 USA
推荐引用方式
GB/T 7714
Schmidt, S. K.,Reed, Sasha C.,Nemergut, Diana R.,et al. The earliest stages of ecosystem succession in high-elevation (5000 metres above sea level), recently deglaciated soils[J],2008,275(1653):2793-2802.
APA Schmidt, S. K..,Reed, Sasha C..,Nemergut, Diana R..,Grandy, A. Stuart.,Cleveland, Cory C..,...&Martin, A. M..(2008).The earliest stages of ecosystem succession in high-elevation (5000 metres above sea level), recently deglaciated soils.PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES,275(1653),2793-2802.
MLA Schmidt, S. K.,et al."The earliest stages of ecosystem succession in high-elevation (5000 metres above sea level), recently deglaciated soils".PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES 275.1653(2008):2793-2802.
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