Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.7717/peerj.3377 |
Primary productivity as a control over soil microbial diversity along environmental gradients in a polar desert ecosystem | |
Geyer, Kevin M.1; Takacs-Vesbach, Cristina D.2; Gooseff, Michael N.3,4; Barrett, John E.5 | |
通讯作者 | Geyer, Kevin M. |
来源期刊 | PEERJ
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ISSN | 2167-8359 |
出版年 | 2017 |
卷号 | 5 |
英文摘要 | Primary production is the fundamental source of energy to foodwebs and ecosystems, and is thus an important constraint on soil communities. This coupling is particularly evident in polar terrestrial ecosystems where biological diversity and activity is tightly constrained by edaphic gradients of productivity (e.g., soil moisture, organic carbon availability) and geochemical severity (e.g., pH, electrical conductivity). In the McMurdo Dry Valleys of Antarctica, environmental gradients determine numerous properties of soil communities and yet relatively few estimates of gross or net primary productivity (GPP, NPP) exist for this region. Here we describe a survey utilizing pulse amplitude modulation (PAM) fluorometry to estimate rates of GPP across a broad environmental gradient along with belowground microbial diversity and decomposition. PAM estimates of GPP ranged from an average of 0.27 mmol O-2/m(2)/s in the most arid soils to an average of 6.97 mmol O-2/m(2)/s in themost productive soils, the latter equivalent to 217 g C/m(2) /y in annual NPP assuming a 60 day growing season. A diversity index of four carbon-acquiring enzyme activities also increased with soil productivity, suggesting that the diversity of organic substrates in mesic environments may be an additional driver of microbial diversity. Overall, soil productivity was a stronger predictor of microbial diversity and enzymatic activity than any estimate of geochemical severity. These results highlight the fundamental role of environmental gradients to control community diversity and the dynamics of ecosystem-scale carbon pools in arid systems. |
英文关键词 | Microbial ecology Pulse amplitude modulation fluorometry Primary production McMurdo Dry Valleys Biogeochemistry Environmental gradients |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000406376700011 |
WOS关键词 | ANTARCTIC DRY VALLEY ; MODULATION PAM FLUOROMETRY ; ELECTRON-TRANSPORT RATES ; SOUTHERN VICTORIA LAND ; ORGANIC-MATTER ; TAYLOR VALLEY ; ROSS SEA ; CO2 FLUX ; COMMUNITY ; BIODIVERSITY |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/201406 |
作者单位 | 1.Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA; 2.Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA; 3.Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80309 USA; 4.Univ Colorado, Dept Civil Environm & Architectural Engn, Boulder, CO 80309 USA; 5.Virginia Tech, Dept Biol Sci, Blacksburg, VA USA |
推荐引用方式 GB/T 7714 | Geyer, Kevin M.,Takacs-Vesbach, Cristina D.,Gooseff, Michael N.,et al. Primary productivity as a control over soil microbial diversity along environmental gradients in a polar desert ecosystem[J],2017,5. |
APA | Geyer, Kevin M.,Takacs-Vesbach, Cristina D.,Gooseff, Michael N.,&Barrett, John E..(2017).Primary productivity as a control over soil microbial diversity along environmental gradients in a polar desert ecosystem.PEERJ,5. |
MLA | Geyer, Kevin M.,et al."Primary productivity as a control over soil microbial diversity along environmental gradients in a polar desert ecosystem".PEERJ 5(2017). |
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