Chemical characterization of microbial-dominated soil organic matter in the Garwood Valley, Antarctica

Feng, Xiaojuan; Simpson, André J.; Gregorich, E.G.; Elberling, Bo; Hopkins, D. W.; Sparrow, Ashley D.; Novis, Phil M.; Greenfield, L. G.; Simpson, Myrna J.

doi:10.1016/j.gca.2010.08.019

Cited by 29 publications

(19 citation statements)

References 63 publications

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“…Feng et al . (2010) suggested that spatially redistributed algal biomass is turned over quickly by heterotrophs; hence our results do not necessarily contradict the spatial subsidy hypothesis. However, they do support the contention of Feng et al .…”

Section: Discussionsupporting

confidence: 38%

Chlorophyta, Xanthophyceae and Cyanobacteria in Wright Valley, Antarctica

Novis

Aislabie

Turner³

et al. 2015

Antartic science

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Wright Valley, Victoria Land contains numerous aquatic habitats suitable for the growth of algae in summer. Excepting diatoms and lichen phycobionts, algal diversity and distribution in the valley was documented. Using cultures and environmental cloning eight cyanobacterial and 14 eukaryotic species were revealed. The cyanobacterium Microcoleus vaginatus and the chlorophycean Chlorococcum sp. 1 were the most common, both occurring in more than one habitat (ponds, soils or streams). Ponds harboured the most diverse communities. Habitat specialization was rare. Chlamydomonads were not found outside ponds, but species capable of zoospore production were able to colonize ponds and soils. Nostocalean cyanobacteria were not detected. Results suggest dispersal within and between valleys, with little evidence of Antarctic endemism. All but one cyanobacterium with similar internally transcribed spacer (ITS) length to clones from Miers Valley proved to be different species when 16S rRNA gene sequences were also considered; thus, ITS length is unreliable for assessing identity and biogeography of these cyanobacteria. Comparison with a 454 16S rRNA gene soil dataset from Wright Valley indicated the occurrence of only one of the cyanobacterial species, the distribution of which may be limited by salinity.

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Section: Discussionsupporting

confidence: 38%

Chlorophyta, Xanthophyceae and Cyanobacteria in Wright Valley, Antarctica

Novis

Aislabie

Turner³

et al. 2015

Antartic science

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“…The provenance of organic carbon in soils of the Lake Wellman region was not investigated. Much of the existing carbon is possibly derived from soil microbes as was reported for soils of the Garwood Valley (Feng et al 2010).…”

Section: Influence Of Soil On Microbial Communitiesmentioning

confidence: 88%

Microbial biomass and community structure changes along a soil development chronosequence near Lake Wellman, southern Victoria Land

et al. 2011

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Four pedons on each of four drift sheets in the Lake Wellman area of the Darwin Mountains were sampled for chemical and microbial analyses. The four drifts, Hatherton, Britannia, Danum, and Isca, ranged from early Holocene (10 ka) to mid-Quaternary (c. 900 ka). The soil properties of weathering stage, salt stage, and depths of staining, visible salts, ghosts, and coherence increase with drift age. The landforms contain primarily high-centred polygons with windblown snow in the troughs. The soils are dominantly complexes of Typic Haplorthels and Typic Haploturbels. The soils were dry and alkaline with low levels of organic carbon, nitrogen and phosphorus. Electrical conductivity was high accompanied by high levels of water soluble anions and cations (especially calcium and sulphate in older soils). Soil microbial biomass, measured as phospholipid fatty acids, and numbers of culturable heterotrophic microbes, were low, with highest levels detected in less developed soils from the Hatherton drift. The microbial community structure of the Hatherton soil also differed from that of the Britannia, Danum and Isca soils. Ordination revealed the soil microbial community structure was influenced by soil development and organic carbon.

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“…和细菌脂肪酸的转化 [5,18~20] , 包括藻类 [20] 、黏球形藻 (Gloeocapsomorpha prisca) [21] 、嗜酸细菌 (Bacillus acidocaldanus) [2,22] 、蓝细菌 [5] 、以及能利用水体氧化还原梯度的硫化物氧化菌 [23] . 长链环戊烷的检出频率较低, 且往往与长链环己烷同时出现, 如 Rundle 组页岩、白垩纪黑色页岩、海底热液口、蓝藻席、南极土壤沉积物 [8,10,18,23,24] , 表明它们可能具有相同的来源. 另外, 在许多样品中 [2,3,5,8~10,23~25] 长链环烷烃类与 C 2n 化合物同时出现指示了其相同或相似的母源特征, 而塑料来源的可能性 [12] 显然限制了该类化合物在古环境和古生态研究中的应用.…”

Section: 长链环状烃类主要包括长链环己烷和长链环戊烷前者检出报道相对较多被认为来自于浮游植物unclassified

“…(1.5~1.6 Ga)沉积物中 [2,3] , 在其后的新元古代至全新世的地质样品以及现代沉积物样品中该类化合物均有检出 [4] , 如新元古代澳大利亚 Tanana 组的埃迪亚加拉沉积物 [5] 、全新世的蓝藻藻席 [6,7] 、南极土壤沉积物 [8] 、绿藻藻质素的热解产物 [9] 等, 尤其是在中生代森诺曼阶和土仑阶的黑色页岩中检出了 12 个系列的 C 2n 化合物, 不但包括丰富的 A~D 系列化合物, 还有许多其他结构的 C 2n 化合物被发现, 如 3,3-二乙基烷烃, 3-乙基,3-甲基烷烃, 5-乙基,5-甲基烷烃等 [10] . 由于生物体中难以检测到 C 2n 支链烷烃, 而在聚乙烯塑料中能检测到 C 2n 化合物 [11,12] , 因此对于该类化合物的起源存在争议.…”

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