干旱区生态环境知识资源中心(Arid): Soils of East Antarctic oasis: Interplay of organisms and mineral components at microscale

Arid

DOI	10.18268/BSGM2019v71n1a4
	Soils of East Antarctic oasis: Interplay of organisms and mineral components at microscale
	Sedov, Sergey 1; Zazovskaya, Elya 2; Fedorov-Davydov, Dmitriy 3; Alekseeva, Tatiana 3
通讯作者	Sedov, Sergey
来源期刊	BOLETIN DE LA SOCIEDAD GEOLOGICA MEXICANA
ISSN	1405-3322
出版年	2019
卷号	71 期号:1 页码:43-63
英文摘要	The soils of Antarctic oases-coastal as well as inland ice-free areas limited by ice sheet or ice shelves attract attention as a block of one of the most extreme terrestrial ecosystems of the Earth. The knowledge about early stages of pedogenesis, solum formation and stabilization, interaction between organic and mineral components in these soils is still limited. We performed micromorphological investigation of several thin soil profiles developed under mosses and lichens on the sediments deposited by meltwater in a lake depression of Schirmacher Oasis. Mineral components are dominated by sand particles of primary minerals (mostly quartz, K-Na feldspars and micas) derived from gneiss bedrock. Quartz grains exhibit surface structures indicative of cryogenic fragmentation, whereas biotite has signs of chemical alteration: exfoliation along cleavage planes, deformation of laminae, loss of interference colours and pleochroism. Despite severe environmental conditions, incipient weathering occurs that contribute clay minerals and iron oxides to the fine material. The latter forms discontinuous coatings on the coarse grains providing a chitonic c/f related distribution pattern. Arrangement of the fine components in form of coatings on coarse grains provides their maximal interaction with soil moisture and organic matter and generation of microhabitats for the microorganisms. Common micromorphological features of the studied soils is a complex groundmass which combines well preserved organic tissues of mosses and lichens and mineral particles spread among them. We conclude that the studied soil bodies are synsedimentary: fluvial (and possibly eolian) deposition of mineral material that occurs simultaneously with the growth of primitive plants. The mineral grains are trapped between plant tissues which form a framework of the soil matrix. This interlacing provides also conservation of organic material within the soil layer. Studied soils demonstrate similarities with the biological crusts of other present and past extreme terrestrial environments.
英文关键词	Antarctic oasis extreme ecosystems weathering biological soil crust
类型	Article ; Proceedings Paper
语种	英语
国家	Mexico ; Russia
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000455704700005
WOS关键词	NORTHERN VICTORIA LAND ; SCHIRMACHER OASIS ; SEDIMENTS ; ENVIRONMENT ; CLASSIFICATION ; PEDOGENESIS ; DISSOLUTION ; BIOFILMS ; CRYOSOLS ; GRANITE
WOS类目	Geology
WOS研究方向	Geology
来源机构	Universidad Nacional Autónoma de México
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214714
作者单位	1.Univ Nacl Autonoma Mexico, Inst Geol, Coyoacan 04510, Cdmx, Mexico; 2.Russian Acad Sci, Inst Geog, Staromonetnyi Per 29, Moscow 109017, Russia; 3.Russian Acad Sci, Inst Physicochem & Biol Problems Soil Sci, Ulitsa Inst 2, Pushchino 142290, Russia
推荐引用方式 GB/T 7714	Sedov, Sergey,Zazovskaya, Elya,Fedorov-Davydov, Dmitriy,et al. Soils of East Antarctic oasis: Interplay of organisms and mineral components at microscale[J]. Universidad Nacional Autónoma de México,2019,71(1):43-63.
APA	Sedov, Sergey,Zazovskaya, Elya,Fedorov-Davydov, Dmitriy,&Alekseeva, Tatiana.(2019).Soils of East Antarctic oasis: Interplay of organisms and mineral components at microscale.BOLETIN DE LA SOCIEDAD GEOLOGICA MEXICANA,71(1),43-63.
MLA	Sedov, Sergey,et al."Soils of East Antarctic oasis: Interplay of organisms and mineral components at microscale".BOLETIN DE LA SOCIEDAD GEOLOGICA MEXICANA 71.1(2019):43-63.