干旱区生态环境知识资源中心(Arid): Characterization and formation of the pristine rhizoliths around Artemisia roots in dune soils of Tengeri Desert, NW China

Arid

DOI	10.1016/j.catena.2020.104633
	Characterization and formation of the pristine rhizoliths around Artemisia roots in dune soils of Tengeri Desert, NW China
	Sun, Qingfeng; Zamanian, Kazem; Huguet, Arnaud; Fa, Keyu; Wang, Hong
通讯作者	Sun, QF
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2020
卷号	193
英文摘要	Rhizoliths are the products of mineralization, petrification, or fossilization around and/or within plant roots. Among them, carbonate rhizoliths are the most common. Pristine carbonate rhizoliths with co-existing plant root relicts in the Tengeri Desert, NW China were studied, with a combination of intensive field observations and laboratory methods such as microscopy, scanning electronic microscopy, energy dispersive X-ray spectra, radiocarbon dating, and isotope mass spectrometer. The field observations revealed that the pristine rhizoliths are only present at the sites where Artemisia sphaerocephala Krasch are growing i.e. in swales among sand dunes. Soil moisture of the swales is the main controlling factor of rhizoliths formation. It is in turn affected by the soil physical properties, landscape position, and climate variability, consistent with the locations of sampled rhizoliths in the swales where Artemisia plants are mostly distributed. The C-14 AMS dating indicated that the rhizoliths are much older (4000-5000 years) than their co-existing modern plant root relicts in agreement with field observations. Morphological, mineralogical and isotopic analyses revealed that carbon sources used for the rhizoliths formation were partially derived from decomposing plant roots but with significant contribution from dissolution of lithogenic carbonates. The calcium sources were suggested to be the in situ weathering of minerals (mostly lithogenic carbonates) and the pressure-dissolution of carbonates. Enough CO2 from the root decomposition have triggered carbonate accumulation around the root to form rhizoliths. Other minor chemical components of the root are S, N, P, which produce acidic water with the negative ions of SO42-, NO3-, PO43-, have also favored acidic soil environment and enhanced carbonate dissolution and mineral weathering. Redox environment around Artemisia roots were also observed to be a key factor for the pristine rhizolith formation. The pristine rhizoliths were preferentially formed in semi-closed redox condition with water nearly always available at intermediate depths. In addition, they were formed through carbonate epidiagenesis in shallow soils of the desert. Altogether, our results showed that the formation of the pristine rhizoliths was affected by the combination of several environmental factors. This led us to propose a conceptual model of rhizolith formation in desert soils.
英文关键词	Pristine rhizoliths Dune soil Redox condition Artemisia roots Soil moisture Carbonatization
类型	Article
语种	英语
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000538770800012
WOS关键词	CALCRETE LAMINAR CRUSTS ; BADAIN JARAN ; PEDOGENIC CARBONATE ; RIVER-BASIN ; NEW-MEXICO ; ENVIRONMENTAL-CHANGES ; MAJOR CONTRIBUTOR ; INORGANIC CARBON ; ORGANIC-MATTER ; CLIMATE-CHANGE
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
来源机构	北京师范大学 ; 北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/324667
作者单位	[Sun, Qingfeng] Northwest Normal Univ, Dept Geog, Lanzhou 730070, Gansu, Peoples R China; [Zamanian, Kazem] Georg August Univ Goettingen, Dept Soil Sci Temperate Ecosyst, Buesgenweg 2, D-37077 Gottingen, Germany; [Huguet, Arnaud] Sorbonne Univ, Biogeochem Dept, CNRS, METIS UMR 7619, Paris, France; [Fa, Keyu] Beijing Forestry Univ, Sch Soil & Water Conservat, Beijing 100083, Peoples R China; [Wang, Hong] Beijing Normal Univ, Interdisciplinary Res Ctr Earth Sci Frontier, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Sun, Qingfeng,Zamanian, Kazem,Huguet, Arnaud,et al. Characterization and formation of the pristine rhizoliths around Artemisia roots in dune soils of Tengeri Desert, NW China[J]. 北京师范大学, 北京林业大学,2020,193.
APA	Sun, Qingfeng,Zamanian, Kazem,Huguet, Arnaud,Fa, Keyu,&Wang, Hong.(2020).Characterization and formation of the pristine rhizoliths around Artemisia roots in dune soils of Tengeri Desert, NW China.CATENA,193.
MLA	Sun, Qingfeng,et al."Characterization and formation of the pristine rhizoliths around Artemisia roots in dune soils of Tengeri Desert, NW China".CATENA 193(2020).