Insights into the Formation Process and Environmental Fingerprints of Iron-Manganese Nodules in Subtropical Soils of China

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Insights into the Formation Process and Environmental Fingerprints of Iron-Manganese Nodules in Subtropical Soils of China
	Yu, XL; Fu, YN; Brookes, PC; Lu, SG
刊名	SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
	2015
卷号	79 期号:4 页码:1101—1114
关键词	FE-MN NODULES TRACE-ELEMENT ASSOCIATIONS FERROMANGANESE NODULES COMPUTED-TOMOGRAPHY SELECTIVE DISSOLUTION CARPATHIAN FOOTHILLS XANES SPECTROSCOPY CONCRETIONS OXIDES ACCUMULATION
ISSN号	0361-5995
通讯作者	Lu, SG (reprint author), Zhejiang Univ, Coll Environm & Resource Sci, Hangzhou 310058, Zhejiang, Peoples R China.
英文摘要	In this work, we collected different size Fe-Mn nodules from a Plinthudult in the subtropical region of China and studied their internal structure and the distribution of trace elements by three synchrotron-based X-ray microprobe techniques: X-ray micro-computed tomography (SR-mCT), X-ray micro-fluorescence (mu-XRF), and micro X-ray absorption near edge structures (mu-XANES). The SR-mCT images reveal that the large nodules (2-3, 3-5, and 5-8 mm in diameter) have distinct Fe and Mn concentric ring structure, while the small nodule (1-2 mm) exhibits a homogeneous fabric. The mu-XRF maps show that Mn is concentrated near the nucleus of the nodule, while Fe is more concentrated in the exterior of the nodule. The 1- to 2-mm nodule has significantly higher total porosity than the >2-mm nodules; however, the spatial distribution of pores within the nodules indicates that the >2-mm nodules have smaller >30-mm pores and show more anisotropy in the outer part than in the inner part. The porosity and pore anisotropy of the nodules were considered to affect the size and shape of Fe-Mn nodules in soil. Quantification of the ring structure for the 3- to 5-mu m nodule reconstructed the formation process of the nodule, showing that the nodule was formed through two growth stages, with each stage consisting of two and five redox processes. The internal structure of Fe-Mn nodules not only records pedo-environmental changes during the formation process but also provides ample opportunity for the adsorption and sequestration of trace elements from the soil.
语种	英语
WOS记录号	WOS:000361048300010
公开日期	2016-03-08
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/24966]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
推荐引用方式 GB/T 7714	Yu, XL,Fu, YN,Brookes, PC,et al. Insights into the Formation Process and Environmental Fingerprints of Iron-Manganese Nodules in Subtropical Soils of China[J]. SOIL SCIENCE SOCIETY OF AMERICA JOURNAL,2015,79(4):1101—1114.
APA	Yu, XL,Fu, YN,Brookes, PC,&Lu, SG.(2015).Insights into the Formation Process and Environmental Fingerprints of Iron-Manganese Nodules in Subtropical Soils of China.SOIL SCIENCE SOCIETY OF AMERICA JOURNAL,79(4),1101—1114.
MLA	Yu, XL,et al."Insights into the Formation Process and Environmental Fingerprints of Iron-Manganese Nodules in Subtropical Soils of China".SOIL SCIENCE SOCIETY OF AMERICA JOURNAL 79.4(2015):1101—1114.