期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 113, 期 -, 页码 71-79出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2017.05.021
关键词
Lab on a chip; Mollisol; Oxisol; Soil biogeochemical interface; SoilChip; X-ray photoelectron spectroscopy
类别
资金
- National Natural Science Foundation of China [41522107, 41430860]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB15020401]
- Youth Innovation Team Project of ISA, CAS [2017QNCXTD_GTD]
- Recruitment Program of High-End Foreign Experts of the State Administration of Foreign Experts Affairs [GDT20154300073]
Many soil functions are modulated by processes at soil biogeochemical interfaces (BGIs). However, characterizing the elemental dynamics at BGIs is hampered by the heterogeneity of soil microenvironments. In order to investigate the processes of BGI formation in an upland soil (Mollisol) and a paddy soil (Oxisol), we developed a SoilChip method by assembling dispersed soil particles onto homogeneous 800 mu m-diameter microarray chips and then submerging them in a solution that contained dissolved organic matter (OM) extracted from one of the two soils. The chips with Mollisol particles were incubated at 95-100% humidity, whereas the chips with Oxisol particles were incubated at 100% humidity. Dynamics of individual elements at the soils' BGIs were quantitatively determined using X-ray photoelectron spectroscopy (XPS). Distinct differences in the soil-microbe complexes and elemental dynamics between the Mollisol and Oxisol BGIs suggested that the formation of specific BGIs resulted from the complex interaction of physical, chemical, and microbial processes. By integrating the SoilChip and XPS, it was possible to elucidate the dynamic formation of the two different soil BGIs under standardized conditions. Therefore, the SoilChip method is a promising tool for investigating micro-ecological processes in soil. (C) 2017 Published by Elsevier Ltd.
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