Rice field soils of differing pH from Jiangsu Province, China, were incubated with lanthanum chloride to test effects on methane-oxidizing microbial communities. Added lanthanum inhibited methane consumption to a degree that depended on soil origin and pH, and the communities shifted while keeping function over time.
Key numbers
- Background lanthanum in the three rice field soils: 46.93, 47.37 and 32.78 mg/kg dry soil (acidic, neutral and alkaline soils) (Table 1, p. 3).
- Added lanthanum chloride treatment solutions: 300, 600 and 1200 mg/L, plus a no-addition control; 36 microcosms (Methods, p. 2).
Methods (brief)
Topsoil (0 to 20 cm) from Yangzhou, Xuzhou and Yancheng was incubated in diluted mineral medium with lanthanum chloride in the dark for four weeks; methane uptake by gas chromatography, community composition by 16S rRNA gene sequencing and qPCR; lanthanum measured by a contract laboratory.
Evidence fitness
Supports statements that added lanthanum can alter soil methane-oxidizing bacteria and gives background paddy soil lanthanum values for three Chinese sites. It concerns soil microbes, not the human gut, and does not address crop uptake.
Limitations
Laboratory microcosms at high lanthanum additions; three soils; analytical quality control for lanthanum not described.
Related evidence
Update history
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