Fire enhances solubility of biogenic silica

The Science of the Total Environment
Dácil Unzué-BelmonteJörg Schaller

Abstract

Changing fire regimes in response to climate change are likely to have significant effects on terrestrial ecosystems and biogeochemical cycles. While effects of fire on some nutrient cycles have been quite well-studied, little attention has been paid to the silicon cycle. We used an alkaline continuous extraction to examine changes in the quantity and characteristics of alkaline extractable Si (AlkExSi) after applying two burning treatments (no heating, 350°C and 550°C) to three types of organic soil material (from spruce forest, beech forest and a commercial peat). The total AlkExSi measured was 25.1±2.1mgg-1and 15.4±0.9mgg-1for spruce and beech respectively, and 1.2±0.5mgg-1for peat. The alkaline extraction parameters confirm a purely biogenic AlkExSi source in untreated spruce and beech organic soil material samples. Organic soil material of beech forest had two biogenic silica pools, differing in reactivity during alkaline extraction. Burning severely alters the alkaline dissolution parameters suggesting a significant crystallization of biogenic Si (BSi) with increased burning severity. Additionally, dissolution experiments carried out in rain water showed that fire increased the solubility of BSi by a factor of 40 and 20 i...Continue Reading

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Citations

Jul 3, 2016·The Science of the Total Environment·Paulo PereiraDeborah Martin
Nov 12, 2016·The Science of the Total Environment·Paulo PereiraJessica Miesel
Nov 20, 2018·Scientific Reports·Jörg SchallerBritta Planer-Friedrich
Feb 10, 2021·Plants·Jörg SchallerMichael Sommer
Jun 1, 2019·The Science of the Total Environment·Timothy J Maguire, Robinson W Fulweiler

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