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- W2110265554 abstract "Biogenic silica (BSi) precipitates in leaves and needles of trees and contributes to the amorphous silica fraction (ASi) in soil through litterfall. In forest ecosystem, the ubiquitous and significant ASi pool could influence the Si mass-balance at watershed scale, which plays a major in the global biogeochemical processes. Thus, an accurate quantification of the ASi pool in forest soils is a mandatory step. Here, we examined the distribution of the ASi in an acid brown soil under various tree species (Douglas fir, Black pine and European beech) established in identical soil and climate conditions. We quantified the ASi concentration in soil with alkaline extraction (Na 2CO 3 0.1M). The mean content of ASi in humus layer significantly decreases in the sequence (mg ASi / g): Douglas fir (14.5) > European beech (11.8) > Black pine (5.4). Tree species impacts the ASi pool in the humus layer through different uptakes of H 4SiO 4 0 and accumulation of BSi in leaves and needles. In mineral layers, pedogenic processes could hide tree species impact on ASi concentration, which decreases from the humus layer to 15 cm depth and then progressively increases from 15 to 75 cm depth under each three species. In soil, the distribution of the ASi content seems rather influenced by translocation-dissolution, pedogenic opal formation and ASi sorption onto Fe oxides. Our data imply that forest ecosystem type impacts the stock of BSi in a soil-tree system." @default.
- W2110265554 created "2016-06-24" @default.
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- W2110265554 date "2009-01-01" @default.
- W2110265554 modified "2023-10-18" @default.
- W2110265554 title "Impact of tree species on the distribution of amorphous silica in an acid brown soil" @default.
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