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Agricultural silica harvest: have humans created a new loop in the global silica cycle?
Author(s) -
Vandevenne Floor,
Struyf Eric,
Clymans Wim,
Meire Patrick
Publication year - 2012
Publication title -
frontiers in ecology and the environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.918
H-Index - 164
eISSN - 1540-9309
pISSN - 1540-9295
DOI - 10.1890/110046
Subject(s) - biogeochemical cycle , cycling , agriculture , environmental science , climax community , biogenic silica , soil water , ecosystem , biogeochemistry , terrestrial ecosystem , agroecosystem , plant litter , agroforestry , agronomy , ecology , ecological succession , geography , biology , soil science , forestry , diatom
Silica (Si) is of great concern to agronomists because it has a beneficial effect on plant resistance to various stresses, enabling yield optimization in economically important crop species. Yet biogenic silica (BSi) cycling in soils controls a large part of the Si export fluxes to rivers and oceans. Despite the importance of agricultural‐harvest‐related Si removal, previous studies have not addressed this topic thoroughly. By performing a detailed quantification of agricultural Si export in Western Europe's Scheldt River basin, we show that harvest not only disrupts BSi cycling but also introduces an agricultural Si pathway, with major export Si fluxes as compared with BSi production in climax forest communities and grasslands. Harvesting substantially changes terrestrial Si cycling because reconstitution of BSi to soils in litter fall is prevented. The agricultural Si loop clearly constitutes an important flow of BSi out of terrestrial ecosystems – one that is currently unrecognized in global biogeochemical Si cycling.