Mg isotope composition in beech forest ecosystems and variations induced by liming: insights from four experimental sites in Northern France

Many forest soils are acidic and have very low plant-available pools of magnesium. Past present sylvicultural, nutritional and/or climatic pressures endured by ecosystems can result in net losses nutrients ecosystem function losses. Liming with a carbonate product is an alternative to counteract these degradations but the effects liming on biogeochemical cycling over time dynamics Mg released from products still unclear. We studied isotopes composition four paired-treatment experimental beech northern France. At sites where dolomitic lime was applied, variation exchangeable foliar ?26Mg demonstrated direct contribution dolomite-derived replenishment topsoil tree nutrition improvement: incorporated into biological which allows its retention mid long term soil–plant system. limed calcium carbonate, changes contents observed suggest that applied contained small amount changed after liming, cope particular availability. Lastly, our results highlight high organic layer (humus): fractionation processes occurring within this (mineralization/ageing matter, preferential 26 Mg) could explain singular signatures greatly influence pools.