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• W2035710056 abstract "Forest soils contain a variable amount of organic N roughly repartitioned among particles of different size, microbial biomass and associated with mineral compounds. All pools are alimented by annual litter fall as main input of organic N to the forest floor. Litter N is further subject to mineralization/stabilization recognized as the crucial process for the turnover of litter N. Although it is well documented that different soil types have different soil N stocks, it is presently unknown how different soil types affect the turnover of recent litter N. Here, we compared the potential mineralization of the total soil organic N with that of recent litter-released N in three beech forests varying in their soil properties. Highly 15N-labelled beech litter was applied to stands located at Aubure, Ebrach, Collelongo, which differ in humus type, soil type and soil chemistry. After 4–5 years of litter decomposition, the upper 3 cm of the organo-mineral A horizon was sampled and the net N mineralization was measured over 112 days under controlled conditions. The origin of mineralized N (litter N versus soil organic N) was calculated using 15N labeling. In addition, soils were fractionated according to their particle size (>2000 μm, 200–2000 μm, 50–200 μm, <50 μm) and particulate organic matter (POM) was separated from the mineral fraction in size classes, except the <50 μm fraction. Between 41 and 69% of soil organic N was recovered as POM. Litter-released 15N was mainly to be found in the coarse POM fractions >200 μm. On a soil mass basis, N mineralization was two-fold higher at Aubure and Collelongo than at Ebrach, but, on a soil N basis, N mineralization was the lowest at Collelongo and the highest at Ebrach. On a soil N (or 15N) basis, mineralization of litter 15N was two to four-fold higher than mineralization of the average soil N. Furthermore, the δ15N of the mineral N produced was closer to that of POM than to that of the mineral-bound fraction (<50 μm). Highest rates of 15N mineralization happened in the soil with the lowest N content, and we found a negative relationship between accumulations of N in the upper A horizon and the mineralization of 15N from the litter. Our results show that mineral N is preferentially mineralized from POM in the upper organo-mineral soil irrespective of the soil chemistry and that the turnover rate of litter N is faster in soils with a low N content." @default.
• W2035710056 created "2016-06-24" @default.
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• W2035710056 date "2011-03-01" @default.
• W2035710056 modified "2023-10-11" @default.
• W2035710056 title "Coarse particulate organic matter is the primary source of mineral N in the topsoil of three beech forests" @default.
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• W2035710056 doi "https://doi.org/10.1016/j.soilbio.2010.11.019" @default.
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