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• W2081388530 abstract "Abstract The fate of immobilized N in soils is one of the great uncertainties in predicting C sequestration at increased CO 2 and N deposition. In a dual isotope tracer experiment ( 13 C, 15 N) within a 4‐year CO 2 enrichment (+200 ppm v ) study with forest model ecosystems, we (i) quantified the effects of elevated CO 2 on the partitioning of N; (ii) traced immobilized N into physically separated pools of soil organic matter (SOM) with turnover rates known from their 13 C signals; and (iii) estimated the remobilization and thus, the bio‐availability of newly sequestered C and N. (1) CO 2 enrichment significantly decreased NO 3 − concentrations in soil waters and export from 1.5 m deep lysimeters by 30–80%. Consequently, elevated CO 2 increased the overall retention of N in the model ecosystems. (2) About 60–80% of added 15 NH 4 15 NO 3 were retained in soils. The clay fraction was the greatest sink for the immobilized 15 N sequestering 50–60% of the total new soil N. SOM associated with clay contained only 25% of the total new soil C pool and had small C/N ratios (<13), indicating that it consists of humified organic matter with a relatively slow turn over rate. This implies that added 15 N was mainly immobilized in stable mineral‐bound SOM pools. (3) Incubation of soils for 1 year showed that the remobilization of newly sequestered N was three to nine times smaller than that of newly sequestered C. Thus, inorganic inputs of N were stabilized more effectively in soils than C. Significantly less newly sequestered N was remobilized from soils previously exposed to elevated CO 2 . In summary, our results show firstly that a large fraction of inorganic N inputs becomes effectively immobilized in relative stable SOM pools and secondly that elevated CO 2 can increase N retention in soils and hence it may tighten N cycling and diminish the risk of nitrate leaching to groundwater." @default.
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• W2081388530 date "2005-09-19" @default.
• W2081388530 modified "2023-10-14" @default.
• W2081388530 title "Immobilization, stabilization and remobilization of nitrogen in forest soils at elevated CO₂: a ¹⁵N and ¹³C tracer study" @default.
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• W2081388530 doi "https://doi.org/10.1111/j.1365-2486.2005.01041.x" @default.
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