Minor contribution of leaf litter to N nutrition of beech (Fagus sylvatica) seedlings in a mountainous beech forest of Southern Germany
Minor contribution of leaf litter to N nutrition of beech (Fagus sylvatica) seedlings in a mountainous beech forest of Southern Germany
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DOI：
10.1007/s11104-013-1603-6
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发表时间：
2013-08-01
期刊：
影响因子：
4.9
通讯作者：
Dannenmann, Michael
中科院分区：
文献类型：
--
作者：
Guo, Chanjuan;Simon, Judy;Dannenmann, Michael
在德国南部的温带山毛榉林中，用N-15标记凋落叶，在3个生长季节内，在矿质土壤中的非生物和生物氮库中，以及在山毛榉幼苗和菌根根尖中，对凋落叶中的氮进行了原位示踪，研究了凋落叶中氮在植物-土壤-微生物系统中的去向及其对山毛榉幼苗氮素营养的重要性。结果表明，氮素在植物-土壤-微生物系统中的转移是迅速的，在植物-土壤-微生物系统中，凋落叶中的氮素在植物-土壤-微生物系统中的转移是迅速的，在植物-土壤-微生物系统中，凋落叶中的氮素在植物-土壤-微生物系统中的转移是迅速的，在植物-土壤-微生物系统中，凋落叶中的氮素在植物-土壤-微生物系统中的转移是迅速的。15到矿质土壤已经21天后，示踪剂的应用与土壤微生物生物量最初代表占主导地位的凋落物-N库。然而，N-15恢复在不可提取的土壤氮库强烈增加，随着时间的推移，随后成为占主导地位的N-15汇。876天后，植物生物量的恢复仅占N-15过量的0.025%。3个生长季后，N-15的过量回收率表现为：土壤非提取态N >>土壤微生物量提取态N>>植物生物量>外生菌根根尖。非常低的N-15恢复山毛榉幼苗表明其他N源，如根凋落物的山毛榉林下的N营养的重要性。
Our aims were to characterize the fate of leaf-litter-derived nitrogen in the plant-soil-microbe system of a temperate beech forest of Southern Germany and to identify its importance for N nutrition of beech seedlings.N-15-labelled leaf litter was traced in situ into abiotic and biotic N pools in mineral soil as well as into beech seedlings and mycorrhizal root tips over three growing seasons.There was a rapid transfer of N-15 into the mineral soil already 21 days after tracer application with soil microbial biomass initially representing the dominant litter-N sink. However, N-15 recovery in non-extractable soil N pools strongly increased over time and subsequently became the dominant N-15 sink. Recovery in plant biomass accounted for only 0.025 % of N-15 excess after 876 days. After three growing seasons, N-15 excess recovery was characterized by the following sequence: non-extractable soil N >> extractable soil N including microbial biomass >> plant biomass > ectomycorrhizal root tips.After quick vertical dislocation and cycling through microbial N pools, there was a rapid stabilization of leaf-litter-derived N in non-extractable N pools of the mineral soil. Very low N-15 recovery in beech seedlings suggests a high importance of other N sources such as root litter for N nutrition of beech understorey.