Preferential use of root litter compared to leaf litter by beech seedlings and soil microorganisms
Preferential use of root litter compared to leaf litter by beech seedlings and soil microorganisms
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DOI：
10.1007/s11104-012-1521-z
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发表时间：
2013-07-01
期刊：
影响因子：
4.9
通讯作者：
Simon, Judy
中科院分区：
文献类型：
--
作者：
Guo, Chanjuan;Dannenmann, Michael;Simon, Judy
背景与目的凋落物分解受e. G.基质质量和环境因素，特别是水的可利用性。因此，凋落物释放的养分在植被和土壤微生物之间的分配可能会受到气候变化的影响。本研究旨在阐明凋落物类型和干旱的命运的凋落物衍生的N在山毛榉幼苗和土壤microbiots.Methods的影响，我们量化的N-15回收率在植物和土壤N池添加N-15-标记的叶和/或根凋落物在controlledconditions.Results根凋落物有利于比叶凋落物的N收购山毛榉幼苗和土壤微生物。干旱减少N-15恢复从凋落物中的幼苗，从而影响根系N营养。N-15积累在幼苗在不同的水槽取决于凋落物type.Conclusions根周转出现的影响（a）N在土壤中的植物和土壤微生物的有效性和（B）N的收购和保留，尽管推测非常动态的微生物生物量的营业额。与土壤微生物相比，山毛榉幼苗代表了一个非常小的短期N库，尽管潜在的高N停留时间。此外，土壤微生物构成了一个重要的氮库，可以长期释放，因此，可能成为植物的氮营养。
Background and aims Litter decomposition is regulated by e. g. substrate quality and environmental factors, particularly water availability. The partitioning of nutrients released from litter between vegetation and soil microorganisms may, therefore, be affected by changing climate. This study aimed to elucidate the impact of litter type and drought on the fate of litter-derived N in beech seedlings and soil microbes.Methods We quantified N-15 recovery rates in plant and soil N pools by adding N-15-labelled leaf and/or root litter under controlled conditions.Results Root litter was favoured over leaf litter for N acquisition by beech seedlings and soil microorganisms. Drought reduced N-15 recovery from litter in seedlings thereby affecting root N nutrition. N-15 accumulated in seedlings in different sinks depending on litter type.Conclusions Root turnover appears to influence (a) N availability in the soil for plants and soil microbes and (b) N acquisition and retention despite a presumably extremely dynamic turnover of microbial biomass. Compared to soil microorganisms, beech seedlings represent a very minor short-term N sink, despite a potentially high N residence time. Furthermore, soil microbes constitute a significant N pool that can be released in the long term and, thus, may become available for N nutrition of plants.