Root-derived carbon and nitrogen from beech and ash trees differentially fuel soil animal food webs of deciduous forests.
Root-derived carbon and nitrogen from beech and ash trees differentially fuel soil animal food webs of deciduous forests.
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DOI：
10.1371/journal.pone.0189502
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Scheu S
中科院分区：
文献类型：
--
作者：
Zieger SL;Ammerschubert S;Polle A;Scheu S
越来越多的证据表明，土壤动物食物网是由根源碳(C)和根源氮(N)提供燃料的。作为连接地上与地下系统的纽带，树木及其物种特性是构建土壤动物群落的重要驱动力。利用15N和13C进行脉冲标记实验，将山毛榉（Fagus sylvatica）和白蜡（Fraxinus excelsior）幼苗在可控条件下暴露于13CO2富集的大气中，将树叶暴露于15N的氯铵溶液中72 h。C和N通量进入山毛榉土壤动物食物网，与外生菌根真菌（EMF）有关，灰，与丛枝菌根真菌（AMF）有关。在两个采样日期（标记后5天和20天）进行调查。所有土壤动物类群均含有根源性碳，而根源性氮仅在某些类群中存在。树种特性对碳氮运移有强烈影响，且山毛榉根际的碳氮运移明显超过白灰根际。在标记后5至20天内，碳和氮的掺入差异不大，这表明碳和氮都能迅速被土壤动物吸收并用于组织形成。研究结果表明，土壤食物网中的能量和养分通量取决于树种的特性，其差异与不同类型的菌根有关。需要进一步的研究来证明这些发现的普遍性，并量化植物C和N进入森林和其他陆地生态系统土壤食物网的通量。
Evidence is increasing that soil animal food webs are fueled by root-derived carbon (C) and also by root-derived nitrogen (N). Functioning as link between the above- and belowground system, trees and their species identity are important drivers structuring soil animal communities. A pulse labeling experiment using 15N and 13C was conducted by exposing beech (Fagus sylvatica) and ash (Fraxinus excelsior) seedlings to 13CO2 enriched atmosphere and tree leaves to 15N ammonium chloride solution in a plant growth chamber under controlled conditions for 72 h. C and N fluxes into the soil animal food web of beech, associated with ectomycorrhizal fungi (EMF), and ash, associated with arbuscular mycorrhizal fungi (AMF), were investigated at two sampling dates (5 and 20 days after labeling). All of the soil animal taxa studied incorporated root-derived C, while root-derived N was only incorporated into certain taxa. Tree species identity strongly affected C and N incorporation with the incorporation in the beech rhizosphere generally exceeding that in the ash rhizosphere. Incorporation differed little between 5 and 20 days after labeling indicating that both C and N are incorporated quickly into soil animals and are used for tissue formation. Our results suggest that energy and nutrient fluxes in soil food webs depend on the identity of tree species with the differences being associated with different types of mycorrhiza. Further research is needed to prove the generality of these findings and to quantify the flux of plant C and N into soil food webs of forests and other terrestrial ecosystems.
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影响因子：
2
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