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Litter leachates have stronger impact than leaf litter on Folsomia candida fitness
Soil Biology and Biochemistry ( IF 9.7 ) Pub Date : 2020-05-10 , DOI: 10.1016/j.soilbio.2020.107850
Mathilde Chomel , Virginie Baldy , Marie Guittonny , Stephane Greff , Annie DesRochers

It is well known that soil physico-chemical conditions and the nature of organic matter have important effects on soil micro-arthropod communities, including collembolans. However, mechanisms by which the physical or chemical quality of litter influence collembolan communities remain unclear. Plant secondary metabolites are partially released in soils through leaf and litter leaching and decomposition, and can have a strong influence on soil communities and their activity. In order to disentangle effects of the water-soluble compounds contained in the litter versus its physical effect, a microcosm experiment was set up exposing the collembola species Folsomia candida to either litter or litter leachates mixed to the substratum. Litter from three species with different chemical properties and one mixture (hybrid poplar, white spruce, grass and a mixture of poplar – spruce litter) and two concentrations of litter leachates (at 5% and 10% concentration) were used in microcosm experiments. After 30 days of incubation, reproduction and mortality rates of F. candida were assessed. Results showed that the tree litter leachates had a stronger impact on collembolan fitness compared to the litter itself, with a net reduction of survival and reproduction rates. Between 78 and 100% of mortality was observed in microcosms that received tree leachates, indicating a strong influence of the soluble compounds contained in tree leaves on collembolan. In contrast, collembolan reproduction was positively affected by the grass litter or 10% grass litter leachates compared to control (water). Our findings help to understand how chemical properties and leaf leaching may have important impacts on micro-arthropods communities and litter decomposition processes.



中文翻译:

垃圾渗滤液对叶子念珠菌适应性的影响比叶子凋落物强

众所周知,土壤的物理化学条件和有机物的性质对包括collembolans在内的土壤微节肢动物群落具有重要影响。但是,垫料的物理或化学质量影响collembolan群落的机制仍不清楚。植物次生代谢产物通过叶和凋落物的淋溶和分解而部分释放到土壤中,并且可能对土壤群落及其活性产生强烈影响。为了弄清楚垃圾中所含水溶性化合物的作用与其物理作用,建立了一个微观实验,暴露了念珠菌念珠菌或将垃圾或垃圾渗滤液混合到基质中。在微观世界实验中,使用了来自三种具有不同化学特性的物种和一种混合物(杂种杨树,白云杉,草和杨树–云杉凋落物的混合物)和两种浓度的凋落物沥出液(浓度分别为5%和10%)的凋落物。孵育30天后,念珠菌的繁殖和死亡率被评估。结果表明,与凋落物本身相比,树木凋落物渗滤液对collembolan的适应性有更强的影响,其存活率和繁殖率净降低。在接受树浸液的微观世界中观察到了78%至100%的死亡率,这表明树叶中所含的可溶性化合物对collembolan的强烈影响。相比之下,与对照(水)相比,草屑或10%的草屑渗滤液会对collembolan繁殖产生积极影响。我们的发现有助于了解化学特性和叶片浸出如何对微型节肢动物群落和凋落物分解过程产生重要影响。

更新日期:2020-05-10
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