The relative importance of belowground and aboveground energy inputs for the decomposer communities in soil remains largely unknown. In particular, no research has been done on the significance of root-derived resources for nematode communities in boreal forests. In two spruce stands in the taiga zone, we set up a field experiment in which girdling of spruce trees and clipping of dwarf shrubs was performed. Root-derived resources were hypothesized to be highly important; accordingly, we expected to observe a suppression of the nematode community after experimental manipulations. To obtain information on the nature of changes in the soil food web, nematode community structure indices were applied. In partial confirmation of our hypothesis, spruce girdling decreased mycorrhizal hyphae biomass as assessed via in-growth mesh bags, as well as the abundance of fungivorous nematodes, mostly of the Aphelenchoides and Filenchus genera. The enrichment index (EI) value decreased, indicating reduction of organic matter inputs into the soil food web, whereas nematode channel ratio (NCR) index value increased, indicating a shift towards domination of the bacterial energy channel. Total nematode abundance, genera richness, and abundance of herbivores, omnivores, and predators did not change in response to spruce girdling. Clipping of dwarf shrubs decreased fungal and bacterial PLFA biomarkers, but did not affect nematode communities. Thus, the resources channeled in soil by the roots of canopy trees are of different relative importance for nematodes having different trophic habits. Fungivorous nematodes are at least partly dependent on root-derived resources, suggesting feeding on ectomycorrhizal mycelium. Rhizodeposits of understory vegetation are likely of low importance for nematodes.

地下能源和地下能源输入对土壤中分解者群落的相对重要性仍然未知。尤其是，尚未研究根源资源对北方森林线虫群落的重要性。在针叶林带的两个云杉林中，我们进行了田间试验，对云杉树木进行环剥和矮化灌木修剪。根源资源被认为是非常重要的。因此，我们期望在实验操作后观察到线虫群落受到抑制。为了获得有关土壤食物网变化性质的信息，应用了线虫群落结构指标。为了部分证实我们的假设，云杉环带减少了菌根菌丝的生物量，方法是通过生长网袋进行评估，线虫和Filenchus属。富集指数（EI）值降低，表明有机物质输入土壤食物网的数量减少，而线虫通道比（NCR）指数值升高，表明细菌能量通道已占主导地位。总的线虫丰度，属丰富度和草食动物，杂食动物和捕食者的丰度并未因云杉剥落而改变。修剪矮灌木减少了真菌和细菌PLFA生物标志物，但没有影响线虫群落。因此，对于具有不同营养习性的线虫，通过冠层树根在土壤中输送的资源具有不同的相对重要性。真菌性线虫至少部分地依赖于根源的资源，表明以外生菌根菌丝体为食。