Abstract—Some factors influencing C and N contents in fine plant roots were studied in the Middle Urals. They included ecological (edaphic) features of habitats; type of root symbioses (the capability for symbiotic nitrogen fixation and formation of different mycorrhiza types); and ecological strategies of species. Samples of fine roots from woody and herbaceous plants and of the upper soil layer were collected in two industrial dump sites and in an area with natural communities. In each area, samples were taken from forest and meadow habitats. The content of C or N in the species from the sampling plot served as an observation unit. A total of 83 estimates were analyzed. As a result, differences were revealed between the key factors influencing the content of each element in fine roots: the C content is determined mainly by the type of mycorrhiza, while the determinant factor for the N content is the capability for symbiotic nitrogen fixation; ecological features of habitats and the type of plant ecological strategy are the second and third factors influencing the C and N contents. The patterns of N accumulation in the roots of plants with different ecological strategies and with different types of mycorrhizas do not fully replicate the patterns of N accumulation in their leaves.

摘要—在乌拉尔中部地区研究了一些影响细植物根中C和N含量的因素。其中包括栖息地的生态（前卫）特征；根共生的类型（共生固氮和形成不同菌根类型的能力）；和物种的生态策略。在两个工业垃圾场和一个自然群落地区收集了木本和草本植物的细根样品以及上层土壤层的样品。在每个地区，都从森林和草甸栖息地中采集样品。采样区中物种中C或N的含量用作观察单位。总共分析了83个估算值。结果表明，影响细根中各元素含量的关键因素之间存在差异：C含量主要由菌根的类型决定，而氮含量的决定因素是共生固氮能力。栖息地的生态特征和植物生态策略的类型是影响碳和氮含量的第二和第三因素。具有不同生态策略和不同菌根类型的植物根系中的氮素积累模式不能完全复制其叶片中的氮素积累模式。