Abstract

This paper presents the results of study of the structure of a soil nematode community from key sites (index plots) on Vodnyi Island of the State Biosphere Reserve Rostovskii in the spring. A total of 76 genera from 41 families and nine orders were identified with 39 species common for 2 months (April–May). A number of characteristics of soil nematode fauna in spring were shown to manifest themselves in the genus diversity, occurrence frequency, and dominance of particular ecological–trophic groups and genera. The total number of species on index plots varied between 17 and 33; with the number of nematodes ranging from 230 to 994 individuals per 100 cm³ of soil in April and from 134 to 1043 individuals per 100 cm³ of soil in May. The order Dorylaimida, which included 29 genera, proved to be the most diverse by the genus composition followed by Tylenchida with 19 and Rhabditida with 11 genera. An increase in the number of nematodes from phytotrophic group in the spring was directly related to an increase in the fresh aboveground phytomass, as confirmed by correlation analysis (the coefficient of correlation has very high values: r_April = 0.86, r_May = 0.96 at p-level < 0.05).

中文翻译：

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沃德尼岛（Rostovskii国家生物圈保护区）干旱草原植物群落春季土壤线虫群落结构

摘要

本文介绍了罗斯托夫斯基国家生物圈保护区沃德尼岛关键点（指标地块）春季土壤线虫群落结构的研究结果。2个月（4月至5月）共鉴定出41科9目76属39种常见物种。春季土壤线虫动物群的许多特征表现在属的多样性、出现频率以及特定生态营养类群和属的优势度上。指数图上的物种总数在 17 到 33 之间变化；4月份，线虫数量为每100 cm ³土壤230至994个个体，每100 cm 3 土壤线虫数量为134至1043个^个体五月的土壤。从属组成来看，Dorylaimida 目包括 29 个属，是最多样化的，其次是 Tylenchida 目（19 个属）和Rhabditida 目（11 个属）。相关分析证实，春季植物营养组线虫数量的增加与新鲜地上植物量的增加直接相关（相关系数具有非常高的值：r April = 0.86 ，_r May = _0.96，p水平 < 0.05)。