Abstract

Two key sites representing virgin and pasture biotopes were studied. Their soil parameters were identified, brief descriptions of the vegetation were given, and the spectral–reflective characteristics of the vegetation cover (normalized difference vegetation index, NDVI) were calculated based on Landsat 8 OLI satellite imagery. The seasonal dynamics of the structure of soil nematode communities in chestnut solonetzic soils affected by grazing pressure was examined. A number of characteristic features manifested in the species diversity of the nematode fauna, changes in their total abundance, and the predominance of certain trophic groups and genera have been identified. In total, 133 taxa were registered on the key sites; 58 species have been identified. It is established that the specific features of the soil nematode communities in various seasons of the year are manifested by the predominance of certain trophic groups and genera, as well as their total abundance on the key sites. Overall, the nematode fauna is quite diverse: the Shannon index varies throughout the year within the same range of values. The Bongers maturity index (MI) for the nematode fauna indicates that their habitat conditions are stable.

中文翻译：

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牧草河谷放牧压力对板栗土壤线虫群落结构的季节性影响

摘要

研究了代表原始生物和牧场生物群落的两个关键部位。确定了它们的土壤参数，简要描述了植被，并根据Landsat 8 OLI卫星图像计算了植被覆盖的光谱反射特性（归一化植被指数，NDVI）。考察了放牧压力对板栗孤松土壤土壤线虫群落结构的季节动态。线虫动物的物种多样性，其总丰度的变化以及某些营养类和属的优势已表现出许多特征。关键地点共登记了133个分类单元。已经鉴定出58种。已经确定，一年中各个季节的土壤线虫群落的特定特征通过某些营养类群和属的优势以及在关键地点的总丰度得以体现。总体而言，线虫的动物种类繁多：香农指数全年在相同值范围内变化。线虫动物的邦格斯成熟度指数（MI）表明其栖息地条件稳定。