Evaluation of heterogeneity of populations of Dactylis glomerata L. depending on biotope conditions

Dactylis glomerata L. occurs in various habitats, in communities of various types of vegetation (absolute and normal upland). However, the adaptive capabilities of the species under the conditions of technogenic load have not been studied enough. Studies have been carried out to study the structure of coenopopulations of the polycarpic loose sympodially branching grass Dactylis glomerata under the conditions of the Kaliningrad region in biotopes. These biotopes are part of biocenoses confined to roadside areas with a gradation of the degree of technogenic load. All habitats of the species are represented by four key areas experiencing varying degrees of air pollution (vehicle emissions). The relevance of the study was to determine the morphometric and phytocenotic parameters that characterize the stability of the object of study. Population heterogeneity was assessed in terms of morphometric parameters and age structure. The age structure of the coenopopulations of the species in the considered habitats is characterized by a high proportion of generative individuals with an insignificant participation of the virginal group, which is explained by increased competitive relations and weak seed renewal. A comprehensive assessment of the state of coenopopulations showed a variation in the projective cover, abundance, while maintaining the young and mature age groups, which, under different ecotopic conditions, made it possible to attribute it to populations of the normal type. Variation of morphometric parameters is observed under conditions of different biotopes. Coenopopulations in culture are in an optimal state, which corresponds to the coincidence of aut- and synecological optimums. During the growth of the species in communities confined to roadside areas, significant differences have been noted in the studied morphometric parameters (number of internodes, length of the leaf blade, height of vegetative and generative shoots and their number). 

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