Populations of Agrostis diluta Kurcz. and Psathyrostachys caespitosa (Sukaczev) Peschkova in Yakutia: dynamics of vitality

Acta Biologica Sibirica

article

Vilyura E. Kardashevskaya¹  Nyurguyana N. Egorova² 

[1] North-Eastern Federal University;Institute for Biological Problems of Criolithozone

关键词: Plant population;    population dynamics;    vitality;    quality index;   

DOI  :  10.3897/abs.7.e78452

学科分类：外科医学

来源: Pensoft

【 摘 要 】

In Yakutia, natural floodplain meadows and steppes have long been involved in economic activities.To develop methods of rational use, one needs to constantly consider the state of vegetation, mainly itsconstituent populations. Our research focuses on studying the dynamics of the vitality of the populations of the Agrostis diluta Kurcz. and steppe Psathyrostachys caespitosa (Sukaczev) Peschkova cereals.These species play an essential role in the composition of vegetation cover. We determined the vitalitycoefficient IVC. Our study of populations over several years has revealed the dynamic mobility ofthe vital structure, which is of adaptive significance and ensures the sustainability of populations. Wehave found that the vital structure of the cereal populations of the meadow Agrostis diluta and thesteppe Psathyrostachys caespitosa during long-term studies (2007–2013 and 2007–2016, respectively)is heterogeneous. In unfavorable humidification conditions, we characterize years as depressive. Under favorable conditions of humidification, they quickly turn into thriving plants. In addition to theweather of the vegetation periods, habitat specificity affects the vitality of species populations that differ in ecological and coenotic characteristics. The Q quality index and IVC correspond to each otherby year and form a clear descending order during the transition from a thriving to a depressive state.Currently, the vital state of the populations of both species is satisfactory.

【 授权许可】

CC BY