G. R. Denisova, V. A. Cheremushkina, A. Yu. Astashenkov, E. B. Talovskaya
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Multi-Annual Structure of Cenopopulations of Dracocephalum peregrinum L. in the Steppe Communities of Siberia (Russia)
The interannual structure of four coenopopulations (CPs) of Dracocephalum peregrinum L. located in the steppe communities of Siberia is considered. A range of ontogenetic spectra has been established: left-sided, centered, and bimodal. During the period studied, the ontogenetic spectra of all CPs show an accumulation of individuals of the pregenerative period; the proportion of the generative fraction in the CPs of Tuva increases (CP2, CP3), and those of Gornyi Altai (CP1) and Khakassia (CP4) decrease. Changes in the structure of the spectra occur for various reasons: a decrease in anthropogenic load (CP1–CP4), an increase in the amount of precipitation (CP2, CP3), the growth of shrubs in the cenosis (CP3), and microconditions of the local area (CP4). Demographic and development rate indicators confirmed the rejuvenation and stability of the studied CPs.
期刊介绍：
Arid Ecosystems publishes original scientific research articles on desert and semidesert ecosystems and environment:systematic studies of arid territories: climate changes, water supply of territories, soils as ecological factors of ecosystems state and dynamics in different scales (from local to global);systematic studies of arid ecosystems: composition and structure, diversity, ecology; paleohistory; dynamics under anthropogenic and natural factors impact, including climate changes; studying of bioresources and biodiversity, and development of the mapping methods;arid ecosystems protection: development of the theory and methods of degradation prevention and monitoring; desert ecosystems rehabilitation;problems of desertification: theoretical and practical issues of modern aridization processes under anthropogenic impact and global climate changes.
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