MODELING THE DYNAMICS OF FOREST ECOSYSTEMS TAKING INTO ACCOUNT THEIR STRUCTURAL HETEROGENEITY AT DIFFERENT FUNCTIONAL AND SPATIAL LEVELS

V. N. Shanin^{1, 2}, P. V. Frolov¹, I. V. Priputina¹, O. G. Chertov³, S. S. Bykhovets¹, E. V. Zubkova¹, A. M. Portnov¹, G. G. Frolova¹, M. N. Stamenov¹, P. Y. Grabarnik¹

¹Institute of Physicochemical and Biological Problems in Soil Science

Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences, Institutskaya 2, 142290 Pushchino, Russia

²Center for Forest Ecology and Productivity of the Russian Academy of Sciences

Profsoyuznaya st., 84/32, bld. 14, 117997 Moscow, Russia

³Bingen University of Applied Sciences

Berlin Str. 109, 55411 Bingen, Germany

 

E‑mail: shaninvn@gmail.com

Received: 08.09.2022

Revised: 15.10.2022

Accepted: 28.10.2022

In many problems of modern forest ecology, it is necessary to analyze the conjugated dynamics of processes occurring at different spatio-temporal scales of the functioning of plant communities and soils resulted from their interaction under the influence of all edaphic and anthropogenic factors. Mathematical models can be an efficient tool for such analysis. The aim of this study is to present the implementation of a new system of models that makes it possible to reproduce in simulation experiments the spatial structure of forest phytocenoses formed by tree and grass-shrub layers, as well as associated heterogeneity of soil conditions and the diversity of ecological niches at different hierarchical levels. To determine the required level of detail of the spatial heterogeneity of forest biogeocenoses related to the processes of their multi-scale functioning, experimental studies were carried out on permanent sampling plots in the Prioksko-Terrasny State Natural Biosphere Reserve and in the “Kaluzhskie Zaseki” State Nature Reserve. The spatial structure of communities and related heterogeneity of ecological conditions were studied using traditional soil and geobotanical, as well as modern instrumental methods. The obtained data were used to construct the algorithms and to estimate the parameters of different blocks of the new system of models. The implementation of a spatially-explicit process-based system of models has shown its ability to reproduce the dynamics of forest ecosystems, taking into account the species composition and spatial structure of different layers of vegetation and the associated patchiness of soil conditions. Because of a wide range of interrelated ecosystem characteristics implemented in the system of models it is possible to simulate productivity, biological turnover of C and N, and the dynamics of forest ecosystems, taking into account their characteristic spatial structure at different scales. This makes it possible to improve the understanding of ecosystem processes and their contribution to maintaining the sustainable functioning of forests, which can be used for predictive assessments of the efficiency of forest management techniques and in solving other forestry and environmental problems.

Key words: simulation models, spatial structure, tree stand productivity, ground layer vegetation, forest soils, soil nutrients, carbon cycle

 

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