Dynamics of stand basal areas and stocks in pine plantations of different initial density
https://doi.org/10.21266/2079-4304.2023.243.120-135
Abstract
The history of the study of growth and productivity of stands is characterized by the constant development of new models that improve and complement the previous ones. The purpose of the study is to develop empirical models of the dynamics of the basal areas and stocks of pine plantations of different initial density based on the materials of long-term observations on permanent sample plots. The object of the study was pine cultures on permanent trial plots of the Forest Experimental Station of the Russian State Agrarian University – Moscow Timiryazev Agricultural Academy. To modeling the dynamics of the basal areas and stocks, an additive model was used based on the Weibull probability density function, the parameters of which are expressed linearly from the initial density. The dynamics of stand indicators in each forest stand is individual, and it is influenced by many internal and external factors. Due to the heterogeneity of the action in space and time of environmental factors in the dynamics of stand indicators, deviations from monotonous curves appear, which indicate the presence of self-regulation mechanisms in populations of woody plants with the passage of forest stands through several stages from a stable to an unstable state. The tables of the course of growth do not reflect the dynamics of stand indicators of actual forest stands and cannot be used for its forecasting. It is impossible to present in tabular form the whole variety of trajectories of stand dynamics that are possible in nature. The tables of the course of growth of normal stands contain information on the limiting values of the basal areas and stocks, but plantings cannot be in such an unstable state in nature for a long time. The life cycle of a forest stand is a wave-like process of the dynamics of stand indicators, due to different intensity of the impact of both internal (manifestation of self-regulation in tree communities and feedback loops) and external factors. To model the nonmonotonic dynamics of forest stand indicators, it is possible to use models obtained by summing several simple growth functions or nonmonotonic ones with one maximum point.
About the Authors
N. N. Dubenok
Agricultural Reclamation, Forestry and Land Management at Russian State Agrarian University – Moscow Timiryazev Agricultural Academy
Russian Federation
Russian Federation
DUBENOK Nikolay N. – DSс (Agriculture), professor, academician of RAS, head of the department
127434. Timiryazevskaya str. 49. Moscow
A. V. Lebedev
Forestry and Land Management at Russian State Agrarian University – Moscow Timiryazev Agricultural Academy
Russian Federation
Russian Federation
LEBEDEV Aleksandr V. – PhD (Agriculture), associate professor of the department of Agricultural Reclamation
127434. Timiryazevskaya str. 49. Moscow
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Review
For citations:
Dubenok N.N., Lebedev A.V. Dynamics of stand basal areas and stocks in pine plantations of different initial density. Izvestia Sankt-Peterburgskoj lesotehniceskoj akademii. 2023;(243):120-135. (In Russ.) https://doi.org/10.21266/2079-4304.2023.243.120-135
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