Dynamic characteristics of changes in the diameter of larch forests in the Lower Angara region are being analyzed. Larch stands of the herbal group of fox types is the object of the present research. This research is based on the data of field inventory 858 forest areas with larch predominance. The structure of the forest average diameter is approximated by the exponential function, statistical analysis of which has been carried out using a non-linear least-squares method and simulation methods by conducting 50000 statistical tests. Regularities of error distribution, parameters and calculation accuracy of approximating function have been defined. Estimations of parameter correlations approximating function have been suggested. Holetsky’s method helped to receive two dimensional parameter generator. The defined regularities of the dynamics of average diameters allow to design economic activities in forest stands of larch herbal groups types in the region under study.

At present, a significant area of Siberian dark coniferous forests is characterized by a significant decrease in resistance due to recurrent forest fires, mass reproduction of insect pests and diseases, which leads to their natural degradation and death. However, the intensity of the growth processes of the coniferous stand under certain forest conditions persists in the long term. Therefore, the creation of regression models of the course of forest growth with the identification of forest conditions is very important both from the point of view of practice and environmental monitoring. The object of the study was the stands of Siberian fir (Abies sibirica Ledeb) and Siberian spruce (Picea obovate Ledeb) of bonitet classes III-IV, growing in the conditions of the West Siberian southern taiga plain forest region on the territory of the Yenisei forestry of the Krasnoyarsk Territory. The initial data for studying the processes of natural growth of fir and spruce plantations were the materials of the mass inventory of 11097 units. As a result of the work carried out for modal fir-spruce stands, concentrated in the territory of Central Siberia (Yenisei forestry of the Krasnoyarsk Territory), regression models of the growth course have been developed, which make it possible to predict the dynamics of taxation indicators and reproduce the succession picture of the development of stands.

The research focuses on pinetum in the South of Central Siberia. Studying was performed in the territory of low-mountain suburban forests. Sample plots were set up in the sites where wood fires of different strength happened; the pinetum plantations withstanding to burning were in the observational focus. It was found that post-fire condition of trees depends on the tree size and plant population. The fire damage to trees (scorch height) depends on a tree size and the distance from the nearest exemplar.

The organization of forest management in intact forest landscapes (IFL) is currently an acute and insufficiently methodologically provided problem, which causes numerous discussions and disputes. Siberia is a wide area and heterogeneous in terms of the disturbance of the territory. The use of natural resources on such vast area has its own specifics, which must be taken into account. Intensive forest management, which covers a significant part of boreal forests, leads to a decrease in biodiversity. Evaluation of the structural, component and functional diversity of forest areas showed that not always one source gives complete information (for example, the absence of an indication of the forest type in the background surveys does not allow to determine the ecological-cenotic group (ECG) of the ground cover plants). The forest management project in the intact territory can be represented by a whole complex of elements (accounting of forest use in adjacent territories, study of background disturbances of the landscape, assessment of species and structural plant diversity, organization of «sparing forest use» in the zone of «limited forest use», identification and description of the most valuable sites by unified criteria, organization of an ecological network) that will support biodiversity and the implementation of environmental functions at the level of ecosystems (large forest landscape). The organization of nature management in IFL requires a whole range of knowledge on various issues of landscape design, ecology, geobotany, silviculture, forest inventory, geoinformation systems, etc. To do this, it is necessary to involve a wide range of stakeholders. Only such an approach will allow, on the one hand, to harmonize rational use of natural resources, on the other hand, to maximally preserve natural landscapes in their natural dynamics.

В работе анализируются особенности формирования лесных массивов Сибири в пределах двух лесных районов – Западно-Сибирского южно-таежного лесного и Нижнеангарского таежного. Объектами исследования явились лесные массивы с абсолютным преобладанием пихтовых древостоев, расположенных в пределах Енисейского, Чунского и Богучанского лесничеств. Целью настоящей работы явилось установление особенностей формирования таежного лесного массива с преобладанием пихтовых насаждений. Рассмотрена возрастная динамика таксационных показателей древостоев пихты сибирской зеленомошниковой группы типов леса. Дана математическая интерпретация хода развития древостоя по диаметру, высоте и запасу древесины на 1 га. В целом структура лесных массивов по средним высотам, средним диаметрам и запасам аппроксимируется функцией Гаусса. На завершающем этапе исследований было произведено распределение запаса между пихтовыми древостоями различного диаметра. Работа выполнена в рамках государственного задания Минобрнауки России на выполнение коллективом научной лаборатории «Защита леса» проекта «Фундаментальные основы защиты лесов от энтомо- и фитовредителей в Сибири» (№ FEFE-2020-0014).