**1. Introduction**

In the context of modern global climate change, forest ecosystems play an important part in stabilizing the ecological state. According to international standards, mixed, complex forests that have a large biological diversity are of particular importance. In this regard, the forests of the Irkutsk region are mostly of natural origin, often based on pyrogenic factors. Many forests are classified as high conservation value forests according to FSC standards. Basically, the forests of the Irkutsk region belong to light-coniferous taiga. Recently, the content of larch in the total composition of the forests of the Irkutsk region has been decreasing both in percentage terms by area and by age groups. In this regard, a special task is to preserve and multiply mixed pine and larch plantations of natural and artificial origin in the Angara region on the example of the Irkutsk region. The relevance of the topic lies in the study of the state of mixed pine-larch stands on the example of forests in the Irkutsk region and recommendations for the creation of pine-larch forest crops.

The features of growth of mixed and complex pine stands were studied by many authors: Buzykin and Pshenichnikov [1]; Varaksin et al. [2]; Gvozdev [3]; Klyuchnikov [4]; and Plaksiva et al. [5]. However, the regularities of the composition and growth, formation, and structure of mixed stands of the East Siberian taiga are not fully studied, especially for the Irkutsk region. The author [6–9] studied the growth and formation of pine and larch plantations in the conditions of the Angara taiga region (on the example of the Irkutsk region).

The scientific novelty of the research is that on the basis of the conducted research and generalization of information about the regularities of formation, growth and structure of mixed forest cultures, the dynamics of formation of the main inventory indices, and the quality of the stem wood of artificially grown mixed crops were studied. For the first time, forest management and inventory indices of mixed pine and larch plantations in the Angara region of the Irkutsk region, various age classes, and forest cultures were observed for the study areas. The features of the formation of annual rings of pine and larch in mixed forest cultures were studied.
