Лісівничо-таксаційна характеристика насаджень у вольєрах Західного Полісся

Artificial limitation of the living space of the population functioning in the conditions of semi-free maintenance of animals certainly causes a threat to the forest stand ecosystem integrity with subsequent processes of their degradation within the sanctuary boundaries. The basis for performing the forest taxation analysis of tree stands in the sanctuaries is the sub-compartment valuation descriptions of forest enterprises of Rivne and Volyn Regional Departments of Forestry and Hunting. There are 24 enclosures with the total area of ​​1524.1 ha in the territory of Western Polissya. The forest fund is found to occupy 1272.7 ha and field land – 251.4 ha respectively. The sanctuaries are characterized by 21 forest types. They are considered to be as follows: 5 in pine forest conditions, 5 in mixed coniferous forest conditions, and 11 in mixed broadleaved forest conditions. The most common forest types in Western Polissya are С4Влч (303.6 ha), В3ДС (245.5 ha) and С3ГДС (159.4 hectares). Mixed stands prevail covering the area of 396.2 ha (35.0 %) with predominance of pine (Pinus sylvestris L.) and birch (Betula pendula Roth.). They are represented by 16 types of forest. С3ГДС (188.8 ha), С4Влч (66.9 ha) and В3ДС (60.8 ha) occupy the largest area. Middle-aged stands dominate (174.3 ha) in mixed forest. Their growing stock is 0.70. Site index of tree stands are mainly Іа (61.3 ha), I (168.1 ha), and II (117.7 ha). Pine stands occupy the largest area among pure stands – 359.3 hectares (31.7 %). The area of ​​pure alder and birch stands is respectively 255.7 hectares (22.6 %) and 113.3 ha (10.0 %). Maturing stands dominate among pine forest stands. Their area is 138.6 ha, where there are 57.7 ha of artificial origin stands. Average growing stock is 0.71. The area of ​​the stands of Іа and I site indexes is 258.7 has (72.0 %). Pure alder stands are represented by 4 forest types, where С4Влч (235.6 ha) dominates. Middle-aged stands dominate according to the age structure – 172.0 ha (67.3 %). The growing stock of alder stands is 0.73. Tree stands grow in the Іа – V classes of site index. Middle-aged stands in the sanctuaries generally dominate in the region of research. Their area is 463.0 ha (40.9 %). The stands mostly grow by I (514.9 ha), Іа (167.4 ha), and II (334.0 ha) of site index. Forest taxation indicators of tree stands are to become the key factors in designing sanctuaries that will enable elaborating recommendations on the non-exhausting maintenance of sanctuaries in hunting farms in forests.