The forest stands phytomass purposeful studies in the Far East have not been carried out enough. Phytomass determination was mainly carried out as a necessary element for assessing physiological, hydrological and silvicultural processes in the forest. Phytomass largely determines the carbon sequestration, the litter amount, fire hazard, etc. (ibid.), its organic matter contributes greatly to the overall carbon and nitrogen cycle in the forest ecosystem. Research has been carried out to analyse the age 100-70 years pine plantations aboveground phytomass, growing in the Vladivostok agglomeration green zone. On the Vladivostok agglomeration green zone territory, four test plots were laid to assess the Korean pine phytomass according to the Atkin A.S. method, the size of the test plots was 0.4 hectares, the samples were laid in forest 3 types: rhododendral oak forests, shrub-forb oak forests, sedge ash forests - forbs. The Korean pine aboveground phytomass was calculated based on the Vladivostok forestry (stock) taxation description data. The presented materials’ analysis indicates that the Korean pine aboveground phytomass is characterized by high variability even within a specific forest type, it ranges from 7 to 35 t/ha (forest type D4). The data on any species’ trees aboveground phytomass reserves from the trial plots allow us to calculate the aboveground phytomass reserves on all trial plots and per 1 forest hectare.