IMPACT OF WILDFIRE AND WINDFALL ON PHYTOCENOCIS OF STONE PINE-BROAD-LEAVED FOREST (BY THE DATA OF 60-YEARS MONITORING)
A. V. Ivanov1,2, M. A. Salo3, S. N. Bondarchuk3, N. A. Kochkarina1
1Primorsky State Agricultural Academy, Ussuriysk, Russian Federation
2Far Eastern Forestry Research Institute, Khabarovsk, Russian Federation
3Sikhote-Alin State Natural Biosphere Reserve named after K. G. Abramov, Terney, Russian Federation
Keywords: лесное насаждение, постоянная пробная площадь, прирост, отпад, фитомасса, forest stand, permanent sample plot, increment, fall off, phytomass
Abstract
We present the results of an analysis of forest stand dynamics on a permanent trial plot in the Sikhote-Alin biosphere reserve (Primorsky Krai). The materials of revisions for the period 1958-2019 were used, where the plot was established on young growth forest, which emerged after a strong wildfire in the 1920s succeeding in the place of which a highly productive pine trees. The last inventory (2019) reflects the state of the plantation after strong windfall due to the typhoon Lyonrock in 2016: the growing stock of the stand decreased from 254 to 180 m³ · ha-1. Currently the total average (stock) increment is 4.7- 8.4 m³ · ha-1 · year-1, losses due to windfall varied between 1.4-3.0 m³ · ha-1 · year-1 and were 12.0 m³ · ha-1 · year-1 for the last observation period. Sufficient seedlings for a further recovery of the main species (Korean pine Pinus koraiensis Siebold & Zucc.) are present only at sites without disturbance by windfall (up to five thousand plants ha-1). Using regional allometric equations, the above-ground biomass of trees and stands was determined for each inventory period, which made it possible to estimate the net growth of the biomass at 1.31 t C · ha-1 · year-1, which is more than two times higher than the average specific carbon stock in the biomass of the forests of Terney forest district estimated by the ROBUL system. Windfall decreased the biomass stock in the forest stand from 89 to 60 t C · ha-1. The stand developed following a long-term regeneration scenario, but further stand dynamics are unpredictable due to the instability of the rest of the stand.
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