Abstract: Pinus sibirica is an important cold-temperate tree species introduced and planted in the Great Xing’an Mountains, which directly affects forest ecosystem structure and carbon sequestration. Analyzing the long-term effects of planting P. sibirica on aboveground biomass of forests has significant implications for clarifying regional carbon sinks and carbon neutrality. We assessed the dynamic changes in aboveground biomass of various native tree species based on field survey data and forest landscape model. The introduction and planting of P. sibirica played a positive effect on the forest aboveground biomass at landscape scale. P. sibirica should thus be introduced and planted at a large scale in the future. The increasing rates of aboveground biomass under different planting intensity scenarios were basically similar, with a maximum of 8.66 Mg·hm^-2 in low-intensity planting scenario. The change rates in aboveground biomass differed significantly among major native tree species. The aboveground biomass increased by 0.19-8.88 Mg·hm^-2 for Larix gmelinii and Picea koraiensis, while decreased by 0.42-12.86 Mg·hm^-2 for Pinus sylvestris var. mongolica, Populus davidiana, and Betula platyphylla.

Key words: Pinus sibirica, aboveground biomass, forest landscape model, tree introduction and planting, the Great Xing’an Mountains.