An island's original ecosystem
The remaining old-growth forests on Sakhalin Island are living examples of a dark coniferous taiga. This ecosystem is dominated by Sakhalin fir (Abies sachalinensis) and Jezo spruce (Picea jezoensis). Sakhalin fir can grow to 30 meters tall, with trunks reaching 100 cm in diameter. These forests often feature a dense, nearly impassable undergrowth of Kurile bamboo (Sasa kurilensis), a plant that can thrive in the low light beneath the conifer canopy.
The island's climate, shaped by the cold Sea of Okhotsk and warmer Sea of Japan, produces long, cold winters and short, humid summers with frequent fog. This environment, combined with mountainous terrain, creates distinct vegetation zones. In the southern and central mountains, the spruce-fir taiga is most prominent. At lower elevations, these coniferous forests mix with broadleaf trees like Erman's birch (Betula ermanii), Mongolian oak, and Manchurian ash. The island’s unique geography and climate support many types of vegetation, and of the 1,313 wild plant species found here, 88 exist nowhere else.
A forest transformed by industry
Industrial logging dramatically altered Sakhalin's landscape during the 20th century. The demand for wood pulp for the paper industry made Sakhalin fir a primary target for harvesting. Extensive clearcutting, particularly in the more accessible southern and central regions, removed vast areas of virgin spruce and fir taiga. These dark conifer forests are poorly adapted to recover from large-scale logging and subsequent fires. Natural regeneration on cleared sites is often impossible, leading to the land becoming overgrown with sparse birch forest, bamboo thickets, or turning into marshland.
The surviving remnants of old-growth forest are now found primarily in rugged, hard-to-reach areas, such as the watersheds of the Pursh-Pursh and Vengeri Rivers. These patches of pristine forest have escaped logging due to their remote location and challenging terrain. Conservation efforts have led to the establishment of protected areas, including the Poronaysky Nature Reserve, to safeguard what is left of these complex ecosystems. These remnants protect important habitat for species like the endemic Sakhalin musk deer (Moschus moschiferus sachalinensis), brown bears, and vulnerable birds like the Steller's sea eagle and Blakiston's fish owl.