Coarse Woody Debris Dynamics in Relation to Disturbances in Korea's Odaesan National Park Cool-Temperate Forests

Coarse woody debris (CWD) has historically been extensively utilized in Korea, with significant accumulation occurring mainly after the establishment of protected areas. This study, conducted in Odaesan National Park (designated in 1975), investigated the distribution and characteristics of CWD across five forest types with permanent plots. It also examined the effects of human and natural disturbances on CWD dynamics and evaluated its role in carbon storage. CWD mass varied significantly, ranging from 0.7 Mg ha-1 in Pinus-Quercus (PQ) forests to 31.9 Mg ha-1 in Broadleaved-Abies (BA) forests. The impacts of disturbances shifted markedly before and after the park's designation; prior to this, human activities such as logging substantially affected BA, PQ, and Prunus-Salix (PS) forests, while Quercus-Tilia (QT) forests were primarily impacted by wildfires. After designation, natural disturbances became the primary contributors to CWD accumulation, with a major windstorm in BA forests adding 12.09 Mg ha-1 of CWD (37.8% of the total). Late-successional forests exhibited higher CWD mass, advanced decay stages, and greater diversity, as well as elevated CWD-to-carbon storage ratios, highlighting their role as crucial carbon reservoirs. In light of climate change, these findings emphasize the need for forest management practices that enhance CWD's contributions to biodiversity conservation and carbon storage.