关键词: 森林培育, 大径材, 人工林经营, 森林碳汇, 固碳量

Abstract: Plantations are important parts of forests and play important roles in increasing carbon sinks in terrestrial ecosystem. With strengthening of nation to forest resource protection, cultivating large-size timber forests has become important force to achieve strategic goal of carbon neutrality and alleviate contradiction between wood supply and demand. Plantations had large areas, but mainly consisted of middle-aged and young-aged forests in southern China. How to enhance productivity of forest land and increase carbon sinks is key problem. This thesis focused on carbon sequestration function of large-size timber forests. There were problems faced by cultivation of large-size timber forests in southern China, such as unclear resources of large-size timber forests and timber-forming mechanisms, unclear cultivation objectives of large-size timber forests, imperfect directional cultivation technological system of large-size timbers, severe soil degradations and single stand structures of plantations. Management countermeasures for synergistic enhancement to efficient cultivation of large-size timber forests and carbon sequestration capacity were proposed, including existing investigation of large-size timber forest resources, scientific planning of forest lands and site selections, breeding of superior varieties in precious native broad-leaved tree species, precise fertilization regulation and adjustment of stand structures, which could provide basis for scientific formulation of forest ecosystem management plans.

Key words: forest cultivation, large-size timber, plantation management, forest carbon sink, carbon sequestration