气候变化领域集成服务门户

Stand structure indices were examined in this study to clarify stand structure and interaction among individual trees. This analysis provides a greater understanding of density-dependent interactions among intraspecific trees with different vitality using a point pattern analysis method. This study was undertaken in Hulunbuir Sandland, Inner Mongolia, China, in natural Pinus sylvestris L. var. mongolica Litv. stands which have different densities and relatively little human interference Results for Regeneration seedlings (R-seedlings) (31.07% +/- 15.5), Suppressed trees (S-trees) (55.0% +/- 13.3) and Dominant trees (D-trees) (13.3% +/- 2.6) indicated that this forest was under a period of renewal and growth. Apart for R-seedlings, growth dynamics differed depending on the density gradient in all plots, and obvious significant differences were recorded between S-trees growth and density gradient. The spatial distribution of S-trees was also found to have a significant impact on germination and growth of R-seedlings in these forests. However, D-trees did not directly affect germination and survival of R-seedlings. Findings from this study will provide a reference for afforestation, reforestation and plantation management in close-to-nature forests.