关键词: 油松人工林, 间伐, 林分空间结构, 森林经营

Abstract: [Objective] The objective of the study was to explore the effects of density control on the spatial structure of Pinus tabulaeformis plantations.[Method] Based on the vegetation community investigation data of the six samples with reserve density of P. tabulaeformis plantation after thinning,the uniform angle index,mingling degrees and neighborhood comparison index were used to analyzed the spatial structure characteristics of P. tabulaeformis plantations in the rocky mountain area of Northern China.[Results] The results indicated that the mingling index and uniform angle index of P. tabulaeformis plantations decreased with the density increase.Neighborhood comparison of plantations with different density showed a fluctuating tendency with indistinctive differentiation and uniform distribution.The differentiation degree of plantations is higher.The plantations distributed uniformly as a whole,but transformed to random distribution pattern with the reserve density decrease.The minimum density (540 strains/hm²) had been in the succession process to uneven-aged and mixed forest.[Conclusion] Density control made the spatial structure optimized and reasonable.It was suggested that the succession of P. tabulaeformis plantations can be promoted by changing the species composition and competition relationship,such as instructing Quercus mongolica Fisch.ex Ledeb and other native species,removing the trees with smaller uniform angle index.

Key words: Pinus tabulaeformis plantation, density control, spatial structure, forest management