关键词: 油松林, 间伐, 种群更新, 土壤肥力, 植被生物量, 物种多样性, 稳定性

Abstract: Tending and thinning are the key policies in forest management, which play important roles in forest stability. In order to understand the effects of tending and thinning intensity on population regeneration, soil fertility, vegetation biomass and species diversity, vegetation communities and soil characteristics were investigated in the Pinus tabulaeformis plantations in Forest Bureau of Mulan-Weichang, Hebei province, China. Four kinds of plantations were selected with different tending and thinning intensity, including 47.65% thinning(Ⅰ), 56.38% thinning(Ⅱ), 66.44% thinning(Ⅲ) and an un-thinned plantation(CK). The community stability was also evaluated by calculating the subordinate function values based on a fuzzy comprehensive evaluation. The results showed that, the potential regeneration capacity of P. tabulaeformis plantations increased with the increase of thinning intensity. Soil fertility also showed an increasing trend with the increase of thinning intensity. In contrast, thinning reduced the stumpage, while increased shrub and grass biomass. Compared the thinning with other intensity, moderate thinning improved the species diversity. Additionally, the community stability showed the order as Ⅲ > Ⅱ > Ⅰ > CK. The results suggested that thinning could improve community stability, could be suitable for the cultivation and management of local Pinus tabulaeformis plantation.

Key words: Pinus tabulaeformis plantation, thinning, population regeneration, soil fertility, vegetation biomass, species diversity, community stability