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【目的】明晰林窗尺度对侧柏人工林植物多样性的短期影响。【方法】在江苏徐州九里山阳坡面调查开设2a后的3种尺度林窗(半径4 m林窗,编号S;8 m林窗,编号M;12 m林窗,编号L)中的植物多样性。【结果】(1)与对照样地(林窗附近样地)相比,不同尺度林窗内植物种类均有所增加。其中:灌木层植物在L、M、S林窗中分别增加了4种、7种、2种,草本层植物分别增加了4种、1种、3种,更新树种增加了2种、1种、1种。(2)除S林窗的灌木层外,林窗中的Margalef指数均显著大于对照样地(P<0.05),灌木层Margalef指数的最大值出现在M林窗,草本层中最大值出现在L林窗;L林窗和M林窗中灌木层的Shannon-Weiner指数显著高于对照样地(P<0.05);L林窗草本层的Pielou均匀度指数显著高于对照样地(P<0.05),并随林窗尺度增大基本呈现降低趋势。【结论】与S和L林窗相比,M林窗(半径8 m)对徐州侧柏人工林植物多样性和更新树种的增加有更大的促进作用。
【Objective】 The objective of this study was to clarify the short-term effects of gap scale on the plant diversity of Platycladus orientalis plantations. 【Method】 Three species of canopy gaps (the radius of 4 m canopy window, No. S; 8 m canopy window, No. M; 12 m canopy window, No. L) were surveyed in Jiulishan Yang slope of Xuzhou, Jiangsu Province. Diversity. 【Result】 (1) Compared with the control plots (plots adjacent to the glints), the plant species in the glenospores of different scales increased. Among them, four species, seven species and two species were increased in shrub layer in L, M and S, respectively, and four species, one species and three species were increased in herbaceous species, two species and one species , 1 species. (2) The marginal Margalef index was significantly larger than that of the control plots (P <0.05) except for the shrub layer of S-shaped gap. The maximum value of Margalef index of shrub layer appeared in the M-shaped gap with the maximum value in herb layer L forest window; Shannon-Weiner index of shrub layer in L and M window was significantly higher than that in control sample (P <0.05); Pielou evenness index of L forest window layer was significantly higher than that in control sample (P < 0.05), and with the size of the forest window increases basically showed a downward trend. 【Conclusion】 Compared with the S and L gaps, M window (8 m in radius) can promote the plant diversity and the increase of new species in the plantations of.