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子午岭辽东栎林林窗主要树种更新生态位

李永兵;王辉;付菁   

  1. 甘肃农业大学林学院, 兰州 730070
  • 收稿日期:2008-03-07 修回日期:1900-01-01 出版日期:2008-12-10 发布日期:2008-12-10

Regeneration niche of main tree species in Quercus liaotungensis forest gaps in Ziwuling Mountain.

LI Yong-bing; WANG Hui; FU Jing   

  1. College of Forestry, Gansu Agricultural University, Lanzhou 730070, China
  • Received:2008-03-07 Revised:1900-01-01 Online:2008-12-10 Published:2008-12-10

摘要: 在对子午岭林区辽东栎林中54个不同大小林窗调查的基础上,分析不同树种的更新生态位,结果表明:辽东栎林中不同树种的优势度随着林窗大小级的变化差异较大;根据各主要树种在不同大小级林窗内生态位宽度的变化,可分为生态幅度宽、中等、较小和狭小4类,其中大多数树种属于狭小生态幅宽度;辽东栎林中各主要树种在不同大小级林窗中的生态位重叠度较小,其中在100~200 m2林窗中的重叠度最小;在100~200 m2大小级林窗中,实生和萌生辽东栎的重要值和生态位宽度均大于0~100和200~300 m2 2个大小级林窗中的辽东栎,说明100~200 m2大小级林窗可为辽东栎的天然更新提供场所。

关键词: AM真菌, 频度, 孢子密度, 相对多度, 龙脑香科植物, 坡垒

Abstract: Based on the investigation at 54 different size gaps of Quercus liaotungensis forest in Ziwuling Mountain, the regeneration niches of different tree species in the forest were analyzed. The results showed that with the variation of gap size, the dominance of the tree species in Q. liaotungensis forest had greater difference. According to their niche breadth in the gaps, the main tree species were classified into 4 types, i.e., wide, medium, comparatively narrow, and narrow, and most of them belonged to the type of narrow niche breadth. The main tree species in the gaps had a smaller niche overlap, with the smallest one in 100-200 m2 gaps. The importance value and niche breadth of Q.liaotungensis were higher in 100-200 m2 gaps than in 0-100 and 200-300m2 gaps, indicating that 100-200 m2 gaps were the good habitats for the natural regeneration of Q. liaotungensis.

Key words: Hopea hainanensis, Dipterocarpaceae, Arbuscular mycorrhizal fungi, Frequency, Spore density, Relative abundance