摘要
<正>在林业实践中,通过天然更新和人工促进更新的方法,能促进人工林向天然林转化,使其天然树种增加,林分结构更加复杂,生态系统更加稳定[1]。在天然林采伐迹地更新起来的人工林,虽然经过炼山、整地、人工造林等活动,但由于保留有天然树种的繁殖体(土壤种子库、树根、伐桩等)及附近天然林中植物种子迁移,在适宜的条件下能成功完成天然更新[2-5],这些具"潜在天然林恢复基础"的人工林通过天然更新往往都能恢复为天然林[6]。
25-years-old Cunninghamia lanceolata forests and 18-years-old Acacia mangium forests in Jianfengling of Hainan Province were surveyed to assess the structures and species diversity of naturally-regenerated plants. The results showed that there were 131 species in C. lanceolata forests,attributed to 100 genera and 51 families. The dominant species were Gironniera subaequalis,Schima superba,Pertusadina metcalfii and Polyspora hainanensis.There were 62 species in A. mangium forests,attributed to 59 genera and 33 families. The dominant species were Acronychia pedunculata,Tetradium glabrifolium,Machilus chinensis,Gironniera subaequalis and Toxicodendron succedaneum. The species richness,Simpson index and Shannon-Wiener index for naturally-regenerated plants in C.lanceolata forests were 76. 67 ± 11. 02,0. 94 ± 0. 04 and 3. 50 ± 0. 49,while those in A. mangium forests were39. 00 ± 8. 54,0. 91 ± 0. 04 and 3. 05 ± 0. 27. The Srensen species similarity for naturally-regenerated plants of the two forests was 0. 50,with a increasing age structure. The mean density,height and dbh for adult trees of naturallyregenerated components of C. lanceolata forests were significantly lower than A. mangium forests; while the mean density and height of small tress of naturally-regenerated components of C. lanceolata forests were significantly higher than A. mangium forests. The study indicated that the naturally-regenerated plant species increased,and the forest structures became complex with the regeneration of both C. lanceolata and A. mangium forests. These two pure plantations will become old-growth natural forests with the forest succession.
引文
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