生物多样性 ›› 2006, Vol. 14 ›› Issue (5): 435-443.doi: 10.1360/biodiv.060008

• 论文 • 上一篇    下一篇

三峡库区世坪常绿阔叶林群落特征

赖江山1, 2, 张谧1, 谢宗强1*   

  1. 1 (中国科学院植物研究所植被数量生态学重点实验室, 北京 100093)
    2 (中国科学院研究生院, 北京 100049)
  • 收稿日期:2006-01-12 修回日期:2006-04-21 出版日期:2006-09-20
  • 通讯作者: 谢宗强

Characteristics of the evergreen broad-leaved forest in Shiping Forest Park, Three Gorges Reservoir Area

Jiangshan Lai1, 2, Mi Zhang1, Zongqiang Xie1*   

  1. 1 Key Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093
    2 Graduate School of the Chinese Academy of Sciences, Beijing 100049
  • Received:2006-01-12 Revised:2006-04-21 Online:2006-09-20
  • Contact: Zongqiang Xie

重庆丰都世坪森林公园的常绿阔叶林是长江三峡库区低海拔区残存的较典型常绿阔叶林, 林内植物种类丰富。1hm2固定样地的调查表明, 群落内共有维管束植物195种, 隶属73科142属, 植物的科属组成丰富。群落内区系地理成分复杂, 与热带植物区系关系较密切, 但温带区系成分也占有相当大的比重。群落的外貌主要由中小型革质、单叶为主的常绿高位芽植物所决定。群落成层现象明显, 可分为乔木层、灌木层和草本层3个层次, 层间植物丰富。总之, 无论区系组成还是群落外貌和结构均体现了中亚热带北缘常绿阔叶林的特征。世坪森林公园的常绿阔叶林是三峡库区宝贵的植物基因库, 希望有关部门尽快在此设立常绿阔叶林保护区, 以保护本地区植被恢复的种质资源。

关键词: 最小面积, 二元指示种分析, 种 - 面积曲线

The portion of the Yangtze River valley between Chongqing and Yichang is known as the Three Gorges Reservoir Area (TGRA). The total area of TGRA is approximately 54,000 km2. Located in the central sub-tropical zone in China, TGRA has a humid subtropical monsoon climate. Originally, the flora in this area was subtropical evergreen broad-leaved forests dominated by Castanopsis, Cyclobalanopsis, Quercus, Phoebe and Cinnamomum. However, as a result of long-term human activity, such as widespread agriculture, the forest vegetation below 1,000 m a.s.l. has been almost completely destroyed, and the current land cover is dominated by secondary masson pine (Pinus massoniana) forest, cypress (Cupressus funebris) forest, and crop lands. The evergreen broad-leaved forest in Shiping Forest Park (SFP, 29º47′40″N,107 º37′40″E) is the remaining evergreen broad-leaved forest typical of TGRA. Although the forest in SFP is not completely ma-ture or in a steady state, it is a valuable gene bank of native plant species. For the conservation of these for-ests, a good understanding of their biodiversity is needed. We established an 1.0 hm2 permanent plot in SFP, and then divided it into 100 subplots. In the plot, 195 species of vascular plants were recorded, belonging to 142 genera and 73 families. Of these, 12 families, 16 genera and 18 species are pteridophytes; 2 families, 2 genera and 2 species are gymnosperms, and 59 families, 123 genera and 174 species are angiosperms. Among the angiosperms, dicotyledon has 49 families, 104 genera and 152 species, and monocotyledon has 10 families, 20 genera and 23 species. The families, ranked by the number of species, are Caprifoliaceae (10), Lauraceae (8), Myrsinaceae (8), Fabaceae (7), Rubiaceae (7), Fagaceae (6), Theaceae (6), Vitaceae (6), Lili-aceae (6), Ericaceae (5), Rosaceae (5), Euphorbiaceae (5), and Gramineae (5). The genera ranked by the number of species are Viburnum (7), Eurya (5), Symplocos (4), and Ardisia (4). In the flora of 61 seed plant families, those of cosmopolitan distribution contribute 34.43%, those of tropical and subtropical distribution contribute 45.90%, and those of temperate distribution contribute 18.03%. In the flora of 126 seed plant gen-era, total tropical distribution elements compose 52.94% of the total, while total temperate distribution ele-ments contribute 45.38%. Thus, the flora of the forest is tropical in nature and has strong temperate affini-ties. According to Raunkiaer′s classification system of life forms, phanerophytes are the most abundant in this community, epiphytes, hemicryptophytes and geocryptophytes come next, while chamaephytes and therophytes are rare. Considering leaf form, 78.35% have simple leaves, while 21.65% have compound leaves. Considering leaf size spectra, microphyllous contributes 48.97%, followed by mesophyllous (41.75%), macrophyllous (6.19%), and nanophyllous (3.09%). In leaf texture spectra, the plants with her-baceous leaves compose 57.22%, while those with leathery leaves compose 30.41%, thick leathery 10.82%, and membranous 1.55%. The plants with entire leaf margins account for 51.03% of the total spe-cies, while those with non-entire leaf margins are 48.97%. As the structure of the stand, from the aerial top to the forest floor, there are three distinct layers, namely tree layer, shrub layer and herb layer. The tree layer can be further subdivided into three recognizable sub-layers: upper, middle and lower tree layers. The upper tree layer is dominated by Castanopsis carlesii, as well as C. fargesii and Liquidamber formosana. Phoebe zhennan, Elaeocarpus decipiens, E. japonicus, Pinus massoniana, Choerospondias axillaris, and Cornus controversa also appear in the upper tree layer. In addition to species appearing in the upper tree layer, Viburnum betulifolium, Camellia oleifera, Cinnamomum wilsonii, Ilex szechwanensis and Turpinia affinis are common in the middle tree layer. Most species of the lower tree layer also appear in the upper two layers, except for a few small trees such as Cornus macrophylla, Viburnum brachybotryum, Pithecel-lobium lucidum, Rhododendron hypoglaucum, Itea chinensis, Pittosporum truncatum, Symplocos stapfi-ana, and S. stellaris.

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