Biodiversity Science ›› 2015, Vol. 23 ›› Issue (6): 815-823.doi: 10.17520/biods.2015024

• Orginal Article • Previous Article     Next Article

Community composition and structure of Rhododendron simsii shrubland in the Dawei Mountain, Hunan Province

Jiaxiang Li1, 2, 3, Xu Zhang2, Zongqiang Xie1, *(), Congfa Lu4, Xiangyang Tu5, Yuan Xun6   

  1. 1 State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093
    2 College of Forestry, Central South University of Forestry and Technology, Changsha 410004
    3 University of Chinese Academy of Sciences, Beijing 100049
    4 Liuyang Forestry Bureau, Liuyang, Hunan 410300
    5 Dawei Mountain National Forest Park, Liuyang, Hunan 410309
    6 Administration Bureau of Dawei Mountain Nature Reserve, Liuyang, Hunan 410309
  • Received:2015-01-25 Accepted:2015-08-29 Online:2015-12-02
  • Xie Zongqiang E-mail:xie@ibcas.ac.cn

As one of the most important natural vegetation types of terrestrial ecosystems, shrublands play an important role in vegetation succession, biodiversity conservation and ecological balance. Based on the data collected in six Rhododendron simsii shrubland permanent plots established in the Dawei Mountain Nature Reserve in Liuyang, Hunan Province, China in 2012, we analyzed species composition and community structure. The results were as follows: There were 36 families, 50 genera and 58 vascular plant species including 19 woody species and 39 herbaceous species in the community without woody vine species. Floristic composition was dominated by the temperate elements and affected strongly by tropical and subtropical flora. The physiognomy was short and the vertical structure of the community was distinct with obvious shrub and herb layers. Most individuals of shrub species were concentrated in the 1-2 m height class. The shrubland was a type of the montane mesophilius deciduous broad-leaved thickets, belonging to the temperate deciduous broad-leaved thicket formation group. The life-form spectrum reflected the cold climatic conditions due to the high percentage of phaenerophytes and hemicryptophytes in the community. There were obvious dominant species in the community that had a high stability and uniformity. The analysis of height and base area classes of the shrub layer indicated mid-size individuals had conservative life strategies in this community, and R. simsii was a future declining population. Generally, the results suggest that R. simsii shrubland is at an early or middle successional stage and will develop into a subtropical montane evergreen and deciduous broad-leaved mixed forest or evergreen broad-leaved forest.

Key words: montane shrubland, temperate deciduous broad-leaved shrubland, declining population, early successional stage, subtropics

Fig. 1

The location map (A) and plot setting (B) of Rhododendron simsii shrubland plot in Dawei Mountain"

Table 1

Species composition in the shrub layer of Rhododendron simsii shrubland in the Dawei Mountain"

物种 Species 株数
No. of individual
平均基径
Mean BD
最大基径
Maximum BD
(cm)
均高
Mean H
(m)
最大高
Maximum
H (m)
基面积
Basic area (m2/ha)
相对密度RD (%) 相对显著度RM (%) 重要值
IV (%)
杜鹃 Rhododendron simsii 5,689 1.59 8.37 1.45 4.20 19.44 87.54 84.28 63.66
湖南白檀 Symplocos hunanensis 455 1.65 9.82 1.34 4.89 2.57 7.00 11.13 12.43
四川冬青 Ilex szechwanensis 98 0.96 4.21 0.99 2.77 0.14 1.51 0.61 5.20
渐尖叶日本绣线菊
Spiraea japonica var. acuminata
105 0.84 2.47 1.27 2.12 0.10 1.62 0.41 5.17
圆锥绣球 Hydrangea paniculata 25 2.70 7.42 1.66 2.91 0.33 0.38 1.42 2.73
格药柃 Eurya muricata 29 1.10 3.23 1.00 2.42 0.05 0.45 0.24 2.36
波叶红果树
Stranvaesia davidiana var. undulata
16 1.04 2.38 1.07 1.93 0.03 0.25 0.13 1.54
尾叶樱桃 Cerasus dielsiana 8 2.45 6.41 2.00 5.12 0.08 0.12 0.35 1.10
鹿角杜鹃 Rhododendron latoucheae 10 3.48 5.90 1.78 2.43 0.18 0.15 0.76 1.01
直角荚蒾
Viburnum foetidum var. rectangulatum
37 0.77 4.36 1.06 1.78 0.04 0.57 0.19 0.96
水马桑 Weigela japonica var. sinica 14 1.63 3.24 1.53 2.25 0.05 0.22 0.22 0.85
四照花 Cornus kousa subsp. chinensis 3 1.34 1.98 1.64 2.51 0.01 0.05 0.03 0.74
中国绣球 Hydrangea chinensis 3 2.05 3.73 1.54 2.01 0.02 0.05 0.09 0.52
石灰花楸 Sorbus folgneri 2 2.14 2.40 1.82 1.92 0.01 0.03 0.05 0.50
胡颓子 Elaeagnus pungens 1 2.50 2.50 3.00 3.00 0.01 0.02 0.03 0.25
三桠乌药 Lindera obtusiloba 1 2.07 2.07 2.82 2.82 0.01 0.02 0.02 0.25
紫珠 Callicarpa bodinieri 1 2.04 2.04 1.70 1.70 0.01 0.02 0.02 0.25
小叶栎 Quercus chenii 1 1.38 1.38 2.12 2.12 0.00 0.02 0.01 0.24
长叶冻绿 Rhamnus crenata 1 0.89 0.89 1.76 1.76 0.00 0.02 0.00 0.24
合计 Total 6,499 1.57 9.82 1.43 5.12 23.06 100.00 100.00 100.00

Table 2

Importance values (IV) of species in herb layer of Rhododendron simsii shrubland in the Dawei Mountain"

物种 Species 平均高
Mean hight (m)
盖度
Coverage (%)
密度
Density
(individual/m2)
频度
Frequency (%)
重要值
(%) IV
短尖薹草 Carex brevicuspis 0.19 32.27 18.11 44.44 18.86
香港双蝴蝶 Tripterospermum nienkui 0.08 6.60 12.41 92.59 13.55
Miscanthus sinensis 0.74 28.46 2.89 62.96 12.00
十字苔草 Carex cruciata 0.12 22.75 6.11 48.15 10.23
野青茅 Deyeuxia arundinacea var. arundinacea 0.42 12.44 4.11 62.96 9.43
扬子小连翘 Hypericum faberi 0.27 3.83 3.04 48.15 4.63
华东山芹 Ostericum huadongense 0.52 5.22 1.30 55.56 4.34
翠云草 Selaginella uncinata 0.10 4.83 3.74 29.63 4.18
九华蒲儿根 Sinosenecio jiuhuashanicus 0.25 9.69 2.89 22.22 3.57
异叶茴芹 Pimpinella diversifolia 0.22 12.42 1.63 18.52 2.77
珍珠菜 Lysimachia clethroides 0.40 2.80 0.59 29.63 2.01
五岭龙胆 Gentiana davidii 0.11 1.58 0.44 25.93 1.60
Pteridium aquilinum var. latiusculum 0.43 3.44 0.22 22.22 1.52
紫萼 Hosta ventricosa 0.23 2.13 0.37 18.52 1.22
金星蕨 Parathelypteris glanduligera 0.15 4.00 0.59 11.11 1.04
其他24种 Other 24 species 0.26 1.82 2.80 9.05
合计39种 Total 39 species 0.27 40.00 100.00

Table 3

The areal-types of genera of seed plants in Rhododendron simsii shrubland in the Dawei Mountain"

分布区类型Areal-type 属数
No. of genera
比例
%
1 世界分布 Cosmopolitan 5 -
2 泛热带分布 Pantropic 7 18.42
3 热带亚洲和热带美洲间断分布
Tropical Asia and Tropical America disjointed
1 2.63
4 旧世界热带分布 Old World Tropic 1 2.63
7 热带亚洲分布 Tropical Asia 3 7.89
8 北温带分布 North Temperate 14 36.84
9 东亚和北美洲间断分布
East Asia and North America disjointed
4 10.53
10 旧世界温带分布 Old World Temperate 2 5.26
11 温带亚洲分布 Temperate Asia 1 2.63
14 东亚分布 East Asia 5 13.16
合计 Total 43 100.00

Fig. 2

Basal diameter (BD) size-class distribution of all species and dominant species in Rhododendron simsii shrubland in the Dawei Mountain. The digitals under the x-coordinates represent the ten classes of basal diameter, respectively: < 1 cm, 1-2 cm, 2-3 cm, 3-4 cm, 4-5 cm, 5-6 cm, 6-7 cm, 7-8 cm, 8-9 cm, > 9 cm."

Fig. 3

The height structure of all species and dominant species in Rhododendron simsii shrubland in the Dawei Mountain. The digitals under the x-coordinates represent the six height classes, respectively: < 0.5 m, 0.5-1.0 m, 1.0-1.5 m, 1.5-2.0 m, 2.0-2.5 m, > 2.5 m."

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