Biodiv Sci ›› 2017, Vol. 25 ›› Issue (3): 255-264.DOI: 10.17520/biods.2016274

• Orginal Article • Previous Articles     Next Articles

Species composition and community structure of the Yulongxueshan (Jade Dragon Snow Mountains) forest dynamics plot in the cold tem- perate spruce-fir forest, Southwest China

Hua Huang1, Zhifa Chen1, Detuan Liu1, Guoxing He2, Ronghua He2, Dezhu Li1,*(), Kun Xu1,*()   

  1. 1 Lijiang Forest Ecosystem Research Station, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201
    2 Administration Bureau of Yulongxueshan Provincial Nature Reserve, Lijiang, Yunnan 674100
  • Received:2016-09-22 Accepted:2017-01-23 Online:2017-03-20 Published:2017-04-07
  • Contact: Li Dezhu,Xu Kun

Abstract:

Spruce-fir forests are one of the best protected areas of forest vegetation occurring on the eastern slope of the Yulongxueshan (Jade Dragon Snow Mountains). To further understand the spruce-fir species composition and community structure, a 25 ha (500 m × 500 m) forest dynamics plot was established in the Yulongxueshan Provincial Nature Reserve by the Kunming Institute of Botany, Chinese Academy of Sciences and Administration Bureau of Yulongxueshan Provincial Nature Reserve from 2012 to 2014, according to the standards from the Center for Tropical Forest Science (CTFS). In this study, we analyzed the flora, community composition, structure, DBH size-classes and spatial distribution based data collected from all woody (excluding bamboo) plants with DBH ≥ 1 cm. Our results demonstrated that a total of 47,751 free-standing individuals with DBH ≥ 1 cm were recorded, belonging to 62 species, 41 genera and 26 families. The north temperate distribution plant contributed to the most significant floristic characteristics. In the plot, the 18 species with importance value (IV) ≥ 1 contributed 90.24% to the IV of the community. Based on the vertical structure of plant heights, the community was divided into four layers. The dominant species in the canopy layer were Abies forrestii, Picea likiangensis and Quercus guajavifolia, which exhibited a pattern of ridge type and a reverse-J shape in DBH size-classes structure and strong regenerating capacity. Gamblea ciliata var. evodiifolia, Acer pectinatum and Padus brachypoda occupied the sub-canopy layer, and could be the constructive community species in some fragmented habitats. These species were lacking small DBH trees, so their populations are predicted to decline in the future. Sorbus prattii, Viburnum betulifolium and Rhododendron yunnanense dominated the sub-tree layer. In the shrub layer, Berberis fallax consisted of the largest number of individuals and accounting for 59.51% of the total number of individuals; together with the highest importance value, accounting for 22.75% of the total IV, and DBH size-class distribution in a “L” shape.

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Key words: biodiversity, DBH size-classes structure, flora, spatial pattern