Study on the Community Structure and Underground Rhizome Growth Characteristics of Arundinaria fargesii in Different Habitats
[Objective]Arundinaria fargesii is a native bamboo species naturally distributed in Qinba Mountain range,with large resources scale and high development value of germplasm resources.However,as it is basically in the wild state and lacks management,there are significant differences in community structure,and some bamboo forests exhibit low-yield forests characteristics.Through investigation and analysis of the community structure and underground rhizome distribution characteristics of A.fargesii in different habitats,this paper reveals the adaptability of A.fargesii in different habitats,screening out natural community configuration models suitable for growth of A.fargesii,which thereby provides scientific basis for the bamboo forest nurturing practice and germplasm resources development and utilization of A.fargesii forests.[Method]The superlayer wood,population structure(age,culm height,diameter class)and underground rhizome distribution characteristics of A.fargesii community in different habitats were investigated by sample method and clone excavation method.[Result](1)The important values and niche widths of A.fargesii were the largest in all habitats,and the associated tree species were Castanea mollissima,Pinus armandi,Larix kaempferi,Toxicodendron vernicifluum,Quercus engleriana,etc.The ecological niche overlap value between A.fargesii and its associated tree species is relatively high,resulting in significant resources competition.(2)The comprehensive growth of A.fargesii in sample plot 4 was the best,the community succession tended to be stable with high habitat adaptability;the base diameter and plant height of A.fargesii in plot 4 were better than those in other plots,but the density was higher(second to plot 3);the population structure was mainly composed of bamboo of 3-year-old and over,with a small proportion of young bamboos,and the proportion of high-structure and large-diameter standing bamboos was higher than that of other plots.The length of underground rhizome isolators and internodes were the longest and the number of nodes was the least.[Conclusion]The structure of mixed multi-layer forests of bamboo and broad-leaved trees(canopy closure 0.6,altitude 1 871 m,slope 10°)is a community allocation model suitable for the growth and development of A.fargesii under natural conditions,and good habitat improves the resistance and stability of the forest stand.However,the weak community renewal ability is directly related to the relatively high ramet density.
万方数据
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