江西三清山浙江楠群落主要种群生态位研究

对三清山浙江楠Phoebe chekiangensis群落9个主要乔木种群的生态位特征进行研究，采用Shannon-Wiener指数和Hurlbert指数测定群落中主要种群生态位宽度和生态位重叠。结果显示，毛竹Phyllostachys heterocycla、枫香Liquidambar formosana、棕榈Trachcarpus fortunei和浙江楠的生态位宽度较大；枫杨Pterocarya stenoptera、油茶Camellia oleifera、苦槠Castanopsis sclerophylla、梅Armeniaca mume和青冈栎Cyclobalanopsis glauca的生态位宽度较小。青冈栎与苦槠种对生态位重叠最大，毛竹或枫香与梅种对最小。表明种群生态位宽度值越大，对环境的适应能力就越强，对资源的利用能力也就越强；生态位重叠值越高，种对的生态位相似性越大，资源利用的相似程度越强；种对生态位宽度值大一般生态位重叠值就大，种对生态位宽度值小，在相同或相似环境条件下的生态位重叠值也较大，种对生态位宽度值差异大的生态位重叠值较小。

The Niche of Main Populations of Phoebe chekiangensis Community in Sanqingshan Mountain,Jiangxi Province

The niche characteristics of 9 tree species of Phoebe chekiangensis community in Sanqingshan Mountain were analyzed. The niche breadths and niche overlaps of main species in the community in the sample plot were measured by using Shannon-Wiener index and Hurlbert index. The results showed that the niche breadth of Phyllostachys heterocycla, Liquidambar formosana, Trachcarpus fortunei and Phoebe chekiangensis were bigger，which of Pterocarya stenoptera, Camellia oleifera, Castanopsis sclerophylla, Armeniaca mume and Cyclobalanopsis glauca were smaller. The niche overlap of Cyclobalanopsis glauca and Castanopsis sclerophylla was the biggest among all of species, Phyllostachys heterocycla or Liquidambar formosana and Armeniaca mume was the least. The wider of niche breadth, the higher capability of adapting environment, the more powerful capability of utilization resources. The niche overlap among species was higher, the niche similarity between species was greater, similarity of utilization resources was more powerful. The niche overlap between species with broad niche breadth was generally greater, which between species with narrow niche breadth was greater in the same or similar environment requirements, which between species with broad and narrow niche breadth was smaller.