坡向对四川冶勒红豆杉种群分布格局的影响——基于斑块信息的分析  

Effects of aspect on distribution pattern of Taxus chinensis population in Yele,Sichuan Province:An analysis based on patches information.

作　　者：胥晓[1] 苏智先[2] 严贤春[1] 

机构地区：[1]西华师范大学生命科学学院,南充637002 [2]绵阳师范学院,绵阳621000

出　　处：《应用生态学报》2005年第6期985-990,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(30370149);四川省重点学科建设资助项目(SZD0420).

摘　　要：在斑块信息的基础上,利用GIS技术分析了坡向对四川冶勒红豆杉种群分布格局的影响.结果表明,冶勒红豆杉种群主要分布在西北向、东北向、东向和北向斑块上,这些斑块在分布面积、平均斑块大小、平均斑块周长以及红豆杉个体的分布数量方面均占绝对优势.红豆杉种群的分布同坡向之间存在极显著的关联性,种群优先分布于北坡、东北坡、西北坡和东坡斑块,其次为西坡和西南坡斑块,最后为平地和东南坡斑块.冶勒红豆杉种群的分布格局绝大多数为聚集分布(除南向斑块外).其中,种群聚集强度最大的是北向斑块,其CE值高达0.906,其次为东北向、西北向斑块,其CE值分别为0.797和0.563,而其余坡向斑块上的CE值均低于0.5.聚集强度CE值与斑块数量、斑块总周长以及斑块上分布的红豆杉个体数呈显著正相关(相关系数分别为0.936、0.735和0.802),而与斑块面积、平均斑块大小、平均斑块周长、平均形状指数无显著相关.Employing GIS method and based on patches information,this paper studied the effects of aspect on the distribution pattern of Taxus chinensis population in Yele,Sichuan Province.The results showed that Taxus chinensis population mainly distributed on the aspects of northwest,northeast,east and north.These aspect patches were absolutely dominant on area,mean size,mean edge and the number of Taxus chinensis.There existed a significant correlation between aspect and Taxus chinensis distribution.Taxus chinensis distributed preferentially on north,northeast,northwest and east patches,then on west and southwest patches,and finally on flat and southeast patches.The distribution patterns of Taxus chinensis in Yele were clustering,except on south aspect patches.The intensity of clustering on north aspect patches was the highest,with the value of Clark-Evans (CE) index being 0.906.The intensity of clustering on northeast and northwest aspect patches was lower than that on north aspect patches,with the CE value 0.797 and 0.563,respectively.The CE values on the rest aspect patches were all not larger than 0.5.There existed a significant positive correlation between the intensity of clustering index,number of patches,total patch edge,and the number of Taxus chinensis distributed on the patches,with the value of correlation coefficient 0.936,0.735 and 0.802,respectively.There were no significant correlations among the intensity of clustering,patch area,mean patch size,mean patch edge,and mean shape index of aspect patches.

关 键 词：冶勒 红豆杉 种群分布格局 坡向斑块 GIS景观指数 

分 类 号：S718.54[农业科学—林学]