摘要
利用计盒维数和信息维数两种分形方法分析了黄河三角洲湿地柽柳种群的空间分布特征及其随水深梯度的变化。结果表明,不同水深梯度下柽柳种群分布格局的计盒维数均较大,随着水深的增大而逐渐减小,但变化幅度较小,反映了不同水深梯度下柽柳种群对水平空间的占据程度较大;信息维数总体上随水深的增大而减小,在水深低于-1.55 m范围内,信息维数较大,柽柳种群的微观结构较为复杂,格局强度较高,水深高于-1.55 m时,信息维数较小,柽柳种群的微观结构较为简单,格局强度较弱。水深-1.55 m可能是黄河三角洲湿地柽柳种群分布格局的一个阈值。
The distribution patterns of Tarnarix chinensis population under the environmental gradient of dif- ferent water table depth were analyzed using two fractal analysis methods-box dimension and information dimension. The box dimension changed little with different water table depths and kept a high dimension, which means that Tamarix chinensis population may keep a high spatial possessive degree for different water table depth. However, the information dimension in general decreased with the decline of water table depth. When water table depth was below --1.55 m, the information dimension was large, indicating that in this section of water table depth gradient, the micro-structure of Tarnarix chinensis population was much com- plex and the pattern intensity was high. When water table depth was above --1.55 m, the information di- mension was generally very small, indicating that the micro-structure of Tamarix chinensis population was very simple and the pattern intensity was low. The water table depth of --1.55 m may be a threshold of the distribution patterns of Tamarix chinensis in wetlands of the Yellow River Delta.
出处
《水土保持通报》
CSCD
北大核心
2008年第5期70-73,共4页
Bulletin of Soil and Water Conservation
基金
国家重点基础研究发展计划(973)项目(2006CB403303)
国家自然科学基金项目(40571149)
关键词
柽柳
分布格局
计盒维数
信息维数
湿地
黄河三角洲
Tamarix chinensis
distribution pattern
box dimension
information dimension
wetlands
Yellow River Delta