[mass noun]distribution in zones or regions of definite character 成带;分带;分区,区划 quartz grains can exhibit zonation and rounding. 石英砂具有显示成带和变圆的特性。 ■(Ecology)the distribution of plants or animals into specific zones according to such parameters as altitude or depth, each characterized by its dominant species (生态)(动,植物)种群成带现象;(动,植物)种群分布,分区