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对绵阳市官司河流域１１个长江防护林模式径流场植被类型作了高度级个体数、盖度、种数结构统计；并提出了以高度级（年龄级或相对年龄级）为参考坐标，衡量种群及群落结构动态的失稳率，群落垂直空间盖度分布的均匀度种类的分享度等指标和公式；应用这些指标和公式对系列模式径流场植被类型的高度级结构动态，作了定量分析评价。
The vegetation types of eleven Yangtze River shelterbelt runoffs in the Guansi River watershed in Mianyang City were analyzed with the statistics of the individual numbers, coverage and species structure of the elevations in the Yangtze River Shelterbelt. A high-grade (age-grade or relative-age-grade) The dynamic instability rate of community structure and the sharing degree of the evenness degree distribution of vertical space cover in the community were analyzed and quantified by using these indexes and formulas. .