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首页> 外文期刊>Journal of Arboriculture >Equations for predicting diameter, height, crown width, and leaf area of San Joaquin Valley street trees.
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Equations for predicting diameter, height, crown width, and leaf area of San Joaquin Valley street trees.

机译：用于预测圣华金山谷行道树的直径，高度，树冠宽度和叶面积的方程式。

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摘要

Although the modelling of energy-use reduction, air pollution uptake, rainfall interception, and microclimate modification associated with urban trees depends on data relating diameter at breast height (dbh), crown height, crown diameter, and leaf area to tree age or dbh, scant information is available for common municipal tree species. In this study, tree height, crown width, crown height, dbh, and leaf area were measured for 12 common street tree species in the San Joaquin Valley city of Modesto,California, USA. The randomly sampled trees were planted from 2 to 89 years ago. Using age or dbh as explanatory variables, parameters such as dbh, tree height, crown width, crown height, and leaf area responses were modelled using two equations. Therewas strong correlation (adjusted R2 > 0.70) for total height, crown diameter, and leaf area with dbh. Correlations for dbh with age and crown height for several species were weaker. The equations for predicting tree sizes and leaf area are presented andapplied to compare size and growth for all species 15 and 30 years after planting. Tree height, crown diameter, and dbh growth rates tended to slow during the second 15 years, but the leaf area growth rate increased for most species. Comparisons of predicted sizes for three species common to Modesto and Santa Monica trees suggest that pruning has a significant impact on tree size and leaf area, potentially more than climate and soil characteristics.
机译：尽管与城市树木相关的减少能源消耗，吸收空气污染，拦截降雨和微气候改变的模型取决于与胸高（dbh），树冠高度，树冠直径和叶片面积与树木年龄或dbh相关的数据，对于普通的市政树种，缺乏可用的信息。在这项研究中，测量了美国加利福尼亚州圣华金河谷市莫德斯托市的12种常见街道树种的树高，树冠宽度，树冠高度，dbh和叶面积。随机取样的树木是在2到89年前种植的。使用年龄或dbh作为解释变量，使用两个方程式对dbh，树高，树冠宽度，树冠高度和叶面积响应等参数进行建模。总高度，树冠直径和叶面积与dbh之间具有很强的相关性（调整R2> 0.70）。几个物种的dbh与年龄和树冠高度的相关性较弱。提出了预测树木大小和叶面积的方程式，并将其应用于种植后15年和30年的所有树种的大小和生长比较。在接下来的15年中，树高，树冠直径和dbh生长速率趋于缓慢，但是大多数物种的叶面积生长速率增加。比较莫德斯托树和圣莫尼卡树的三种常见树种的预测大小，表明修剪对树的大小和叶面积有重大影响，可能比气候和土壤特征更大。

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