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中文摘要：
以北京西山油松（Pinus tabulaeformis）、侧柏（Platycladus orientalis）2个主要造林树种为研究对象，探讨了树冠体积、表面积和树冠生产效率3个树冠复合指标的预测模型并对林分健康性进行了定量化评价，结果表明：3个树冠复合指标与其它6个树冠绝对指标都显著相关；3个树冠复合指标在单木水平和林分水平上与胸径和林分平均断面积之间呈显著的线性回归关系。应用这3个树冠复合指标对林分健康定量化的评价结果表明，当林分平均树冠体积〉1．08m^3或林分平均树冠表面积〉7．22m^2或林分平均树冠生产效率〉1．33m时，该林分的树冠发育正常，没有受到使其生长力明显减弱的干扰和胁迫。
英文摘要：
Forecast models of crown volume, crown surface area, crown production efficiency were discussed and quantitative appraisal of forest health was made＇by taking Pinus tabulaeformis and Platycladus orientalis plantations as study objects. Result showed that these three crown composite indices had significant relationships with other six crown absolute indices, including tree height, diameter at breast height, crown length, crown ratio, average crown width, crown density, and crown light exposure. Highly linear regression correlations were found between the crown composite indices and diameter at breast height and stand average basal area in individual level and stand level. Quantitative appraisal result of forest health by the crown composite indices indicates that crown growth of a stand is normal when stand average crown volume is more than 1.08 m^3 or crown surface area is higher than 7.22 m^2 or crown production efficiency exceeds 1. 33 m, exhibiting no obvious disturbance and stress on the stand.
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