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在森林环境中,立木的形式,它的生产力和质量受到气候、土壤、地形、地质构造等因素的影响,同时也与树种的生物学特性、树种与周围环境条件之间复杂的相互关系有关,此外,还受到人的因素和经济因素制约。在评价某种乔木树种时,仅仅根据1～2个指标(比如直径和树高)已经不够了,在林木选种、良种繁育、引种和造林中除采用上述指标外,还广泛采用树木地上部分和
In the forest environment, the form of standing wood, its productivity and quality are affected by such factors as climate, soil, topography, geological structure and other factors as well as the complicated interrelationship between the biological characteristics of tree species and tree species and the surrounding environment. In addition, it is also subject to human and economic constraints. In evaluating a tree species, only 1 to 2 indicators (such as diameter and height) are not enough, in the forest tree selection, breeding, introduction and afforestation in addition to using the above indicators, the tree is also widely used in aerial parts with