冠長率
冠長率是是指樹冠的長度與樹木總高度的百分比。
冠長率是衡量樹冠大小的數量指標,同時又是影響樹木生長的重要因素。研究結果表明,冠長率與樹木直徑、材積相關關係非常緊密,其相關指數均達 0 .9以上,並且冠長率對樹木下部直徑的影響要大於對上部直徑的影響。
The rate of crown length is a quantity index for weighing the size of a tree crown, meanwhile,it is a important factor to affct the the growth of a tree. The study result indicates that the rate of crown length has a very compact correlativity to the diameter and volume of a tree, the correlation indices all above 0.9; besides, the rate of crown length has bigger affect on lower diameter than upside diameter.
