摘要
在红松阔叶人工天然混交林中,红松胸径与冠幅的关系可用函数ω=a+bD来拟合,相关紧密,且在不同林分类型内存在一致性;其他阔叶树种胸径与冠幅的关系同样可用ω=a+bD拟合,相关系数均在0.96以上。建立了各树种胸径、冠幅关系的数学模型。利用这些数学模型即可根据胸径估算冠幅,并结合郁闭度公式P= niwi/s确定出是否对林分采取抚育间伐措施。确定间伐后,即可按公式N=P×104W·B计算各树种的间伐保留株数,从而,为科学经营红松阔叶人工天然混交林提供依据。
In artificial and natural forests mixed by Korean pine and broadleaved trees,the relation between breast diameter and crown width can be fit with formula ω=a+bD;The relation between breast diameter and crown width of broadleaved can also be fit with formula ω=a+bD,and the correlation coefficient is above 0.96.So can be built math models for relation between bD and CW of different species.Using these formulas can be estimated crown width,With crown density formula P=niwi/s were determined measures for intermediate cutting.By means of formula N=P×10W·B can be evaluated pland numbers to be reserved.
出处
《防护林科技》
2003年第4期19-20,34,共3页
Protection Forest Science and Technology
关键词
红松阔叶人工天然混交林
胸径
冠幅
相关分析
抚育间伐
Korean pine
broadleaved tree
mixed forest
breast diameter
crown width
correlation analysis
tending and intermidiate cutting
