摘要
断面积生长预估是林分生长和收获预估体系中的核心因子和基础。本文选用了包含林分密度指标、年龄和立地质量指标的Ｒｉｃｈａｒｄｓ 模型作为断面积生长模型。利用树冠竞争因子（ ＣＣＦ） 能稳定反映林分竞争水平的特性，建立了ＣＣＦ 与林分密度指数和单位面积林木株数之间的函数关系式，并对长白落叶松和杉木得出：（１） ＣＣＦ＜ ２００ ，林分为等株数生长；（２）２００ ≤ＣＣＦ≤３００ 时，为等株数生长向自然稀疏生长的过渡期，该期间林分密度指数的变化可用等株数生长和自然稀疏生长的线性组合来表达；（３） ＣＣＦ＞ ３００ 时。
The basal growth prediction is a kernel factor and foundation in the model system of stand growth and yield prediction. Richards Growth Model including stand density index, age and site quality index was taken as basal area growth model. The functional relationship was developed between Crown Competition Factor ( CCF ) proposed by Krajicek et al. and stand density index by Reineke and number of trees per hectare by using the characteristic of CCF reflecting tree competition in stand to certain degree. According to the function, the conclusions for L. olgensis and C. lanceolata are as follows; 1) CCF<200 , showing stand growth with constant tree number; 2) 200≤ CCF ≤300, transition of growth from constant tree number to the self thinning, in other words, the change of SDI (stand density index) can be described as linear combination of the growth with constant tree number and the self thinning; (3) CCF>300 , stand growth in the self-thinning.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1999年第6期35-41,共7页
Scientia Silvae Sinicae
基金
国家自然科学基金
