中等密度的白桦林有着最高的年蓄积生长量。
The highest annual volume growth is found in stands of middle density of stocking.
结果表明：采伐强度与林分年平均蓄积生长量和更新株数间呈抛物线关系。
Results showed that the relation equations was parabola equation between cutting intensities and annual average increment and annual average number of regeneration individuals of stands.
通过对各土类农田防护林林分蓄积生长量和土壤生产力的综合分析，把河西走廊立地级划分为四类。
Site level in Hexi-corridor area was divided into 4 types by comprehensive analyzing the growing stock of stand and soil productivity of all kinds of farmland shelterbelt.
林龄单因变量的蓄积量生长模型决定系数低，引入地位指数和密度指数再次参数化的生长模型可显著提高模型拟合度。
Single age variable stock volume growth model had low coefficient of determination, but it was improved a lot by introducing site index and stand density index in reparameterization.
通过模型的外检验，蓄积平均精度可达90%以上，林分纯生长量的估计精度可达80%以上。
Through the model external-test, the average precision of volume model was over 90% and the estimation precision of stand net growth was over 80%.
另外，对杉木不同初植密度下林分断面积、蓄积和生物量的生长过程进行了分析和模型拟合。
In addition, the paper analyzed and simulated growth process of stand basal area, volume and biomass under different initial planting density for Cunninghamia lanceolate, plantation.
但蓄积量大幅下降，林分的龄组、密度结构严重失调，林分生长量偏低。
But stand volume descents to a great extent, age class and stand density structure are maladjusted badly, and the number of stand growth is low.
但蓄积量大幅下降，林分的龄组、密度结构严重失调，林分生长量偏低。
But stand volume descents to a great extent, age class and stand density structure are maladjusted badly, and the number of stand growth is low.
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