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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.
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