Pictures are of sample trees each tree is a little different.
图片都是每样木树是一个有点不同。
In sample plots, sample trees are randomly or systematically selected and growing process is studied by stem analysis.
即在标准地中采用随机或机械抽样方法选取样木，进行树干解析，获得样木生长过程；
The accumulation and distribution rule of productivity and nutrient element were studied by determining the biomass and chemical element in different organs above ground of sample trees.
通过对样地水曲柳天然林的各器官生物量的测定和化学元素分析，研究了生物生产力及营养元素的积累与分布规律。
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