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。
This interface is based on the sample WSDL in Listing 3. As mentioned, all of the input and output types are mapped to SOAPElement trees containing the XML text.
该接口基于清单3中的示例WSDL，其中所有输入和输出类型被映射到包含XML文本的SOAPElement树上。
In this model, a logistic regression function is induced from multiple decision trees, which are built based on different training sample sets respectively.
该模型通过对使用多个样本集分别训练出的多棵决策树预测函数进行逻辑回归来得到最终的预测函数。
As showed the curve regression equations of tree height-age relations matched the sample data nicely and reflected the trees' grown process nicely.
这表明，筛选拟合的树高——年龄导向曲线回归方程很好地拟合了样本资料，很好地反映了树高的生长过程。
Paired sample t test method was used to compare the difference between the two explants of the same trees. Independent sample t test method was used to determine the difference between the two groups.
用成对样本t检验法比较同一无性系内两种外植体的差异用成组样本t检验法比较两组无性系间的差异。
The plus trees selection of Q. variabilis should use the small sample plot method and the standard is different in each region.
栓皮栎优树选择应采用小样地法，各地区选择标准不同。
Dynamic analysis of poplar stem borer was done with population density, crowded level and percentage of damaged trees on sample plots.
本文采用平均虫口密度、拥挤度和被害株率作为标准地的指标，对杨树蛀干害虫的危害状况作动态分析。
Dynamic analysis of poplar stem borer was done with population density, crowded level and percentage of damaged trees on sample plots.
本文采用平均虫口密度、拥挤度和被害株率作为标准地的指标，对杨树蛀干害虫的危害状况作动态分析。
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