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。
This paper describes a method which has been used for stand population selection and classification based on the plus trees selection principle of a single tree.
本文将林木树种单株选优原则和方法运用到林木群体选择和划分上。
The morphological index when correlated linearly with tree growth in single tree evaluation of plus trees selection is thought to be a basis for increasing accuracy and quality of selected trees.
把对林木生长量有直接关系的形质指标，作为单株评价的一部分，考虑在单株选择之中，作为提高单株选优质量和准确性的根据。
The morphological index when correlated linearly with tree growth in single tree evaluation of plus trees selection is thought to be a basis for increasing accuracy and quality of selected trees.
把对林木生长量有直接关系的形质指标，作为单株评价的一部分，考虑在单株选择之中，作为提高单株选优质量和准确性的根据。
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