尤以用带皮材积公式估算去皮材积比用去皮材积公式估计要准确，平均只小2.3%。
For debarked trees, the volume equation for trees with barks was actually more accurate, underestimating volume at average rate of 2.3%.
两种源单株材积随林龄加大，差异增大，但增长百分比随之减少。
The differences in single tree timber volume enhance with the increase of stand ages, but the increasing percentage decrease.
两种源单株材积随林龄加大，差异增大，但增长百分比随之减少。
The differences in single tree timber volume enhance with the increase of stand ages, but the increasing percentage decrease.
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