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%.

youdao

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.

youdao