The size structure of trees in crowded, even-aged Abies (fir) stands of 'Shimagare' or 'wave-regenerated' sub-alpine forests is analyzed. Tree-height distributions show consistently smaller variation ...

But, as the radius increases, the resistance drops. For small trees, both the radius and the length increase with height, so the flow resistance may drop as the tree grows.

Forests protect against avalanches, but not every forest is equally effective. Thanks to almost 50 years of observations at ...

Six non-linear growth functions were fitted to tree height-diameter data of ten conifer species collected in the inland Northwest of the United States. The data sets represented a wide range of tree ...

Take a pencil and move several meters away from the tree. Outstretch your arm and hold the pencil so that you can measure the height of the tree on the pencil with your thumb.