Translator Reviews ( English → Japanese )

English

This is particularly true for trees in the middle and upper latitudes, which tend to attain greater heights on ridges, whereas in the tropics the trees reach their greater heights in the valleys. This is because middle- and upper- latitude timberlines are strongly influenced by the duration and depth of the snow cover. As the snow is deeper and lasts longer in the valleys, trees tend to attain greater heights on the ridges, even though they are more exposed to high-velocity winds and poor, thin soils there. In the tropics, the valleys appear to be more favorable because they are less prone to dry out, they have less frost, and they have deeper soils.

Japanese

このことは、特に中・高緯度地域に育つ樹木に当てはまります。中・高緯度地域では山稜に高い樹木が育つ傾向にありますが、熱帯地域では、渓谷に高い樹木が育ちます。これは、中・高緯度地域の樹木限界線が積雪の期間や量によって大きく影響されるからです。たとえ樹木が強い風や肥沃でない薄い地層に曝されても、渓谷での積雪が増え積雪期間が長引くほど、 山稜に育つ樹木は高くなる傾向にあります。それと比べると、熱帯地域では、渓谷が乾燥する傾向が低く、霜が降りることも少なければ地層も深いので条件がよいと言えます。