DENDROLOGY

Detailed explanation-1: -Soil erosion is the washing away of soil by wind or water. The roots of a plant hold the soil firmly. Because of this, soil cannot easily be washed or blown away. So, plants prevent soil erosion.

Detailed explanation-2: -Roots of trees help to prevent (soil erosion) and control the (natural calamities). REASON: Since roots of trees go underneath the soil they hold the soil tightly so that water or wind cannot erode it.

Detailed explanation-3: -Herbs, shrubs and trees in the forests hold the top most layer firmly by their roots. This does not allow natural forces like wind and water to carry away the top most fertile layer of the soil easily. Hence, forests prevent soil erosion.

Detailed explanation-4: -Douglas Fir. Apart from making great Christmas trees, Douglas fir, the state tree of Oregon since 1936, is an excellent option for erosion control. Western Red Cedar. Pacific Crabapple. Red Alder. Shore Pine. Black Hawthorn. Bitter Cherry. 17-Dec-2020