Leaf fall is a unique phenomenon in the life of trees and shrubs. In order to answer the question of when and when leaf fall begins at a mountain ash, birch, aspen, maple or any other plant, several factors must be taken into account. The region of growing trees and shrubs, the type of plant community, the weather conditions of a particular season and some other features are very important. Leaf fall plays an important role not only in the life of specific plant species, but also in nature.
The value of leaf fall in nature
Thanks to it, trees and shrubs regulate the evaporation process and the level of moisture consumption. In the cold season, the root system cannot absorb from the soil that amount of fluid that would ensure proper nutrition of the plants. To avoid death in the winter, trees are forced to get rid of leaves. Since it is this part of the plants that requires the greatest amount of water.
On the branches freed from leaves, in the winter there will not be much snow accumulating. Under its weight, the branches and trunk will not suffer. Fallen
leaves of trees and shrubs, dead parts of herbaceous plants are important elements in the process of soil formation. During
photosynthesis, a large amount of toxic substances accumulate in the leaf plates of plants. Exemption from elements harmful to growth and development occurs when leaves fall.
In mountain ash, birch, aspen, spruce, pine and any other plant, this phenomenon occurs in its own way. Phenological observations provide enormous material for the study of deciduous phenomena.
When does autumn come in the life of a plant?
As you know, a year is divided into four seasons. According to the calendar for autumn, the period from September 1 to November 30 is allocated. I must say that the division is arbitrary, and in the life of animate and inanimate nature, these terms are never kept.
This happens for the reason that shift periods for each type are set separately. For example, when leaf fall near the mountain ash ends and it prepares for survival conditions in the winter, all
annual plants by this time have already completed their growth cycle, and have not survived the calendar autumn.
Signs of autumn in nature
The onset of autumn is marked by certain signs. They can be seen both in living and inanimate nature.
Reducing the length of the day and lowering the average daily air temperature is one of the main indicators that affect the life of wildlife. Air temperature from plus 15 degrees with a gradual decrease to zero refers to the autumn period. It is with these indicators that changes begin to occur in the life of most plants. So the
duration of daylight hours and the average daily temperature regime indicate when leaf fall begins in mountain ash, birch, oak, aspen and other deciduous plants.
Omens
On the basis of centuries-old observations of nature, which are conducted by people, signs are compiled. According to them, you can predict the nature of the upcoming season, the number of crops of vegetables, fruits, crops. I must say that the reliability of many signs is very high, and today scientists can explain and justify their essence. When leaf fall near the mountain ash ends, bright red berries are very noticeable on its branches. One of the signs says that a rich harvest of mountain ash - to a harsh winter. But this same fact also indicates that when the tree bloomed, the weather was fine, and the bees did not hinder pollinating its flowers.
It is generally accepted that when leaf fall at the mountain ash and lilac ends, the pre-winter period begins. A few days remain before winter.