Why do trees lose their leaves? What are the reasons why trees lose their leaves?

Poor ventilation, insufficient nutrients in the tree, excessive fertilization. 1. In the process of cultivating plants, if the windows are not opened for a long time, resulting in poor ventilation of the breeding environment, the plants will not be able to breathe normally, which will affect the growth and cause the phenomenon of falling leaves. Workaround:

Move the plants to a well-ventilated place, and open the windows frequently to let in the air.

2. The tree has different requirements for the content of nutrients in different growth periods, and if the nutrients are not added in time according to the growth needs of the tree, it will cause the tree to have insufficient nutrients and lose leaves.

3. In the growth period of plants, there is a specific demand for fertilizer, if you blindly apply thick fertilizer to it, it will produce fertilizer damage, affect the normal growth of plants, and in serious cases, it will lead to rot of the root system of the plant, and the leaves will turn yellow and fall off.

It's because of a substance called abscisic acid. The main use of green leaves is to absorb sunlight for photosynthesis to make nutrients, as well as to transpirate water. Transpiration of water keeps trees from burning in blazing sunlight.

Usually the higher the temperature, the more water transpirates from the tree. In autumn and winter, when rain is scarce and the air is dry, the moisture content of the soil also decreases, which cannot meet the needs of tree growth. Coupled with the fact that the sunlight is oblique in the northern hemisphere, the number of hours of daylight is shortening day by day, which indicates that winter is approaching for trees.

At this time, a hormone is produced in the leaves of the tree, abscisic acid. When the abscisic acid in the leaf is transported to the base of the petiole, a layer of very small parenchyma cells with a thin cell wall is formed at the base of the petiole (scientists call this parenchyma cell a delamination), which makes it impossible to transport water to the leaf normally. Under the action of abscisic acid, a natural fracture surface is formed around the separation layer.

Due to the lack of normal replenishment of water, the leaves will gradually dry up, and the natural fracture surface will become more and more obvious, and when the autumn wind blows, the leaves will fall one after another, and even if there is no wind, they will automatically fall scattered. Autumn leaf loss reduces water transpiration and nutrient consumption, allowing trees to survive the cold and dry winters.

Trees shed leaves for normal metabolism. Leaf litter can reduce water loss and nutrient consumption. By dropping the leaves, you can also ** part of the nutrients (the leaves turn yellow before falling, and the nutrients will be transferred to the branches).

If we transplant trees in the middle of summer, we usually have to remove most of the leaves in order to reduce water loss and prevent excessive water loss and plant death before new roots grow.

Because the tree is "old," the metabolism is not there, the chlorophyll of the leaves disappears, etc.

The main thing is the self-protection of the tree, before the winter in order to reduce the consumption of water and nutrients, the tree terminates the life of the leaves, and let it fall down! Next year, it will grow new leaves and complete its historic mission.

There are many reasons why trees shed their leaves, here are some of the most common ones:

The Natural Growth Cycle Bench says: Some trees will naturally drop their leaves during the growth cycle of the year.

Climatic influences: Climatic factors such as cold, dryness, and wind-blown sand may also cause trees to lose their leaves.

Water shortage: When trees run out of water, leaves may fall off.

Nutrient insufficiency: Trees lack essential nutrients, such as nitrogen, pure phosphorus, potassium, etc., which may lead to leaf loss or drop.

Diseases: Viruses, fungi, insects, etc. can cause trees to lose their leaves.

Growth pressure: Excessive bending, pruning, pruning, etc., can cause trees to lose leaves.

Other factors such as roadside environmental pollution, roadside noise, magnetic fields of power lines, etc. may also cause trees to lose leaves.

In general, if a tree is found to be losing leaves, the cause should be examined in detail and appropriate measures should be taken to promote healthy growth.

Yes, it is called Tianzhu and will not lose leaves four times a year.

I discovered the scientific problems around me and found the relevant theoretical knowledge.

1. Why do some trees lose their leaves in winter, leaving only branches?

Because the leaves of deciduous tree species are not able to carry out normal photosynthesis due to the low temperature, the leaves should be shed in autumn to avoid consuming too many nutrients. The other is that the leaves can live for two to many years, mostly in spring and summer, after the new leaves germinate, the old leaves fall off in the last plant, as far as the whole tree is concerned, it is evergreen all year round, called evergreen plants, such as pines and cypresses.

Leaf shedding reduces water loss, and late autumn or dry season leaf shedding can be seen as an adaptation of plants to avoid excessive transpiration. The leaves of the pine tree are needle-like, also known as pine needles, which reduce the transpiration area, and the epidermis is thick and the cuticle is developed, and these structures can reduce transpiration and adapt to arid environments, so they are evergreen all year round.

2. Why does a rainbow appear when oil is poured into water?

Because the density of oil is smaller than that of water, it floats on the surface of the water, forming a film of oil, and the refraction of light by this film causes a colorful rainbow halo, similar to the photolysis experiments caused by refracting light with a prism.

3. Why are the days short and the nights long in winter? And the opposite is true in summer?

Because in summer, the sun mainly shines on the northern hemisphere, and the area of the sun in the northern hemisphere is large, and the days are long, and in winter, the sun mainly shines on the southern hemisphere, and the southern hemisphere shines on the area less, and the days are short.

4. Why does it snow in winter?

Because the temperature is quite low in winter, the temperature on the ground is also below freezing, so the temperature of Paga touching the clouds in the sky is even lower. The water vapor in the clouds can directly condense into small Xiaoice crystals and small snowflakes, and when these snowflakes increase to a considerable extent, the air flow will not be able to drag it, and it will fall from the clouds to the ground, which is snow.

5. Why can't I drink expired water?

Because the water is stored for a long time, it will produce nitrite by itself, although the content is relatively low, but it will cause great harm to the human body for a long time, which is why it is not recommended to drink overnight water. Because the mineral water is relatively clean and well sealed, it deteriorates slowly, but it does not deteriorate and will cause greater harm, so it is better not to drink expired mineral water.

There are poor ventilation, insufficient tree nutrition, excessive fertilization, pests and diseases, excessive temperature, excessive watering, insufficient light, senescence of leaves, soil problems, physiological disorders.

In the process of cultivating plants, if the window is not opened for a long time, the breeding environment will be poorly ventilated, which will make the plants unable to breathe normally, which will affect the growth and cause the phenomenon of falling leaves. Move the plants to a well-ventilated place, and open the windows frequently to let in the air.

If the nutrients are not added in time according to the growth needs of the land cavity and the tree, it will cause the tree to have insufficient nutrients and lose leaves. Add nutrients to the tree in time to avoid leaf loss caused by malnutrition of the tree.