Why don t roadside pine trees bear pine nuts?

Because the pine trees on the roadside are not pine nut-bearing species, the pine trees on the roadside are mainly Pinus tabuliformis.

Pinus tabuliformis is a positive tree species, deep-rooted, light-loving, barren-resistant, wind-resistant, and can grow on acidic, neutral or calcareous loess with deep soil layers and good drainage, and temperatures of -25. The heartwood is light yellow-reddish-brown, the sapwood is light yellowish-white, the texture is straight, the structure is fine, the material is hard, and it is durable.

Pinus tabuliformis can be used in construction, electric poles, pillars, shipbuilding, appliances, furniture and wood fiber industries. It is endemic to China and is produced in the northeast, central plains, northwest and southwest provinces and regions.

The ornamental value of Pinus tabuliformis

Pinus tabuliformis can be mixed with fast-growing trees on the roadside, and its advantages are: the main trunk of Pinus tabuliformis is straight, the branches are curved and colorful, and the willow is willow.

Make it the background, the canopy.

The levels are different, the tree colors are varied, and the street scenery is rich.

However, there are disadvantages that the soil is easy to compact; Some Pinus tabuliformis planted sidewalks.

Fast-growing trees are planted on the side of the roadway on the inside or in the sub-lane. In this way, the soil is protected from damage and trampling by vehicles and people, which is beneficial to the growth of Pinus tabuliformis.

The pine trees on the roadside are varieties that do not bear pine nuts. Pinus, (scientific name: pinus):

It is a plant of the family Pinaceae and Pinus. There are more than 80 kinds of pine trees in the world, and the pine trees are mainly divided into Masson pine, Pinus tabuliformis, whitebark pine, podocarpus, Huashan pine, Dabie Mountain five-needle pine, Korean pine, red pine, black pine, Huangshan pine, Yunnan pine, golden pine, sylvestris pine, cedar and so on.

Morphological characteristicsWhen the pine trees are young, the crown is pyramid-shaped, and the branches are mostly in the shape of a wheel. After the seedlings are unearthed and the cotyledons are born, the first ones are primary leaves, solitary, spirally arranged, linear-lanceolate, and the leaf margins are toothed.

It takes 1 3 years for the primary leaves to function as leaves, and needles appear, usually in bundles, at the tips of short branches. Each bundle of needles has leaf sheaths at the base, which fall off or remain in the early stages. The position of the resin tract in the mesophyll tissue is relatively constant in adult plants, and can be divided into three types: exophytic, mesophytic and endophytic.

Pine trees bear pine nuts, but not all pine trees can bear edible pine nuts, there are many kinds of pine trees, such as Korean pine, masson pine, Huashan pine, Chinese pine, whitebark pine, sylvestris pine, etc. Different species of pine trees will have pine nuts, and the seeds of pine trees are divided into two categories according to their morphology:

In the first category, the seeds are large, plump and heavy, and they are spread by small animals such as squirrels, which are suitable for human consumption;

In the second category, the seeds are small and light, with a brown membranous wing, which spreads the seeds by the wind on dry sunny days, and is not suitable for human consumption.

Most of the pine nuts we eat are the fruits of red pine, and although there are pine nuts in Huashan pine and whitebark pine, the pine nuts are obviously small and not suitable for eating. Korean pine has strong photophilicity, high requirements for soil moisture, and should not be too dry, too wet soil and severe cold climate. In the cold and rainy, relative humidity.

Grows best in higher climates with deep, fertile, well-drained, acidic brown forest soils. Korean pine is found in the Changbai Mountains, Jilin Mountains and Xiaoxing'an Mountains in northeast China.

The south of Aihui is 150-1800 meters above sea level, with a cold, humid climate and brown forest land zone. The southern climate is hot, which is obviously not suitable for the growth of Korean pine.

Due to geological and climatic factors, there are few species of pine trees, and the pine nuts produced by pine trees in the south are basically small, light, and membranous wings, which are not suitable for consumption.

3. How often do pine trees bear pine nuts?

According to the data, some pine trees set fruit early, and a small amount of fruit can be set in 5 or 6 years, and significantly increase in 15 20 years (Masson pine, Pinus tabuliformis, Yunnan pine, etc.); Some of them set fruit very late, such as Korean pine, which does not begin to set fruit until 80 140 years under natural forest conditions (but under plantation conditions, it has begun to set fruit in 15 20 years). Most pine trees are spaced and harvested every 2 to 3 years or more.

Generally, after 10 years, it enters the "middle-aged forest".

Because the pine trees on the roadside are not pine nut species, mainly Pinus tabuliformis. Pinus tabuliformis is a coniferous evergreen tree of the Pinaceae family, up to 25 meters tall and up to 1 meter in diameter at breast height. The lower part of the bark is grayish-brown and splits into irregular scales. Large branches are flat or oblique upwards, and old trees have flat tops.

Pinus tabuliformis is a positive tree species, deep-rooted, light-loving, barren-resistant, wind-resistant, and can grow on acidic, neutral or calcareous loess with deep soil layers and good drainage, and temperatures of -25.

Pinus tabuliformis can be used for construction, electric poles, pillars, shipbuilding, appliances, furniture and wood fiber industry, and is endemic to China, producing in the northeast, central plains, northwest and southwest provinces and regions.

Pinus tabuliformis is oblate and segmental or irregularly flakes of cherry blossom or shape, short and thick and thin. Yellowish-brown, grayish-brown or reddish-brown surface, slightly rough, sometimes with brown to black-brown grease spots, or residual cork.

The pine trees on the roadside do not bear pine nuts because the variety of pine trees on the roadside is Pinus tabuliformis, which is a variety that only bears pine towers and does not bear pine nuts. The pine trees that bear pine nuts are common Korean pine, masson pine, Huashan pine, etc., and these pine trees can produce huge pine nuts more than 1 cm long. Pine nuts are the seeds of plants such as Korean pine in the pine family, and are one of the common nuts that are rich in fat, protein, carbohydrates, etc.

The pine trees on the roadside do not bear pine nuts because the variety of pine trees that accompany the roadside is Pinus tabuliformis, which is a variety that only bears pine towers and does not bear pine nuts. The common pine trees are Korean pine, masson pine, Huashan pine, etc., which can produce huge pine nuts more than 1 cm long. Pine nuts are the seeds of pine plants such as Hongyoudong pine, which is one of the common nuts and is rich in fat, protein, carbohydrates, etc.