Because pine trees grow in cold, dry places, and in order to reduce the amount of water that evaporates due to excessive surface area, the leaves evolve into thin needles, and the surface of the needles is also covered with a thick layer of wax.

So, the leaves of pine trees are pointed, so that much less water evaporates than other broad-leaved trees, and even if the cold wind howls, it is not easy to blow away the water

Pine tree leaves main features

The most obvious feature of the pine tree is that the leaves are in the form of needles, often 2, 3 or 5 needles in a bundle. For example, the leaves of the oil pine, horsetail pine, yellow mountain pine 2-needle bunch, the leaves of the white pine 3-needle bunch, red pine, Huashan pine, five-needle pine leaves 5-needle bunch.

The life span of the leaves of plants in general is only a few months, and there are some that can live for a year or many years, and the life span of their neutrals' leaves is longer, for example, the leaves of pine trees can live for 3-5 years.

Because of the subplants of the pine and cypress plant leaves are needle-shaped, in shape and structure of the characteristics of arid plants, able to tolerate low and drought, so as to be able to life expectancy.

Extended information:

Throughout the growth of pines, they are extremely drought-resistant, and by their The drought-resistant structure of this type of pine, its leaves are narrow and cuticle is more developed, the surface area and volume of the leaves are relatively small, and stomata usually appear to be sunken.

However, in terms of tissue development is relatively ideal, standing in the physiological point of view, cold and drought tolerance is very strong, so it will not be affected by the lack of water and damage.

And from an ecological point of view, the pine tree is one of the most common arid plants, even in areas where climatic conditions vary greatly, the pine tree can also survive healthily".

The vast majority of pines grow in arid conditions and thin soil areas, where two-needle pines are more drought-resistant than five-needle pines. This shows that if the water content in the soil is too high, it will seriously affect the normal growth of pine trees.

Baidu Encyclopedia - Pine (Pinaceae)