Why are coniferous trees do not reset the needles?

Which of the year is not to look at the Christmas tree or other coniferous tree - forest beauties always please the eye with their fluffy green branches, while other trees stand in the winter period completely naked and as if dried. Why are coniferous plants not reset the needles and remain green at any time of the year?

We all know that trees absorb carbon dioxide and produce oxygen. This process is called photosynthesis, and for its flowing plant needs sunlight and water. As you know, in winter and with the other, problems arise: the day is shorter, and all the water in the form of snow lies on the surface. Many trees solve the problem simply: drop the leaves through which the main volume of moisture is evaporated, and waiting for favorable conditions, that is, spring. The coniferous trees nature presented a number of amazing features that allow them to always remain green.

The plant can not affect the presence of sunlight, but can throw all the forces to keep the precious moisture. This is how coniferous trees come. Their leaves that we call needles have a very small surface area, which prevents the evaporation of a large amount of moisture. In addition, conifers better hold moisture due to the thin wax film, which covers their needles leaves. Hold down moisture is quite enough before the onset of spring.

But this does not mean that coniferous trees do not dump the needles at all. For several years, such trees are fully updated their cheva - this is due to the accumulation of various unnecessary substances in needles and the need to update them. However, for the human eye, this process is less noticeable than, let's say, the autumn leaves of large-leaf trees.