In this picture we can see the middle zone of the forest of Irati.Greens are losing every day, and give way to the yellow first, and then red and gold, which are most prevalent now.Why there is this color change?
Green indicate the presence of chlorophyll , where the plant is fed with normal light conditions.When it is decreasing, the green chlorophyll is replaced by the yellow xanthophylls, which are activated with a shorter wavelength, and that can continue making photosynthesis more time, before being replaced by the carotenes, which are what give red in nature.When the amount of light continues to decline, even carotenes serve them to make photosynthesis, and finally they fall.If you want to know more Try these links:
|Arrazola( Irati forest,Aezkoa)10 october2012|
There are other factors such as protection against the cold, so in warmer areas are larger leaves to evaporate more water while in the colder, the leaves surface are reduced like simple needles, as in the Siberian taiga.
|We can see the silver ballon hanging from a branch.|