Scientists in the United States studied the trees growing in the Minamata and highlands and found that the poorer the soil, the more trees need to get nutrients from the leaves. The more likely the leaves will turn red in the fall.
A study conducted by Emily Habbink of the University of North Carolina at Charlotte showed that due to the low nutrient levels in the soil of the Highlands, the leaves of the trees growing there turn red in the fall; and the water-rich areas in the soil in the soil The trees that grow, their leaves remain yellow in autumn.
Scientists already know that the leaves of chlorophyll decomposition usually in the autumn approaching, the leaves of nutrients will be re-assigned to the trunk and roots to help trees to spend scarce winter sun. After the leaves lose chlorophyll, the yellow carotenoids that originally exist will be revealed. This is the reason why the leaves of some trees are yellowed in autumn. The redness of the leaves is mainly caused by anthocyanins, which are usually produced from leaves in the fall. What is the purpose of the trees so much to make the leaves red? Scientists have not been conclusive on this point.
Some scientists believe that pigments such as anthocyanins can act as antioxidants and help trees resist harsh environments. Some scientists believe that these pigments can increase the temperature of the leaves and thus help the trees to resist cold. William Oake, a scientist at Montana State University in the United States, proposed a few years ago that anthocyanins may act like sunscreens to protect trees from falling prematurely in the autumn due to damage from the sun. Get more nutrients from the leaves.
Harbink's new findings support Oak's earlier argument. Ock pointed out that the trees growing on poor soil have higher demand for nutrients and their leaves are more likely to turn red in order not to let them fall prematurely.
The scientists hope that the next step is to analyze satellite data to investigate whether there is a broader correlation between leaf discoloration and soil types.
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