Friday, February 5, 2010

IS it really true that roots stop absorbing water from the ground during winter in northern hemisphere?

what proof is there for this??





Thanks for your answers!





IS it really true that roots stop absorbing water from the ground during winter in northern hemisphere?
Transpiration doesn't happen if it is cold and there is no sunlight.





Roots might grow a bit but not a lot, and there is little water uptake.IS it really true that roots stop absorbing water from the ground during winter in northern hemisphere?
Sap is indeed water, it's basically the product of photosynthesis, which is what the tree ';eats';, so to speak. It's the nutrition it needs to grow. And yes, they keep growing even in the winter, they don't stop absorbing water. But sap is more than just water, it's combined with several other things that the tree makes, and the tree cells chloroplasts will make nutrition.


Although they might grow a little slower during the winter as the sap and water the trees will need to absorb might start to freeze, which is why many small plants die during the first frost (example: peach trees must be warmed during the frost or the peaches will die, flowers will wither, etc.) but the bigger the plant, the bigger the chances it will survive.
A large part of a tree's body is found above ground (the branches and the trunk). These parts need to withstand the cold winter air. In winter water freezes to ice. The trees cannot absorb water, therefore, transpiration becomes impossible. Trees can be divided into two groups: deciduous trees, which lose all their leaves in autumn and evergreens, which maintain leaves on their branches throughout the year.





Evergreen trees, such as holly, usually have leaves which are covered in a thick layer of wax to stop them losing too much water. Conifers, such as pine trees, are evergreens which have long narrow leaves. This shape of leaf also helps to reduce water loss.....
Well, the water is probably froze, so they can't suck up ice, can they?

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