The forests of the world supply a significant amount of moisture that
creates rain. A new study published in Global Change Biology reveals how
this important contribution of forests to the hydrologic cycle is often
overlooked in water resource policy, such as that of the EU.
The study, by David Ellison, Martyn Futter and Kevin Bishop at the
Swedish University of Agricultural Sciences (SLU), shows that reducing
forest area reduces regional and continental rainfall. This needs to be
recognized to obtain a fair picture of the forest role in the hydrologic
cycle.
"Are forests good for water? An apparently simple question divides
scientists in two camps -- those who see trees as demanding water and
those who see trees as supplying water," said David Ellison who works in
the Future Forests research program studying resource management. "This
paper demonstrates that the difference between these two camps has to
do with the spatial scale being considered."
From a local perspective, a tree is a consumer of water. But on a
broader regional scale, forests supply the atmosphere with moisture that
will become rainfall. Some dry areas depend almost entirely on rain
that comes from forest-covered areas via the atmosphere.
No comments:
Post a Comment