Sap flow
![Sap flow meter on a young beech tree Sap flow meter on a young beech tree](/media/_processed_/d/4/csm_saftfluss_f58e6d9b90.jpg)
© Thünen-Institut Wo/Öko
Sap flow sensors installed on the trunk show us how trees use the water they absorb. We have equipped trees with special measuring devices for this purpose. Follow this link and visit a tree. You can follow the shrinking and swelling movements caused by water transport. This allows us to gather information on how trees react to extreme drought, very high temperatures or rainfall events.
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