An important
component of the water cycle in ecological systems, rainfall interception by
virgin forests was here calculated from gross precipitation minus through fall
and stem flow.
The through
fall measurement system was designed on the basis of a 3 m long trough
mounted beneath the canopy and able to operate successfully under a range of
rainfall conditions.
Stem flow was
measured using spiral collars consisting of a split plastic hose attached to
sampled trees, with gross precipitation measured in an open area via a
tipping-bucket rain gauge.
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