Reverberation time in forests is measured as T30 decay using Schroeder buildup curves.

Evidence

Reverberation times, defined in this case as a T30 (time required for the signal to decay by 30 dB), are calculated using the nonlinear regression approach found in Xiang (1995). In this approach, a normalized decay curve is extracted from the data in terms of sound buildup (Schroeder, 1966). — Donald G. Albert, Michelle E. Swearingen, Frank E. Perron, and David L. Carbee, Low Frequency Acoustic Pulse…, 86

Categorization

• DEFINE: Clarifies that T30 means the time for a 30 dB decay of the signal, not the full T60 used in architectural acoustics.
• XREF: Connects to architectural acoustics reverberation theory (Sabine, Schroeder) applied here to a wild outdoor setting.