Forest trunk stem flow collecting device and operation method thereof

The invention provides a forest trunk stem flow collection device and an operation method thereof, and belongs to a stem flow measurement technology. The device comprises an interception assembly, a flow guide pipe and a collecting device, and the interception assembly is of a split structure and comprises an upper groove body and a lower groove body which are arranged up and down; the upper groove body and the lower groove body are detachably connected to a tree trunk; the upper groove body and the lower groove body are arranged in a staggered mode, and the upper groove body and the lower groove body are jointly matched to surround a tree trunk, and a complete circumferential interception space is formed after the upper groove body and the lower groove body are surrounded. Stem flow intercepted by the upper groove body can flow into the lower groove body; a plurality of shores are positioned and connected between the upper groove body and the trunk along the circumferential direction of the trunk; a filter p