Combined grassland survey quadrat frame and using method thereof

The invention discloses a combined grassland survey quadrat frame, and belongs to the field of sample collection. The combined grassland survey quadrat frame comprises a plurality of circular tubes, and connecting pieces arranged among the plurality of circular tubes, and a first connecting pipe and a second connecting pipe are respectively arranged at the end parts of two adjacent circular pipes;the first connecting pipe is rotationally connected with the second connecting pipe; a threaded baffle ring is arranged in the middle of the first connecting pipe; one end of the outer wall of the first connecting pipe is movably sleeved with a limiting sleeve; and a spring is arranged between the limiting sleeve and the first connecting pipe. According to the invention, the connecting pieces andthe circular tubes are mutually combined to assemble quadrat frames with different sizes, the working requirements of workers are met, the workers can conveniently transport the combined storage rackafter disassembly in a com