Invasive Species


Building Quadrat Frames
Quadrat frames can be used with the Plot Sampling Protocol.



  1. You can build a square quadrat frame out of PVC tubing or meter sticks. One method involves fastening sections of PVC tubing using elbows. To make the quadrat frame easier to slide under vegetation, you can construct the two halves separately using PVC tubing and sleeves. Another method used to construct quadrats is tying 1 m long pieces of string between both ends of two meter sticks. This method is best for short vegetation as the strings may get caught on taller plants.
  2. Make sure that your quadrat can be taken apart or folded up for carrying. It is best to leave one corner of the quadrat unattached so you can unfold the quadrat and slide it under the vegetation into place. If all four sides are fixed, you must place the quadrat over the vegetation, which can be difficult with tall plants such as purple loosestrife.



Copyright 2009 Environmental Inquiry, Cornell University and Penn State University