RAINFOR GEM Intensive Plots Manual (pdf) - University of Oxford

A metallic rhizotron as in use at the SAFE plots in Sabah, Malaysia. This is constructed of four 378 mm Metal Framing Corners(MFCs), two 272 mm MFCs, a perspex rectangle 235 mm × 310 mm (or polycarbonate 55 ), 6-9 nuts and bolts and six 15 cm nails withwhich to attach the rhizotron to the soil in the rhizotron pit (not shown).A steel rhizotron (Stephen Adu-Bredu and Akwasi DGyamfi in Bobiri, Ghana) made of a single frame with groove into which theperspex screen slides after installation.- Whichever design is chosen, it is essential to ensure that the visible part of the perspex/polycarbonate screenis exactly A4 size (210 mm × 297 mm).55 n.b. the metallic rhizotron design here deliberately avoids the necessity of drilling boltholes through the transparent screen becausewe had to use perspex (too brittle to allow holes to be drilled) rather than polycarbonate (as used in the wooden design above).45