Figure 6From: Methods of modelling relative growth rate Stand volume (A), top height (B), and quadratic mean stem diameter (C) development over time of the British Douglas fir ( Pseudotsuga menziesii (Mirb.) Franco) yield class model for yield class 24, initial spacing 1.7 m × 1.7 m and crown thinning (Edwards and Christie 1981 ). Back to article page