The phrase "average stem diameter" is correct and usable in written English.
It can be used in contexts related to botany, forestry, or any field that involves measuring plant characteristics.
Example: "The study measured the average stem diameter of the trees in the forest to assess their growth rates."
Alternatives: "mean stem diameter" or "typical stem diameter".
Figure 3 Average monthly incremental stem diameter growth (a) and height growth (b) for the well-watered (solid red line), early-season drought (long blue dash), late-season drought (short green dash) and summer drought (black dash-dot-dot) treatments.
After 1 month under pre-treatment conditions, the average stem height and diameter at the root collar were 9.9 cm (±0.87) and 2.6 mm (±0.09), respectively.
Stem diameter was measured as average taken at three points—slightly above the root collar, apex and median with a calliper.
All implants had the same press-fit femoral stem length of 100 mm (with or without offset), with stem diameter ranging from 15 to 24 mm (average 18.5 mm).
Significant differences between populations were found in plant height, main stem diameter, beginning of canopy, leaf area, leaf average and maximum width, stems and roots dry weights.
Juvenile stem diameter growth and early yield were significantly associated with average yield.
For a 30° oblique angle at 11.3 m s−1 average cutting speed, the cutting energy varied from 4.5 to 15 J as the energycane stem diameter varied from 11 to 17 mm.
In taper models for New Zealand radiata pine (Pinus radiata D.Don), use of upper stem diameters was first demonstrated by Gordon and Budianto (1999) who developed a polynomial taper model that included an upper stem diameter, measured at 6 m above the ground (approximately 16%% of the average height of a mature New Zealand radiata pine tree), as an algebraic constraint predictor.
The stem diameter measurements were used to calculate the mean total stem diameter per plot and mean total stem area per plot.
