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New allometric models for estimating the UK-grown S. giganteum volume—model form, parameters and model fit properties in each case. H, DBH and DBH are as defined above.
| model | form | a | b | m | c | RMSE (Mg) | r 2 |
|---|---|---|---|---|---|---|---|
| DBH and H | a(DBH2H) b | 0.374 | 0.697 | 1.016 | −0.168 | 1.261 | 0.937 |
| DTB and H | a(DTB2H) b | 0.423 | 0.750 | 1.011 | −0.114 | 1.298 | 0.933 |
| DBH only | aDBHb | 3.542 | 1.956 | 1.009 | −0.099 | 1.282 | 0.935 |
| H only | aHb | 0.021 | 1.663 | 1.049 | −0.458 | 2.897 | 0.665 |
