Table 6 Mean basic density at breast height and mean basic density of growth sheaths for given groups of rings (counted from bark), and the sheath/breast height (BH) density ratio for eight Douglas-fir stands in New Zealand
From: Predicting wood density of growth increments of Douglas-fir stands in New Zealand
Site and stand age of biomass trees (N is sample size) | Rings from bark | Mean ring from pith | Sheath density | BH density | Sheath/BH density ratio |
|---|---|---|---|---|---|
Forest Creek age 9 years (N = 8) | 1–3 | 6 | 373 | 350 | 1.068 |
4–8 | 3 | 401 | 415 | 0.960 | |
Forest Creek age 19 years (N = 8) | 1–5 | 14 | 370 | 373 | 0.999 |
6–10 | 9 | 356 | 349 | 1.026 | |
11–17 | 4 | 418 | 419 | 0.993 | |
Gowan Hill age 10 years (N = 8) | 1–2 | 7 | 370 | 344 | 1.082 |
3–4 | 5 | 355 | 330 | 1.078 | |
5–6 | 3 | 403 | 370 | 1.093 | |
7–10 | 1 | 408 | 400 | 1.020 | |
Kaingaroa age 21 years (N = 10) | 1–5 | 16 | 399 | 442 | 0.906 |
6–10 | 11 | 362 | 367 | 0.988 | |
11–17 | 6 | 366 | 374 | 0.983 | |
Kaingaroa age 28 years (N = 8) | 1–5 | 24 | 472 | 488 | 0.969 |
6–10 | 19 | 445 | 456 | 0.976 | |
11–15 | 14 | 463 | 463 | 1.004 | |
16–20 | 9 | 411 | 399 | 1.033 | |
21–30 | 4 | 450 | 439 | 1.036 | |
Whakarewarewa age 31 years (N = 8) | 1–5 | 27 | 453 | 485 | 0.938 |
6–10 | 22 | 413 | 436 | 0.950 | |
11–15 | 17 | 417 | 444 | 0.939 | |
16–20 | 12 | 398 | 398 | 1.002 | |
21–25 | 7 | 430 | 397 | 1.081 | |
26–30 | 2 | 460 | 423 | 1.087 | |
Waiotapu age 33 years (N = 11) | 1–10 | 26 | 383 | 403 | 0.950 |
Waimahia age 59 years (N = 14) | 1–20 | 47 | 434 | 469 | 0.925 |