A history of varying methods for determining tree age in Estonia with emphasis on oak

Sander, Heldur

doi:10.2478/fsmu-2020-0002

Figures & Tables

A sandpapered disc of lime outer bark (magnification approximately 15 times). The horizontal discontinuous rows mark the annual increments of the outer bark. Radial channels run through the discontinuation points. The radial channels are almost parallel near the bottom of the outer bark but converge at the top. The point of convergence of the radial channels marks the beginning of the outer bark growth. If the crest (top) of the outer bark is missing, the radial channels do not converge on the image plane (Rohtla, 1998).

An approximately two-fold magnified image of a sandpapered disc of the outer bark of an oak (Rohtla, 1998).

An image of a sandpapered disc of the outer bark of an oak, magnified 30–35 times (Rohtla, 1998).

22 oaks from Tallinn in 1999 the ages of which were determined graphically with a dendro-chronological method; in 17 cases, tree age was determined according to bark (Läänelaid et al_, 2001; Sander et al_, 2008, updated)_ Oaks no_ 3 and 12 had eccentric stems_ Nos_ 1–10 were situated in Kadriorg Park, 11–17 in the city centre and 18–21 on Kopli Peninsula_

Sample No., direction and height in trunk, m	Trunk circumference at 1.3 m, mm	Bark thickness, mm	Trunk radius without bark, mm	Length of raw wood core, mm	% of radius without bark	Number of tree rings in the core	Average annual increment, mm	Age graphically/based on average, years	Age determined using the outer bark method
1 W, 1.3	5200	74	754	324	43	198	1801–1999, 1.6	370/471	290
2 W, 1.3	3530	63	499	348	69.7	195	1804–1999, 1.8	270/277	-
3 W, 1.3; eccentric trunk	2140	41	300	316	105	244	1755–1999, 1.3	250	270–290/280
4 W, 1.3	3390	54	486	353	72.6	196	1803–1999, 1.8	260/270	310–320/315
5 W, 1.3	3880	62	556	352	63.3	231	1768–1999, 1.5	340/371	280–290/285
6 E, 1.0	3830	60	550	341	62	238	1761–1999, 1.4	350/393	-
7 NE, 1.0	3520	60	501	360	71.9	264	1735–1999, 1.4	330/358	310–330/320
8 ?, 6.5; trunk fallen	2700	63	367	366	99.7	292	1707–1999, 1.25 (1.3)	294/294	270–290/280
9 ?, 1.0	2720	63	370	197	53.2	218	1781–1999, 0.9	303/411	-
10 SW, 1.15	5050	60	744	348	46.8	153	1846–1999, 2.3	310/323	260–280/270
11 SW, 1.0	3840	60	551	346	62.3	198	1801–1999, 1.7	304/324	270–290/280
12 S, 1.2; eccentric trunk	2500	26	372	381	102.4	146	1853–1999, 2.6	146	140–150/145
13 S, 1.13	1980	38	277	267	96.4	148	1851–1999, 1.8	151/154	-
14 E, 1.2	4740	65	690	335	48.6	108	1891–1999, 3.1	250/223	190–220/205
15 S, 1.2	2630	20	399	339	85	127	1872–1999, 2.7	155/148	137
16 N, 1.25	2680	40	387	359	92.8	180	1819–1999, 2.0	193/194	-
17 W, 1.2	2700	35	395	345	87.3	168	1831–1999, 2.1	193/188	230–250/240
18 NW, 1.2	2070	25	305	274	89.8	143	1856–1999, 1.9	152/161	146
19 S, 1.06	5070	62	745	371	49.8	180	1819–1999, 2.1	322/355	210–230/220
20 S, 1.36	4740	50	705	367	52.1	184	1815–1999, 2.0	330/353	250–280/265
21 SE, 1.25	4050	53	592	286	48.3	172	1827–1999, 1.7	337/348	270–300/285
22 S, 1.4	4100	40	613	378	61.7	221	1778–1999, 1.7	320/361	365

The relation between breast height and age of oaks_

No	Diameter at breast height of oaks		Age of trees in years

	Russian feet (0.3048 m)	cm
1	6 1/2	198	100
2	10 5/6	330	200
3	15 1/4	465	300
4	18 1/8	552	400
5	21	640	500
6	22 1/2	686	600
7	24	732	700
8	27	823	900
9	28 1/2	869	1000

A history of varying methods for determining tree age in Estonia with emphasis on oak

Figures & Tables

Figure 1

Figure 2

Figure 3

The relation between breast height and age of oaks_

Paradigm

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