Download Full PDF - 30.01 MB - The Society of Irish Foresters
Download Full PDF - 30.01 MB - The Society of Irish Foresters Download Full PDF - 30.01 MB - The Society of Irish Foresters
Table 2 Diameter Breast Height, Basal Area, Length and Volume of the Sample Trees. ' J . ,,, Tree No. 2 3 4 5 6 7 8 9 10 Diameter B .H . em 19.9 26.8 31.0 33.0 35.8 37.2 40.3 42.6 45.6 51.0 Basal area m 2 .03079 .05641 .07547 .08553 .10060 .10868 .12755 .14253 .16331 .20428 Tota l length (m) 20.8 25.8 25 .9 25.7 30.6 27.4 30.9 30.0 26.6 28.5 Length to 7em diam (m) 17.2 22.2 22.4 22.4 26.6 24.1 27.1 26.4 23.5 Volume to 7em m 3 .32197 .75821 .89488 .86151 1.3402 1.3819 1.7428 1.7741 1.9388 23.5 2.2366 ~ r (j » ;0 tT1 -
WHOLE TREE HARVESTING 53 Soil and Forest Floor: Ten samples of the forest floor were taken at random within the stand using a 25 x 25cm metal frame. All organic matter encountered including twigs - which were sparse - was included. The boundary between the forest floor an"d forest soil was clear and abrupt and the two easily separated. One representative soil pit was opened and sampled for determination of bulk density, net soil volume (proportion of soilless than 2mm fraction expressed as a percentage of the total soil weight free of stones) and nutrient content. Because there were clear horizon boundaries at 30 and 55cm the nutrient contents were determined for 3 separate layers, 0-30.0-55 and O-lOOcm. Laboratory: Moisture contents were determined by drying at 105°C to constant weight. Duplicate samples for chemical analysis were dried at 90°C. Nitrogen, · phosphorus and potassium were ditermined on the tree and forest floor samples using conventional methods cited in the previous study (Carey and O'Brien op. cit.). Total N, P and K in the soil samples were determined following air drying using standard techniques. Soil bulk density was determined hy the waxing technique. Statistical: The nutrient contents for the various components were determined from their dry weights and nutrient concentrations. A series of linear regressions were then calculated relating both dry weights and nutrient contents of the components to the basal area of each of the sample trees. Because the relationship proved good in most instances, reliable estimates could be made of both nutrient and dry matter contents for the mean tree and from this the whole sample plot. RESULTS AND DISCUSSION The dry weights for the various components of each of the sample trees are given in Table 3. Moisture contents varied considerably between components and trees. The bole wood had an average moisture content of 50% (on a fresh weight basis). The dead branches had an average moisture content of 32% and the bark on both live branches and tree stems a mean moisture content of 65%. The total dry weights of the ten sample trees varied between 225 and l290kg. The results of the chemical analyses for the different components on each sample tree are presented in Table 4. As expected nutrient concentrations vary considerably between components. Highest concentrations occur in the needles, bark and cones, the lowest concentrations being associated with the wood samples. These findings are in agreement with results from the previous study
- Page 20 and 21: :2 Notes for the Assistance of Cont
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- Page 40 and 41: 22 J. O'DRISCOLL Forbes, A. C. 1928
- Page 42 and 43: JOHN J. GARDINER In this context it
- Page 44 and 45: 26 JOHN J. GARDINER 80 % 60 - --- P
- Page 46 and 47: JOHN J. GARDINER profit in its twel
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Table 2 Diameter Breast Height, Basal Area, Length and Volume <strong>of</strong> the Sample Trees.<br />
' J .<br />
,,,<br />
Tree No. 2 3 4 5 6 7 8 9<br />
10<br />
Diameter B .H . em 19.9 26.8 31.0 33.0 35.8 37.2 40.3 42.6 45.6<br />
51.0<br />
Basal area m 2 .03079 .05641 .07547 .08553 .10060 .10868 .12755 .14253 .16331<br />
.20428<br />
Tota l length (m) 20.8 25.8 25 .9 25.7 30.6 27.4 30.9 30.0 26.6<br />
28.5<br />
Length to 7em diam (m) 17.2 22.2 22.4 22.4 26.6 24.1 27.1 26.4 23.5<br />
Volume to 7em m 3 .32197 .75821 .89488 .86151 1.3402 1.3819 1.7428 1.7741 1.9388<br />
23.5<br />
2.2366<br />
~<br />
r<br />
(j<br />
»<br />
;0<br />
tT1<br />
-
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