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
12 1.0'DRISCOLL ~ coastal ~o 0 inland [id lulu ~ unknown 0 home collected 1'20 'S 1130'S 1.40 ·s 1.50'S 1"0'5 1170'S Fig. 2 - Seed Purchase Pattern 1920-1977 PATIERN OF PLANTING Where records are available, the early pattern of planting places lodgepole pine as the fifth most important species after Sitka spruce, Scots pine, Norway spruce and European larch. During this period in the early thirties the percentage of lodgepole pine planted ranged from 6 to 15%. No figures are available for the forties. In the early fifties, however, it became the most widely used species when its use ranged from 26 to 40% . This expansion of its use corresponded with the increased afforestation programme in the west of the country. Its position as dominant species lasted three years and from then until 1977 it has always ranked second to Sitka spruce. This pattern is reflected in its reduced use in the sixties. It nevertheless remained high ranging from 22 to 31 %. In the early part of the seventies it dropped to its lowest level for twenty years at 21 %. However as the decade progressed it was returned to a high level of 35 % of plants used (Anon 1933-1977, Anon 1976-1977) (Fig. 3). % ~o 2.0 , J'. J'a 50 ,. ,'a ,'2 ,', ,'0 ,'s Fig. 3 - Percentage of Lodgepole pine Planted 1933-1977
LODGEPOLE PINE IN IRISH FORESTRY 13 PRODUCTIVITY No readily available data exists for the total area of productive forest of lodgepole pine in the State at the present time. The earlier inventory of 1968 covered planting between 1923 and 1958, and recorded an area of 18,700 hectares (O'F1anagan 1973). The recently completed 1975 inventory covered plantings between 1959 and 1968, the data of which are at present being processed. A small area in private woodlands has also been recorded (Gallagher and Purcell 1976). The bulk of the area in the earlier inventory was planted pure with only 11 % being in mixture. Classified under broad provenance headings, 8,400 hectares, representing 45 % of the total area in state forests in 1968 was of coastal origin. The Lulu island group represented 37% with an area of 6,900 hectares, while the inland group with 18% of the area had 3,400 hectares. The productivity differences between these broad groups was quite large. The most productive, as might be expected, was the coastal group with a range of productivity from yield class 6 to 16 and an average value of 12. The bulk of the area within this group, 72% was present in yield classes 11 and 16. The range of yield classes for the Lulu island group was from 2 to 12 with an average value of 6. However the bulk of the area, 59% was present in yield classes 6 to 8. The third broad group, that of the inland provenances also had a productive range of yield class 2 to 12 with an average value of 6. As with the Lulu group 67% of the productive area of the inland group fell within the confines of yield classes 6 to 8 (Fig. 4). The values for the coastal lodgepole are likely to be revised upwards as a result of findings in the recent (1975) Inventory (Clinch 1977). % ~o 4j) 3j) 19 r 6 8 11 16 246781012 2 4 6 7 8 1012 coastal lulu inland Fig. 4 - Percentage Area by Yield Class 1968 Inventory.
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LODGEPOLE PINE IN IRISH FORESTRY 13<br />
PRODUCTIVITY<br />
No readily available data exists for the total area <strong>of</strong> productive<br />
forest <strong>of</strong> lodgepole pine in the State at the present time. <strong>The</strong> earlier<br />
inventory <strong>of</strong> 1968 covered planting between 1923 and 1958, and<br />
recorded an area <strong>of</strong> 18,700 hectares (O'F1anagan 1973). <strong>The</strong><br />
recently completed 1975 inventory covered plantings between 1959<br />
and 1968, the data <strong>of</strong> which are at present being processed. A small<br />
area in private woodlands has also been recorded (Gallagher and<br />
Purcell 1976). <strong>The</strong> bulk <strong>of</strong> the area in the earlier inventory was<br />
planted pure with only 11 % being in mixture. Classified under<br />
broad provenance headings, 8,400 hectares, representing 45 % <strong>of</strong><br />
the total area in state forests in 1968 was <strong>of</strong> coastal origin. <strong>The</strong> Lulu<br />
island group represented 37% with an area <strong>of</strong> 6,900 hectares, while<br />
the inland group with 18% <strong>of</strong> the area had 3,400 hectares. <strong>The</strong><br />
productivity differences between these broad groups was quite<br />
large. <strong>The</strong> most productive, as might be expected, was the coastal<br />
group with a range <strong>of</strong> productivity from yield class 6 to 16 and an<br />
average value <strong>of</strong> 12. <strong>The</strong> bulk <strong>of</strong> the area within this group, 72% was<br />
present in yield classes 11 and 16. <strong>The</strong> range <strong>of</strong> yield classes for the<br />
Lulu island group was from 2 to 12 with an average value <strong>of</strong> 6.<br />
However the bulk <strong>of</strong> the area, 59% was present in yield classes 6 to<br />
8. <strong>The</strong> third broad group, that <strong>of</strong> the inland provenances also had a<br />
productive range <strong>of</strong> yield class 2 to 12 with an average value <strong>of</strong> 6. As<br />
with the Lulu group 67% <strong>of</strong> the productive area <strong>of</strong> the inland group<br />
fell within the confines <strong>of</strong> yield classes 6 to 8 (Fig. 4). <strong>The</strong> values for<br />
the coastal lodgepole are likely to be revised upwards as a result <strong>of</strong><br />
findings in the recent (1975) Inventory (Clinch 1977).<br />
%<br />
~o<br />
4j)<br />
3j)<br />
19<br />
r<br />
6 8 11 16 246781012 2 4 6 7 8 1012<br />
coastal lulu inland<br />
Fig. 4 -<br />
Percentage Area by Yield Class 1968 Inventory.
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