Download Full PDF - 28.09 MB - The Society of Irish Foresters
Download Full PDF - 28.09 MB - The Society of Irish Foresters Download Full PDF - 28.09 MB - The Society of Irish Foresters
Crop Structure and Productivity for Unthinned Sitka Spruce 4714 %Basal areadead/ila.121086424 8 12 16 '20Top Heightl"ig. 3. Percentage basal area mortality in unthinned Sitka spruce for topheight. .mmortality figures encountered were approximately 40% of stemsdead, equivalent to 20% of basal area at a high stocking level (over5,000 per ha.) in a 36 year crop
48211815top'ht.mIrish ForestryIIIIffIfIII24/1---___ -;16/ I.1296II/""",-r.-/,/'"6/ / 12 survey data YC [estJ./ 12 BFC [19711 YC1020 30 40age yrsFig. 4. Height/age categories of unthinned Sitka spruce for yield classesdefined by volume production per annum at any age.DISCUSSION ON YIELD AND PRODUCTIVITY CLASSESThe productivity classes which have been calculated representa wider range of production for top height, especially in youngcrops that has heretofore, been realised in this country. Patternsfor unthinned stands are not quite the same as shown by Hamiltonand Christie (1971) for thinned stands. In figure 5 production
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- Page 12 and 13: IRISH FORESTRYVolume 29 1972 No.2Ed
- Page 14 and 15: Some Forestry Problems in the Europ
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- Page 24 and 25: The Response of Sitka Spruce to Sul
- Page 26 and 27: The R esponse of Sitka Spruce to Su
- Page 28 and 29: The R esponse of Sitka Spruce to Su
- Page 30 and 31: The R esponse of Sitka Spruce to Su
- Page 32 and 33: The R esponse of Sitka Spruce to Su
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- Page 36 and 37: The Response 0 fSitka Spruce to Sul
- Page 38 and 39: Labour Cost Trends in ForestNurseri
- Page 40 and 41: Labour Cost Trends in Forest Nurser
- Page 42 and 43: SOJ?e Patterns in Crop Structureand
- Page 44 and 45: Crop Structure and Productivity for
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- Page 62 and 63: Trees Woods and Literature- · 7A w
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Crop Structure and Productivity for Unthinned Sitka Spruce 4714 %Basal areadead/ila.121086424 8 12 16 '20Top Heightl"ig. 3. Percentage basal area mortality in unthinned Sitka spruce for topheight. .mmortality figures encountered were approximately 40% <strong>of</strong> stemsdead, equivalent to 20% <strong>of</strong> basal area at a high stocking level (over5,000 per ha.) in a 36 year crop
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