Immagine di archivio da pagina 9 della defogliazione e mortalità in Connecticut. Defogliazione e mortalità in Connecticut foreste defoliationmorta00passo Anno: 1981 8 Connecticut Agricolo di Esperimento Stazione Bollettino 796 è quindi chiaro che una singola defogliazione in un decennio ha poco effetto su alberi nella tettoia, ma ripetuta defogliazione aumenta la mortalità e la percentuale di mortalità provenienti dalla tettoia alberi aumenta, specialmente tra pole-dimensioni alberi. Le differenze tra i gruppi di specie i risultati presentati finora sono medi mor- tality di tutte le principali specie presenti nei tratti in esame. Howeve

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Archive image from page 9 of Defoliation and mortality in Connecticut. Defoliation and mortality in Connecticut forests defoliationmorta00step Year: 1981 8 Connecticut Agricultural Experiment Station Bulletin 796 Thus, it is clear that a single defoliation in a decade has little effect on trees in the canopy, but repeated defoliation increases mortality and the proportion of mortality coming from canopy trees increases, especially among pole-size trees. Differences Among Species Groups Results presented so far are average mor- tality of all major species present in the tracts examined. However, Table 2 shows that not all species or species groups are defoli- ated similarly. The mortality among species groups during a decade on undefoliated tracts and on tracts with one, two or three defolia- tions is tabulated in Table 4. Maples include red and sugar maple; birches include black, yellow and paper birch; oaks include red, black, scarlet, white, and chestnut oak. All are found on the Meshomasic series and all but chestnut oak are found on the New series. Oaks generally had greater mortality of stems than did maples or birches. For exam- ple, on Turkey Hill during a decade without defoliation, 1927-37, mortality of oak was greater than that of maple and birch (Table 4, A). During later decades with one or two defoliations, mortality of oak stems was greater than that of maple and birch, but the difference was slight in 1967-77 (Table 4, A). On Cox, Reeves and Cabin tracts (Table 4, B) oak mortality is greater than that of maple and birch during 1927-37 with no defoliation and during 1957-67 with three defoliations. However, during 1967-77 with two defoliations, the percentage of stems dying was less for oak than for other species groups. On undefoliated Norfolk of the New series oak mortality was low and less than maple, birch or other species groups (Table 4, C). On Catlin Wood relatively great oak mortality during 1959-70 without defolia- tion was followed by light mort

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