Archive image from page 8 of Defoliation and mortality in Connecticut. Defoliation and mortality in Connecticut forests defoliationmorta00step Year: 1981 20 40 60 80 I00 I20 I40 I967 TOTAL BASAL AREA, cr o 5 I970 TOTAL BASAL AREA, Fig. 6. Periodic basal area loss of major species in tracts with defoliation. The sites are as in Fig. 2. The line is the trend of basal area loss observed during 1927-37 in the Meshomasic tracts. Upper. Meshomasic series 1967-77. All tracts defoliated 1971 and 1972. Cox (circled) severely defoliated in 1971. Lowerâ New series 1970-80. Cat I in
Archive image from page 8 of Defoliation and mortality in Connecticut. Defoliation and mortality in Connecticut forests defoliationmorta00step Year: 1981 20 40 60 80 I00 I20 I40 I967 TOTAL BASAL AREA, cr o 5 I970 TOTAL BASAL AREA, Fig. 6. Periodic basal area loss of major species in tracts with defoliation. The sites are as in Fig. 2. The line is the trend of basal area loss observed during 1927-37 in the Meshomasic tracts. Upper. Meshomasic series 1967-77. All tracts defoliated 1971 and 1972. Cox (circled) severely defoliated in 1971. Lowerâ New series 1970-80. Cat I in Wood defoliated 1972; Natchaug defoliated 1972 and 1973; Gay City (circled) defoliated in 1971, 1972 and 1973. area was to percent. Generally, losses were higher on medium moist and dry sites than on moist sites. In a more recent decade, 1967-77, with two consecutive defoli- ations, average loss of basal area from the canopy ranged from to percent annu- ally. In 1967-77 losses on Turkey Hill, defoliated only once during 1957-67 and twice during 1967-77, were generally greater than on the other Meshomasic tracts on all sites, especially on the dry site. Again, there is the suggestion that the amount of mortality in one decade affects the amount in a suc- ceeding decade with defoliation. The canopy is generally comprised of pole and sawtimber trees, that is, trees with dbh at least and inches, respectively. At Haddam loss of pole and sawtimber trees increased with increasing defoliation. Dur- ing 1971-74 on line A, with minimum defolia- tion, about 19 percent of major species mor- tality came from the canopy. On line C the canopy contributed 26 percent of mortality while on line D, with greatest defoliation, canopy mortality was 40 percent of all major species mortality. Mostly pole-sized trees died. Only 3 percent of the mortality during 1971-74 came from sawtimber trees.
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