Spruce budworm defoliation and growth loss in young balsam fir: recovery of growth in spaced stands
Spruce budworm defoliation and growth loss in young balsam fir: recovery of growth in spaced stands
复制标题
云杉芽虫落叶和年轻香脂冷杉的生长损失：间隔林中生长的恢复
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
H. Piene
中科院分区：
文献类型：
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作者：
H. Piene
被云杉芽孢子虫(Choristoneurafumiferana(Clem.)1至4年，并随后被保护，迅速恢复叶片生物量。25-30年生香脂冷杉(Abiesbalsamga(L.)MILL。)对新斯科舍省布雷顿角高地上的树木进行了研究。两个主要因素导致了生长恢复速度的快速提高：能够产生萌芽，同时增加了对老龄级针叶的保留，以及以牺牲材积增长为代价发展了新的叶子。材积增量在极端落叶2年后完全恢复，但在严重落叶4年后仍未完全恢复。新梢的产生只与新梢和芽的破坏有关，因此，仅对当前叶进行部分落叶后，生长恢复较慢。在所研究的所有样地中，叶生物量的增加与材积增长的显著增加之间存在2-3年的滞后。
Trees defoliated by the spruce budworm (Choristoneurafumiferana (Clem.)) for 1 to 4 years and subsequently protected rapidly regained foliar biomass. Three plots of 25- to 30-year-old balsam fir (Abiesbalsamga (L.) Mill.) trees, on the Cape Breton Highlands of Nova Scotia, were studied. Two major factors contributed to the rapid growth recovery rates: the ability to produce epicormic shoots, combined with increased retention of older age-classes of needles, and the development of new foliage at the expense of volume growth. A complete recovery of volume increment occurred after 2 years of extreme defoliation, but not after 4 years of severe defoliation. Epicormic shoot production was only associated with shoot and bud destruction and therefore, growth recovery was slow after partial defoliation of only current foliage. In all plots studied, there was a lag of 2 to 3 years between increased foliar biomass and significant increases in volume increment.