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Determining the mechanism of 'protective effects' of hardwoods on spruce budworm defoliation of balsam fir

Determining the mechanism of 'protective effects' of hardwoods on spruce budworm defoliation of balsam fir
确定硬木对香脂冷杉云杉芽虫落叶的“保护作用”机制
批准号:
239857-2013
负责人:
MacLean, David
金额:
$2.4万
依托单位:
依托单位国家:
加拿大
项目类别:
Discovery Grants Program - Individual
财政年份:
2013
资助国家:
加拿大
项目状态:
已结题
起止时间:
2013-01-01 至 2014-12-31

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中文摘要
翻译
硬木的存在降低了香脂冷杉对云杉芽虫落叶的易感性和脆弱性。当硬木成分超过30% ~ 60%时,冷杉林的幼芽落叶减少。较高的硬木含量最大的影响是降低冷杉死亡率,这被认为是由于在阔叶木含量较高的林分中,幼芽的寄生率较高或散布一、二龄云杉幼芽的损失较大。硬木成分对落叶的影响也影响冷杉树的生长,因为观察到随着硬木含量的增加,平均径向生长减少量更小。
英文摘要
Balsam fir-spruce susceptibility and vulnerability to spruce budworm defoliation are reduced by the presence of hardwoods. Fir stands sustain less budworm defoliation when >30-60% hardwood composition is exceeded. The greatest effect of higher hardwood content is reduction of fir mortality, thought to result from higher parasitism rates of budworm or greater losses of dispersing first- and second-instar spruce budworm larvae in stands with greater hardwood content. Hardwood composition effects on defoliation also influence fir-spruce tree growth, as lower mean radial growth reductions have been observed with higher hardwoods.
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