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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:
2014
资助国家:
加拿大
项目状态:
已结题
起止时间:
2014-01-01 至 2015-12-31

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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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