Impact of sawfly defoliation on growth of Scots pine Pinus sylvestris (Pinaceae) and associated economic losses
Impact of sawfly defoliation on growth of Scots pine Pinus sylvestris (Pinaceae) and associated economic losses
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DOI：
10.1079/ber2002154
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发表时间：
2002-04-01
影响因子：
1.9
通讯作者：
Tomppo, E
中科院分区：
文献类型：
--
作者：
Lyytikäinen-Saarenmaa, P;Tomppo, E
双叶锯蝇的针叶落叶降低了赤松 Pinus sylvestris L 的增量和木材产量。本研究的目的是提供这种下降的近似估计以及生长损失和树木死亡率的经济价值的初步估计。在芬兰西部研究了 Diprion pini (Linnaeus) 针损伤后生长损失。从遭受轻度、中度和重度落叶的树木中采集增量核心样本，进行径向生长测量。进行了一项文献调查，以估计 Neodiprion sertifer (Geoffroy) 落叶后径向生长损失。经济后果的计算基于之前的估计和正在进行的第九次芬兰国家森林清查。 N. sertifer 和 D. pini 的中度落叶分别使体积生长减少了 21% 和 86%，而重度落叶则分别减少了 38% 和 94%。据记录，落叶林中的树木死亡率在 N. sertifer 爆发后约为 4%，在 D. pini 爆发后约为 30%。在单年爆发 N. sertifer 后，由于生长减少和树木死亡造成的损失估计平均经济价值达到 40 ha(-1) 美元，而 D. pini 爆发则达到 310 ha(-1) 美元。这些对经济损失的初步估计表明，松叶蜂的影响比欧洲早期的几项研究揭示的影响要大得多。
Needle defoliation by diprionid sawflies decreases the increment and timber yield of Scots pine Pinus sylvestris L. The aim of this study was to provide approximate estimates of this decrease and preliminary estimates of the economic value of growth losses and tree mortality. Growth loss after needle damage by Diprion pini (Linnaeus) was studied in western Finland. Increment cores were sampled for radial growth measurements from trees subjected to slight, moderate and heavy defoliation. A literature survey was carried out to estimate radial growth losses after defoliation by Neodiprion sertifer (Geoffroy). Calculations for economic consequences were based on previous estimates and on the ongoing 9th Finnish National Forest Inventory. Moderate defoliation by N. sertifer and D. pini reduced volume growth by 21% and 86% and heavy defoliation by 38% and 94%, respectively. Tree mortality in defoliated stands was recorded as approximately 4% after an outbreak of N. sertifer and 30% after an outbreak of D. pini. The estimated average economic value of the losses due to reduced growth and tree mortality reached $40 ha(-1) after a single-year outbreak of N. sertifer and $310 ha(-1) in the case of D. pini. These preliminary estimates of economic losses indicate a much higher impact of pine sawflies than those revealed by the few earlier studies in Europe.