An experimental comparison of stand management approaches to sudden oak death: prevention vs restoration
An experimental comparison of stand management approaches to sudden oak death: prevention vs restoration
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橡树猝死林分管理方法的实验比较：预防与恢复
DOI：
10.1139/cjfr-2022-0328
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发表时间：
2023
影响因子：
2.2
通讯作者：
Cobb, Richard
中科院分区：
文献类型：
--
作者：
Quiroga, Gissella Betzavel;Simler-Williams, Allison B;Frangioso, Kerri M;Frankel, Susan;Rizzo, David M.;Cobb, Richard
从加州中部到俄勒冈州西南部的许多沿海森林受到威胁或受到入侵森林病原体Phytophthora ramorum的影响，这是导致橡树突然死亡的原因。我们分析了一组林分水平的森林治疗，旨在防止或减轻疾病的影响，林分组成，生物量和燃料使用前后控制干预实验，5年后重新评估。我们比较了两个标准水平的实验，入侵的林分和未入侵的森林的预防性治疗的恢复性管理的效果。恢复性治疗对比两种方法咀嚼，手工船员稀疏，并与未经处理的对照组在三个不同的网站（N = 30），而预防性治疗仅限于手工船员稀疏（N = 10）在一个单一的网站进行燃烧堆变薄。一半的恢复治疗的基础芽去除治疗后2年和4年。所有治疗显着降低林分密度和增加平均树的大小没有显着降低总断面积，立即和5年后的治疗。对磷不敏感的树种，交替处理并不降低其断面积或密度。枝，这表明这些物种的相对优势度增加，根据主机去除。后续的基础萌芽在恢复实验中的去除似乎保持治疗效益的平均树的大小，并可能与林分密度5年后，初步治疗的小幅度下降。我们的研究表明，在至少5年的时间里，一系列常见的林分管理措施可以改善受橡树猝死威胁或影响的森林状况。
Many coastal forests stretching from central California to southwest Oregon are threatened or have been impacted by the invasive forest pathogenPhytophthora ramorum, the cause of sudden oak death. We analyzed a set of stand-level forest treatments aimed at preventing or mitigating disease impacts on stand composition, biomass, and fuels using a before–after-control-intervention experiment with a re-evaluation after 5 years. We compared the effects of restorative management for invaded stands and preventative treatments for uninvaded forests with two stand-level experiments. The restorative treatments contrasted two approaches to mastication, hand-crew thinning, and thinning with pile burning with untreated controls replicated at three distinct sites (N= 30), while the preventative treatments were limited to hand-crew thinning (N= 10) conducted at a single site. Half of the restoration treatments had basal sprouts removed 2 and 4 years after treatment. All treatments significantly reduced stand density and increased average tree size without significantly decreasing total basal area, both immediately and 5 years after treatments. Preventative treatments did not reduce the basal area or density of timber species not susceptible toP. ramorum, suggesting the relative dominance of these species increased in accordance with host removal. Follow-up basal sprout removal in the restoration experiment appears to maintain treatment benefits for average tree size and may be associated with small decreases in stand density 5 years after initial treatment. Our study demonstrates that for at least 5 years, a range of common stand management practices can improve forest conditions threatened or impacted by sudden oak death.