Thinning and Prescribed Fire Effects on Forest Floor Fuels in the East Side Sierra Nevada Pine Type
Thinning and Prescribed Fire Effects on Forest Floor Fuels in the East Side Sierra Nevada Pine Type
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DOI：
10.1300/j091v23n02_06
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发表时间：
2006-12
影响因子：
1.6
通讯作者：
R. Walker;R. M. Fecko;W. B. Frederick;J. Murphy;Dale W. Johnson;W. W. Miller-W.
中科院分区：
文献类型：
--
作者：
R. Walker;R. M. Fecko;W. B. Frederick;J. Murphy;Dale W. Johnson;W. W. Miller-W.
摘要在内华达山脉东部的Jeffrey Pine(Pinus Jeffreyi Grev)地区，对采用定尺采伐和全树采伐结合规定的欠烧方式完成的森林间伐进行了评估，以评估其对所有时间类别的倒下和死燃料载量的影响。&Balf.)切割成长度的采伐导致总燃料负荷大约翻了一番，最大的增加发生在100小时和1000小时类别，而与整棵树收获相关的变化很小，整个处理后的负荷在全树和无鳍处理之间差别很小。间伐后，采伐处理的1+10小时和总燃料积累量和全树处理的1000小时燃料积累量与采伐断面积、采收的叶、枝、干和总生物量在简单回归模型中呈正相关。随后在欠燃过程中的消耗消除了从切割到加长收获时增加的1+10小时和100小时燃料以及这些类别中的一部分自然负荷，但在减少这种收获产生的1000小时燃料方面效果要差得多。在所有间伐处理中，1+10小时、100小时和总燃料的消耗量与欠燃前每类燃料的消耗量呈正相关。本文报告的结果提供了对实地做法引起的燃料负荷变化的洞察，这些做法正越来越多地纳入改善美国西部森林健康和火灾复原力的综合管理努力。
Abstract Forest thinning accomplished with cut-to-length and whole-tree harvesting systems combined with prescribed underburning were assessed for their impacts on downed and dead fuel loading of all timelag categories in eastern Sierra Nevada Jeffrey pine (Pinus jeffreyi Grev. & Balf.). Cut-to-length harvesting resulted in an approximate doubling of total fuel loads with the greatest increases occurring in the 100-hr and 1000-hr categories, while changes associated with whole tree harvesting were marginal to the extent that overall posttreatment loading differed little between whole-tree and unfhinned treatments. Following the thinning operations, 1 + 10-hr and total fuel accumulations in the cut-to-lengfh treatment and 1000-hr fuels in the whole-tree treatment were positively correlated with harvested basal area and harvested foliage, branch, bole, and total tree biomass in simple regression models. Subsequent consumption during underburning eliminated 1 + 10-hr and 100-hr fuel additions from cut-to-lengfh harvesting along with a portion of the natural loading in these categories but was much less effective in reducing the 1000-hr fuels generated by this harvesting. Consumption of 1 + 10-hr, 100-hr, and total fuels in all thinning treatments was positively correlated with the amounts present within each category before underburning. Results reported here provide insight into fuel load modifications resulting from field practices that are being increasingly integrated into comprehensive management efforts to improve forest health and fire resilience in the western United States.