Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.14543 |
Fire deficits have increased drought sensitivity in dry conifer forests: Fire frequency and tree-ring carbon isotope evidence from Central Oregon | |
Voelker, Steven L.1; Merschel, Andrew G.2; Meinzer, Frederick C.3; Ulrich, Danielle E. M.4; Spies, Thomas A.5; Still, Christopher J.2 | |
2019-04-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2019 |
卷号 | 25期号:4页码:1247-1262 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A century of fire suppression across the Western United States has led to more crowded forests and increased competition for resources. Studies of forest thinning or stand conditions after mortality events have provided indirect evidence for how competition can promote drought stress and predispose forests to severe fire and/or bark beetle outbreaks. Here, we demonstrate linkages between fire deficits and increasing drought stress through analyses of annually resolved tree-ring growth, fire scars, and carbon isotope discrimination (Delta C-13) across a dry mixed-conifer forest landscape. Fire deficits across the study area have increased the sensitivity of leaf gas exchange to drought stress over the past >100 years. Since 1910, stand basal area in these forests has more than doubled and fire-return intervals have increased from 25 to 140 years. Meanwhile, the portion of interannual variation in tree-ring Delta C-13 explained by the Palmer Drought Severity Index has more than doubled in ca. 300-500-year-old Pinus ponderosa as well as in fire-intolerant, ca. 90-190-year-old Abies grandis. Drought stress has increased in stands with a basal area of >= 25 m(2)/ha in 1910, as indicated by negative temporal Delta C-13 trends, whereas stands with basal area <= 25 m(2)/ha in 1910, due to frequent or intense wildfire activity in decades beforehand, were initially buffered from increased drought stress and have benefited more from rising ambient carbon dioxide concentrations, [CO2], as demonstrated by positive temporal Delta C-13 trends. Furthermore, the average Delta C-13 response across all P. ponderosa since 1830 indicates that photosynthetic assimilation rates and stomatal conductance have been reduced by similar to 10% and similar to 20%, respectively, compared to expected trends due to increasing [CO2]. Although disturbance legacies contribute to local-scale intensity of drought stress, fire deficits have reduced drought resistance of mixed-conifer forests and made them more susceptible to challenges by pests and pathogens and other disturbances. |
英文关键词 | basal area carbon isotope discrimination CO2 drought resistance fire suppression ponderosa pine stand density stomatal conductance |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000461817500007 |
WOS关键词 | PINUS-PONDEROSA TREES ; WATER-USE EFFICIENCY ; STAND DENSITY ; STABLE-CARBON ; GAS-EXCHANGE ; EVAPORATIVE DEMAND ; FUEL TREATMENTS ; CLIMATE-CHANGE ; SIERRA-NEVADA ; CASCADE RANGE |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17161 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Utah State Univ, Plants Soils & Climate Dept, Logan, UT 84322 USA; 2.Oregon State Univ, Dept Forest Ecosyst & Soc, Corvallis, OR 97331 USA; 3.US Forest Serv, Pacific Northwest Res Stn, USDA, Corvallis, OR USA; 4.Los Alamos Natl Lab, Los Alamos, NM USA; 5.US Forest Serv, USDA, Pacific Northwest Res Stn, Portland, OR USA |
推荐引用方式 GB/T 7714 | Voelker, Steven L.,Merschel, Andrew G.,Meinzer, Frederick C.,et al. Fire deficits have increased drought sensitivity in dry conifer forests: Fire frequency and tree-ring carbon isotope evidence from Central Oregon[J]. GLOBAL CHANGE BIOLOGY,2019,25(4):1247-1262. |
APA | Voelker, Steven L.,Merschel, Andrew G.,Meinzer, Frederick C.,Ulrich, Danielle E. M.,Spies, Thomas A.,&Still, Christopher J..(2019).Fire deficits have increased drought sensitivity in dry conifer forests: Fire frequency and tree-ring carbon isotope evidence from Central Oregon.GLOBAL CHANGE BIOLOGY,25(4),1247-1262. |
MLA | Voelker, Steven L.,et al."Fire deficits have increased drought sensitivity in dry conifer forests: Fire frequency and tree-ring carbon isotope evidence from Central Oregon".GLOBAL CHANGE BIOLOGY 25.4(2019):1247-1262. |
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