Mountain pine beetle selectivity in old-growth ponderosa pine forests, Montana, USA.
Mountain pine beetle selectivity in old-growth ponderosa pine forests, Montana, USA.
复制标题
DOI：
10.1002/ece3.522
复制
发表时间：
2013-05
影响因子：
2.6
通讯作者：
Maxwell, Justin T.
中科院分区：
文献类型：
--
作者：
Knapp, Paul A.;Soule, Peter T.;Maxwell, Justin T.
关键词：
在过去的十年里，历史上前所未有的山松甲虫（MPB）爆发影响了蒙大拿州西部。我们研究了在蒙大拿州西部两个地点（Cabin Gulch和Kitchen Gulch）采集的健康成熟和mpb感染黄松的径向生长率（AD 1860-2007/8），并：(1)比较了种群内和不同地点之间的基底面积增量（BAI）值；(2)利用碳同位素分析计算了Cabin Gulch的内在水分利用效率（iWUE）；(3)利用一系列月度气候变量比较气候-生长响应。直到最近20-30年，种群内和站点间的BAI值相似，在这一点上，视觉健康的种群的BAI值始终高于mpb感染的树木（22-34%）。这些结果表明，在当前疫情爆发前的二三十年，我们选择的种群的生长速度不同，生长较慢的树木更容易受到甲虫的侵害。来自Cabin Gulch的两个样本的iWUE都呈上升趋势，从1955-59年开始，视觉健康的树木和1960-64年开始，iWUE显著转向更高的状态。在几十年的干燥夏季条件下，两个种群之间的耐旱性也有所不同，视觉健康的树木在感染前的生长率高于mpb感染的树木。在过去的150年中，这两个种群的内在水利用效率显著提高，但在视觉健康和mpb感染的年表之间没有显著差异。
A historically unprecedented mountain pine beetle (MPB) outbreak affected western Montana during the past decade. We examined radial growth rates (AD 1860–2007/8) of co-occurring mature healthy and MPB-infected ponderosa pine trees collected at two sites (Cabin Gulch and Kitchen Gulch) in western Montana and: (1) compared basal area increment (BAI) values within populations and between sites; (2) used carbon isotope analysis to calculate intrinsic water-use efficiency (iWUE) at Cabin Gulch; and (3) compared climate-growth responses using a suite of monthly climatic variables. BAI values within populations and between sites were similar until the last 20–30 years, at which point the visually healthy populations had consistently higher BAI values (22–34%) than the MPB-infected trees. These results suggest that growth rates two–three decades prior to the current outbreak diverged between our selected populations, with the slower-growing trees being more vulnerable to beetle infestation. Both samples from Cabin Gulch experienced upward trends in iWUE, with significant regime shifts toward higher iWUE beginning in 1955–59 for the visually healthy trees and 1960–64 for the MPB-infected trees. Drought tolerance also varied between the two populations with the visually healthy trees having higher growth rates than MPB-infected trees prior to infection during a multi-decadal period of drying summertime conditions. Intrinsic water-use efficiency significantly increased for both populations during the past 150 years, but there were no significant differences between the visually healthy and MPB-infected chronologies.
登录
查看更多内容
影响因子：
3.9
作者：
Kulakowski, Dominik;Jarvis, Daniel;Smith, Jeremy
通讯作者：
Smith, Jeremy
影响因子：
3.7
作者：
Brunelle, Andrea;Rehfeldt, Gerald E.;Munson, A. Steven
通讯作者：
Munson, A. Steven
影响因子：
4
作者：
EHLERINGER, JR;CERLING, TE
通讯作者：
CERLING, TE
影响因子：
5.2
作者：
Rodionov, SN
通讯作者：
Rodionov, SN
影响因子：
11.6
作者：
Knapp, Paul A.;Soule, Peter T.
通讯作者：
Soule, Peter T.