Co-Occurring Wyoming Pinus Species Exhibit Differing Climate–Growth Relationships
Co-Occurring Wyoming Pinus Species Exhibit Differing Climate–Growth Relationships
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DOI：
10.3959/trr2021-5
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发表时间：
2022-01
影响因子：
1.6
通讯作者：
Laura A. Dye;J. Pearl;Laura Smith;Bethany L Coulthard;Cori L. Butkiewicz;Z. Cooper;James Degrand;Jared Friedman;Inga K. Homfeld;H. Howard;Leroy Ironcloud;Shannon Wray
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作者：
Laura A. Dye;J. Pearl;Laura Smith;Bethany L Coulthard;Cori L. Butkiewicz;Z. Cooper;James Degrand;Jared Friedman;Inga K. Homfeld;H. Howard;Leroy Ironcloud;Shannon Wray
北美树木生态学现场周（NADEF）是一个密集的树木年代学研讨会，部分由美国国家科学基金会资助。NADEF的2019年介绍小组在Wolf Knob站点为Pinus contorta（lodgepole pine）和Pinus flexilis（limber pine）开发了两个精确的树木年轮宽度年表。熊牙湖以西5公里，怀俄明州，肖松尼国家森林（SNF）的范围内，在大黄石生态系统（GYE）。沃尔夫旋钮是一个半干旱，S-SW面临，中到高海拔的网站，使其成为一个理想的位置，以检查每年的树木年轮宽度增量的气候敏感性。在这里，我们表明，两个共处的松属物种表现出不同的气候生长关系，与P.扭叶松表现出相对较弱的相关性与降水（r = 0.37; p < 0.01）和温度（r = -0.23; p < 0.05），且柔枝委陵菜与两个冷季的总体相关性较强（r = 0.48; p < 0.01）和暖季降水（r = 0.51; p < 0.01）以及积雪记录（r = 0.45; p < 0.05）。我们的研究结果表明，这两个松属物种可能面临不同的威胁，在面对区域气候变化，与P. flexilis特别容易受到干旱条件和减少积雪在GYE。不同的季节气候敏感性的两个物种可能是由微站点条件（如土壤水分容量，传入的太阳辐射）和不同的物种气候响应，强调的重要性，不仅网站的选择，但也microsite和个人选择在年轮气候采样。最后，这项工作有助于确定GYE中的雪水当量（SWE）敏感的树木年轮代理，这对于了解北美西部持续变暖引起的积雪减少至关重要，特别是考虑到到2075年的大部分无雪（4月1日）GYE的预测。
ABSTRACT The North American Dendroecological Field week (NADEF) is an intensive dendrochronology workshop, funded in part by the National Science Foundation. The 2019 Introductory Group at NADEF developed two precisely dated tree-ring width chronologies for Pinus contorta (lodgepole pine) and Pinus flexilis (limber pine) at the Wolf Knob site ca. 5 km west of Beartooth Lake, WY, within the bounds of the Shoshone National Forest (SNF), in the Greater Yellowstone Ecosystem (GYE). Wolf Knob is a semi-arid, S- to SW-facing, mid- to high-elevation site, making it an ideal location to examine the climate sensitivity of annual tree-ring width increments. Here, we show that two co-located Pinus species exhibit differing climate–growth relationships, with P. contorta exhibiting relatively weak correlations with precipitation (r = 0.37; p < 0.01) and temperature (r = –0.23; p < 0.05) during the late summer, and P. flexilis exhibiting stronger overall correlations with both cool-season (r = 0.48; p < 0.01) and warm-season precipitation (r = 0.51; p < 0.01) as well as with snowpack records (r = 0.45; p < 0.05). Our results suggest these two Pinus species may face disparate threats in the face of regional climate change, with P. flexilis being particularly vulnerable to drought conditions and declining snowpacks in the GYE. The differing seasonal climate sensitivities of the two species is likely caused by microsite conditions (e.g. soil moisture capacity, incoming solar radiation) and distinct species-climate responses, underscoring the importance of not only site selection, but also microsite and individual selection in dendroclimatological sampling. Finally, this work contributes to identifying Snow Water Equivalent (SWE)-sensitive tree-ring proxies in the GYE, critical for understanding ongoing warming-induced snowpack declines across western North America, particularly given the projections of a largely snow-free (April 1) GYE by 2075.