Recent unprecedented tree-ring growth in bristlecone pine at the highest elevations and possible causes
Recent unprecedented tree-ring growth in bristlecone pine at the highest elevations and possible causes
复制标题
DOI：
10.1073/pnas.0903029106
复制
发表时间：
2009-12-01
影响因子：
11.1
通讯作者：
Kipfmueller, Kurt F.
中科院分区：
文献类型：
--
作者：
Salzer, Matthew W.;Hughes, Malcolm K.;Kipfmueller, Kurt F.
大盆地狐尾松（Pinus longaeva）在北美西部接近树木生长上限海拔的3个地点显示，在20世纪后半叶的年轮生长比过去3,700年中任何其他50年的年轮生长都要大。这种加速的增长暗示着数千年来前所未有的环境变化。由于标准化技术的原因，高生长率没有被高估，它不太可能是树木生长形式变化的结果，也不太可能主要是由CO2施肥引起的。增长激增只发生在一个有限的海拔带内约150米的上树线，无论树线海拔。无论是一个独立的代理记录的温度和高海拔气象温度数据呈正相关，显着与上树线年轮宽度之前和期间的高增长间隔。高海拔地区温度的升高可能是这些地点的长叶松（Pinus longaeva）现代前所未有的增长水平的一个突出因素。
Great Basin bristlecone pine (Pinus longaeva) at 3 sites in western North America near the upper elevation limit of tree growth showed ring growth in the second half of the 20th century that was greater than during any other 50-year period in the last 3,700 years. The accelerated growth is suggestive of an environmental change unprecedented in millennia. The high growth is not overestimated because of standardization techniques, and it is unlikely that it is a result of a change in tree growth form or that it is predominantly caused by CO2 fertilization. The growth surge has occurred only in a limited elevational band within approximate to 150 m of upper treeline, regardless of treeline elevation. Both an independent proxy record of temperature and high-elevation meteorological temperature data are positively and significantly correlated with upper-treeline ring width both before and during the high-growth interval. Increasing temperature at high elevations is likely a prominent factor in the modern unprecedented level of growth for Pinus longaeva at these sites.