Growth response of the alpine shrub, Linanthus pungens, to snowpack and temperature at a rock glacier site in the eastern Sierra Nevada of California, USA
Growth response of the alpine shrub, Linanthus pungens, to snowpack and temperature at a rock glacier site in the eastern Sierra Nevada of California, USA
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DOI：
10.1016/j.quaint.2012.07.018
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发表时间：
2013-10-15
影响因子：
2.2
通讯作者：
Franklin, Rebecca S.
中科院分区：
文献类型：
--
作者：
Franklin, Rebecca S.
高海拔和高纬度植物的年轮年代学在气候、生态和地貌学方面有许多尚未开发的应用。本文首次报道了刺绵草（Linanthus pungens, Torr.）的灌木年轮年表。J.M.波特和洛杉矶。内华达山脉东峰Barney Lake （BL）岩石冰川（37.56466N, 118.96554W）的L pungens年表长度为77年，具有足够的样本复制（表达种群信号，EPS, >0.75），可以捕获1946年至2007年的鲁棒共同信号。BL年代学的标志年对应于干旱（宽环）和持续积雪（窄环）。响应函数分析表明，7月最高气温与历年11月降水呈显著相关。径向主根生长在近百年间变化不大，在年代学前期与温度呈显著正相关，在年代学后期与积雪量和PPT呈显著负相关。因此，对高山内华达山脉积雪减少和气温升高的预测预计将导致灌木生长增加，如果未来前所未有的干旱不限制其生长，那么灌木的丰度和范围可能会增加。(C) 2012 Elsevier Ltd和INQUA。版权所有。
Annual ring chronologies in high-elevation and high latitude plants have numerous, but largely unexplored, climatic, ecological and geomorphologic applications. This paper presents the first shrub-ring chronology of Linanthus pungens (Torr.) J.M. Porter and LA. Johnson at the above-treeline Barney Lake (BL) rock glacier (37.56466N, 118.96554W) on the eastern crest of the Sierra Nevada, USA, The L pungens chronology is 77 years in length with sufficient sample replication (expressed population signal, EPS, >0.75) to capture a robust common signal from 1946 through 2007. Marker years in the BL chronology correspond to drought (wide rings) and persistent snowpack (narrow rings). Response function analysis indicates significant associations with July temperature maxima and previous years' November precipitation (PPT). Radial taproot growth has varied little over the past century and is significantly and positively correlated with temperature during the early portion of the chronology period and significantly and negatively correlated with both snowpack and PPT during the latter half of the chronology period. Predictions of decreasing snowpack and increasing temperatures for the alpine Sierra Nevada would therefore be expected to result in increased shrub growth and possible increases in shrub abundance and range expansion if unprecedented drought does not limit growth in the future. (C) 2012 Elsevier Ltd and INQUA. All rights reserved.