Radial growth of Qilian juniper on the Northeast Tibetan Plateau and potential climate associations.
Radial growth of Qilian juniper on the Northeast Tibetan Plateau and potential climate associations.
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青藏高原东北部祁连杜松的径向生长与潜在的气候关联
DOI：
10.1371/journal.pone.0079362
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Briffa KR
中科院分区：
文献类型：
--
作者：
Qin C;Yang B;Melvin TM;Fan Z;Zhao Y;Briffa KR
青藏高原东北部高山林线林木径向生长的限制气候因子存在争议。在这项研究中，我们从331棵树上收集了594个增量核心，分组在跨越3550至4020英里的四个海拔带内。在单一的山坡上。我们绘制了四个相当的年轮宽度年表，并表明它们在1956年至2011年期间的增长-气候响应或在公元1110-2011年期间的较长期增长模式没有显著差异。气候对径向生长的主要影响是降水变率。缺失年轮分析表明，林线最上端的树木径向生长对气候变化的敏感性高于其他海拔，树木径向生长不良尤其与严重干旱事件的发生有关。因此，水分限制而不是温度胁迫是控制圆柏径向生长的关键因素。在这一地区的树线上。这一发现与任何关于高海拔树线环境中的年轮年表主要是温度变化的指标的概括相矛盾。
There is controversy regarding the limiting climatic factor for tree radial growth at the alpine treeline on the northeastern Tibetan Plateau. In this study, we collected 594 increment cores from 331 trees, grouped within four altitude belts spanning the range 3550 to 4020 m.a.s.l. on a single hillside. We have developed four equivalent ring-width chronologies and shown that there are no significant differences in their growth-climate responses during 1956 to 2011 or in their longer-term growth patterns during the period AD 1110–2011. The main climate influence on radial growth is shown to be precipitation variability. Missing ring analysis shows that tree radial growth at the uppermost treeline location is more sensitive to climate variation than that at other elevations, and poor tree radial growth is particularly linked to the occurrence of serious drought events. Hence water limitation, rather than temperature stress, plays the pivotal role in controlling the radial growth of Sabina przewalskii Kom. at the treeline in this region. This finding contradicts any generalisation that tree-ring chronologies from high-elevation treeline environments are mostly indicators of temperature changes.
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影响因子：
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