The limits of freely-available tree-ring chronologies
The limits of freely-available tree-ring chronologies
复制标题
免费树木年轮年表的局限性
DOI：
10.1016/j.quascirev.2020.106264
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发表时间：
2020
影响因子：
4
通讯作者：
Meko, David M.
中科院分区：
文献类型：
--
作者：
Coulthard, Bethany L.;St. George, Scott;Meko, David M.
树木被列为地球上最长寿的生物之一。由于它们的生长同时受到生物和非生物因素的影响，许多形成年轮的物种为过去的环境和生态变化提供了一个特殊的长期档案。作为树木年代学家根深蒂固的数据共享文化的证明，树木年轮记录现在可以从世界各地免费获得4，并在气候科学和森林生态学中广泛使用。其中许多数据集是以年轮‘年表’的形式呈现的--由同一地点数十或8棵以上树木的年轮宽度、木材密度、同位素组成或其他解剖或生物地球化学变量的测量值平均而成的6个复合系列(Cook和Kairiukstis 1990)。如此丰富的时间分辨率和空间覆盖率的低成本环境数据集具有吸引力，这是可以理解的，但使用树轮10年表需要对应用于生成它们的方法和这些方法施加的11个限制有深刻的理解。在这篇评论中，我们讨论了树木年轮年表的几个重要但通常是12个未被认识的方面，它们可能是解释树轮年表所必需的，并强调了13种使这些数据更适合广泛使用的方法。14由于内源性16(生物)因素，大多数单株树木的年度径向测量包含强烈的趋势，因此在将其汇编和解释为外源17(环境)影响的证据之前，必须通过称为去趋势化或标准化的程序来消除这些年龄/大小趋势(Fritts 1976)。随着树木年龄的增长，总的年轮宽度序列通常呈现出从宽到窄的逐渐下降的趋势，并形成大约20个不断增加的树干周长的类似体积的木材。然而，随着树木从幼年木材过渡到成熟木材，最大晚材密度序列在最初几十年中迅速增加，然后22减少，因为它们将更少的资源用于加厚细胞壁(Esper等人。2010)。约23人
Trees rank as some of the longest-lived organisms on our planet. Because their growth is affected 1 by both biotic and abiotic factors, many species that form annual rings provide an exceptional, 2 long-term archive of past environmental and ecological change. As testament to the deeply-3 rooted culture of data-sharing by dendrochronologists, tree-ring records are now freely available 4 from thousands of locations worldwide and used extensively in climate science and forest 5 ecology. Many of these datasets are presented in the form of a tree-ring ‘chronology’—a 6 composite series made by averaging together measurements of tree-ring width, wood density, 7 isotopic composition, or other anatomical or biogeochemical variables from several dozen or 8 more trees at the same location (Cook and Kairiukstis 1990). Low-cost environmental datasets of 9 such rich time resolution and spatial coverage are understandably attractive, but using tree-ring 10 chronologies requires a deep understanding of the methods applied to produce them and the 11 limits those methods impose. In this comment, we discuss several important but often 12 unrecognized aspects of tree-ring chronologies that can are needed for their interpretation, and 13 highlight ways to make these data more suitable for widespread use. 14 15Most annual radial measurements from individual trees contain strong trends due to endogenous 16 (biological) factors, so before they can be compiled and interpreted as evidence of exogenous 17 (environmental) influences, those age/size trends must be removed through a procedure known 18 as detrending or standardization (Fritts 1976). Total ring-width sequences often exhibit a gradual 19 decline from wide to narrow rings as a tree ages and forms a similar volume of wood about the 20 ever-increasing circumference of its stem. Maximum latewood density sequences, however, 21 increase rapidly during early decades as trees transition from juvenile to mature wood, then 22 reduce as they dedicate fewer resources to thickening their cell walls (Esper et al. 2010). Some 23
影响因子：
16.6
作者：
Klesse, Stefan;DeRose, R. Justin;Evans, Margaret E. K.
通讯作者：
Evans, Margaret E. K.
影响因子：
8.3
作者：
Brewer, Peter W.
通讯作者：
Brewer, Peter W.
影响因子：
4.3
作者：
N. McKay;J. Emile‐Geay
通讯作者：
N. McKay;J. Emile‐Geay