Climatic significance of tree-ring width and δ13C in a Spanish pine forest network
Climatic significance of tree-ring width and δ13C in a Spanish pine forest network
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DOI：
10.1111/j.1600-0889.2008.00370.x
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发表时间：
2008-11-01
影响因子：
2.3
通讯作者：
Schleser, Gerhard H.
中科院分区：
文献类型：
--
作者：
Andreu, Laia;Planells, Octavi;Schleser, Gerhard H.
本文研究了五个伊比利亚松林网络的树轮宽度和三角洲 C-13 年表，以确定它们在不同场地条件下对气候变化的敏感性。系列间比较表明，与不同地点的树木年轮宽度系列相比，Delta C-13 记录之间的一致性更好、更均匀。这表明δ C-13 比率可能优先记录大范围的气候信号，而环宽变化可能反映更多的局部因素。环宽和 delta C-13 之间存在负相关关系。根据响应函数分析推断，环宽和 Delta C-13 显示出与气候的显着关系。对不同地点和物种的分析揭示了树木年轮宽度对夏季温度和降水的不同响应，而所有 Delta C-13 系列对当年夏季降水高度敏感，并且在较小程度上对当前夏季温度高度敏感。强烈的夏季降水信号似乎主导了地中海气候下生长的树木的 Delta C-13，即使平均气候条件并不表明明显的夏季干旱。因此，Delta C-13 值比树木年轮宽度更好地反映了夏季降水量的变化。这表明，树木年轮中的 Delta C-13 可以成为地中海地区气候重建的非常有用的工具，特别是在气候与增长关系较弱的情况下。
This paper examines tree-ring width and delta C-13 chronologies from a network of five Iberian pine forests to determine their sensitivity to climate variability under different site conditions. Interseries comparisons revealed better and more homogenous agreement among delta C-13 records than among tree-ring width series of the different sites. This suggests that delta C-13 ratios may preferentially record large-scale climatic signals, whereas ring-width variations may reflect more local factors. A negative relationship was found between ring-width and delta C-13. As inferred from response function analyses, ring-width and delta C-13 showed significant relationships with climate. The analyses of different sites and species revealed unshared tree-ring width responses to summer temperature and precipitation, whereas all delta C-13 series were highly sensitive to current year summer precipitation and, to a lesser extent, to current summer temperature. A strong summer precipitation signal seems to dominate the delta C-13 of trees growing under Mediterranean climate, even when the mean climatic site conditions do not indicate distinct summer drought. Therefore, delta C-13 values reflect precipitation variability during the summer season better than tree-ring widths. This demonstrates that delta C-13 from tree-rings can be a very useful tool for climatic reconstruction in the Mediterranean region, especially when climate-growth relationships are weak.