Interactions of thinning and stem height on the drought response of radial stem growth and isotopic composition of Norway spruce (Picea abies).
Interactions of thinning and stem height on the drought response of radial stem growth and isotopic composition of Norway spruce (Picea abies).
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间伐和茎高对挪威云杉径向茎生长和同位素组成的干旱响应的相互作用
DOI：
10.1093/treephys/tps077
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发表时间：
2012
期刊：
影响因子：
4
通讯作者：
Bauhus
中科院分区：
文献类型：
--
作者：
J. A. ;Kohler;GeGler;Bauhus
树干径向生长和年轮的同位素组成通常用于量化干旱对树木的影响。然而，通常这些参数仅在一个茎高处量化，例如，1.3 m，不知道这对于整个股骨柄的代表性如何。 研究了10株挪威云杉（共）优势树种在重度间伐（HT）和中度间伐（MT）林分中4个高度（1.3、5.5、9.8和14m）的径向生长和2个高度（1.3和14 m）的木材Δ 13 C和δ 18 O，以评估不同间伐强度是否影响不同高度树干的干旱响应。 比较了不同间伐处理和不同株高的早材和晚材断面积年生长量和稳定同位素的变化。对于BAI，还分析了与气候的线性相关性。HT树不同高度的径向生长和同位素组成对干旱的响应相似，而MT树则随高度而变化，对气候变化也更敏感。干旱后恢复的径向生长更快的树木从HT相比，MT的立场，除了最高的高度。胸高（1.3米）的断面积增量提供了很好的估计体积生长响应干旱的整个干，但不是其恢复。 在1.3米的高度HT的径向生长恢复速度更快，与MT树相比，2003年干旱后，并没有伴随着同位素组成的恢复差异。 然而，这可能与处理之间的差异存储C和树结构（叶面积，根系）的再动员。
Radial stem growth and the isotopic composition of growth rings are commonly used to quantify the effects of droughts on trees. However, often these parameters are quantified only at one stem height, e.g., 1.3 m, and it is not known how representative this is for the whole stem. This study investigated radial growth at four stem heights (1.3, 5.5, 9.8 and 14 m) of 21, and wood Δ13C and δ18O at two heights (1.3 and 14 m) of 10 (co-)dominant Norway spruce trees from heavily (HT) and moderately thinned (MT) stands to assess whether different thinning intensities influenced the drought response of stems at different tree heights. Annual basal area increments (BAIs) and stable isotopes in earlywood and latewood were compared between thinning treatments and among the different stem heights. For BAIs, linear correlations with climate were analysed as well. The response of radial growth and isotopic composition to drought was similar at different stem heights in HT trees, but varied with height in MT trees, which were also more sensitive to climatic variations. Recovery of radial growth after drought was more rapid in trees from HT compared with MT stands, except for the topmost height. Basal area increments at breast height (1.3 m) provided good estimates of the volume growth response to drought for the whole stem, but not for its recovery. The faster recovery of radial growth at 1.3 m height of HT compared with MT trees after the 2003 drought was not accompanied by differences in recovery of isotopic composition. However, this is likely to be related to differences between treatments in remobilization of stored C and in tree structure (leaf area, root systems).
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DOI：
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发表时间：
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影响因子：
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作者：
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