Mitigation of drought by thinning: Short-term and long-term effects on growth and physiological performance of Norway spruce (Picea abies)
Mitigation of drought by thinning: Short-term and long-term effects on growth and physiological performance of Norway spruce (Picea abies)
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DOI：
10.1016/j.foreco.2013.07.048
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发表时间：
2013-11
影响因子：
3.7
通讯作者：
J. Sohn;T. Gebhardt;C. Ammer;J. Bauhus;K. Häberle;R. Matyssek;T. Grams
中科院分区：
文献类型：
--
作者：
J. Sohn;T. Gebhardt;C. Ammer;J. Bauhus;K. Häberle;R. Matyssek;T. Grams
我们假设，减少林分密度，通过间伐提高挪威云杉树（云杉）从严重干旱的径向茎生长的恢复。然而，间伐可能不会导致较高的相对径向生长在干旱期间。在德国南部的两个地点，对重度间伐（HT）、中度间伐（MT）和未间伐对照林分的树木进行了早期和晚期木材的年度干生长和稳定碳氧同位素的评估。从稳定同位素分析推断的树木的生理性能被用来解释每年的干生长在1976年和2003年的干旱事件。只有在最近变薄的立场，树木保持增长可能是通过更高的土壤水分供应量在干旱的一年相比，控制。与此相反，无论间伐和干旱之间的时间跨度，在干旱后的几年中，间伐改善了生长恢复。我们的结论是，间伐改善干旱恢复响应在短期和长期内，应被视为一种有效的管理策略，以提高挪威云杉林的耐旱性。
We hypothesize that reductions in stand density through thinning improve the recovery of radial stem growth in Norway spruce trees (Picea abies) from severe drought. However, thinning may not lead to higher relative radial growth during drought. Annual stem growth and stable carbon and oxygen isotopes in early- and latewood were assessed in trees from heavily thinned (HT), moderately thinned (MT) and un-thinned control stands at two sites in southern Germany. Physiological performance of trees as inferred from stable isotope analysis was used to interpret annual stem growth in response to the drought events in 1976 and 2003. Only in recently thinned stands, trees maintained growth probably through higher soil water availability during the drought year when compared to controls. In contrast, thinning improved the growth recovery in the years following the drought irrespective of the time span between thinning and drought. We conclude that thinning improves drought recovery response in the short and long term and should be considered as an effective management strategy to increase drought tolerance of Norway spruce stands.