Temporal patterns of radial growth in declining Austrocedrus chilensis forests in Northern Patagonia: The use of tree-rings as an indicator of forest decline
Temporal patterns of radial growth in declining Austrocedrus chilensis forests in Northern Patagonia: The use of tree-rings as an indicator of forest decline
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DOI：
10.1016/j.foreco.2011.10.021
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发表时间：
2012-02-01
影响因子：
3.7
通讯作者：
Larson, Bruce C.
中科院分区：
文献类型：
--
作者：
Amoroso, Mariano M.;Daniels, Lori D.;Larson, Bruce C.
使用树木年代学，结合树和立场的信息，我们重建的时间动态的“马尔德尔cipres”，在阿根廷的智利南方雪松森林的广泛下降。我们开发了12个新的网站特定的年轮宽度年表代表树木的生长没有外部（冠）或内部（径向生长）的下降症状。通过比较这些参考年表的个别树木的环宽系列，我们检测到减少径向生长，可能是由于“马尔德尔cipres”，在301症状和死亡的上层树木的1082采样树。径向生长下降也发生在67个无症状的树冠提供证据表明，径向生长下降可以是一个早期指标的“苹果树”。所有树木的径向生长下降的长度平均为27年，分别为29年和22年的生活症状和死亡的上层树木，分别为：最大的下降长度为80年。在现场水平，径向生长下降的开始范围从20世纪20年代初到60年代，在历史记录中报告的日期之前。到1979年，每个站点>= 75%的树木表现出径向生长下降。我们的结论是，在径向生长下降之前，冠症状至少在一些A。chilensis树木在森林与'mal del cipres'。减少径向生长之前，外部冠症状意味着水分的吸收已经减少，可能是因为根损害疫霉或干旱或它们的相互作用。它还表明，旨在根除有树冠症状的树木并促进残留树木生长的挽救性收获可能不是对“苹果树”最有效的管理对策。(C)2011爱思唯尔有限公司版权所有。
Using dendrochronology, combined with tree- and stand-level information, we reconstructed the temporal dynamics of 'mal del cipres', a widespread decline of Austrocedrus chilensis forests in Argentina. We developed 12 new site-specific ring-width chronologies representing the growth of trees with no external (crown) or internal (radial growth) symptoms of decline. By comparing the ring-width series of individual trees with these reference chronologies, we detected reduced radial growth, likely due to 'mal del cipres', in 301 symptomatic and dead overstory trees out of 1082 sampled trees. Radial growth decline also occurred in 67 living trees with asymptomatic crowns providing evidence that radial growth decline can be an early indicator of 'mal del cipres'. The length of the radial growth decline averaged 27 years for all trees and was 29 and 22 years for living symptomatic and dead overstory trees, respectively: the maximum decline length was 80 years. At the site level, the onset of radial growth decline ranged from the early 1920s to the 1960s, preceding dates reported in historical records. By 1979, >= 75% of trees per site exhibited radial growth decline. We conclude that decline in radial growth precedes crown symptoms in at least some A. chilensis trees in forests with 'mal del cipres'. Reduced radial growth prior to external crown symptoms implies that water uptake had been reduced, possibly because of root damage from Phyophthora or drought or their interactions. It also suggests salvage harvests that aim to eradicate trees with crown symptoms and facilitate growth of residual trees may not be the most effective management response to 'mal del cipres'. (C) 2011 Elsevier B.V. All rights reserved.