地中海西洋松森林生长对水分敏感性降低作为干旱诱导树木死亡风险的潜在指标

IF 2.7 3区 农林科学 Q2 ECOLOGY
Asier Herrero, Raquel González-Gascueña, Patricia González-Díaz, Paloma Ruiz-Benito, Enrique Andivia
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引用次数: 0

摘要

导语过去几十年来,全球与干旱相关的树木死亡率一直在上升,影响了森林生态系统的结构和功能,对能源、碳和水通量产生了影响。然而,对个人易受干旱引起的死亡的了解仍然有限。方法在西班牙中部广阔的森林地区,对分布广泛的西尔维斯特松(Pinus sylvestris L.)进行死亡率分析。我们比较了年龄和体型相近的活着的和最近死亡的个体的径向生长模式,从而将体型和环境的影响从死亡过程中分离出来。比较了活树和新死树的生长动态、生长同步和生长对水分有效性(降水减去潜在蒸散)的敏感性。在过去的50年里,尽管我们没有发现活树和死树之间生长的显著差异,但随着干旱强度的增加,所有树木的生长同步和对水分有效性的敏感性(即生长模型中气候水平衡的斜率)都有所增加。死亡前20 a,死亡个体的生长同步性和生长对水分敏感性均低于活个体,但生长差异不显著。枯死树木的生长同步性和生长对水分敏感性的降低表明树木生长与气候之间存在脱钩,这可能会增加在日益干旱的条件下发生水力衰竭和/或碳饥饿的风险。因此,应进一步探索利用生长对水供应的敏感性降低作为树木死亡的潜在预警信号,以及生长同动性降低,特别是在季节性干旱地区的松树中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reduced growth sensitivity to water availability as potential indicator of drought-induced tree mortality risk in a Mediterranean Pinus sylvestris L. forest
Introduction Drought-associated tree mortality has been increasing worldwide since the last decades, impacting structure and functioning of forest ecosystems, with implications for energy, carbon and water fluxes. However, the understanding of the individual vulnerability to drought-induced mortality is still limited. Methods We aimed to identify the factors that triggered the mortality of the widely distributed Pinus sylvestris L. in an extensive forest area in central Spain. We compared radial growth patterns in pairs of alive and recently dead individuals that co-occur in close proximity and present similar age and size, thereby isolating the effects of size and environment from the mortality process. Temporal dynamics of growth, growth synchrony, and growth sensitivity to water availability (precipitation minus potential evapotranspiration) were compared between alive and recently dead trees. Results and discussion Over the last 50 years, although we did not detect significant differences in growth between alive and dead trees, an increase in the growth synchrony and sensitivity to water availability (i.e. slope of the climatic water balance in the growth model) was observed in all trees as drought intensity increased. 20 years before mortality, dead individuals showed lower growth synchrony and growth sensitivity to water availability than alive ones, without significant differences in growth. Recorded reduction in growth synchrony and growth sensitivity to water availability in dead trees suggests a decoupling between tree growth and climate, which could increase the risk of hydraulic failure and/or carbon starvation under increasingly arid conditions. Thus, the use of reduced growth sensitivity to water availability as potential early-warning signal of tree mortality, together with reduced growth synchrony, should be further explored, particularly in pine species in seasonally dry areas.
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来源期刊
CiteScore
4.50
自引率
6.20%
发文量
256
审稿时长
12 weeks
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