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首页> 外文期刊>IAWA Journal >Influence of climatic factors on silver fir xylogenesis along the Italian Peninsula
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Influence of climatic factors on silver fir xylogenesis along the Italian Peninsula

机译：气候因子对意大利半岛银冷Xyloyes作用的影响

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摘要

Xylem phenology has been widely recognised as an ecological indicator of the impact of environmental changes on forest ecosystems, especially at the edge of a species distribution. We investigated xylem phenology of silver fir (Abies alba Mill.) in three sites in Italy, between the 38th and 46th parallels. The phases of xylem phenology were assessed weekly on wood microcores collected from March to November 2015 to calculate timing and duration of xylem cell production. The effect of temperature and precipitation on xylem phenology were sequentially included in stepwise regressions and used to predict the duration of each phenological phase under three future climatic scenarios at different concentrations of greenhouse gases (RCP 2.6; 4.5; 8.5). A growing season of 163 days was detected in the southern site that was longer compared to the central (132 days) and northern (120 days) sites. A longer duration of xylogenesis was mostly related to a delayed completion of xylem differentiation in autumn rather than an earlier onset of cambium reactivation in spring. Overall, 67-76% of the duration of phenological phases was controlled by growing season precipitation, while 24-33% was influenced by minimum temperature. Inclusion of both the above factors in the modelling exercise simulated a lengthening of the silver fir growing season during the 21st century. A longer duration of xylogenesis was envisaged in the scenario RCP 8.5, especially in the central site. Population and climate gradients need to be considered when addressing phenological shifts and growth dynamics of silver fir in Mediterranean mountains.
机译：Xylem Phaphology已被广泛认为是环境变化对森林生态系统的影响的生态指标，特别是在物种分布的边缘。我们调查了意大利三个地点的银色冷杉（Abies Alba Mill）的木质毒品。每周在2015年3月至11月收集的木材微核中评估木质毒性的阶段，以计算木质电池生产的时序和持续时间。温度和沉淀对木瓜酚素的影响依次包含在逐步回归中，并用于预测不同浓度温室气体（RCP 2.6; 4.5; 8.5）的三个未来气候情景下的每种毒性相位的持续时间。在南部的南部地区检测到153天的不断增长的季节，与中央（132天）和北部（120天）的地点相比，较长。较长持续时间的Xyloyesis大多数与秋季的Xylem分化的延迟完成有关，而不是在弹簧中早先开始复合。总体而言，通过生长阶段的季节沉淀来控制67-76％，而24-33％受最低温度的影响。在建模运动中包含以上因素模拟21世纪中银杉木生长季节的延长。在情景RCP 8.5中设想了较长的Xyloyesis，特别是在中央部位。在地中海山区的挥发性换档和生长动态时，需要考虑人口和气候梯度。

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