PDF(Pubmed)
Abstract：
Predicting global change mitigations based on environmental variables, like temperature and water availability, although yielding insightful hypothesis still lacks the integration of environmental responses. Physiological limits should be assessed to obtain a complete representation of a species\' fundamental niche. Detailed ecophysiological studies on the response of trees along the latitudinal gradient are rare. They could shed light on the behaviour under different light intensities and other studied traits. The forests of the Dinaric Mountains and the Carpathians represent the largest contiguous forest complexes in south-eastern Europe. In uneven-aged Carpathian (8 plots) and Dinaric Mountain (11 plots) forests, net assimilation (Amax) and maximum quantum yield (Φ) were measured for beech and fir in three predefined light intensity categories according to the indirect site factor (ISF%) obtained by the analysis of hemispherical photographs in managed and old growth forests, all located above 800 m a.s.l. The measurements were carried out under fixed environmental conditions in each light category per plot for three consecutive years. Data from the last 50-year average period from the CRU TS 4.01 dataset were used for the comparison between Amax, Φ, and climate. The highest Φ for beech were observed in the central part of the Dinaric Mountains and in the south westernmost and northwesternmost part of the Carpathians for both beech and fir, while they were highest for fir in the Dinaric Mountains in the northwesternmost part of the study area. The Φ-value of beech decreased in both complexes with increasing mean annual temperature and was highest in the open landscape. For fir in the Carpathians, Φ decreased with increasing mean annual temperature, while in the Dinaric Mountains it increased with higher temperature and showed a more scattered response compared to the Carpathians. Short-term ecophysiological responses of beech and fir were consistent to long-term radial growth observations observed on same locations. The results may provide a basis and an indication of the future response of two tree species in their biogeographical range to climate change in terms of competitiveness, existence and consequently forest management decisions.
摘要：
根据环境变量预测全球变化缓解措施，比如温度和水的可用性，虽然产生有见地的假设仍然缺乏环境反应的整合。应评估生理极限，以获得物种基本生态位的完整代表。很少有关于树木沿纬度梯度响应的详细生态生理学研究。他们可以阐明在不同光强度和其他研究特征下的行为。Dinaric山脉和喀尔巴士山脉的森林代表了东南欧最大的连续森林综合体。在年龄不均匀的喀尔巴师（8块）和迪纳里山（11块）森林中，根据通过分析管理和旧生长森林的半球形照片获得的间接场地因子（ISF%），在三个预定义的光强度类别中测量了山毛榉和杉木的净同化（Amax）和最大量子产率（Φ）。所有位于800ma.s.l.测量是在固定的环境条件下连续三年在每个地块的每个光照类别中进行的。来自CRUTS4.01数据集的过去50年平均期间的数据用于比较Amax，Φ,和气候。在Dinaric山脉的中部以及喀尔巴壁山脉的最西南和最西北的部分观察到山毛榉和冷杉的最高Φ，而在研究区域最西北的迪纳里山脉，冷杉的冷杉最高。随着年平均温度的升高，两种复合物中山毛榉的Φ值都降低，在开阔的景观中最高。对于喀尔巴斯山脉的冷杉来说，Φ随着年平均气温的升高而降低，而在Dinaric山脉，它随着温度的升高而升高，并且与喀尔巴士山脉相比表现出更分散的响应。山毛榉和冷杉的短期生态生理反应与在同一位置观察到的长期径向生长观察结果一致。研究结果可能为两个树种在其生物地理范围内对气候变化的竞争力方面的未来响应提供基础和指示，存在，进而导致森林管理决策。
