Understanding beech (Fagus sylvatica L.) photosynthetic responses to microhabitat water deficit: a site-specific investigation

IF 2.6 2区 农林科学 Q1 FORESTRY
Milan Borišev, Milan Župunski, Danijela Arsenov, Nataša Nikolič, Sonja Tarčak, Slobodanka Pajevič
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Abstract

This study explores the nuanced influence of microclimatic conditions on beech stand acclimatization throughout the vegetational season. Three closely situated localities on a north-oriented slope within the National Park Fruška Gora (Serbia) were selected, each exhibiting minimal elevation differences but distinct microhabitat characteristics shaped by orographic and hydrological properties. The hypothesis posits that subtle habitat differentiations imprint distinctive physiological acclimatization patterns in beech stands. Using statistical tools like Multiple Factor Analyses (MFA), Standardized Major Axis (SMA), and Random Forest Analyses (RFA), the study identifies significant relationships among monitored parameters. The vegetational season, extracted from 15 years of NDVI data, reveals prolonged activity with earlier greening and delayed defoliation. MFA analyses highlight the high dependence of beech acclimatization on spatio-temporal properties, showcasing distinctive transitions between months within subpopulations. Reduced July precipitation significantly impacts photosynthetic intensity, transpiration, stomatal conductance, and water use efficiency. Higher localities, closer to the mountain ridge, exhibit heightened vulnerability to water deficit, evident in intense disturbance of photochemical efficiency. In contrast, the lower locality demonstrates tolerance to reduced rainfall, benefitting from additional soil water supply. The severity of drought stress, along with the intricate interplay of microhabitat environmental factors and plant physiological responses, appears to define the acclimatization strategy of beech plants and influence their recovery potential. These findings underscore the spatial microhabitat impact, particularly orographic properties, on beech acclimation to water deficit, with distinct temporal responses at each locality. Implications extend to modified forest management strategies within the National Park, especially in the context of climate change.

Abstract Image

了解山毛榉(Fagus sylvatica L.)光合作用对微生境缺水的反应:针对具体地点的调查
本研究探讨了小气候条件在整个植被季节对山毛榉林木适应性的微妙影响。研究选取了塞尔维亚弗鲁什卡戈拉国家公园(National Park Fruška Gora)内北向斜坡上三个相距较近的地点,每个地点的海拔差异都很小,但受地形和水文特性的影响,微生境特征各不相同。假设认为,微妙的生境差异会在山毛榉林中形成独特的生理适应模式。该研究利用多因素分析(MFA)、标准化主轴(SMA)和随机森林分析(RFA)等统计工具,确定了监测参数之间的重要关系。从 15 年的归一化差异植被指数数据中提取的植被季节显示,植被活动期延长,返青期提前,落叶期推迟。MFA分析凸显了山毛榉适应性对时空特性的高度依赖性,展示了亚群内不同月份之间的独特过渡。七月份降水量的减少对光合作用强度、蒸腾作用、气孔导度和水分利用效率有很大影响。靠近山脊的高处更容易受到缺水的影响,光化学效率受到严重干扰。与此相反,较低的地方则表现出对降雨量减少的耐受性,从额外的土壤水分供应中获益。干旱胁迫的严重程度,以及微生境环境因素和植物生理反应之间错综复杂的相互作用,似乎决定了山毛榉植物的适应策略,并影响其恢复潜力。这些发现强调了空间微生境(尤其是地形特性)对山毛榉适应缺水的影响,每个地点都有不同的时间反应。这些发现对国家公园内修改森林管理策略具有重要意义,尤其是在气候变化的背景下。
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来源期刊
CiteScore
5.10
自引率
3.60%
发文量
77
审稿时长
6-16 weeks
期刊介绍: The European Journal of Forest Research focuses on publishing innovative results of empirical or model-oriented studies which contribute to the development of broad principles underlying forest ecosystems, their functions and services. Papers which exclusively report methods, models, techniques or case studies are beyond the scope of the journal, while papers on studies at the molecular or cellular level will be considered where they address the relevance of their results to the understanding of ecosystem structure and function. Papers relating to forest operations and forest engineering will be considered if they are tailored within a forest ecosystem context.
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