Stable isotope inferred intrinsic water use efficiency and its relation to N sources in temperate tree regeneration with increasing levels of N deposition, precipitation, and temperature

IF 4.5 2区 生物学 Q2 ENVIRONMENTAL SCIENCES
Viktoria Dietrich , Jörg Niederberger , Markus Hauck
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Abstract

Under ongoing climate change, the mechanisms controlling the vigor and growth performance of tree regeneration are still less understood than for mature trees. Using stable isotope signatures (δ13C, δ15N), we studied intrinsic water use efficiency (WUEi, with δ13C as a proxy) and N relations and their interaction in differently drought-tolerant temperate tree species. We conducted a Germany-wide field study representing independent precipitation, temperature, and N deposition levels, comparing European beech (Fagus sylvatica), sessile oak (Quercus petraea), silver fir (Abies alba), and Douglas fir (Pseudotsuga menziesii) in the regeneration stage. At high N deposition WUEi was decreased in all tree species and in beech in particular, as δ13C signatures became more negative. This suggests that high N loads give rise to a differentiated discussion of the drought tolerance of tree species depending on the level of N deposition. In the conifers direct uptake of N from atmospheric deposition was important, as indicated by increasing foliar δ15N with increasing N concentration. In the broadleaved trees with better decomposable leaf litter, the main effect of N deposition was indicated through low δ15N signatures suggesting an intensification of uptake from N mineralization. Foliar δ15N signatures, and hence presumed changes in mineralization, were affected by soil chemistry, mean annual precipitation and temperature, but may also be influenced by deposition or other soil properties, which must be acknowledged when considering our results. To complement our results, comparable studies should be conducted for mature forest stands, including ecophysiological measurements of leaf gas exchange or tree water relations.
稳定同位素揭示了温带乔木再生中随N沉降、降水和温度增加的内在水分利用效率及其与N源的关系
在持续的气候变化条件下,与成熟乔木相比,人们对乔木更新活力和生长性能的控制机制仍知之甚少。利用稳定同位素特征(δ13C、δ15N),研究了不同耐旱温带树种内在水分利用效率(WUEi,以δ13C为代表)与氮的关系及其相互作用。我们在德国范围内进行了一项代表独立降水、温度和N沉降水平的野外研究,比较了欧洲山毛榉(Fagus sylvatica)、无根栎树(Quercus petaea)、银杉(Abies alba)和花旗松(Pseudotsuga menziesii)在更新阶段的变化。在高氮沉降条件下,所有树种的WUEi均呈下降趋势,尤其是山毛榉,其δ13C特征趋于负。这表明,高N负荷引起了树种耐旱性的差异讨论,这取决于N沉降水平。在针叶树中,直接从大气沉降中吸收N很重要,叶面δ15N随N浓度的增加而增加。在可分解凋落叶较好的阔叶树中,低δ15N特征表明氮沉降的主要作用是强化了对氮矿化的吸收。叶面δ15N特征以及由此推测的矿化变化受到土壤化学、年平均降水和温度的影响,但也可能受到沉积或其他土壤性质的影响,在考虑我们的结果时必须承认这一点。为了补充我们的结果,应该对成熟林分进行类似的研究,包括叶片气体交换或树水关系的生态生理测量。
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来源期刊
Environmental and Experimental Botany
Environmental and Experimental Botany 环境科学-环境科学
CiteScore
9.30
自引率
5.30%
发文量
342
审稿时长
26 days
期刊介绍: Environmental and Experimental Botany (EEB) publishes research papers on the physical, chemical, biological, molecular mechanisms and processes involved in the responses of plants to their environment. In addition to research papers, the journal includes review articles. Submission is in agreement with the Editors-in-Chief. The Journal also publishes special issues which are built by invited guest editors and are related to the main themes of EEB. The areas covered by the Journal include: (1) Responses of plants to heavy metals and pollutants (2) Plant/water interactions (salinity, drought, flooding) (3) Responses of plants to radiations ranging from UV-B to infrared (4) Plant/atmosphere relations (ozone, CO2 , temperature) (5) Global change impacts on plant ecophysiology (6) Biotic interactions involving environmental factors.
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