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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引用次数: 0

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.
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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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