رسالة جامعية
Dry deposition and canopy exchange for temperate tree species under high nitrogen deposition
| العنوان: | Dry deposition and canopy exchange for temperate tree species under high nitrogen deposition |
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| المؤلفون: | Adriaenssens, Sandy |
| المساهمون: | Verheyen, Kris, Boeckx, Pascal, Samson, Roeland |
| بيانات النشر: | Ghent University. Faculty of Bioscience Engineering |
| سنة النشر: | 2012 |
| المجموعة: | Ghent University Academic Bibliography |
| مصطلحات موضوعية: | Earth and Environmental Sciences, atmospheric deposition, throughfall, canopy budget model, 15N-labelling, dry deposition, nitrogen deposition, Terrestrial Laser Scanning, foliar uptake, Wettability, Stomatal characteristics, Artifical foliage, Passive samplers |
| الوصف: | Increased deposition of atmospheric nitrogen (N) and sulphur (S) on forest ecosystems has caused changes in biogeochemical processes, which may have adverse effects on forest structure and functioning. Therefore, an accurate quantification of total atmospheric deposition is required to establish cause-effect relationships and evaluate abatement measures and mitigation strategies. However, measurements of dry deposition, which is a major fraction of total deposition on forests, are still subject to several problems and are complicated by canopy exchange processes in tree canopies. This study aimed to address existing knowledge gaps on dry deposition and canopy exchange, in particular of N, and to gain a better understanding of the influence the forest canopy exerts on these processes. Next to this, we aimed to evaluate the often-used canopy budget model to calculate total atmospheric deposition from throughfall measurements. Dry deposition and canopy exchange processes were examined at different spatio-temporal scales for five temperate tree species widespread in Western Europe, a region with a high N deposition load. The effect of forest canopy characteristics, i.e. leaf characteristics and canopy structure, on the measured response variable was examined. Retention of inorganic N from wet (ammonium (NH4+), nitrate (NO3-)) and dry (ammonia (NH3)) deposition by foliage and twigs was quantified for saplings of European beech (Fagus sylvatica L.), pedunculate oak (Quercus robur L.), silver birch (Betula pendula Roth.) and Scots pine (Pinus sylvestris L.) by means of stable N isotope (15N) tracing. Retention patterns for dissolved inorganic N were mainly determined by foliar uptake, except for Scots pine. In general, retention rates were 3-10 times higher for 15NH4+ than for 15NO3-, 2-3 times higher for deciduous species than for Scots pine and lower for developing leaves, although this was tree species dependent. The observed effects of tree species and phenological stage in foliar retention could be related to ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| وصف الملف: | application/pdf |
| اللغة: | English |
| ردمك: | 978-90-5989-508-9 90-5989-508-8 |
| العلاقة: | https://biblio.ugent.be/publication/2073942Test; http://hdl.handle.net/1854/LU-2073942Test; urn:isbn:9789059895089; https://biblio.ugent.be/publication/2073942/file/4335904Test |
| الإتاحة: | https://biblio.ugent.be/publication/2073942Test http://hdl.handle.net/1854/LU-2073942Test https://biblio.ugent.be/publication/2073942/file/4335904Test |
| حقوق: | No license (in copyright) ; info:eu-repo/semantics/restrictedAccess |
| رقم الانضمام: | edsbas.E2DFAD50 |
| قاعدة البيانات: | BASE |
| ردمك: | 9789059895089 9059895088 |
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