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Bargsten, Anika ; Falge, Eva ; Pritsch, Karin ; Huwe, Bernd ; Meixner, Franz X.:
Laboratory measurements of nitric oxide release from forest soil with a thick organic layer under different understory types.
In: Biogeosciences.
Bd. 7
(2010)
Heft 5
.
- S. 1425-1441.
ISSN 1726-4189
DOI: https://doi.org/10.5194/bg-7-1425-2010
Abstract
Nitric oxide (NO) plays an important role in thephotochemistry of the troposphere. NO from soil contributes up to 40% to the global budget of atmospheric NO. Soil NO emissions are primarily caused by biological activity (nitrification and denitrification), that occurs in the uppermost centimeter of the soil, a soil region often characterized by high contents of organic material. Most studies of NO emission potentials to date have investigated mineral soil layers. In our study we sampled soil organic matter under different understories (moss, grass, spruce and blueberries) in a humid mountainous Norway spruce forest plantation in the Fichtelgebirge (Germany). We performed laboratory incubation andflushing experiments using a customized chamber techniqueto determine the response of net potential NO flux to physicaland chemical soil conditions (water content and temperature,bulk density, particle density, pH, C/N ratio, organic C, soilammonium, soil nitrate). Net potential NO fluxes (in termsof mass of N) from soil samples taken under different understoriesranged from 1.7–9.8 ngm−2 s−1 (soil sampled under grass and moss cover), 55.4–59.3 ngm−2 s−1 (soil sampled under spruce cover), and 43.7–114.6 ngm−2 s−1 (soil sampledunder blueberry cover) at optimum water content and a soil temperature of 10 C. The water content for optimum net potential NO flux ranged between 0.76 and 0.8 gravimetric soil moisture for moss covered soils, between 1.0 and1.1 for grass covered soils, 1.1 and 1.2 for spruce covered soils, and 1.3 and 1.9 for blueberry covered soils. Effects of soil physical and chemical characteristics on net potential NO flux were statistically significant (0.01 probabilitylevel) only for NH+4 . Therefore, as an alternative explanationfor the differences in soil biogenic NO emission we considermore biological factors like understory vegetation type,amount of roots, and degree of mycorrhization; they have thepotential to explain the observed differences of net potentialNO fluxes.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER83787
BAYCEER83956 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenphysik Forschungseinrichtungen Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 11 Sep 2015 06:32 |
| Letzte Änderung: | 14 Apr 2018 02:48 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/19077 |