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Laboratory measurements of nitric oxide release from forest soil with a thick organic layer under different understory types

Title data

Bargsten, Anika ; Falge, Eva ; 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 Discussions. Vol. 7 (2010) Issue 5 . - 203–250.
ISSN 1810-6285
DOI: https://doi.org/10.5194/bgd-7-203-2010

Abstract in another language

Nitric oxide (NO) plays an important role in the photochemistry of the troposphere. NO from soil contributes up to 40% to the global budget of atmospheric NO. Soil NO emissionsare primarily caused by biological activity (nitrification and denitrification), that occurs in the uppermost centimetres of the soil, a soil region often characterized by high contents of organic material. Most studies of NO emission potentials to date haveinvestigated 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 and fumigation experiments using a customized chamber technique to determine the response of net potential NO flux to physical and chemical soil conditions (water content and temperature, bulk density, particle density, pH, C/N ratio,organic C, soil ammonium, soil nitrate). Net potential NO fluxes (in terms of mass of N) from soils of different understories ranged from 1.7–9.8 ngm−2 s−1 (grass and moss), 55.4–59.3 ngm−2 s−1 (spruce), and 43.7–114.6 ngm−2 s−1 (blueberry) at optimum watercontent 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, between 1.0 and 1.1 for grass, 1.1 and 1.2 for spruce, and 1.3 and 1.9 for blueberries. Effects of soil physical and chemical characteristics on net potential NO flux were statistically significant(0.01 probability level) only for NH+4. Therefore, the effects of biogenic factors like understory type, amount of roots, and degree of mycorrhization on soil biogenic NO emission are discussed; they have the potential to explain the observed different of net potential NO fluxes. Quantification of NO emissions from the upmost soil layer is therefore an important step to quantify soil NO emissions in ecosystems with substantial organic soil horizons.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER78708
Institutions of the University: Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 07 Aug 2015 06:59
Last Modified: 14 Apr 2018 02:48
URI: https://eref.uni-bayreuth.de/id/eprint/17688