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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 ; 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. Vol. 7 (2010) Issue 5 . - pp. 1425-1441.
ISSN 1726-4189
DOI: https://doi.org/10.5194/bg-7-1425-2010

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER83787
BAYCEER83956
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Physics
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 11 Sep 2015 06:32
Last Modified: 14 Apr 2018 02:48
URI: https://eref.uni-bayreuth.de/id/eprint/19077