N2O-Emissions of Forest Soils in Northern Germany: Seasonal Variability and Influencing Parameters

Mogge, Bernhard; Heinemeyer, Otto; Kaiser, Ernst‐August; Munch, J. C.

doi:10.1007/978-94-011-5450-5_96

Cited by 2 publications

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“…Augustin et al 1998;Röver et al 1998). O-emissions are related to the course of temperature and could be dependent on several factors such as groundwater level, water-filled pore space, soil pH, soil nitrate content, soil texture, and soil structure (Mogge et al 1996;Flessa et al 1998;Röver et al 1998;Teepe et al 2001Teepe et al , 2004. However, the frost-induced emissions we measured at a couple of sites are small compared to the total annual N 2 O emission budget from the sandy soil of the experimental field.…”

Section: Resultsmentioning

confidence: 81%

Nitrogen conversion and nitrous oxide hot spots in energy crop cultivation

Hellebrand¹,

Scholz²,

Kern³

2008

Res. Agric. Eng.

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Since 1999, nitrous oxide (N 2 O) soil emissions from sites cultivated with energy plants have been measured by gas chromatography and gas flux chambers in experimental fields. The main aim of this study was the nitrogen conversion factor and its variability for sandy soils under climatic conditions of Central Europe. Annual plants (hemp, rape, rye, sorghum, triticale) and perennial plants (grass, perennial rye, poplar, willow) were fertilised with three different levels of nitrogen (150 kg N/ha/year, 75 kg N/ha/year, and none). The annual nitrogen conversion factors were derived from the annual mean differences between the fertilised sites and non-fertilised control sites. The mean nitrogen conversion factor for the non-cultivated soils was lower (perennial crops: 0.4%) than that for the regularly cultivated soils (annual crops: 0.9%). Few times, enhanced N 2 O emission spots with maxima above 1000 µg N 2 O/m 2 /h, lasting for several weeks, were observed in the course of measurements. The influence of these local peak emissions on the nitrogen conversion factor is discussed.

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