255 research outputs found
Diurnal and seasonal variation of δ¹³C and δ¹⁸O of carbon dioxide in a Norway spruce forest measured with a tunable diode laser absorption spectrometer
Impact of climate change on N-cycle and greenhouse gas fluxes in alpine grassland ecosystems: an in situ climate change experiment
Pure stands of temperate forest tree species modify soil respiration and N turnover
International audienceThe effects of five different tree species common in the temperate zone, i.e. beech (Fagus sylvatica L.), pedunculate oak (Quercus robur L.), Norway spruce (Picea abies [L.] Karst), Japanese larch (Larix leptolepis [Sichold and Zucc.] Gordon) and mountain pine (Pinus mugo Turra), on soil respiration, gross N mineralization and gross nitrification rates were investigated. Soils were sampled in spring and summer 2002 at a forest trial in Western Jutland, Denmark, where pure stands of the five tree species of the same age were growing on the same soil. Soil respiration, gross rates of N mineralization and nitrification were significantly higher in the organic layers than in the Ah horizons for all tree species and both sampling dates. In summer (July), the highest rates of soil respiration, gross N mineralization and gross nitrification were found in the organic layer under spruce, followed by beech > larch > oak > pine. In spring (April), these rates were also higher under spruce compared to the other tree species, but were significantly lower than in summer. For the Ah horizons no clear seasonal trend was observed for any of the processes examined. A linear relationship between soil respiration and gross N mineralization (r2=0.77), gross N mineralization and gross nitrification rates (r2=0.72), and between soil respiration and gross nitrification (r2=0.81) was found. The results obtained underline the importance of considering the effect of forest type on soil C and N transformations
Soil-atmosphere N₂O exchange in natural savannah, non-fertilized and fertilized agricultural land in Burkina Faso (W.Africa)
What can we learn from long-term measurements of soil-atmosphere exchange of trace gases? The Höglwald as a case study
Impact of clear-cutting and selective cutting on the soil-atmosphere greenhouse gas exchange of an N-saturated spruce forest in the course of its conversion to a mixed deciduous forest
Diurnal and seasonal variation of ¹³C and ¹⁸O of carbon dioxide in a Norway spruce forest measured with a tunable diode laser absorption spectrometer
Mikrobielle Stickstoff-Umwetzungen in Mini-Lysimetern in einem in situ-Klimaänderungsexperiment (FORKAST)
Soil-atmosphere exchange of N₂O, NO, CH₄ and CO₂ in natural savannah and savannah converted to agricultural land in Burkina Faso (W.Africa)
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