Global ETD Search

1	Quantification Of Gross Nitrogen Transformation Rates Within A Conventional Potato Rotation Using Stable Isotopes Stiles, Kyra 06 December 2012 (has links) This study used the isotope pool dilution method to estimate gross rates of mineralization, nitrification, NH4+ and NO3- consumption, and denitrification emissions over two growing seasons within a conventional barley-red clover-potato crop rotation on Prince Edward Island. Gross rates within the 2010 season were, in most cases, not significant across crop species or sampling date. In comparison, gross nitrification, NH4+ consumption, and NO3- consumption rates in 2011 were greatest within the potato crop following planting and hilling. However, rates were highly variable within both seasons. Error analysis indicated that variation in soil mineral nitrogen concentrations between duplicate cores was the greatest source of error. The use of the isotope pool dilution method to estimate gross nitrogen transformation rates using intact cores was not viable within this production system due to high and variable soil mineral nitrogen concentrations, particularly following fertilizer application. nitrogen stable isotope potato soil pool dilution soil mineral nitrogen
2	Gross N2O fluxes across soil-atmosphere interface and stem N2O emissions from temperate forests Wen, Yuan 07 April 2017 (has links) No description available. 634 15N2O pool dilution gross N2O emission gross N2O uptake temperate forests stem N2O emission denitrification Forstwirtschaft (PPN621305413)
3	Internal Nitrogen Cycling in Tropical Forest Soils / Bodeninterne Stickstoffkreisläufe in tropischen Regenwäldern Arnold, Julia 10 December 2008 (has links) No description available. 500 Naturwissenschaften Forest Sciences and Forest Ecology Stickstoffkreislauf tropischer Regenwald 15N Verduennungsmethode Stickstoffdeposition Brutto-N-Mineralisierung N cycle nitrogen tropical forest 15N pool dilution N deposition gross N mineralization 43.47 YPA 000: Forstliche Bodenkunde
4	Soil Carbon Dioxide dynamics and Nitrogen cycling in an Eastern Amazonian Rainforest, Caxiuana, Brazil / Boden Kohlendioxyd-Dynamik und Stickstoffkreislauf in einem Regenwald in Ostamazonien Caxiuana, Brasilien Doff Sotta, Eleneide 11 July 2006 (has links) No description available. 500 Naturwissenschaften Forest Sciences and Forest Ecology Brasilien Kohlenstoffkreislauf CO<sub>2</sub> Streufall Nettoprimärproduction Bodenrespiration Bodentemperatur Bodenwassergehalt räumliche Variabilität Topographie Trockenheit tropischer Regenwald Stickstoffkreislauf Bodenart <sup>15</sup>N Stickstoffisotope Brazil carbon cycle CO<sub>2</sub> litter NPP soil respiration soil temperature soil water content spatial variation topography drought tropical forest nitrogen cycling soil texture <sup>15</sup>N pool dilution Umweltforschung Umweltschutz

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