Wolfgang Stümer

Handlungsoptionen für den Klimaschutz in der deutschen Agrar- und Forstwirtschaft

Gegenstand des Berichts ist die Rolle der UNFCCC-Quellgruppen Landwirtschaft sowie Landnutzung, Landnutzungsanderung und Forstwirtschaft (land use, land use change and forestry, LULUCF) bei der kunftigen Reduzierung von THG-Emissionen in Deutschland. In Kapitel 2 werden Stand und Entwicklung der THG-Emissionen dieser Quellgruppen anhand der Daten aus der nationalen Emissionsberichterstattung dargestellt. Die Weiterentwicklung der klimaschutzpolitischen Rahmenbedingungen wird in Kapitel 3 nachgezeichnet, wobei die fur Landwirtschaft und LULUCF relevanten Aspekte naher beleuchtet werden. Aufbauend auf einen Uberblick uber klimaschutzpolitische Aktivitaten von Bund und Landern in der Land-, Forst- und Holzwirtschaft (Kapitel 4) werden in Kapitel 5 konkrete Masnahmenoptionen beschrieben und bewertet. Der Bericht schliest mit Empfehlungen zur Umsetzung. Da fur den Forst- und Holzbereich bereits ausgearbeitete Strategien vorliegen, besteht Handlungsbedarf besonders bezuglich der Frage, wie die Landwirtschaft kunftig in nationale Klimaschutzziele eingebunden werden soll.

Comparison of calculation methods for estimating annual carbon stock change in German forests under forest management in the German greenhouse gas inventory

BackgroundThe German greenhouse gas inventory in the land use change sector strongly depends on national forest inventory data. As these data were collected periodically 1987, 2002, 2008 and 2012, the time series on emissions show several “jumps” due to biomass stock change, especially between 2001 and 2002 and between 2007 and 2008 while within the periods the emissions seem to be constant due to the application of periodical average emission factors. This does not reflect inter-annual variability in the time series, which would be assumed as the drivers for the carbon stock changes fluctuate between the years. Therefore additional data, which is available on annual basis, should be introduced into the calculations of the emissions inventories in order to get more plausible time series.ResultsThis article explores the possibility of introducing an annual rather than periodical approach to calculating emission factors with the given data and thus smoothing the trajectory of time series for emissions from forest biomass. Two approaches are introduced to estimate annual changes derived from periodic data: the so-called logging factor method and the growth factor method. The logging factor method incorporates annual logging data to project annual values from periodic values. This is less complex to implement than the growth factor method, which additionally adds growth data into the calculations.ConclusionCalculation of the input variables is based on sound statistical methodologies and periodically collected data that cannot be altered. Thus a discontinuous trajectory of the emissions over time remains, even after the adjustments. It is intended to adopt this approach in the German greenhouse gas reporting in order to meet the request for annually adjusted values.