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The break-up of the Soviet Union in 1991 triggered cropland abandonment on a continental scale, which in turn ledto carbon accumulation on abandoned land across Eurasia. Previous studies have estimated carbon accumulationrates across Russia based on large-scale modelling. Studies that assess carbon sequestration on abandoned land basedon robust field sampling are rare. We investigated soil organic carbon (SOC) stocks using a randomized samplingdesign along a climatic gradient from forest steppe to Sub-Taiga in Western Siberia (Tyumen Province). In total, SOCcontents were sampled on 470 plots across different soil and land-use types. The effect of land use on changes in SOCstock was evaluated, and carbon sequestration rates were calculated for different age stages of abandoned cropland.While land-use type had an effect on carbon accumulation in the topsoil (0–5 cm), no independent land-use effectswere found for deeper SOC stocks. Topsoil carbon stocks of grasslands and forests were significantly higher thanthose of soils managed for crops and under abandoned cropland. SOC increased significantly with time sinceabandonment. The average carbon sequestration rate for soils of abandoned cropland was 0.66 Mg C ha1yr1(1–20 years old, 0–5 cm soil depth), which is at the lower end of published estimates for Russia and Siberia. Therewas a tendency towards SOC saturation on abandoned land as sequestration rates were much higher for recentlyabandoned (1–10 years old, 1.04 Mg C ha1yr1) compared to earlier abandoned crop fields (11–20 years old,0.26 Mg C ha1yr1). Our study confirms the global significance of abandoned cropland in Russia for carbonsequestration. Our findings also suggest that robust regional surveys based on a large number of samples advancemodel-based continent-wide SOC prediction.
Das Forschungsprojekt „Urbane Interventionen“ war ein Pilotprojekt im Rahmen der Nationalen Stadtentwicklungspolitik und zielte darauf ab, Impulse für eine bürgergetragene Stadtentwicklung in den Stadtteilen Haste, Dodesheide und Wüste zu setzen. Dabei wurden die StadtteilbewohnerInnen aktiv in den Prozess involviert und bekamen Möglichkeitsräume angeboten, im eigenen Umfeld aktiv zu werden. Das interdisziplinäre Projektteam der Hochschule Osnabrück arbeitete mit der Stadt Osnabrück sowie lokalen Vereinen und Organisationen zusammen.
Den Auftakt bildeten zwei Stadtteilwerkstätten in den Stadtteilen Haste und Wüste. Im Stadtteil Dodesheide begannen die Aktivitäten 2016 mit einem „Stadtteilcafé“. Im Rahmen eines eintägigen Workshops sammelte das Hochschulteam gemeinsam mit den TeilnehmerInnen Ideen für eine soziale und lebenswerte Stadtteilentwicklung. Die vorliegende Dokumentation stellt die Ideen und Ergebnisse des Ideenworkshops dar und informiert über die Ziele des Hochschulprojekts „Urbane Interventionen“.