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Our daily food consumption is slowly but surely turning into the largest environmental threat. The agricultural sector consumes 70% of the water used by humankind. The production of meat consumes enormous amounts of water compared to plants. Innovations in the area of food production are lately summarized as AgTech, agricultural technology. This encompasses all sorts of areas, ranging from drone-controlled tractors to printed hamburgers. Specifically the challenge of making use of the limited areas available in cities and maximizing crop yields has seen a recent boom in novel approaches – and quite a bit of investor finance.
Human-induced environmental change represents one of the major challenges of current and future generations. To evaluate the anthropogenic impacts on the biosphere, the concept of Planetary Boundaries was developed, indicating that in case of four out of nine environmental indicators a transgression of corresponding boundaries has already taken place: Biodiversity loss, climate change, land-system change, and biogeochemical flows. Further, paleoclimate research has shown that the earth´s environment has been relatively stable for the last 12,000 years. Researchers assume that this, in geological terms, very short period – called Holocene – is now already again replaced by a new geological era: the Anthropocene, due to the tremendous impacts humans had on earth.
In October 2015, the Cluster of Excellence 'Image Knowledge Gestaltung. An Interdisciplinary Laboratory' at Humboldt Universität zu Berlin staged a symposium entitled Science meets Comics. Academics from various disciplines converged along with artists from all over the world in order to discuss the future of global nutrition – and the medium of the comic strip as a communication tool for the complex issues in this field. The open two-day symposium was followed by a closed, three-day workshop wherein the artists and cluster members took up the issues raised at the symposium and worked on possible directions for the future.
The Global Irrigation Model (GIM) is used within the framework of the global hydrological model WaterGAP to calculate monthly irrigation crop water use. Results on a 0.5 degrees grid include, consumption (ICU) and, via division by irrigation efficiencies, water withdrawal (IWU). The model distinguishes up to two cropping periods of rice and non-rice crops, each grown for 150 days, using a grid of area equipped for irrigation (AEI). Historical development of AEI and fraction of area actually irrigated (AAI) was previously considered via scaling of cell-specific results with country-specific factors for each year. In this study, GIM was adapted to use the new Historical Irrigation Data set (HID) with cell-specific AEI for 14 time slices between 1900 and 2005. AEI grids were temporally interpolated, and using the optional grid of AAI/AEI, results for years 1901-2014 were generated (runs "HID-ACT"). Thus, new installation or abandonment of irrigation infrastructure in new grid cells can be represented in a spatially explicit manner. For evaluated years 1910, 1960, 1995, and 2005, ICU from HID-ACT was superior to country-specific scaled results (run "HID-ACTHIST") in representing historical development of the spatial pattern. Compared to US state-level reference data, spatial patterns were better, while country totals were not always better. For calculating the cropping periods, 30-years climate means are needed, the choice of which is relevant. Four chosen periods before 1981-2010 all resulted in considerable, pertaining changes of ICU spatial pattern, and various percent changes in country totals. This might be because of already present climate change.
Erfahrungen aus einer transdisziplinär angeleiteten Serie von Stakeholder-Workshops zur nachhaltigen Klima-Adaption von mitteleuropäischen Wirtschaftswäldern werden vorgestellt und hinsichtlich der Baumartenwahl, der Risikoreduktion und der Segregation von Funktionen ausgewertet. Eine vorhergehende Diskursfeldanalyse erleichterte sowohl die Auswahl der Stakeholder als auch die anschließende Analyse der durchgeführten Stakeholder-Prozesse. Die ausreichende Beteiligung gesellschaftlicher Anspruchsgruppen trägt nicht nur dazu bei, mögliche gesellschaftliche Anforderungen an die Klima-Adaption von Wirtschaftswäldern zu identifizieren, sondern sie auch so breit zu erörtern, dass damit deren Konkretisierung möglich wird. Soweit eine Atmosphäre gegenseitigen Lernens geschaffen werden kann, können dabei auch bekannte (oder vermutete) Frontstellungen aufgebrochen und Auswege zu einer konfliktvermeidenden Umsetzung (z.B. durch Aufbau einer fachübergreifende Begleitforschung) aufgezeigt werden.
Die Erdmandel (Cyperus esculentus L.) gehört zu den 10 wichtigsten Unkrautartender Welt. Sie ist eine ausdauernde Pflanze mit hohem vegetativen Reproduktionsvermögen. Da sie auf Grund ihrer Anspruchslosigkeit und ihrer widerstandsfähigen Sproßknollen nur sehr schwer und aufwendig zu bekämpfen ist, hat sie sich in fast allen Erdteilen verbreiten können. In den letzten Jahren hat sie auch in Deutschland als Unkraut Fuß gefaßt. Die Verbreitung der Erdmandel im Raum Damme (Kreis Vechta) wird untersucht und die Ursachen der Ausbreitung werden diskutiert. Die enormen Ertragsverluste durch Cyperus esculentus machen eine Bekämpfung unumgänglich, daher werden die verschiedenen Verfahren vorgestellt, die zur Zeit in Erprobung sind.
Summary:
1) Three types of forest, evergreen seasonal forest, heath forest and Melaleuca swamp forest, were distinguished and studied in the vicinity of Cheko in southwestern Cambodia, where moist tropical climate with a pronounced dry season in three winter months prevails.
2) These three forest types respectively occupied deep latosol derived from sandstone, very sandy soil around the swamp forest, and deep deposit of silica sand with underground hardpan in shallow valleys.
3) Total plant biomass was estimated by the allometric method based on some 140 sample trees (DBH24.5 cm) which were felled in four sample plots (two 50 mX50 m plots in the evergreen seasonal forest, and each one 20 m x 50 m plot in the other two types). Biomass of ground vegetation was estimated separately by similar technique and clipping.
4) The biomass of evergreen seasonal forest was estimated as follows. Stem 215 ton/ha, branch 99 ton/ha, root 61 ton/ha, leaf 7.3 ton/ha, leaf area index 7.4 ha/ha, density of trees over 4.5 cm DBH 1,280/ha, relative basal area of Whole stand 3.19 o/oo.
5) The biomass of heath forest was as follows. Stem 111 ton/ha, branch 35 ton/ha·, root 19 ton/ha, leaf 7.7 ton/ha, leaf area index 7.1 ha/ha, tree density 2,570/ha, relative basal area 2.3 o/oo.
6) The biomass of M elaleuca swamp forest was as follows. Stem 7.4 ton/ha, branch 3.9 ton/ha, root 2.6 ton/ha, leaf 0.79 ton/ha, leaf area index 0.37, undergrowth of sedge 2.57 ton/ha, tree density 200/ha, relative basal area of trees 0.35 o/oo.
7) It was found that the biomass of small trees (4.5 cm>DBH>1 cm) and ground vegetation (4.5 cm <= DBH) was so unevenly distributed over the forest floor that a few hundred square meters of sample area would be needed for estimating them at a moderate level of statistical reliability.
8) The estimated biomass of the evergreen seasonal forest was compared with the data hitherto obtained in moist tropical forests of Cote d'Ivoire and Thailand. The forest of Cheko was found to have the biomass equivalent to other rain forests, but to be characterized by a specific DBH-tree height curve, a rather small leaf area index and a high value of leaf area/leaf weight ratio.