Olschewski, Roland

[["dc.bibliographiccitation.firstpage","227"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","New Forests"],["dc.bibliographiccitation.lastpage","240"],["dc.bibliographiccitation.volume","37"],["dc.contributor.author","Derwisch, Sebastian"],["dc.contributor.author","Schwendenmann, Luitgard"],["dc.contributor.author","Olschewski, Roland"],["dc.contributor.author","Hölscher, Dirk"],["dc.date.accessioned","2017-09-07T11:45:39Z"],["dc.date.available","2017-09-07T11:45:39Z"],["dc.date.issued","2009"],["dc.description.abstract","Tropical tree plantations may play an important role in mitigating CO2 emissions through their potential to capture and sequester carbon from the atmosphere. The Clean Development Mechanism (CDM) as well as voluntary initiatives provide economic incentives for afforestation and reforestation efforts through the generation and sale of carbon credits. The objectives of our study were to measure the carbon (C) storage potential of 1, 2 and 10-years old Tectona grandis plantations in the province of Chiriquí, Western Panama and to calculate the monetary value of aboveground C storage if sold as Certified Emission Reduction (CER) carbon credits. The average aboveground C storage ranged from 2.9 Mg C ha−1 in the 1-year-old plantations to 40.7 Mg C ha−1 in the 10-year-old plantations. Using regression analysis we estimated the potential aboveground C storage of the teak plantation over a 20 year rotation period. The CO2-storage over this period amounted to 191.1 Mg CO2 ha−1. The discounted revenues that could be obtained by issuance of carbon credits during a 20 year rotation period were about US60 for temporary CER and US60 for long-term CER, and thus, contribute to a minor extent (1%) to overall revenues, only."],["dc.identifier.doi","10.1007/s11056-008-9119-2"],["dc.identifier.gro","3149054"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6809"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5697"],["dc.language.iso","en"],["dc.notes.intern","Hoelscher Crossref import"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","0169-4286"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Estimation and economic evaluation of aboveground carbon storage of Tectona grandis plantations in Western Panama"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","109"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Agroforestry Systems"],["dc.bibliographiccitation.lastpage","114"],["dc.bibliographiccitation.volume","73"],["dc.contributor.author","Veddeler, Dorthe"],["dc.contributor.author","Olschewski, Roland"],["dc.contributor.author","Tscharntke, Teja"],["dc.contributor.author","Klein, Alexandra-Maria"],["dc.date.accessioned","2017-09-07T11:50:09Z"],["dc.date.available","2017-09-07T11:50:09Z"],["dc.date.issued","2008"],["dc.description.abstract","Fruit set and quality of highland coffee (Coffea arabica) have been experimentally shown to be higher with bee-mediated or manual pollen supplementation than with autonomous self-pollination. Based on extrapolation from these small-scale experiments, very substantial monetary values for the pollination service have recently been suggested. However, previous research has not included direct measurement of coffee yield at a farm level in relation to pollinator activity, testing if pollinators are not only limiting fruit set and quality, but also coffee yield and farm profit. The extrapolations from small-scale experiments may be subject to error, because resource reallocation during fruit development, associated with enhanced pollination, was neglected, and many studies were restricted to a single coffee farm, limiting the validity of extrapolation. Here, we investigate the relationship between coffee yield and the community of coffee flower-visiting bees on 21 farms in Ecuador, where coffee is grown under tree shade. Our data show, for the first time on a farm-scale, that coffee yield was positively related to the density of non-managed, social flower-visiting bees per coffee shrub, but not to the number of inflorescences per shrub. Our data revealed that a fourfold increase in bee density was associated with an 80% increase in yield and an 800% increase in net revenues. Consequently, in our study higher yield associated with increased pollination generated higher revenues per hectare, so that farm profit was higher when bees were abundant."],["dc.identifier.doi","10.1007/s10457-008-9120-y"],["dc.identifier.gro","3149852"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6786"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6556"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.relation.issn","0167-4366"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.subject","Coffea arabica; Ecosystem service; Farm-wide yield; Honey bee; Pollination; Stingless bees"],["dc.title","The contribution of non-managed social bees to coffee production: new economic insights based on farm-scale yield data"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]