Schwendenmann, Luitgard

[["dc.bibliographiccitation.firstpage","1053"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Biology and Fertility of Soils"],["dc.bibliographiccitation.lastpage","1062"],["dc.bibliographiccitation.volume","44"],["dc.contributor.author","Schwendenmann, Luitgard"],["dc.contributor.author","Pendall, Elise"],["dc.date.accessioned","2018-11-07T11:11:06Z"],["dc.date.available","2018-11-07T11:11:06Z"],["dc.date.issued","2008"],["dc.description.abstract","Understanding soil organic carbon (SOC) responses to land-use changes requires knowledge of the sizes and mean residence times (MRT) of specific identifiable SOC pools over a range of decomposability. We examined pool sizes and kinetics of active and slow pool carbon (C) for tropical forest and grassland ecosystems on Barro Colorado Island, Panama, using long-term incubations (180 days) of soil and stable C isotopes. Chemical fractionation (acid hydrolysis) was applied to assess the magnitude of non-hydrolysable pool C (NHC). Incubation revealed that both grassland and forest soil contained a small proportion of active pool C (< 1%), with MRT of similar to 6 days. Forest and grassland soil apparently did not differ considerably with respect to their labile pool substrate quality. The MRT of slow pool C in the upper soil layer (0-10 cm) did not differ between forest and grassland, and was approximately 15 years. In contrast, changes in vegetation cover resulted in significantly shorter MRT of slow pool C under grassland (29 years) as compared to forest (53 years) in the subsoil (30-40 cm). The faster slow pool turnover rate is probably associated with a loss of 30% total C in grassland subsoil compared to the forest. The NHC expressed as a percentage of total C varied between 54% and 64% in the surface soil and decreased with depth to similar to 30%. Grassland NHC had considerably longer MRTs (120 to 320 years) as compared to slow pool C. However, the functional significance of the NHC pool is not clear, indicating that this approach must be applied cautiously."],["dc.identifier.doi","10.1007/s00374-008-0294-2"],["dc.identifier.isi","000258757900006"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?goescholar/3513"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/53356"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0178-2762"],["dc.title","Response of soil organic matter dynamics to conversion from tropical forest to grassland as determined by long-term incubation"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","3465"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Biogeosciences"],["dc.bibliographiccitation.lastpage","3474"],["dc.bibliographiccitation.volume","9"],["dc.contributor.author","Meißner, M."],["dc.contributor.author","Köhler, M."],["dc.contributor.author","Schwendenmann, L."],["dc.contributor.author","Hölscher, Dirk"],["dc.date.accessioned","2017-09-07T11:45:39Z"],["dc.date.available","2017-09-07T11:45:39Z"],["dc.date.issued","2012"],["dc.description.abstract","Complementary resource use is considered an important mechanism in the study of biodiversity effects. Here we explore how species identity, species mixture and tree size influence the vertical partitioning of soil water among canopy trees during a soil desiccation period. In the Hainich Forest, Germany, the species Fagus sylvatica, Tilia sp. and Fraxinus excelsior were studied in single- and three-species mixed clusters, each consisting of three co-dominant trees situated within a larger mixed forest stand. Vertical soil water uptake depth was assessed by analyzing the hydrogen stable isotope composition (deuterium, D) of water from depth intervals throughout the soil profile and in tree xylem water. For single species clusters, a mixing model suggested that Fagus distinctively drew water from soil depths of 0.3–0.5 m, Tilia from 0.3–0.5m and 0.5–0.7m and Fraxinus mainly used water from 0.5–0.7 m. In mixed clusters, the uptake patterns of Fagus and Tilia were similar to those of the singlespecies clusters (mainly uptake form 0.3–0.5 m), but Fraxinus showed a different uptake pattern. Fraxinus in mixture had a somewhat homogenously distributed uptake over the soil depths 0.2–0.7 m. For single species clusters, there was no correlation between main soil water uptake depth and tree diameter, irrespective of variations in tree size. In contrast, for mixed clusters there was a significant decrease in the main uptake depth with increasing tree size (P < 0.001, R2 adj = 0.73), irrespective of species mix. In consequence, soil water partitioning was strongest where species were mixed and tree size varied. We further analyzed whether single and mixed-species clusters differed in the level of water uptake, e.g. due to complementarity, but our soil water budgeting did not indicate any such differences. A possible explanation might be that the volume of water used is predominantly governed by properties at the stand level, such as aerodynamic roughness, rather than by processes acting at the meter scale between neighbouring trees. With respect to application, we assume that the upcoming close-to-nature forestry approach for the area, which fosters mixed stands of heterogonous diameters, may result in enhanced complementarity in soil water uptake among canopy trees."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2012"],["dc.identifier.doi","10.5194/bg-9-3465-2012"],["dc.identifier.gro","3149053"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/8398"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5696"],["dc.language.iso","en"],["dc.notes.intern","Hoelscher Crossref import"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","1726-4189"],["dc.rights.access","openAccess"],["dc.title","Partitioning of soil water among canopy trees during a soil desiccation period in a temperate mixed forest"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["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","171"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Agroforestry Systems"],["dc.bibliographiccitation.lastpage","187"],["dc.bibliographiccitation.volume","79"],["dc.contributor.author","Moser, G."],["dc.contributor.author","Leuschner, C."],["dc.contributor.author","Hertel, D."],["dc.contributor.author","Hölscher, D."],["dc.contributor.author","Köhler, M."],["dc.contributor.author","Leitner, D."],["dc.contributor.author","Michalzik, B."],["dc.contributor.author","Prihastanti, E."],["dc.contributor.author","Tjitrosemito, S."],["dc.contributor.author","Schwendenmann, L."],["dc.date.accessioned","2017-09-07T11:45:34Z"],["dc.date.available","2017-09-07T11:45:34Z"],["dc.date.issued","2010"],["dc.description.abstract","In South-east Asia, ENSO-related droughts represent irregularly occurring hazards for agroforestry systems containing cocoa which are predicted to increase in severity with expected climate warming. To characterize the drought response of mature cocoa trees, we conducted the Sulawesi Throughfall Displacement Experiment in a shaded (Gliricidia sepium) cocoa agroforestry system in Central Sulawesi, Indonesia. Three large sub-canopy roofs were installed to reduce throughfall by about 80% over a 13-month period to test the hypotheses that (i) cocoa trees are sensitive to drought due to their shallow fine root system, and (ii) bean yield is more sensitive to drought than leaf or stem growth. As 83% of fine root (diameter <2 mm) and 86% of coarse root biomass (>2 mm) was located in the upper 40 cm of the soil, the cocoa trees examined had a very shallow root system. Cocoa and Gliricidia differed in their vertical rooting patterns, thereby reducing competition for water. Despite being exposed for several months to soil water contents close to the conventional wilting point, cocoa trees showed no significant decreases in leaf biomass, stem and branch wood production or fine root biomass. Possible causes are active osmotic adjustment in roots, mitigation of drought stress by shading from Gliricidia or other factors. By contrast, production of cocoa beans was significantly reduced in the roof plots, supporting reports of substantial reductions in bean yields during ENSO-related drought events in the region. We conclude that cocoa possesses traits related to drought tolerance which enable it to maintain biomass production during extended dry periods, whereas bean yield appears to be particularly drought sensitive."],["dc.identifier.doi","10.1007/s10457-010-9303-1"],["dc.identifier.gro","3149046"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/4251"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5690"],["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","0167-4366"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Response of cocoa trees (Theobroma cacao) to a 13-month desiccation period in Sulawesi, Indonesia"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","73"],["dc.bibliographiccitation.issue","1-3"],["dc.bibliographiccitation.journal","Biogeochemistry"],["dc.bibliographiccitation.lastpage","85"],["dc.bibliographiccitation.volume","96"],["dc.contributor.author","Oxmann, Julian F."],["dc.contributor.author","Schwendenmann, Luitgard"],["dc.contributor.author","Lara, Ruben Jose"],["dc.date.accessioned","2018-11-07T11:21:17Z"],["dc.date.available","2018-11-07T11:21:17Z"],["dc.date.issued","2009"],["dc.description.abstract","Sediment reduction is frequently proposed to increase available phosphorus (P) but several studies found also decreases. Another important factor for P liberation is the pH. We investigated the relative importance of Eh and pH on P cycling in reforested mangroves. Sediment P compounds, pH and Eh were analysed over depth along five transects of two areas in the Saigon River Delta and compared with leaf P levels. A three-dimensional spatial approach was used to investigate pH and Eh effects on P compound distribution at different sediment depth and locate layers of predominant P uptake. Along an inundation gradient, submergence durations of 254 to 2 days per year caused a large Eh gradient within the top 20 cm, whereas Eh response was small within 20-45 cm depth. At individual layers, a correlation between Eh and Al/Fe-P was only found in the upper depth interval (0-20 cm). No significant effect of Eh or Al/Fe-P on Morgan-P (available P) was detected. Minor effects on P composition changes by the Eh were caused through generally strongly reduced sediment at deeper layers (> 20 cm). In contrast, pH variations produced extreme differences in both, Ca-P and available P content at layers of apparently predominant P uptake (> 20 cm). As available P was correlated with Ca-P (p < 0.001), leaf P (p < 0.001) and pH (non linear correlation) it is likely that the pH sensitive Ca-P fraction is a more effective source for mangrove tree growth than Al/Fe-P. The predominant pH effect on P uptake within these reforested mangroves differs from a proposed reduction-governed P cycling in wetlands."],["dc.description.sponsorship","German Research Foundation"],["dc.identifier.doi","10.1007/s10533-009-9345-5"],["dc.identifier.isi","000270280500005"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?goescholar/3579"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/55739"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1573-515X"],["dc.relation.issn","0168-2563"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Interactions among phosphorus, pH and Eh in reforested mangroves, Vietnam: a three-dimensional spatial analysis"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","225"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Plant and Soil"],["dc.bibliographiccitation.lastpage","241"],["dc.bibliographiccitation.volume","326"],["dc.contributor.author","Oxmann, Julian F."],["dc.contributor.author","Pham, Q. H."],["dc.contributor.author","Schwendenmann, Luitgard"],["dc.contributor.author","Stellman, J. M."],["dc.contributor.author","Lara, Ruben Jose"],["dc.date.accessioned","2018-11-07T08:48:28Z"],["dc.date.available","2018-11-07T08:48:28Z"],["dc.date.issued","2010"],["dc.description.abstract","Sediment physicochemical properties most likely control the reforestation success on degraded mangrove sites. Our objectives were (1) to determine the nutritional status of reforested mangrove stands; (2) to investigate the effects of the redox potential (Eh) and pH on phosphorus (P) and nitrogen (N) cycling; and (3) to assess the effect of pH on P speciation. Five transects were studied in replanted stands of the Saigon River Delta, Vietnam. Spatial gradients of sediment Eh and pH were affected by the tidal regime and pyrite oxidation. Sediment Al/Fe-P correlated with Eh or pH, depending on the sediment layer, whereas Ca-P, Morgan-P (available P) and leaf P were influenced by the pH. The highest concentrations of Al/Fe-P were recorded at pH 6.5 probably due to adsorption effects. Sediment Ca-P increased strongly at pH below 4 and above 6, reflecting the different pH-dependent solubilities of individual Ca-P mineral species as shown by a newly developed method for P species quantification. A strong increase of available P and leaf P above pH 6, and positive correlations of available P vs Ca-P (P < 0.001) and leaf P (P = 0.004) suggest that the Morgan's reagent for available P determination solubilizes mainly thermodynamically less stable Ca-P compounds, which seem to fuel P plant uptake. Since foliar and sediment N:P ratios were influenced mainly by pH, shifts in pH likely cause limitation transitions. Overall, sediment pH rather than Eh was found to control the nutrient status."],["dc.description.sponsorship","German - Vietnamese collaboration; German Research Foundation"],["dc.identifier.doi","10.1007/s11104-009-0003-4"],["dc.identifier.isi","000272850200018"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6812"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21216"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1573-5036"],["dc.relation.issn","0032-079X"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Mangrove reforestation in Vietnam: the effect of sediment physicochemical properties on nutrient cycling"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]