Wick, Barbara

[["dc.bibliographiccitation.firstpage","175"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Biogeosciences"],["dc.bibliographiccitation.lastpage","187"],["dc.bibliographiccitation.volume","2"],["dc.contributor.author","Wick, Barbara"],["dc.contributor.author","Veldkamp, Edzo"],["dc.contributor.author","Mello, W. Z. de"],["dc.contributor.author","Keller, M."],["dc.contributor.author","Crill, P."],["dc.date.accessioned","2017-09-07T11:54:55Z"],["dc.date.available","2017-09-07T11:54:55Z"],["dc.date.issued","2005"],["dc.description.abstract","We studied nitrous oxide (N2O) fluxes and soil nitrogen (N) cycling following forest conversion to pasture in the central Amazon near Santarém, Parö, Brazil. Two undisturbed forest sites and 27 pasture sites of 0.5 to 60 years were sampled once each during wet and dry seasons. In addition to soil-atmosphere fluxes of N2O we measured 27 soil chemical, soil microbiological and soil physical variables. Soil N2O fluxes were higher in the wet season than in the dry season. Fluxes of N2O from forest soils always exceeded fluxes from pasture soils and showed no consistent trend with pasture age. At our forest sites, nitrate was the dominant form of inorganic N both during wet and dry season. At our pasture sites nitrate generally dominated the inorganic N pools during the wet season and ammonium dominated during the dry season. Net mineralization and nitrification rates displayed large variations. During the dry season net immobilization of N was observed in some pastures. Compared to forest sites, young pasture sites (=2 years) had low microbial biomass N and protease activities. Protease activity and microbial biomass N peaked in pastures of intermediate age (4 to 8 years) followed by consistently lower values in older pasture (10 to 60 years). The C/N ratio of litter was low at the forest sites (~25) and rapidly increased with pasture age reaching values of 60-70 at pastures of 15 years and older. Nitrous oxide emissions at our sites were controlled by C and N availability and soil aeration. Fluxes of N2O were negatively correlated to leaf litter C/N ratio, NH4+-N and the ratio of NO3--N to the sum of NO3--N + NH4+-N (indicators of N availability), and methane fluxes and bulk density (indicators of soil aeration status) during the wet season. During the dry season fluxes of N2O were positively correlated to microbial biomass N, ß-glucosidase activity, total inorganic N stocks and NH4+-N. In our study region, pastures of all age emitted less N2O than old-growth forests, because of a progressive decline in N availability with pasture age combined with strongly anaerobic conditions in some pastures during the wet season."],["dc.format.mimetype","application/pdf"],["dc.identifier.doi","10.5194/bg-2-175-2005"],["dc.identifier.fs","31887"],["dc.identifier.gro","3150148"],["dc.identifier.ppn","571568653"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/4418"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6880"],["dc.language.iso","en"],["dc.notes.intern","Migrated from goescholar"],["dc.notes.status","zu prüfen"],["dc.relation.issn","1726-4189"],["dc.rights","Goescholar"],["dc.rights.access","openAccess"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.subject.ddc","577"],["dc.title","Nitrous oxide fluxes and nitrogen cycling along a pasture chronosequence in Central Amazonia, Brazil"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1226"],["dc.bibliographiccitation.issue","14"],["dc.bibliographiccitation.journal","Neurology"],["dc.bibliographiccitation.lastpage","1234"],["dc.bibliographiccitation.volume","81"],["dc.contributor.author","Mollenhauer, B."],["dc.contributor.author","Trautmann, E."],["dc.contributor.author","Sixel-Doring, F."],["dc.contributor.author","Wicke, T."],["dc.contributor.author","Ebentheuer, J."],["dc.contributor.author","Schaumburg, M."],["dc.contributor.author","Lang, E."],["dc.contributor.author","Focke, N. K."],["dc.contributor.author","Kumar, K. R."],["dc.contributor.author","Trenkwalder, C."],["dc.contributor.authorgroup","On behalf of the DeNoPa Study Group"],["dc.date.accessioned","2021-06-01T10:48:12Z"],["dc.date.available","2021-06-01T10:48:12Z"],["dc.date.issued","2013"],["dc.description.abstract","Objective: To determine nonmotor signs (NMS) and evaluate the utility of several diagnostic tools in patients with de novo Parkinson disease (PD). Methods: This is a large single-center study of the DeNoPa cohort, including frequency-matched healthy controls. This study covers motor signs, NMS, and a combination of diagnostic tests including olfactory testing, transcranial sonography of substantia nigra (TCS), and polysomnography (PSG). We report the frequency and characteristics of NMS and the outcomes of nonmotor tests at the time of diagnosis. Results: Cross-sectional analyses of baseline investigations identified significant differences in the NMS Questionnaire (NMSQuest) and the Scopa-AUT Gastrointestinal score in 159 drug-naive PD patients vs 110 controls. In addition, patients with PD showed reduced olfactory function, hyperechogenicity on TCS, and higher frequency of REM sleep behavior disorder (RBD). In exploring predictive markers, we found that the combination of several investigations, i.e., the NMSQuest, Scopa-AUT Gastrointestinal score, and Smell Identification Test reached an area under the receiver operating characteristic curve (AUC) of 0.913 (95% confidence interval [CI] 0.878-0.948). With the addition of serum cholesterol and mean heart rate values, the AUC value reached 0.919 (95% CI 886-0.953); when TCS and PSG were added, the AUC increased to 0.963 (95% CI 0.943-0.982). Conclusions: We show feasibility and utility of standardized data acquisition in a large, single-center cohort of patients with de novo PD and matched healthy controls. The baseline results from our prospective investigations reached a value of >0.9 sensitivity and specificity for biological markers when we added routine laboratory investigations and quantified nonmotor features including sleep."],["dc.identifier.doi","10.1212/WNL.0b013e3182a6cbd5"],["dc.identifier.isi","000330768200012"],["dc.identifier.pmid","23997153"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/85857"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-425"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Lippincott Williams & Wilkins"],["dc.relation.eissn","1526-632X"],["dc.relation.issn","0028-3878"],["dc.title","Nonmotor and diagnostic findings in subjects with de novo Parkinson disease of the DeNoPa cohort"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","195"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Plant and Soil"],["dc.bibliographiccitation.lastpage","205"],["dc.bibliographiccitation.volume","252"],["dc.contributor.author","Tiessen, Holm"],["dc.contributor.author","Menezes, RSC"],["dc.contributor.author","Salcedo, I. H."],["dc.contributor.author","Wick, B."],["dc.date.accessioned","2018-11-07T10:39:27Z"],["dc.date.available","2018-11-07T10:39:27Z"],["dc.date.issued","2003"],["dc.description.abstract","Planted silvo-pastoral systems are formed by sparing selected native trees when land is cleared for pasture establishment, or by planting selected species - often known agroforestry species - into the establishing pasture. Isolated trees within pastures and savannas are often associated with 'resource islands', characterized by higher fertility and organic matter levels under the tree canopies. We here examine the processes underlying the differences in fertility and organic matter in a buffel grass ( Cenchrus ciliaris L.) pasture that contained two tree species (Ziziphus joazeiro Mart., Spondias tuberosa Arruda Cam.) preserved from the native thorn forest and a planted agroforestry species (Prospois juliflora Swartz D. C). The objective is to distinguish effects of soil variability from those induced by the presence of trees or the planting of pasture. The delta(13)C signatures of the original ( largely C3) vegetation, the preserved and planted trees, and the planted C4 grass were used to distinguish the provenance of organic matter in the top soil (0 - 15 cm). This allowed the conclusion that all trees maintained C3 derived C at the original thorn forest level, while lower levels under pasture were due to mineralisation of organic matter. The net rates of forest-derived C loss under pasture varied with soil type amounting to between 25 and 50% in 13 years after pasture establishment. Only on Alfisol, C inputs from the pasture compensated for the C3-C losses. Analysis of organic and inorganic P fractions indicated Z. joazeiro and P. juliflora enriched the soil under their canopy with P, whereas S. tuberosa had no positive effect on fertility. A combination of ANOVA and spatial analysis and mapping was used to show vegetation effects."],["dc.identifier.doi","10.1023/A:1024762501920"],["dc.identifier.isi","000184191800002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/46048"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Kluwer Academic Publ"],["dc.relation.issn","0032-079X"],["dc.title","Organic matter transformations and soil fertility in a treed pasture in semiarid NE Brazil"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","947"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Soil Biology and Biochemistry"],["dc.bibliographiccitation.lastpage","954"],["dc.bibliographiccitation.volume","35"],["dc.contributor.author","Potthoff, M."],["dc.contributor.author","Loftfield, N."],["dc.contributor.author","Buegger, F."],["dc.contributor.author","Wick, B."],["dc.contributor.author","John, Bettina"],["dc.contributor.author","Joergensen, Rainer Georg"],["dc.contributor.author","Flessa, H."],["dc.date.accessioned","2018-11-07T10:38:09Z"],["dc.date.available","2018-11-07T10:38:09Z"],["dc.date.issued","2003"],["dc.description.abstract","The determination of the isotopic composition of the microbial biomass C in soil is an important tool to study soil microbial ecology and the decomposition and microbial immobilization of soil organic C. We discuss advantages and disadvantages of different methods to determine C-13/C-12 in soil microbial biomass and propose a new procedure that is based on the UV-catalyzed liquid oxidation of fumigated and non-fumigated soil extracts combined with trapping of the released CO2 in liquid nitrogen and subsequent determination of delta(13)CO(2)-C by a gas chromatograph connected with an isotope ratio mass spectrometer (IRMS). This method was evaluated using test solutions with known isotopic composition and soil extracts. Additionally, the method was compared with an off-line sample preparation technique combined with isotope analysis by a dual-inlet IRMS and an on-line analysis using an elemental analyser connected with an IRMS. All methods applied obtained comparable results and there were no significant differences between the delta(13)C values measured. The off-line preparation procedure had the highest precision but it was also the most labour-intensive. The choice of the most suitable method depends mainly on the number of samples that have to be analysed, the salt concentration of the extracts and the differences of delta(13)C that have to be detected. The application of this method with liquid oxidation and subsequent GC-IRMS analysis showed that microbial biomass C of a grassland soil was C-13-enriched by 2parts per thousand delta(13)C(PDB) compared with the total soil organic C. The addition of maize straw resulted in a rapid immobilization of maize C in the microbial biomass. (C) 2003 Elsevier Science Ltd. All fights reserved."],["dc.identifier.doi","10.1016/S0038-0717(03)00151-2"],["dc.identifier.isi","000184125500008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/45743"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0038-0717"],["dc.title","The determination of delta C-13 in soil microbial biomass using fumigation-extraction"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","59"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Plant and Soil"],["dc.bibliographiccitation.lastpage","70"],["dc.bibliographiccitation.volume","222"],["dc.contributor.author","Wick, B."],["dc.contributor.author","Tiessen, Holm"],["dc.contributor.author","Menezes, RSC"],["dc.date.accessioned","2018-11-07T11:14:32Z"],["dc.date.available","2018-11-07T11:14:32Z"],["dc.date.issued","2000"],["dc.description.abstract","The presence of trees in grasslands frequently results in resource islands of higher soil quality. Therefore, some native trees are often preserved or agroforestry species are interplanted when land is cleared for pasture. We evaluated soil quality changes associated with the conversion of a native thorn forest (caatinga) into silvo-pastoral systems in semiarid NE Brazil. Soil nutrients, organic matter, microbial biomass and soil enzymes under native caatinga, the canopy of two preserved native (Ziziphus joazeiro and Spondias tuberosa) and one introduced tree species (Prosopis juliflora), and under a planted pasture of Cenchrus ciliaris were compared. The two preserved tree species maintained high nutrient and organic matter contents and high biological activity levels not only relative to the grass but also relative to the native caatinga. The non-deciduous Z. joazeiro was more effective than the deciduous S. tuberosa, and enriched surface soils by 100 mg P kg(-1). The complete replacement of natural caatinga with C. ciliaris pasture or a C. ciliaris-P. juliflora silvopastoral system had, after 14 years, decreased microbial biomass C and N contents, and ss-glucosidase activity, but did not affect soil nutrient or organic matter status. The biological activity under the trees of the tree-grass association was greater than under grass alone, although P. juliflora did not maintain higher nutrient or organic matter levels. The search for indigenous alternatives to the main agroforestry species may provide viable alternatives for improved land management and the conservation of biodiversity. Microbiological and biochemical parameters responded more readily to changes in land management than chemical fertility indices. They are important indices for the impact of vegetation changes and its associated land quality changes."],["dc.identifier.doi","10.1023/A:1004756416281"],["dc.identifier.isi","000088041000006"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/54143"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Kluwer Academic Publ"],["dc.relation.issn","0032-079X"],["dc.title","Land quality changes following the conversion of the natural vegetation into silvo-pastoral systems in semi-arid NE Brazil"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","20150275"],["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","1694"],["dc.bibliographiccitation.journal","Philosophical Transactions of the Royal Society B: Biological Sciences"],["dc.bibliographiccitation.lastpage","8"],["dc.bibliographiccitation.volume","371"],["dc.contributor.author","Drescher, Jochen"],["dc.contributor.author","Rembold, Katja"],["dc.contributor.author","Allen, Kara"],["dc.contributor.author","Beckschäfer, Philip"],["dc.contributor.author","Buchori, Damayanti"],["dc.contributor.author","Clough, Yann"],["dc.contributor.author","Faust, Heiko"],["dc.contributor.author","Fauzi, Anas M."],["dc.contributor.author","Gunawan, Dodo"],["dc.contributor.author","Hertel, Dietrich"],["dc.contributor.author","Irawan, Bambang"],["dc.contributor.author","Jaya, I. Nengah Surati"],["dc.contributor.author","Klarner, Bernhard"],["dc.contributor.author","Kleinn, Christoph"],["dc.contributor.author","Knohl, Alexander"],["dc.contributor.author","Kotowska, Martyna M."],["dc.contributor.author","Krashevska, Valentyna"],["dc.contributor.author","Krishna, Vijesh V."],["dc.contributor.author","Leuschner, Christoph"],["dc.contributor.author","Lorenz, Wolfram"],["dc.contributor.author","Meijide, Ana"],["dc.contributor.author","Melati, Dian Nuraini"],["dc.contributor.author","Nomura, Miki"],["dc.contributor.author","Pérez-Cruzado, César"],["dc.contributor.author","Qaim, Matin"],["dc.contributor.author","Siregar, Iskandar Z."],["dc.contributor.author","Steinebach, Stefanie"],["dc.contributor.author","Tjoa, Aiyen"],["dc.contributor.author","Tscharntke, Teja"],["dc.contributor.author","Wick, Barbara"],["dc.contributor.author","Wiegand, Kerstin"],["dc.contributor.author","Kreft, Holger"],["dc.contributor.author","Scheu, Stefan"],["dc.date.accessioned","2017-08-25T10:13:33Z"],["dc.date.available","2017-08-25T10:13:33Z"],["dc.date.issued","2016"],["dc.description.abstract","Tropical lowland rainforests are increasingly threatened by the expansion of agriculture and the extraction of natural resources. In Jambi Province, Indonesia, the interdisciplinary EFForTS project focuses on the ecological and socio-economic dimensions of rainforest conversion to jungle rubber agroforests and monoculture plantations of rubber and oil palm. Our data confirm that rainforest transformation and land use intensification lead to substantial losses in biodiversity and related ecosystem functions, such as decreased above- and below-ground carbon stocks. Owing to rapid step-wise transformation from forests to agroforests to monoculture plantations and renewal of each plantation type every few decades, the converted land use systems are continuously dynamic, thus hampering the adaptation of animal and plant communities. On the other hand, agricultural rainforest transformation systems provide increased income and access to education, especially for migrant smallholders. Jungle rubber and rubber monocultures are associated with higher financial land productivity but lower financial labour productivity compared to oil palm, which influences crop choice: smallholders that are labour-scarce would prefer oil palm while land-scarce smallholders would prefer rubber. Collecting long-term data in an interdisciplinary context enables us to provide decision-makers and stakeholders with scientific insights to facilitate the reconciliation between economic interests and ecological sustainability in tropical agricultural landscapes."],["dc.identifier.doi","10.1098/rstb.2015.0275"],["dc.identifier.fs","619787"],["dc.identifier.gro","3150104"],["dc.identifier.pmid","27114577"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14226"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6835"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.relation","SFB 990: Ökologische und sozioökonomische Funktionen tropischer Tieflandregenwald-Transformationssysteme (Sumatra, Indonesien)"],["dc.relation","SFB 990 | A | A03: Untersuchung von Land-Atmosphäre Austauschprozesse in Landnutzungsänderungs-Systemen"],["dc.relation","SFB 990 | B | B04: Pflanzenproduktivität und Ressourcenaufteilung im Wurzelraum entlang von Gradienten tropischer Landnutzungsintensität und Baumartenvielfalt"],["dc.relation","SFB 990 | B | B05: Land use patterns in Jambi - quantification of structure, heterogeneity and changes of vegetation and land use as a basis for the explanation of ecological and socioeconomic functions"],["dc.relation","SFB 990 | B | B08: Struktur und Funktion des Zersetzersystems in Transformationssystemen von Tiefland-Regenwäldern"],["dc.relation","SFB 990 | B | B09: Oberirdische Biodiversitätsmuster und Prozesse in Regenwaldtransformations-Landschaften"],["dc.relation","SFB 990 | B | B10: Landschaftsbezogene Bewertung der ökologischen und sozioökonomischen Funktionen von Regenwald- Transformationssystemen in Sumatra (Indonesien)"],["dc.relation","SFB 990 | C | C07: Einflussfaktoren von Landnutzungswandel und sozioökonomische Auswirkungen für ländliche Haushalte"],["dc.relation","SFB 990 | Z | Z02: Central Scientific Support Unit"],["dc.relation.issn","0962-8436"],["dc.relation.orgunit","Abteilung Ökosystemmodellierung"],["dc.relation.orgunit","Department für Agrarökonomie und Rurale Entwicklung"],["dc.relation.orgunit","Abteilung Bioklimatologie"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.subject.gro","sfb990_journalarticles"],["dc.title","Ecological and socio-economic functions across tropical land use systems after rainforest conversion"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","155"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Biology and Fertility of Soils"],["dc.bibliographiccitation.lastpage","167"],["dc.bibliographiccitation.volume","35"],["dc.contributor.author","Wick, B."],["dc.contributor.author","Kuhne, R. F."],["dc.contributor.author","Vielhauer, K."],["dc.contributor.author","Vlek, Paul L. G."],["dc.date.accessioned","2018-11-07T10:30:03Z"],["dc.date.available","2018-11-07T10:30:03Z"],["dc.date.issued","2002"],["dc.description.abstract","We evaluated the temporal variation of microbial biomass C, beta-glucosidase, acid phosphomonoesterase (acP), alkaline phosphomonoesterase (alP), and protease activity over 18 consecutive months. The likely causes for the seasonal variability at a non-degraded and a degraded site in south-western Nigeria were identified. Microbial biomass, alP, and beta-glucosidase activity were sensitive indicators of soil quality changes over time. Microbial biomass C correlated significantly with soil moisture conditions and soil organic matter-related parameters. AlP and beta-glucosidase activities were not controlled by climatic conditions over the course of two rainy seasons and one dry season but were temporally related to microbial biomass C and total C and N. Due to the steadiness of the alP activity over time the enzyme is considered a suitable indicator with which to monitor long-term changes of soil quality. Single sampling during the course of a year is adequate. Both microbial biomass and beta-glucosidase activity fluctuated highly. They were sensitive indicators to monitor short-term variations of soil quality with. Sampling for microbial biomass ought to be limited to the rainy seasons, whereas the measurement of beta-glucosidase activity need not be restricted seasonally. Due to the short-term variability found, sampling should be repeated. AcP and protease activity fluctuated highly during the course of a year and exhibited pronounced inter-seasonal differences. The marked seasonal changes could not be ascribed to soil moisture conditions and only poorly to major ecological C soil processes. This was more pronounced for acP than for protease. Hence, neither parameter was considered a sensitive and meaningful indicator of soil quality changes over time."],["dc.identifier.doi","10.1007/s00374-002-0455-7"],["dc.identifier.isi","000176060500002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/43776"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0178-2762"],["dc.title","Temporal variability of selected soil microbiological and biochemical indicators under different soil quality conditions in south-western Nigeria"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]