Gerold, Gerhard

[["dc.bibliographiccitation.firstpage","109"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Erdkunde"],["dc.bibliographiccitation.lastpage","122"],["dc.bibliographiccitation.volume","67"],["dc.contributor.author","Köhler, Stefan"],["dc.contributor.author","Jungkunst, Hermann F."],["dc.contributor.author","Erasmi, Stefan"],["dc.contributor.author","Gerold, Gerhard"],["dc.date.accessioned","2018-11-07T09:26:10Z"],["dc.date.accessioned","2020-05-11T13:17:09Z"],["dc.date.available","2018-11-07T09:26:10Z"],["dc.date.available","2020-05-11T13:17:09Z"],["dc.date.issued","2013"],["dc.description.abstract","Deposition rates in remote areas due to anthropogenic emissions are increasing in Asian countries and elsewhere. The burning of biomass in slash-and-burn activities, in addition to burning fossil fuel result in higher rates of atmospheric deposition at forest and agricultural sites. An investigation of bulk depositions in Central Sulawesi was conducted at 13 field sites along a land use cover gradient that included natural and unused sites, slash-and-burn sites, and consolidated agricultural systems around and in the Lore Lindu National Park, an area of more than 2310 km(2). Bulk depositions rates were measured with passive ion exchange collectors. Our results show that Central Sulawesi generally experiences low deposition rates. Depositions that originate mainly from anthropogenic sources, such as nitrate, are very low, i.e. between 0.1 and 0.8 kg ha(-1) a(-1), but increase to 2.4 nitrate kg ha(-1) a(-1) near slash-and-burn areas. Similar patterns were found for elements such as potassium and calcium. Indeterminate depositions were found for geogenic elements such as iron, manganese and aluminium and in some cases phosphorus. A principal component analysis allowed differentiation between the contributions of different sources and different element to the total deposition impact in most cases. Specific deposition rates were recorded for different land use systems. The main factor that generated different deposition patterns was biomass burning resulting from slash-and-burn activities. The latter determined the composition of atmospheric depositions of nearby sites, but the more distant sites inside the national park do not appear to be influenced by these anthropogenic activities yet."],["dc.description.sponsorship","German Research Foundation (DFG) [SFB 552]"],["dc.identifier.doi","10.3112/erdkunde.2013.02.01"],["dc.identifier.isi","000324807900001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65017"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0014-0015"],["dc.title","The effects of land use change on atmospheric nutrientdeposition in Central Sulawesi"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","438"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Journal of Wood Chemistry and Technology"],["dc.bibliographiccitation.lastpage","449"],["dc.bibliographiccitation.volume","35"],["dc.contributor.author","Koehler, S."],["dc.contributor.author","Levia, D. F."],["dc.contributor.author","Jungkunst, Hermann F."],["dc.contributor.author","Gerold, Gerhard"],["dc.date.accessioned","2018-11-07T10:02:54Z"],["dc.date.available","2018-11-07T10:02:54Z"],["dc.date.issued","2015"],["dc.description.abstract","Bark pH is an essential parameter which partly governs the chemistry of the bark as well as its suitability as a microhabitat to a wide range of epiphytic organisms. Bark pH is known to vary with tree species, epiphytic cover, stemflow channelization, and anthropogenic influences. To date, reliable methods to quantify the spatial and temporal dimensions of bark pH have remained elusive. The aim of the present study was to develop and validate an in situ method to measure the surface pH of bark with high spatial resolution. Agar-agar panels, prepared with a pH indicator, were used to quantify and map the spatial variation of bark pH for cacao trees in Indonesia. Fine-scale changes of bark pH were clearly detectable and quantifiable with our bark pH mapping method. Bark pH was found to vary as a function of bark microrelief and the presence of epiphytes. The use of pH reference panels validated the bark pH measurements obtained from our method. The bark pH measurement method developed, described, and validated in this article is inexpensive and straightforward. It has the potential for wide adoption by scientists across disciplines who are interested in bark pH and its effect on life in the cortisphere. Unlike conventional methods to measure bark pH in deionized water or KCl extracts, our method is able to identify fine-scale spatial changes in bark pH that are relevant for the colonization of bark by organisms."],["dc.description.sponsorship","German Research Foundation (DFG) [SFB 552.]"],["dc.identifier.doi","10.1080/02773813.2015.1025285"],["dc.identifier.isi","000362649600005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38329"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Taylor & Francis Inc"],["dc.relation.issn","1532-2319"],["dc.relation.issn","0277-3813"],["dc.title","AN IN SITU METHOD TO MEASURE AND MAP BARK PH"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","259"],["dc.bibliographiccitation.journal","Science of The Total Environment"],["dc.bibliographiccitation.lastpage","274"],["dc.bibliographiccitation.volume","635"],["dc.contributor.author","Nóbrega, Rodolfo L.B."],["dc.contributor.author","Guzha, Alphonce C."],["dc.contributor.author","Lamparter, Gabriele"],["dc.contributor.author","Amorim, Ricardo S.S."],["dc.contributor.author","Couto, Eduardo G."],["dc.contributor.author","Hughes, Harold J."],["dc.contributor.author","Jungkunst, Hermann F."],["dc.contributor.author","Gerold, Gerhard"],["dc.date.accessioned","2020-12-10T15:21:12Z"],["dc.date.available","2020-12-10T15:21:12Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1016/j.scitotenv.2018.03.356"],["dc.identifier.issn","0048-9697"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/72947"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Impacts of land-use and land-cover change on stream hydrochemistry in the Cerrado and Amazon biomes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","113"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","South African Geographical Journal"],["dc.bibliographiccitation.lastpage","118"],["dc.bibliographiccitation.volume","96"],["dc.contributor.author","Krueger, Jan Paul"],["dc.contributor.author","Beckedahl, Heinz"],["dc.contributor.author","Gerold, Gerhard"],["dc.contributor.author","Jungkunst, Hermann F."],["dc.date.accessioned","2018-11-07T09:37:49Z"],["dc.date.available","2018-11-07T09:37:49Z"],["dc.date.issued","2014"],["dc.description.abstract","The global importance of wetlands in the carbon and nitrogen cycles is well documented, but the specific greenhouse gas characteristics of South African wetlands are less well known. These wetlands most likely differ from more prominent wetlands from continuously humid climate zone (boreal, temperate and tropics). Particular wetlands in the southern Drakensberg are adapted to the seasonal drying during the winter months. Greenhouse gas emissions were measured during natural rewetting at two wetlands. A rapid reaction and significant positive correlation between greenhouse gas fluxes and ground water level were determined. Methane emissions were observed after two days of rewetting at one of the wetlands, and nitrous oxide emissions started within a day of rewetting at the other wetland. The high nitrous oxide emissions may be caused by the recent winter burning of vegetation, which most likely resulted in a greater availability of nitrogen in the soil. High nitrous oxide emissions following natural rewetting (the annual cyclical process in these wetlands) could contribute significantly to the local greenhouse gas budget. Hence, besides the methane emissions, the nitrous oxide emissions of wetlands in southern Africa should be taken into account."],["dc.identifier.doi","10.1080/03736245.2013.847798"],["dc.identifier.isi","000343310200001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/32925"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Routledge Journals, Taylor & Francis Ltd"],["dc.relation.issn","2151-2418"],["dc.relation.issn","0373-6245"],["dc.title","Greenhouse gas emission peaks following natural rewetting of two wetlands in the southern Ukhahlamba-Drakensberg Park, South Africa"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1133"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Journal of Soils and Sediments"],["dc.bibliographiccitation.lastpage","1140"],["dc.bibliographiccitation.volume","13"],["dc.contributor.author","Truong Xuan Vuong, Truong Xuan Vuong"],["dc.contributor.author","Heitkamp, Felix"],["dc.contributor.author","Jungkunst, Hermann F."],["dc.contributor.author","Reimer, Andreas"],["dc.contributor.author","Gerold, Gerhard"],["dc.date.accessioned","2018-11-07T09:21:58Z"],["dc.date.available","2018-11-07T09:21:58Z"],["dc.date.issued","2013"],["dc.description.abstract","The best method for determining soil organic carbon (SOC) in carbonate-containing samples is still open to debate. The objective of this work was to evaluate a thermal gradient method (ThG), which can determine simultaneously inorganic carbon (SIC) and SOC in a wide range of soil samples. The determination of SOC by ThG (SOCThG) was compared to the following widespread standard methods: (1) acidification (ACI) as pretreatment and subsequent dry combustion (SOCACI) and (2) volumetric quantification of SIC by a calcimeter (CALC) and subtraction of the total carbon content as determined by dry combustion (SOCCALC). Precision (F test) and bias (t test) were tested on a subset of seven samples (n = 3). Comparison of the ThG and CALC methods was performed by regression analysis (n = 76) on samples representing a wide range of SOC (5.5 to 212.0 g kg(-1)) and SIC (0 to 59.2 g kg(-1)) contents. Tests on the replicated subset showed that the precision of ThG was not significantly different from ACI or CALC (F values < 39, n = 3) for SOC and SIC measurements. However, SOCACI and SOCCALC contents were systematically and significantly lower compared to SOCThG contents. The positive bias for SOCThG relative to SOCCALC contents appeared also in the regression analysis (given numbers +/- standard errors) of the whole data set (y = (4.67 +/- 0.70) + (0.99 +/- 0.01)x, R (2) = 0.99, n = 76). When performing a regression with carbonate-free samples, the bias between the methods was negative (-2.90 +/- 0.63, n = 29) but was positive in the set with carbonate-containing samples (3.95 +/- 1.41, n = 47). This observation corroborated the suspicion that the use of acid for carbonate decomposition can lead to an underestimation of SOC. All methods were suitable for differentiation between SIC and SOC, but the use of acid resulted in lower estimates of SOC contents. When comparing soil samples with different carbonate concentrations, the use of the ThG method is more reliable."],["dc.identifier.doi","10.1007/s11368-013-0715-1"],["dc.identifier.isi","000322372200002"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/29229"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1439-0108"],["dc.title","Simultaneous measurement of soil organic and inorganic carbon: evaluation of a thermal gradient analysis"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","161"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Regional Environmental Change"],["dc.bibliographiccitation.lastpage","173"],["dc.bibliographiccitation.volume","18"],["dc.contributor.author","Schaldach, Rüdiger"],["dc.contributor.author","Meurer, Katharina H. E."],["dc.contributor.author","Jungkunst, Hermann F."],["dc.contributor.author","Nendel, Claas"],["dc.contributor.author","Lakes, Tobia"],["dc.contributor.author","Gollnow, Florian"],["dc.contributor.author","Göpel, Jan"],["dc.contributor.author","Boy, Jens"],["dc.contributor.author","Guggenberger, Georg"],["dc.contributor.author","Strey, Robert"],["dc.contributor.author","Strey, Simone"],["dc.contributor.author","Berger, Thomas"],["dc.contributor.author","Gerold, Gerhard"],["dc.contributor.author","Schönenberg, Regine"],["dc.contributor.author","Böhner, Jürgen"],["dc.contributor.author","Schindewolf, Marcus"],["dc.contributor.author","Latynskiy, Evgeny"],["dc.contributor.author","Hampf, Anna"],["dc.contributor.author","Parker, Phillip S."],["dc.contributor.author","Sentelhas, Paulo César"],["dc.date.accessioned","2020-12-10T14:11:11Z"],["dc.date.available","2020-12-10T14:11:11Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1007/s10113-017-1244-z"],["dc.identifier.eissn","1436-378X"],["dc.identifier.issn","1436-3798"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/70993"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","A model-based assessment of the environmental impact of land-use change across scales in Southern Amazonia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]