Schwendenmann, Luitgard

[["dc.bibliographiccitation.firstpage","217"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Plant and Soil"],["dc.bibliographiccitation.lastpage","232"],["dc.bibliographiccitation.volume","288"],["dc.contributor.author","Schwendenmann, Luitgard"],["dc.contributor.author","Pendall, Elise"],["dc.date.accessioned","2018-11-07T09:13:24Z"],["dc.date.available","2018-11-07T09:13:24Z"],["dc.date.issued","2006"],["dc.description.abstract","Land-use and land-cover strongly influence soil properties such as the amount of soil organic carbon (SOC), aggregate structure and SOC turnover processes. We studied the effects of a vegetation shift from forest to grassland 90 years ago in soils derived from andesite material on Barro Colorado Island (BCI), Panama. We quantified the amount of carbon (C) and nitrogen (N) and determined the turnover of C in bulk soil, water stable aggregates (WSA) of different size classes (< 53 mu m, 53-250 mu m, 250-2000 mu m and 2000-8000 mu m) and density fractions (free light fraction, intra-aggregate particulate organic matter and mineral associated soil organic Q. Total SOC stocks (0-50 cm) under forest (84 Mg C ha(-1)) and grassland (64 Mg C ha(-1)) did not differ significantly. Our results revealed that vegetation type did not have an effect on aggregate structure and stability. The investigated soils at BCI did not show higher C and N concentrations in larger aggregates, indicating that organic material is not the major binding agent in these soils to form aggregates. Based on delta C-13 values and treating bulk soil as a single, homogenous C pool we estimated a mean residence time (MRT) of 69 years for the surface layer (0-5 cm). The MRT varied among the different SOC fractions and among depth. In 05 cm, MRT of intra-aggregate particulate organic matter (iPOM) was 29 years; whereas mineral associated soil organic C (mSOC) had a MRT of 124 years. These soils have substantial resilience to C and N losses because the > 90% of C and N is associated with mSOC, which has a comparatively long MRT."],["dc.identifier.doi","10.1007/s11104-006-9109-0"],["dc.identifier.isi","000243001400017"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/27168"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1573-5036"],["dc.relation.issn","0032-079X"],["dc.title","Effects of forest conversion into grassland on soil aggregate structure and carbon storage in Panama: evidence from soil carbon fractionation and stable isotopes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Biology and Fertility of Soils"],["dc.bibliographiccitation.volume","45"],["dc.contributor.author","Schwendenmann, Luitgard"],["dc.contributor.author","Pendall, Elise"],["dc.date.accessioned","2018-11-07T08:32:53Z"],["dc.date.available","2018-11-07T08:32:53Z"],["dc.date.issued","2009"],["dc.format.extent","335"],["dc.identifier.doi","10.1007/s00374-008-0343-x"],["dc.identifier.isi","000262825700013"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17442"],["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 (vol 44, pg 1053, 2008)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["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","2721"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","Global Change Biology"],["dc.bibliographiccitation.lastpage","2736"],["dc.bibliographiccitation.volume","16"],["dc.contributor.author","Pendall, Elise"],["dc.contributor.author","Schwendenmann, Luitgard"],["dc.contributor.author","Rahn, T."],["dc.contributor.author","Miller, J. B."],["dc.contributor.author","Tans, P. P."],["dc.contributor.author","White, J. W. C."],["dc.date.accessioned","2018-11-07T08:38:28Z"],["dc.date.available","2018-11-07T08:38:28Z"],["dc.date.issued","2010"],["dc.description.abstract","Conversion of tropical rainforests to pastures and plantations is associated with changes in soil properties and biogeochemical cycling, with implications for carbon cycling and trace gas fluxes. The stable isotopic composition of ecosystem respiration (delta 13C(R) and delta 18O(R)) is used in inversion models to quantify regional patterns of CO2 sources and sinks, but models are limited by sparse measurements in tropical regions. We measured soil respiration rates, concentrations of CO2, CH4, CO, N2O and H-2 and the isotopic composition of CO2, CH4 and H-2 at four heights in the nocturnal boundary layer (NBL) above three common land-use types in central Panama, during dry and rainy seasons. Soil respiration rates were lowest in Plantation (average 3.4 mu mol m-2 s-1), highest in Pasture (8.3 mu mol m-2 s-1) and intermediate in Rainforest (5.2 mu mol m-2 s-1). delta 13C(R) closely reflected land use and increased during the dry season where C-3 vegetation was present. delta 18O(R) did not differ by land use but was lower during the rainy than the dry season. CO2 was correlated with other species in approximately half of the NBL profiles, allowing us to estimate trace gas fluxes that were generally within the range of literature values. The Rainforest soil was a sink for CH4 but emissions were observed in Pasture and Plantation, especially during the wet season. N2O emissions were higher in Pasture and Plantation than Rainforest, contrary to expectations. Soil H-2 uptake was highest in Rainforest and was not observable in Pasture and Plantation during the wet season. We observed soil CO uptake during the dry season and emissions during the wet season across land-use types. This study demonstrated that strong impacts of land-use change on soil-atmosphere trace gas exchange can be detected in the NBL, and provides useful observational constraints for top-down and bottom-up biogeochemistry models."],["dc.identifier.doi","10.1111/j.1365-2486.2010.02199.x"],["dc.identifier.isi","000281676700008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/18779"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1354-1013"],["dc.title","Land use and season affect fluxes of CO2, CH4, CO, N2O, H-2 and isotopic source signatures in Panama: evidence from nocturnal boundary layer profiles"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Ecohydrology"],["dc.bibliographiccitation.lastpage","12"],["dc.bibliographiccitation.volume","8"],["dc.contributor.author","Schwendenmann, Luitgard"],["dc.contributor.author","Pendall, Elise"],["dc.contributor.author","Sanchez-Bragado, Rut"],["dc.contributor.author","Kunert, Norbert"],["dc.contributor.author","Hoelscher, Dirk"],["dc.date.accessioned","2017-09-07T11:45:40Z"],["dc.date.available","2017-09-07T11:45:40Z"],["dc.date.issued","2014"],["dc.description.abstract","We studied tree water uptake patterns, tested for complementary water use among species and analysed controlling factors in a tropical tree diversity experiment. The water uptake depth of five species was investigated across seasons and diversity levels using the natural abundance of water isotopes (δ2H, δ18O) and modelling. Three distinct water acquisition strategies were found for trees growing in monocultures during the dry season: strong reliance (>70%) on soil water from the upper layer (0–30 cm) (Cedrela odorata), uptake from the upper and deeper layers (>30 cm) in equal proportions (Hura crepitans, Anacardium excelsum and Luehea seemannii) and water uptake predominately from deeper layers (Tabebuia rosea). Seasonal shifts in water uptake were most pronounced for T. rosea. The water uptake pattern of a given species was independent of the diversity level underlining the importance of species identity and species characteristics in spatial and temporal tree water use. Statistics did not show a significant effect of diversity on source water fractions, but we did see some evidence for complementary water resource utilization in mixed species plots, especially in the dry season. Our results also demonstrated that the depth of soil water uptake was related to leaf phenology and tree transpiration rates. A higher proportion of water obtained from deeper soil layers was associated with a high percentage foliage cover in the dry season, which explained the higher transpiration rates."],["dc.identifier.doi","10.1002/eco.1479"],["dc.identifier.gro","3149069"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5714"],["dc.language.iso","en"],["dc.notes.intern","Hoelscher Crossref import"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","1936-0584"],["dc.title","Tree water uptake in a tropical plantation varying in tree diversity: interspecific differences, seasonal shifts and complementarity"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]