Tamrakar, Rijan

[["dc.bibliographiccitation.firstpage","101"],["dc.bibliographiccitation.journal","Forest Ecology and Management"],["dc.bibliographiccitation.lastpage","108"],["dc.bibliographiccitation.volume","355"],["dc.contributor.author","Herbst, Mathias"],["dc.contributor.author","Mund, Martina"],["dc.contributor.author","Tamrakar, Rijan"],["dc.contributor.author","Knohl, Alexander"],["dc.date.accessioned","2017-09-07T11:50:01Z"],["dc.date.available","2017-09-07T11:50:01Z"],["dc.date.issued","2015"],["dc.identifier.doi","10.1016/j.foreco.2015.05.034"],["dc.identifier.gro","3147531"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5043"],["dc.notes.status","public"],["dc.notes.submitter","chake"],["dc.relation.issn","0378-1127"],["dc.relation.orgunit","Abteilung Bioklimatologie"],["dc.title","Differences in carbon uptake and water use between a managed and an unmanaged beech forest in central Germany"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","111"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","New Phytologist"],["dc.bibliographiccitation.lastpage","125"],["dc.bibliographiccitation.volume","226"],["dc.contributor.author","Mund, Martina"],["dc.contributor.author","Herbst, Mathias"],["dc.contributor.author","Knohl, Alexander"],["dc.contributor.author","Matthäus, Bertrand"],["dc.contributor.author","Schumacher, Jens"],["dc.contributor.author","Schall, Peter"],["dc.contributor.author","Siebicke, Lukas"],["dc.contributor.author","Tamrakar, Rijan"],["dc.contributor.author","Ammer, Christian"],["dc.date.accessioned","2021-04-14T08:27:28Z"],["dc.date.available","2021-04-14T08:27:28Z"],["dc.date.issued","2020"],["dc.description.abstract","Summary Controls on tree growth are key issues in plant physiology. The hypothesis of our study was that the interannual variability of wood and fruit production are primarily controlled directly by weather conditions (sink limitation), while carbon assimilation (source limitation) plays a secondary role. We analyzed the interannual variability of weather conditions, gross primary productivity (GPP) and net primary productivity (NPP) of wood and fruits of an old‐growth, unmanaged Fagus sylvatica forest over 14 yr, including six mast years. In a multiple linear regression model, c. 71% of the annual variation in wood‐NPP could be explained by mean air temperature in May, precipitation from April to May (positive influence) and fruit‐NPP (negative influence). GPP of June to July solely explained c. 42% of the variation in wood‐NPP. Fruit‐NPP was positively related to summer precipitation 2 yr before (R2 = 0.85), and negatively to precipitation in May (R2 = 0.83) in the fruit years. GPP had no influence on fruit‐NPP. Our results suggest a complex system of sink and source limitations to tree growth driven by weather conditions and going beyond a simple carbon‐mediated ‘trade‐off’ between regenerative and vegetative growth."],["dc.description.sponsorship","Integrated project CarboEurope‐IP, European Commission, Directorate‐General Research, Sixth Framework Programme, Priority 1.1.6.3: Global Change and Ecosystem http://dx.doi.org/10.13039/501100004965"],["dc.description.sponsorship","Max Planck Institute for Biogeochemistry, Germany"],["dc.description.sponsorship","Georg‐August‐University Göttingen, Germany http://dx.doi.org/10.13039/501100003385"],["dc.description.sponsorship","German Research Foundation (DFG) http://dx.doi.org/10.13039/501100001659"],["dc.description.sponsorship","German Federal Ministry of Education and Research (BMBF; research infrastructure ICOS)"],["dc.identifier.doi","10.1111/nph.16408"],["dc.identifier.eissn","1469-8137"],["dc.identifier.issn","0028-646X"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/82299"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1469-8137"],["dc.relation.issn","0028-646X"],["dc.relation.orgunit","Zentrum für Biodiversität und Nachhaltige Landnutzung"],["dc.relation.orgunit","Abteilung Bioklimatologie"],["dc.rights","This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited."],["dc.title","It is not just a ‘trade‐off’: indications for sink‐ and source‐limitation to vegetative and regenerative growth in an old‐growth beech forest"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","465"],["dc.bibliographiccitation.journal","Agricultural and Forest Meteorology"],["dc.bibliographiccitation.lastpage","476"],["dc.bibliographiccitation.volume","263"],["dc.contributor.author","Tamrakar, Rijan"],["dc.contributor.author","Rayment, Mark B."],["dc.contributor.author","Moyano, Fernando Esteban"],["dc.contributor.author","Mund, Martina"],["dc.contributor.author","Knohl, Alexander"],["dc.date.accessioned","2019-11-14T15:47:18Z"],["dc.date.available","2019-11-14T15:47:18Z"],["dc.date.issued","2018"],["dc.description.abstract","The effects of structural diversity on the carbon dioxide exchange (CO2) of forests has become an important area of research for improving the predictability of future CO2 budgets. We report the results of a paired eddy covariance tower study with 11 years of data on two forest sites of similar mean stand age, near-identical site conditions, and dominated by beech trees (Fagus sylvatica), but with a very different stand structure (incl. age, diameter distribution, stocks of dead wood and species composition) because of different management regimes. Here we address the question of how management and related structural diversity may affect CO2 fluxes, and tested the hypothesis that more structurally diverse stands are less sensitive to variations in abiotic and biotic drivers. Higher annual net ecosystem productivity (NEP) was observed in the managed, even-aged, and homogenous forest (585 ± 57.8 g C m⁻² yr⁻¹), than in the unmanaged, uneven-aged, and structurally diverse forest (487 ± 144 g C m⁻² yr⁻¹). About two-third of the difference in NEP between the sites was contributed by a higher annual gross primary productivity (GPP, 1627 ± 164 vs 1558 ± 118 g C m⁻² yr⁻¹) and one-third by a lower annual ecosystem respiration (Reco, 1042 ± 60 vs 1071 ± 96 g C m⁻² yr⁻¹) in the homogenous forest. Spring (April – May) and summer (June – July) were the two main seasons contributing to the overall annual differences between the sites, also, the sensitivities of seasonal NEP and GPP to environmental variables were stronger in the homogenous forest during those periods. Inter-annual variation of NEP was higher in the homogenous forest (coefficient of variation (CV) = 25%) compared to the heterogeneous forest (CV = 12%). At annual time scale, the higher variability of NEP in the homogenous forest is attributed to biotic factors such as fruit production and a time-dependent growth trend, outweighing differences in environmental sensitivities."],["dc.identifier.doi","10.1016/j.agrformet.2018.08.027"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/62629"],["dc.language.iso","en"],["dc.relation.issn","0168-1923"],["dc.relation.orgunit","Abteilung Bioklimatologie"],["dc.title","Implications of structural diversity for seasonal and annual carbon dioxide fluxes in two temperate deciduous forests"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","0048"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Nature Ecology & Evolution"],["dc.bibliographiccitation.volume","1"],["dc.contributor.author","Musavi, Talie"],["dc.contributor.author","Migliavacca, Mirco"],["dc.contributor.author","Reichstein, Markus"],["dc.contributor.author","Kattge, Jens"],["dc.contributor.author","Wirth, Christian"],["dc.contributor.author","Black, T. Andrew"],["dc.contributor.author","Janssens, Ivan A."],["dc.contributor.author","Knohl, Alexander"],["dc.contributor.author","Loustau, Denis"],["dc.contributor.author","Roupsard, Olivier"],["dc.contributor.author","Varlagin, Andrej"],["dc.contributor.author","Rambal, Serge"],["dc.contributor.author","Cescatti, Alessandro"],["dc.contributor.author","Gianelle, Damiano"],["dc.contributor.author","Kondo, Hiroaki"],["dc.contributor.author","Tamrakar, Rijan"],["dc.contributor.author","Mahecha, Miguel D."],["dc.date.accessioned","2017-09-07T11:50:03Z"],["dc.date.available","2017-09-07T11:50:03Z"],["dc.date.issued","2017"],["dc.description.abstract","The total uptake of carbon dioxide by ecosystems via photosynthesis (gross primary productivity, GPP) is the largest flux in the global carbon cycle. A key ecosystem functional property determining GPP is the photosynthetic capacity at light saturation (GPPsat), and its interannual variability (IAV) is propagated to the net land–atmosphere exchange of CO2. Given the importance of understanding the IAV in CO2 fluxes for improving the predictability of the global carbon cycle, we have tested a range of alternative hypotheses to identify potential drivers of the magnitude of IAV in GPPsat in forest ecosystems. Our results show that while the IAV in GPPsat within sites is closely related to air temperature and soil water availability fluctuations, the magnitude of IAV in GPPsat is related to stand age and biodiversity (R2 = 0.55, P < 0.0001). We find that the IAV of GPPsat is greatly reduced in older and more diverse forests, and is higher in younger forests with few dominant species. Older and more diverse forests seem to dampen the effect of climate variability on the carbon cycle irrespective of forest type. Preserving old forests and their diversity would therefore be beneficial in reducing the effect of climate variability on Earth's forest ecosystems."],["dc.identifier.doi","10.1038/s41559-016-0048"],["dc.identifier.gro","3147546"],["dc.identifier.pmid","28812604"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5051"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","2397-334X"],["dc.relation.orgunit","Abteilung Bioklimatologie"],["dc.title","Stand age and species richness dampen interannual variation of ecosystem-level photosynthetic capacity"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","501"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Nature Ecology & Evolution"],["dc.bibliographiccitation.lastpage","501"],["dc.bibliographiccitation.volume","3"],["dc.contributor.author","Musavi, Talie"],["dc.contributor.author","Migliavacca, Mirco"],["dc.contributor.author","Reichstein, Markus"],["dc.contributor.author","Kattge, Jens"],["dc.contributor.author","Wirth, Christian"],["dc.contributor.author","Black, T. Andrew"],["dc.contributor.author","Janssens, Ivan"],["dc.contributor.author","Knohl, Alexander"],["dc.contributor.author","Loustau, Denis"],["dc.contributor.author","Roupsard, Olivier"],["dc.contributor.author","Varlagin, Andrej B."],["dc.contributor.author","Rambal, Serge"],["dc.contributor.author","Cescatti, Alessandro"],["dc.contributor.author","Gianelle, Damiano"],["dc.contributor.author","Kondo, Hiroaki"],["dc.contributor.author","Tamrakar, Rijan"],["dc.contributor.author","Mahecha, Miguel D."],["dc.date.accessioned","2019-11-18T14:24:17Z"],["dc.date.available","2019-11-18T14:24:17Z"],["dc.date.issued","2019"],["dc.description.abstract","In the version of this Article originally published, the wrong Supplementary Information pdf was uploaded, in which the figures did not correspond with those mentioned in the main text and the R code was not presented properly. This has now been replaced."],["dc.identifier.doi","10.1038/s41559-019-0829-y"],["dc.identifier.pmid","30742108"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/62648"],["dc.language.iso","en"],["dc.relation.eissn","2397-334X"],["dc.relation.issn","2397-334X"],["dc.title","Publisher Correction: Stand age and species richness dampen interannual variation of ecosystem-level photosynthetic capacity"],["dc.type","journal_article"],["dc.type.internalPublication","no"],["dspace.entity.type","Publication"]]