Leitner, Daniela

[["dc.bibliographiccitation.firstpage","1173"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Agroforestry Systems"],["dc.bibliographiccitation.lastpage","1187"],["dc.bibliographiccitation.volume","87"],["dc.contributor.author","Leuschner, Christoph"],["dc.contributor.author","Moser, Gerald"],["dc.contributor.author","Hertel, Dietrich"],["dc.contributor.author","Erasmi, Stefan"],["dc.contributor.author","Leitner, Daniela"],["dc.contributor.author","Culmsee, Heike"],["dc.contributor.author","Schuldt, Bernhard"],["dc.contributor.author","Schwendenmann, Luitgard"],["dc.date.accessioned","2018-08-10T14:37:12Z"],["dc.date.accessioned","2020-05-11T13:21:03Z"],["dc.date.available","2018-08-10T14:37:12Z"],["dc.date.available","2020-05-11T13:21:03Z"],["dc.date.issued","2013"],["dc.description.abstract","Tropical forests store a large part of the terrestrial carbon and play a key role in the global carbon (C) cycle. In parts of Southeast Asia, conversion of natural forest to cacao agroforestry systems is an important driver of deforestation, resulting in C losses from biomass and soil to the atmosphere. This case study from Sulawesi, Indonesia, compares natural forest with nearby shaded cacao agroforests for all major above and belowground biomass C pools (n = 6 plots) and net primary production (n = 3 plots). Total biomass (above- and belowground to 250 cm soil depth) in the forest (approx. 150 Mg C ha−1) was more than eight times higher than in the agroforest (19 Mg C ha−1). Total net primary production (NPP, above- and belowground) was larger in the forest than in the agroforest (approx. 29 vs. 20 Mg dry matter (DM) ha−1 year−1), while wood increment was twice as high in the forest (approx. 6 vs. 3 Mg DM ha−1 year−1). The SOC pools to 250 cm depth amounted to 134 and 78 Mg C ha−1 in the forest and agroforest stands, respectively. Replacement of tropical moist forest by cacao agroforest reduces the biomass C pool by approximately 130 Mg C ha−1; another 50 Mg C ha−1 may be released from the soil. Further, the replacement of forest by cacao agroforest also results in a 70–80 % decrease of the annual C sequestration potential due to a significantly smaller stem increment."],["dc.identifier.doi","10.1007/s10457-013-9628-7"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/65035"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.eissn","1572-9680"],["dc.relation.issn","0167-4366"],["dc.title","Conversion of tropical moist forest into cacao agroforest: consequences for carbon pools and annual C sequestration"],["dc.title.subtitle","consequences for carbon pools and annual C sequestration"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["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","755"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Biotropica"],["dc.bibliographiccitation.lastpage","762"],["dc.bibliographiccitation.volume","43"],["dc.contributor.author","Cicuzza, Daniele"],["dc.contributor.author","Kessler, Michael"],["dc.contributor.author","Clough, Yann"],["dc.contributor.author","Pitopang, Ramadhanil"],["dc.contributor.author","Leitner, Daniela"],["dc.contributor.author","Tjitrosoedirdjo, S."],["dc.date.accessioned","2018-11-07T08:50:19Z"],["dc.date.available","2018-11-07T08:50:19Z"],["dc.date.issued","2011"],["dc.description.abstract","Tropical secondary forest and agroforestry systems have been identified as important refuges for the local species diversity of birds and other animal groups, but little is known about the importance of these systems for terrestrial herbs. In particular, few studies report how the conversion from tropical forest to technified cacao plantation affects the species richness and the community structure of herbs. We conducted surveys in 43 cacao plantations along the border of the Lore Lindu National Park in Central Sulawesi, ranging from agroforests to technified cacao, categorizing the plantations as rustic cacao, planted shade cacao, and technified cacao. We recorded 91 herb species. Of the 74 species determined to species level, 21 were also found in natural forests, while 53 were recorded only in agricultural habitats. Araceae was the most forest-dependent plant family while Asteraceae included the highest number of nonforest species. Overall, the presence of forest species was confined to moderately intensively managed rustic and planted shaded plantations. Distance from the forest, which has been identified as a crucial parameter for the diversity and composition of other taxa in cacao agroforests, only played a minimal role for herbs. Our study suggests that native forest herbs maybe more vulnerable to forest conversion than animal groups. The intensification of cacao plantation management increases the presence of weedy species to the detriment of native forest species."],["dc.description.sponsorship","German Research Foundation (DFG) [SFB-552]; Synthesys NL-TAF [3536]"],["dc.identifier.doi","10.1111/j.1744-7429.2010.00741.x"],["dc.identifier.isi","000296909800014"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21670"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","0006-3606"],["dc.title","Conservation Value of Cacao Agroforestry Systems for Terrestrial Herbaceous Species in Central Sulawesi, Indonesia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1515"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Global Change Biology"],["dc.bibliographiccitation.lastpage","1530"],["dc.bibliographiccitation.volume","16"],["dc.contributor.author","Schwendenmann, Luitgard"],["dc.contributor.author","Veldkamp, Edzo"],["dc.contributor.author","Moser, Gerald"],["dc.contributor.author","Hölscher, Dirk"],["dc.contributor.author","Köhler, Michael"],["dc.contributor.author","Clough, Yann"],["dc.contributor.author","Anas, Iswandi"],["dc.contributor.author","Djajakirana, Gunawan"],["dc.contributor.author","Erasmi, Stefan"],["dc.contributor.author","Hertel, Dietrich"],["dc.contributor.author","Leitner, Daniela"],["dc.contributor.author","Leuschner, Christoph"],["dc.contributor.author","Michalzik, Beate"],["dc.contributor.author","Propastin, Pavel"],["dc.contributor.author","Tjoa, Aiyen"],["dc.contributor.author","van Straaten, Oliver"],["dc.date.accessioned","2017-08-25T10:13:31Z"],["dc.date.accessioned","2020-05-11T13:19:25Z"],["dc.date.available","2017-08-25T10:13:31Z"],["dc.date.available","2020-05-11T13:19:25Z"],["dc.date.issued","2010"],["dc.description.abstract","Agroforestry systems may play a critical role in reducing the vulnerability of farmers' livelihood to droughts as tree-based systems provide several mechanisms that can mitigate the impacts from extreme weather events. Here, we use a replicated throughfall reduction experiment to study the drought response of a cacao/Gliricidia stand over a 13-month period. Soil water content was successfully reduced down to a soil depth of at least 2.5 m. Contrary to our expectations we measured only relatively small nonsignificant changes in cacao (−11%) and Gliricidia (−12%) sap flux densities, cacao leaf litterfall (+8%), Gliricidia leaf litterfall (−2%), soil carbon dioxide efflux (−14%), and cacao yield (−10%) during roof closure. However, cacao bean yield in roof plots was substantially lower (−45%) compared with control plots during the main harvest following the period when soil water content was lowest. This indicates that cacao bean yield was more sensitive to drought than other ecosystem functions. We found evidence in this agroforest that there is complementary use of soil water resources through vertical partitioning of water uptake between cacao and Gliricidia. This, in combination with acclimation may have helped cacao trees to cope with the induced drought. Cacao agroforests may thus play an important role as a drought-tolerant land use in those (sub-) tropical regions where the frequency and severity of droughts is projected to increase."],["dc.identifier.doi","10.1111/j.1365-2486.2009.02034.x"],["dc.identifier.gro","3150086"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6815"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","1354-1013"],["dc.subject","cacao yield; CO2 efflux; fine root biomass; leaf litterfall; plant water uptake; sap flux; shade trees; soil water; throughfall reduction"],["dc.title","Effects of an experimental drought on the functioning of a cacao agroforestry system, Sulawesi, Indonesia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]