Michalzik, Beate

[["dc.bibliographiccitation.firstpage","393"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Plant and Soil"],["dc.bibliographiccitation.lastpage","403"],["dc.bibliographiccitation.volume","342"],["dc.contributor.author","le Mellec, Anne"],["dc.contributor.author","Gerold, Gerhard"],["dc.contributor.author","Michalzik, Beate"],["dc.date.accessioned","2018-11-07T08:56:47Z"],["dc.date.available","2018-11-07T08:56:47Z"],["dc.date.issued","2011"],["dc.description.abstract","Apart from the forest floor, the canopy of forested ecosystems functions as the second most important source for dissolved and particulate fractions of organic and inorganic C and N compounds. However, under mass outbreak situations of insect herbivores this flux path of organic matter is considerably intensified clearly exceeding C and N fluxes from the forest floor. In this paper we report on herbivore-altered C and N fluxes from the canopy to the forest floor and effects on forest floor nutrient fluxes during severe defoliating herbivory of the winter moth (Operophtera brumata) and the mottled umber moth (Eranis defoliaria) in an oak forest in Germany. Over the course of 6.5 months we followed the C and N fluxes with bulk deposition, throughfall solution, insect frass deposits (green-fall together with insect faeces) and with forest floor solution in an 117-yr-old oak (Quercus petraea) forest. Compared to the control, herbivore defoliation significantly enhanced throughfall inputs of total and dissolved organic carbon and nitrogen by a factor of 3 and 2.5 (for TOC and DOC), and by 1.4 and 1.3 times (for TNb and DNb), respectively. Frass plus green-fall C and N fluxes peaked in May with 592 kg C ha(-1) and 33.5 kg N ha(-1) representing 79.6% (for C) and 78.3% (for N) of the total C and N input over 2.5 months. The quantitative and qualitative C and N input via faeces and litter deposition significantly differ between the insect affected and non-affected site. However, the C and N fluxes with throughfall did not significantly correlate with forest floor leachates. In this context, forest floor fluxes of TOC, DOC and NO3-N were significantly lower at the infested site compared to the control, whereas fluxes of NH4-N together with DON were significantly higher. The study demonstrates the importance of linking the population and associated frass dynamics of herbivorous insects with the cycling of nutrients and organic matter in forest ecosystems, highlighting the remarkable alterations in the timing, amounts and nature of organic matter dynamics on the ecosystem level. Consequently, the ecology of phytophagous insects allows partly to explain temporal-spatial alterations in nutrient cycling and thus ecosystem functioning."],["dc.description.sponsorship","German Research Foundation (DFG) [MI 927/1-3]"],["dc.identifier.doi","10.1007/s11104-010-0704-8"],["dc.identifier.isi","000289562000031"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6662"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/23233"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1573-5036"],["dc.relation.issn","0032-079X"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Insect herbivory, organic matter deposition and effects on belowground organic matter fluxes in a central European oak forest"],["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","255"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Plant and Soil"],["dc.bibliographiccitation.lastpage","262"],["dc.bibliographiccitation.volume","325"],["dc.contributor.author","Mellec, Anne"],["dc.contributor.author","Habermann, Michael"],["dc.contributor.author","Michalzik, Beate"],["dc.date.accessioned","2019-07-09T11:52:24Z"],["dc.date.available","2019-07-09T11:52:24Z"],["dc.date.issued","2009"],["dc.description.abstract","Herbivorous insects can affect ecological processes in forested ecosystems such as nutrient and matter cycling especially during outbreak situations. However, the knowledge about their contribution to the quality and flows of energy and matter in forests is still imperfect. In this paper we report on the herbivore-affected C to N ratios in different fractions of organic matter cascading from the canopy to the forest floor during a pine lappet (Dendrolimus pini L.) mass infestation. Throughout a four months period we monitored the C and N fluxes with throughfall, and the C/N ratios of insect excrements (faeces) and pine needles in an 80-year-old Scots pine forest. Compared to the control, herbivore defoliation significantly magnifies C and N input fluxes by two to three times amounting to 95 kg TOC and 5.9 kg TN ha−1 in addition. Concurrently NO3-N fluxes diminished and the C/N ratios in throughfall solutions increased during peaking frass activity. Compared to fresh needle biomass, the C/N ratios in insect faeces triple during peaking frass activity resulting in values between 70 and 100. This study demonstrates the importance of herbivorous insect’s pests on element cycling as they act as a short-time phenomenon altering the nutrient quality and quantity reaching the forest floor and potentially affecting below-ground processes."],["dc.identifier.doi","10.1007/s11104-009-9976-2"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?goescholar/3957"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/60177"],["dc.notes.intern","Merged from goescholar"],["dc.publisher","Springer"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.subject.ddc","570"],["dc.title","Canopy herbivory altering C to N ratios and soil input patterns of different organic matter fractions in a Scots pine forest"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]