Michalzik, Beate

[["dc.bibliographiccitation.firstpage","1829"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE"],["dc.bibliographiccitation.lastpage","1841"],["dc.bibliographiccitation.volume","38"],["dc.contributor.author","le Mellec, Anne"],["dc.contributor.author","Michalzik, Beate"],["dc.date.accessioned","2018-11-07T11:13:17Z"],["dc.date.available","2018-11-07T11:13:17Z"],["dc.date.issued","2008"],["dc.description.abstract","Herbivorous insect infestations significantly alter element and nutrient cycling in forests, thus directly and indirectly affecting ecosystem functioning. In this paper, we report on the herbivore-mediated transfer of carbon (C) and nitrogen (N) from the canopy to the forest floor and its influence on soil microbial activity during a pine tappet (Dendrolimus pini L.) infestation. Over the course of 6 months, we followed C and N fluxes in bulk deposition, throughfall, and green fall (green needle debris dropped during herbivory) together with solid frass (insect faeces) in an 80-year-old Scots pine (Pinits silvestris L.) forest. Compared with the control, herbivore defoliation significantly doubled throughfall inputs of total and dissolved organic C and N over the study period. Frass plus green-fall C and N fluxes peaked in June-July at 110 kg C.ha(-1) and 2.3 kg N.ha(-1), respectively. Randomized intervention analysis revealed no significant effects of herbivory on soil microbial properties, except for adenylate energy charge, which showed slightly higher values under herbivory. This study demonstrates the importance of canopy herbivory on overall C and N inputs to forest ecosystems, particularly in altering the timing and quality of the organic material reaching the forest floor and potentially affecting belowground processes."],["dc.description.sponsorship","erman Research Foundation, DFG [MI 927/1-1]"],["dc.identifier.doi","10.1139/X08-045"],["dc.identifier.isi","000257359600012"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/53855"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Natl Research Council Canada-n R C Research Press"],["dc.relation.issn","0045-5067"],["dc.title","Impact of a pine lappet (Dendrolimus pini) mass outbreak on C and N fluxes to the forest floor and soil microbial properties in a Scots pine forest in Germany"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["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"]]