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\n  \n 2025\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n \n Outer appearance of bark-beetle-infested stands of Norway spruce after different standing storage durations: a case study in the Harz Mountains, Germany.\n \n \n \n \n\n\n \n Trautwein, J.; Rohde, L. R.; Militz, H.; and Brischke, C.\n\n\n \n\n\n\n Journal of Forestry Research, 36(1). July 2025.\n Publisher: Springer Science and Business Media LLC\n\n\n\n
\n\n\n\n \n \n \"OuterPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{trautwein_outer_2025,\n\ttitle = {Outer appearance of bark-beetle-infested stands of {Norway} spruce after different standing storage durations: a case study in the {Harz} {Mountains}, {Germany}},\n\tvolume = {36},\n\tcopyright = {https://creativecommons.org/licenses/by/4.0},\n\tissn = {1993-0607},\n\tshorttitle = {Outer appearance of bark-beetle-infested stands of {Norway} spruce after different standing storage durations},\n\turl = {https://link.springer.com/10.1007/s11676-025-01889-w},\n\tdoi = {10.1007/s11676-025-01889-w},\n\tabstract = {Abstract          Norway spruce (Picea abies (L.) Karst.) in the Harz Mountains National Park (Germany) has experienced widespread mortality ({\\textgreater} 97\\% of trees in the study stands) due to infestation with the large spruce bark beetle (Ips typographus L.). The dead trees (snags) remain standing in the forest for 2–5 years before harvesting. It is important to identify trees that can still produce quality timber, which may be achieved by examining their outer appearance using selected characteristics. The aim of this study was to identify possible correlations between the standing storage duration and defined external characteristics of the snags. The mean tree height at compartment level was calculated using a vegetation height model, based on light detection and ranging data from 2018, to derive the stem breakage proportion. The condition of the crown and the bark and presence of fungi, wood rot, stem cracks and bark stripping damage were also assessed. The majority of the snags were broken at least once. Windthrows were less likely compared to living spruce trees because of reduced resistance to the wind as a result of needle loss and breakage. The mean stem breakage proportion increased significantly with the duration of the standing storage; however, prolonged storage durations did not always lead to complete breakage. The occurrence of fungal fruiting bodies was significantly correlated with a higher proportion of stem breakage, and the longer the storage, the more snags had fungal fruiting bodies. The condition of the crown, assessed by the presence of branchlets, was a good indicator of the duration of the standing storage. If trees had few or no branchlets, they had been standing for at least 4 years. Overall, this initial description of the external appearance of spruce trees that have been stored standing for many years suggests that time significantly influences the tree condition and breakage intensity, which is reflected by certain tree characteristics. Future studies should examine these aspects in greater depth, particularly with regard to utilization options and safety during timber harvesting.},\n\tlanguage = {en},\n\tnumber = {1},\n\turldate = {2025-07-08},\n\tjournal = {Journal of Forestry Research},\n\tauthor = {Trautwein, Jan-Frederik and Rohde, Laurenz Rudolf and Militz, Holger and Brischke, Christian},\n\tmonth = jul,\n\tyear = {2025},\n\tnote = {Publisher: Springer Science and Business Media LLC},\n}\n\n
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\n Abstract Norway spruce (Picea abies (L.) Karst.) in the Harz Mountains National Park (Germany) has experienced widespread mortality (\\textgreater 97% of trees in the study stands) due to infestation with the large spruce bark beetle (Ips typographus L.). The dead trees (snags) remain standing in the forest for 2–5 years before harvesting. It is important to identify trees that can still produce quality timber, which may be achieved by examining their outer appearance using selected characteristics. The aim of this study was to identify possible correlations between the standing storage duration and defined external characteristics of the snags. The mean tree height at compartment level was calculated using a vegetation height model, based on light detection and ranging data from 2018, to derive the stem breakage proportion. The condition of the crown and the bark and presence of fungi, wood rot, stem cracks and bark stripping damage were also assessed. The majority of the snags were broken at least once. Windthrows were less likely compared to living spruce trees because of reduced resistance to the wind as a result of needle loss and breakage. The mean stem breakage proportion increased significantly with the duration of the standing storage; however, prolonged storage durations did not always lead to complete breakage. The occurrence of fungal fruiting bodies was significantly correlated with a higher proportion of stem breakage, and the longer the storage, the more snags had fungal fruiting bodies. The condition of the crown, assessed by the presence of branchlets, was a good indicator of the duration of the standing storage. If trees had few or no branchlets, they had been standing for at least 4 years. Overall, this initial description of the external appearance of spruce trees that have been stored standing for many years suggests that time significantly influences the tree condition and breakage intensity, which is reflected by certain tree characteristics. Future studies should examine these aspects in greater depth, particularly with regard to utilization options and safety during timber harvesting.\n
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\n \n\n \n \n \n \n \n Protection of stored roundwood: methods, efficacy of protective measures, and quality losses.\n \n \n \n\n\n \n Trautwein, J.; Militz, H.; Starke, N.; Günther, B.; Meurer, A.; and Brischke, C.\n\n\n \n\n\n\n Discover Forests, 1: 19. 2025.\n \n\n\n\n
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@article{trautwein_protection_2025,\n\ttitle = {Protection of stored roundwood: methods, efficacy of protective measures, and quality losses},\n\tvolume = {1},\n\tdoi = {https://doi.org/10.1007/s44415-025-00021-4},\n\tabstract = {The forestry and timber industry is increasingly confronted with large quantities of calamity round wood, which must be stored for longer periods of time and needs to be protected from losses of quality. This review provides an overview of today’s and potential future storage methods. Results from German recently completed and ongoing research projects on storage of round wood under foil, in-ground, dry and standing storage are presented and the different methods are evaluated against the background of the current framework conditions. Wet storage allows several years of conservation, but is not sustainable due to the decreasing availability of water and soil contamination due to washouts. Foil storage using the “Baden-Württemberg method” is more reliable but also more expensive than the “Swiss method” due to the complete exclusion of oxygen. Both methods have limitations with respect to the storage of logs from beetle infested trees. Earth storage is a new approach with successful oxygen reduction, but further research regarding the wood moisture is required. Leaving dead trees in the forest on stock, so called “standing storage” preserves wood by drying, but there is currently a lack of scientific findings. Live storage, in which the root ball of thrown trees remains on the trunk, preserves the wood quality over a vegetation period. “Calamity wood dry storage”, a special form of dry storage, is used for storage of bark beetle infested Norway spruce from months up to years.},\n\tlanguage = {en},\n\tjournal = {Discover Forests},\n\tauthor = {Trautwein, Jan-Frederik and Militz, Holger and Starke, Nicole and Günther, Björn and Meurer, Armin and Brischke, Christian},\n\tyear = {2025},\n\tpages = {19},\n\tfile = {PDF:/home/maicher/Zotero/storage/VE2VQNSL/Trautwein et al. - Protection of stored roundwood methods, efficacy of protective measures, and quality losses.pdf:application/pdf},\n}\n
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\n The forestry and timber industry is increasingly confronted with large quantities of calamity round wood, which must be stored for longer periods of time and needs to be protected from losses of quality. This review provides an overview of today’s and potential future storage methods. Results from German recently completed and ongoing research projects on storage of round wood under foil, in-ground, dry and standing storage are presented and the different methods are evaluated against the background of the current framework conditions. Wet storage allows several years of conservation, but is not sustainable due to the decreasing availability of water and soil contamination due to washouts. Foil storage using the “Baden-Württemberg method” is more reliable but also more expensive than the “Swiss method” due to the complete exclusion of oxygen. Both methods have limitations with respect to the storage of logs from beetle infested trees. Earth storage is a new approach with successful oxygen reduction, but further research regarding the wood moisture is required. Leaving dead trees in the forest on stock, so called “standing storage” preserves wood by drying, but there is currently a lack of scientific findings. Live storage, in which the root ball of thrown trees remains on the trunk, preserves the wood quality over a vegetation period. “Calamity wood dry storage”, a special form of dry storage, is used for storage of bark beetle infested Norway spruce from months up to years.\n
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\n  \n 2023\n \n \n (1)\n \n \n
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\n \n\n \n \n \n \n \n The use of bark beetle infested wood in Germany.\n \n \n \n\n\n \n Trautwein, J.; Militz, H.; and Brischke, C.\n\n\n \n\n\n\n In Proceedings of the 19th Meeting of the Northern European Network for Wood Science and Engineering (WSE), pages 133–135, Ås, Norway, October 2023. \n \n\n\n\n
\n\n\n\n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@inproceedings{trautwein_use_2023,\n\taddress = {Ås, Norway},\n\ttitle = {The use of bark beetle infested wood in {Germany}},\n\tbooktitle = {Proceedings of the 19th {Meeting} of the {Northern} {European} {Network} for {Wood} {Science} and {Engineering} ({WSE})},\n\tauthor = {Trautwein, Jan-Frederik and Militz, Holger and Brischke, Christian},\n\tmonth = oct,\n\tyear = {2023},\n\tpages = {133--135},\n}\n\n
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\n  \n 2022\n \n \n (2)\n \n \n
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\n \n\n \n \n \n \n \n Selbsthemmung keilgezinkter Laub- und Nadelvollhölzer unter besonderer Betrachtung der Rohdichte.\n \n \n \n\n\n \n Trautwein, J.\n\n\n \n\n\n\n Technical Report Wood Biology and Wood Products, Faculty of Forest Sciences and Forest Ecology, University of Goettingen, Göttingen, Germany, May 2022.\n \n\n\n\n
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@techreport{trautwein_selbsthemmung_2022,\n\taddress = {Göttingen, Germany},\n\ttype = {Master thesis},\n\ttitle = {Selbsthemmung keilgezinkter {Laub}- und {Nadelvollhölzer} unter besonderer {Betrachtung} der {Rohdichte}},\n\tlanguage = {ger},\n\tinstitution = {Wood Biology and Wood Products, Faculty of Forest Sciences and Forest Ecology, University of Goettingen},\n\tauthor = {Trautwein, Jan-Frederik},\n\tmonth = may,\n\tyear = {2022},\n\tpages = {80},\n\tfile = {Trautwein - 2022 - Selbsthemmung keilgezinkter Laub- und Nadelvollhöl.pdf:/home/maicher/Zotero/storage/R936F9KT/Trautwein - 2022 - Selbsthemmung keilgezinkter Laub- und Nadelvollhöl.pdf:application/pdf},\n}\n\n
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\n \n\n \n \n \n \n \n Self-locking of finger joints - Influence of density and moisture content.\n \n \n \n\n\n \n Stolze, H.; Trautwein, J.; Mayer, A. K.; Theis, V.; Bollmus, S.; and Militz, H.\n\n\n \n\n\n\n In Hardwood Conference Proceedings, pages 317–323, Sopron, Hungary, 2022. University of Sopron Press\n \n\n\n\n
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@inproceedings{stolze_self-locking_2022,\n\taddress = {Sopron, Hungary},\n\ttitle = {Self-locking of finger joints - {Influence} of density and moisture content},\n\tisbn = {978-963-334-446-0},\n\tlanguage = {EN},\n\tbooktitle = {Hardwood {Conference} {Proceedings}},\n\tpublisher = {University of Sopron Press},\n\tauthor = {Stolze, Hannes and Trautwein, Jan-Frederik and Mayer, Aaron Kilan and Theis, Viorica and Bollmus, Susanne and Militz, Holger},\n\tyear = {2022},\n\tpages = {317--323},\n}\n\n
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