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Maintenance of long-term experiments for unique insights into forest growth dynamics and trends: review and perspectives

Pretzsch, Hans and del Rio, Miren and Biber, Peter and Arcangeli, Catia and Bielak, Kamil and Brang, Peter and Dudzinska, Malgorzata and Forrester, David Ian and Klaedtke, Joachim and Kohnle, Ulrich and Ledermann, Thomas and Matthews, Robert and Nagel, Juergen and Nilsson, Urban and Ningre, Francois and Nord-Larsen, Thomas and Wernsdorfer, Holger and Sycheva, Ekaterina (2019). Maintenance of long-term experiments for unique insights into forest growth dynamics and trends: review and perspectives. European Journal of Forest Research. 138 , 165-185
[Article Review/Survey]

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Abstract

In this review, the unique features and facts of long-term experiments are presented. Long-term experimental plots provide information of forest stand dynamics which cannot be derived from forest inventories or small temporary plots. Most comprise unthinned plots which represent the site specific maximum stand density as an unambiguous reference. By measuring the remaining as well as the removed stand, the survey of long-term experiments provides the total production at a given site, which is most relevant for examining the relationship between site conditions and stand productivity on the one hand and between stand density and productivity on the other. Thus, long-term experiments can reveal the site-specific effect of thinning and species mixing on stand structure, production and carbon sequestration. If they cover an entire rotation or even the previous and following generation on a given site, they reveal a species' long-term behaviour and any growth trends caused by environmental changes. Second, we exploit the unique data of European long-term experiments, some of which have been surveyed since 1848. We show the long-term effect of different density regimes on stand dynamics and an essential trade-off between total stand volume production and mean tree size. Long-term experiments reveal that tree species mixing can significantly increase stand density and productivity compared with monospecific stands. Thanks to surveys spanning decades or even a century, we can show the changing long-term-performance of different provenances and acceleration of stand production caused by environmental change, as well as better understand the growth dynamics of natural forests. Without long-term experiments forest science and practice would be not in a position to obtain such findings which are of the utmost relevance for science and practice. Third, we draw conclusions and show perspectives regarding the maintenance and further development of long-term experiments. It would require another 150years to build up a comparable wealth of scientific information, practical knowledge, and teaching and training model examples. Although tempting, long-term experiments should not be sacrificed for cost-cutting measures. Given the global environmental change and the resulting challenges for sustainable management, the network of long-term experiments should rather be extended regarding experimental factors, recorded variables and inter- and transdisciplinary use for science and practice.

Authors/Creators:Pretzsch, Hans and del Rio, Miren and Biber, Peter and Arcangeli, Catia and Bielak, Kamil and Brang, Peter and Dudzinska, Malgorzata and Forrester, David Ian and Klaedtke, Joachim and Kohnle, Ulrich and Ledermann, Thomas and Matthews, Robert and Nagel, Juergen and Nilsson, Urban and Ningre, Francois and Nord-Larsen, Thomas and Wernsdorfer, Holger and Sycheva, Ekaterina
Title:Maintenance of long-term experiments for unique insights into forest growth dynamics and trends: review and perspectives
Year of publishing :2019
Volume:138
Page range:165-185
Number of Pages:21
Publisher:Springer
ISSN:1612-4669
Language:English
Publication Type:Article Review/Survey
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:Unthinned stands, Total stand volume production, Maximum stand density, Density-growth relationship, Mixing effects, Growth trends, Biomonitoring, Silvicultural guidelines
URN:NBN:urn:nbn:se:slu:epsilon-p-105956
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-105956
Additional ID:
Type of IDID
DOI10.1007/s10342-018-1151-y
Web of Science (WoS)000459052400013
ID Code:17148
Faculty:S - Faculty of Forest Sciences
Department:(S) > Southern Swedish Forest Research Centre
Deposited By: SLUpub Connector
Deposited On:26 Jun 2020 12:42
Metadata Last Modified:26 Jun 2020 12:42

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