scholarly journals Lessons learned from assessing the cover and yield of bilberry and lingonberry using the national forest inventories in Finland and Sweden

Silva Fennica ◽  
2021 ◽  
Vol 55 (5) ◽  
Author(s):  
Jari Miina ◽  
Inka Bohlin ◽  
Torgny Lind ◽  
Jonas Dahlgren ◽  
Kari Härkönen ◽  
...  
Keyword(s):  
National Forest Inventory ◽  
Lessons Learned ◽  
Accurate Information ◽  
National Forest ◽  
Management Scenarios ◽  
Model Based ◽  
Forest Inventories ◽  
National Forest Inventories ◽  
Forecasting System ◽  
Development And Management

Bilberry ( L.) and lingonberry ( L.) can be a part of healthy diet and are important for many animals. Two approaches are described to assessing their vegetation cover and berry yield via national forest inventory (NFI) observations. The aim was to provide estimates and predictions of the abundance and yield of the species at regional and national levels in Finland and Sweden. In Finland, the model-based predictions are used in evaluating the impacts of cutting intensity on forest berries needed in forest-related decision making. In Sweden, seasonal inventory-based estimates are used to evaluate the annual national and regional berry yields, and in a forecasting system aimed at large public and berry enterprises. Based on the NFI sample plots measured between 2014 and 2018, the total annual yields are estimated to be 208 Mkg of bilberry and 246 Mkg of lingonberry on productive forest land (increment at least 1 m ha year) in Finland, and 336 and 382 Mkg respectively in Sweden (average of NFI inventories in 2015–2019). The predicted development of berry yields is related to the intensity of cuttings in alternative forest management scenarios: lower removals favoured bilberry, and higher removals lingonberry. The model-based method describes the effects of stand development and management on berry yields, whereas the inventory-based method can calibrate seasonal estimates through field observations. In providing spatially and timely more accurate information concerning seasonal berry yields, an assessment of berry yields should involve the elements of both inventory-based and model-based approaches described in this study.Vaccinium myrtillusV. vitis-idaea3–1–1

scholarly journals Catering Information Needs from Global to Local Scales—Potential and Challenges with National Forest Inventories

Forests ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 800 ◽  
Author(s):  
Kangas ◽  
Räty ◽  
Korhonen ◽  
Vauhkonen ◽  
Packalen
Keyword(s):  
Information Needs ◽  
National Forest ◽  
Model Errors ◽  
Sampling Errors ◽  
Small Areas ◽  
Model Based ◽  
Forest Inventories ◽  
National Forest Inventories ◽  
Biased Estimators ◽  
National Information

Forest information is needed at global, national and local scales. This review aimed at providing insights of potential of national forest inventories (NFIs) as well as challenges they have to cater to those needs. Within NFIs, the authors address the methodological challenges introduced by the multitude of scales the forest data are needed, and the challenges in acknowledging the errors due to the measurements and models in addition to sampling errors. Between NFIs, the challenges related to the different harmonization tasks were reviewed. While a design-based approach is often considered more attractive than a model-based approach as it is guaranteed to provide unbiased results, the model-based approach is needed for downscaling the information to smaller scales and acknowledging the measurement and model errors. However, while a model-based inference is possible in small areas, the unknown random effects introduce biased estimators. The NFIs need to cater for the national information requirements and maintain the existing time series, while at the same time providing comparable information across the countries. In upscaling the NFI information to continental and global information needs, representative samples across the area are of utmost importance. Without representative data, the model-based approaches enable provision of forest information with unknown and indeterminable biases. Both design-based and model-based approaches need to be applied to cater to all information needs. This must be accomplished in a comprehensive way In particular, a need to have standardized quality requirements has been identified, acknowledging the possibility for bias and its implications, for all data used in policy making.

The applicability of national forest inventories for estimating forest damage outbreaks – Experiences from a Gremmeniella outbreak in Sweden

2006 ◽  
Vol 36 (10) ◽  
pp. 2605-2613 ◽  
Author(s):  
Sören Wulff ◽  
Per Hansson ◽  
Jesper Witzell
Keyword(s):  
Geographical Distribution ◽  
Pinus Contorta ◽  
National Forest Inventory ◽  
Forest Damage ◽  
Distribution Area ◽  
National Forest ◽  
Accurate Identification ◽  
Forest Inventories ◽  
Shoot Blight ◽  
National Forest Inventories

The design of the Swedish National Forest Inventory as well as the National Forest Damage Inventory is a sparse sample of systematically allocated plots. In this study data were combined from these two independent inventories to estimate geographical distribution, area extension, and disease development of a Gremmeniella abietina (Lagerb.) Morelet epidemic. For the combined data the standard error for estimated total area of affected Scots pine (Pinus sylvestris L.) and lodgepole pine (Pinus contorta Dougl. ex Loud. var.latifolia Engelm.) forests was about 11%. Assessments of the proportion of pine trees with fresh shoot blight infection shows that changes larger than 1% are significantly (p < 0.05) estimated. By testing in pairwise cross inventory, it was shown that the accuracy of the assessment of total shoot blight symptoms was fairly good in 2001–2002, with a κ statistic of 0.59–0.61. Severely damaged trees were identified with an agreement of κ = 0.81. The total area of pine forest both slightly and severely affected by G. abietina during 2001–2003 was estimated to be 484 000 ha. Three geographically separate damage centres were distinguished. Thus, despite a relatively sparse sample plot density, the national forest inventories have good potential for estimating the geographical distribution, areal extent, and dispersal of extensive damage outbreak. Results are dependent on the inventories being carried out with an accurate identification of target objects.

scholarly journals A century of national forest inventories – informing past, present and future decisions

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Johannes Breidenbach ◽  
Ronald E. McRoberts ◽  
Iciar Alberdi ◽  
Clara Antón-Fernández ◽  
Erkki Tomppo
Keyword(s):  
Forest Inventory ◽  
Policy Making ◽  
Terrestrial Ecosystems ◽  
National Forest Inventory ◽  
100Th Anniversary ◽  
Future Research ◽  
National Forest ◽  
Forest Inventories ◽  
National Forest Inventories ◽  
Over Exploitation

AbstractIn 2019, 100 years had elapsed since the first National Forest Inventory (NFI) was established in Norway. Motivated by a fear of over-exploitation of timber resources, NFIs today enable informed policy making by providing data vital to decision support at international, national, regional, and local scales. This Collection of articles celebrates the 100th anniversary of NFIs with a description of past, present, and future research aiming at improving the monitoring of forest and other terrestrial ecosystems.

scholarly journals The National Forest Inventory of Serbia: State and possible further directions of development

2015 ◽  
pp. 9-32
Author(s):  
Damjan Pantic ◽  
Dragan Borota
Keyword(s):  
National Forest Inventory ◽  
National Forest ◽  
Successful Implementation ◽  
Forest Inventories ◽  
Harmonization Process ◽  
Process Adaptation ◽  
National Forest Inventories ◽  
Methodological Problems ◽  
Definition Of ◽  
Further Development

A comparative analysis of National Forest Inventories (NFI) of many countries, including Serbia was made in the manuscript, in terms of methodology and in terms of the definition of different information collected about forest ecosystems. Further development of the NFI Serbia was also analyzed. It was determined that there are differences in national methodologies, but that they are not substantial and do not constitute an obstacle to the creation of uniform databases of forests at the regional and global levels as a prerequisite for political and professional action aimed at protecting and ensuring sustainability of all forest functions. Contrary to that, differences between national definitions for information that are collected by inventory are numerous, distinct and as such represent a major obstacle to the mentioned aspirations. The solution of the problem is standardization, i.e. in the far more acceptable harmonization process (adaptation) NFI, whereby such frameworks of that activity are imposed by the FAO (globally) and COST Action E43 (mainly in the European region). NFI Serbia, on the threshold of second realization, is burdened with a numerous institutional, organizational and methodological problems and dilemmas, inherited from the first measurement of Serbian forests. Therefore, an urgent recruitment of relevant experts is necessary to resolve and overcome problems, in order to ensure all the prerequisites for a successful implementation and obtaining reliable data of the second NFI, so that the future NFI can be alleviated of the conditions in which it is currently located.

scholarly journals Harmonising, improving and using social and recreational data in National Forest Inventories across Europe

2020 ◽  
Vol 77 (3) ◽  
Author(s):  
Mark A. Atkinson ◽  
David M. Edwards ◽  
Frank Søndergaard Jensen ◽  
Alexander P. N. van der Jagt ◽  
Ben R. Ditchburn ◽  
...  
Keyword(s):  
National Level ◽  
European Countries ◽  
Transport Infrastructure ◽  
National Forest ◽  
Qualitative Response ◽  
Forest Inventories ◽  
Recreational Services ◽  
National Forest Inventories ◽  
Funded Project ◽  
General Transport

Abstract Key message National Forest Inventories (NFIs) hold promise for monitoring and valuing of non-productive forest functions, including social and recreational services. European countries use a range of methods to collect social and recreational information within their NFI methodologies. Data collected frequently included general and recreation-specific infrastructure, but innovative approaches are also used to monitor recreational use and social abuse. Context Social and recreational indicators are increasingly valued in efforts to measure the non-productive value of forests in Europe. National Forest Inventories (NFIs) can be used to estimate recreational and social usage of forest land at a national level and relate this use to other biophysical, spatial and topographical features. Nonetheless, there is little information concerning the extent. Aims The study aims to identify the coverage of social and recreational data present in European NFIs including the types of data recorded as part of the NFI methodologies across European countries. It also aims to examine contrasting methods used to record social and recreational data and present recommendations for ways forward for countries to integrate these into NFI practice. Methods A pan-European questionnaire was designed and distributed to 35 counties as part of the EU-funded project Distributed, Integrated and Harmonised Forest Information for Bioeconomy Outlooks (DIABOLO). The questionnaire probed countries on all social and recreational data that was included within NFIs. Qualitative response data was analysed and recoded to measure the extent of social and recreational data recoded in European NFIs both as a function of the number of variable categories per country and the number of countries recording particular variables. Results Thirty-one countries reported at least one social or recreational variable over 12 categories of data. The most frequently recorded variables included ownership, general transport infrastructure and recreation-specific infrastructure. Countries collecting data over many different categories included Switzerland, Great Britain, Czech Republic, Luxemburg and Denmark. Conclusion The study proposes a specific set of indicators, based upon countries with well-developed social and recreational data in their NFIs, which could be used by other countries, and report on the extent to which these are currently collected across Europe. It discusses results and makes a series of recommendations concerning priorities for the inclusion of social and recreational data in European NFIs.

scholarly journals Integrating data from National Forest Inventories into socio-cultural forest monitoring – a new approach

2020 ◽  
Vol 35 (5-6) ◽  
pp. 274-285
Author(s):  
K. Tessa Hegetschweiler ◽  
Christoph Fischer ◽  
Marco Moretti ◽  
Marcel Hunziker
Keyword(s):  
Forest Monitoring ◽  
National Forest ◽  
New Approach ◽  
Forest Inventories ◽  
National Forest Inventories

scholarly journals Zur Auswirkung der Hangneigungskorrektur auf Schätzwerte im Schweizerischen Landesforstinventar (LFI) | Investigation of the effect of the slope correction method as applied in the Swiss National Forest Inventory of estimates

2001 ◽  
Vol 152 (6) ◽  
pp. 215-225 ◽  
Author(s):  
Michael Köhl ◽  
Peter Brassel
Keyword(s):  
Forest Inventory ◽  
Basal Area ◽  
Correction Method ◽  
National Forest Inventory ◽  
National Forest ◽  
Average Deviation ◽  
Forest Inventories ◽  
Slope Correction ◽  
Number Of Stems ◽  
Elliptical Area

For forest inventories on slopes, it is necessary to correct the test areas, because the circular areas, when projected, become elliptical. Based on 93 samples from the Swiss National Forest Inventory (FNI), it was determined whether the simplified method, which increases the radius to match that of the elliptical area, leads to a distortion of the results. An average deviation of 2% was found between the FNI estimated values and the actual values for the basal area and the number of stems. For estimations of smaller units, greater distortions of the results are expected.

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