Pub Date : 2023-06-27DOI: 10.1080/02827581.2023.2225870
Fernando Castedo‐Dorado, P. Rodríguez-Gonzálvez, E. González-Ferreiro, Guillermo Ramos-González, R. Álvarez-Esteban, Flor Álvarez-Taboada
ABSTRACT Populus spp. clones and hybrids are commonly cultivated for timber production worldwide due to their fast growth and adaptability. In Spain, growth models are currently available for the Populus × euramericana clones ‘I-214' and ‘MC'. However, the input variables required for these models are not typically available to potential users. For the most widely used P. × interamericana clones ('Beaupre', ‘Raspalje' and ‘Unal') there is currently no growth model available in Spain or elsewhere in Europe. The aim of the present study was to develop a whole-stand growth model for these five clones. Data were obtained from a network of 134 plots and 265 trees scanned by Terrestrial Laser Scanning. The structure of the growth model was mediated by plot data typically available from forest owners: plantation age, number of trees of each clone and arithmetic mean tree diameter (dm). The main component of the growth model is a dm projection function, enabling dm to be projected at any time. Sensitivity analysis of the prediction accuracy of this function revealed that the proposed model provides satisfactory predictions for time intervals of between 5 and 10 years. The growth model was implemented in a web-based plot growth simulator, facilitating its use.
{"title":"A user-driven, reduced whole-stand growth model for major hybrid poplar clones in Spain","authors":"Fernando Castedo‐Dorado, P. Rodríguez-Gonzálvez, E. González-Ferreiro, Guillermo Ramos-González, R. Álvarez-Esteban, Flor Álvarez-Taboada","doi":"10.1080/02827581.2023.2225870","DOIUrl":"https://doi.org/10.1080/02827581.2023.2225870","url":null,"abstract":"ABSTRACT Populus spp. clones and hybrids are commonly cultivated for timber production worldwide due to their fast growth and adaptability. In Spain, growth models are currently available for the Populus × euramericana clones ‘I-214' and ‘MC'. However, the input variables required for these models are not typically available to potential users. For the most widely used P. × interamericana clones ('Beaupre', ‘Raspalje' and ‘Unal') there is currently no growth model available in Spain or elsewhere in Europe. The aim of the present study was to develop a whole-stand growth model for these five clones. Data were obtained from a network of 134 plots and 265 trees scanned by Terrestrial Laser Scanning. The structure of the growth model was mediated by plot data typically available from forest owners: plantation age, number of trees of each clone and arithmetic mean tree diameter (dm). The main component of the growth model is a dm projection function, enabling dm to be projected at any time. Sensitivity analysis of the prediction accuracy of this function revealed that the proposed model provides satisfactory predictions for time intervals of between 5 and 10 years. The growth model was implemented in a web-based plot growth simulator, facilitating its use.","PeriodicalId":21352,"journal":{"name":"Scandinavian Journal of Forest Research","volume":"38 1","pages":"329 - 343"},"PeriodicalIF":1.8,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48327204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-19DOI: 10.1080/02827581.2023.2225871
E. Olofsson, R. Jakobsson
ABSTRACT Private forest owners’ management decisions significantly impact the development of forest values in Sweden. This study explored the potential to develop environmental values on privately owned land in southern Sweden. Data were collected through interviews with 23 forest owners and analyzed with semantic content analysis. The interviewees owned estates of productive, predominantly coniferous forest ranging in size from 10–825 ha. They were aged 36–84, and 26% were female. Results showed that there is considerable potential to develop environmental values on private land since 1) Forest owners demonstrated multi-functional views of primarily social and emotional dimensions surrounding forest ownership, and the mindset of combining goals enables many different values to be developed, 2) Desired management showed numerous ideas that could bring a diversity of benefits, and 3) Practical management included various production-favoring measures, but even more for environmental, social, cultural, and emotional purposes that, largely unnoted, bring environmental conservation benefits. All forest owners perceived barriers to management and ownership, categorized primarily to structural or surrounding society factors. Financial incentives, policies encouraging forest owners’ initiatives, an adequate supply of resources and sound management advice are suggested measures to reduce barriers and facilitate the development of environmental values.
{"title":"The potential to develop environmental values on privately owned forest land in southern Sweden","authors":"E. Olofsson, R. Jakobsson","doi":"10.1080/02827581.2023.2225871","DOIUrl":"https://doi.org/10.1080/02827581.2023.2225871","url":null,"abstract":"ABSTRACT Private forest owners’ management decisions significantly impact the development of forest values in Sweden. This study explored the potential to develop environmental values on privately owned land in southern Sweden. Data were collected through interviews with 23 forest owners and analyzed with semantic content analysis. The interviewees owned estates of productive, predominantly coniferous forest ranging in size from 10–825 ha. They were aged 36–84, and 26% were female. Results showed that there is considerable potential to develop environmental values on private land since 1) Forest owners demonstrated multi-functional views of primarily social and emotional dimensions surrounding forest ownership, and the mindset of combining goals enables many different values to be developed, 2) Desired management showed numerous ideas that could bring a diversity of benefits, and 3) Practical management included various production-favoring measures, but even more for environmental, social, cultural, and emotional purposes that, largely unnoted, bring environmental conservation benefits. All forest owners perceived barriers to management and ownership, categorized primarily to structural or surrounding society factors. Financial incentives, policies encouraging forest owners’ initiatives, an adequate supply of resources and sound management advice are suggested measures to reduce barriers and facilitate the development of environmental values.","PeriodicalId":21352,"journal":{"name":"Scandinavian Journal of Forest Research","volume":"38 1","pages":"300 - 315"},"PeriodicalIF":1.8,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44808262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-02DOI: 10.1080/02827581.2023.2219461
N. Erkan, Edanur Ayhan
ABSTRACT This study aimed to (1) investigate the long-term results of Cedrus libani + Pinus nigra mixed afforestation and (2) compare it with pure P. nigra afforestation in terms of wood production, economic return, and carbon (C) sequestration. The study was conducted in Elazığ-Sivrice, southeastern Turkey. Data were collected from six sample plots, and stem analysis for each species in the mixed stand was performed to reveal the growth and development of the basal-area-averaged trees. Statistical analyses showed that the pure P. nigra stands were superior to the mixed stands in terms of wood production (236 m3 ha−1 vs. 150 m3 ha−1), wood economic value ($19,551 ha−1 vs. $11,483 ha−1), and C sequestration (93 t ha−1 vs. 64 t C ha−1) at 54 years old. The lower values calculated for the mixed stand may have been due to the incompatible growth curves of the two species. These results imply that if the aim is to obtain wood products, pure P. nigra stands may be more advantageous than mixtures of C. libani and P. nigra for afforestation.
摘要:本研究旨在(1)研究杉木+黑松混合造林的长期效果，(2)与纯黑松造林在木材产量、经济效益和碳(C)固存方面进行比较。这项研究在土耳其东南部的Elazığ-Sivrice进行。利用6个样地的数据，对混交林各树种进行了茎干分析，揭示了基区平均树木的生长发育情况。统计分析表明，纯黑松林在木材产量(236 m3 ha - 1比150 m3 ha - 1)、木材经济价值(19,551 ha - 1美元比11,483 ha - 1美元)和54岁时碳固存(93 tha - 1比64 t C - ha - 1)方面优于混合林分。混交林的计算值较低可能是由于两种树种的生长曲线不相容。这些结果表明，如果目的是获得木材产品，纯黑桫椤林分可能比黑桫椤和黑桫椤混合林分更有利于造林。
{"title":"Growth rate and economic evaluation of mixed stands established with Cedrus libani and Pinus nigra","authors":"N. Erkan, Edanur Ayhan","doi":"10.1080/02827581.2023.2219461","DOIUrl":"https://doi.org/10.1080/02827581.2023.2219461","url":null,"abstract":"ABSTRACT This study aimed to (1) investigate the long-term results of Cedrus libani + Pinus nigra mixed afforestation and (2) compare it with pure P. nigra afforestation in terms of wood production, economic return, and carbon (C) sequestration. The study was conducted in Elazığ-Sivrice, southeastern Turkey. Data were collected from six sample plots, and stem analysis for each species in the mixed stand was performed to reveal the growth and development of the basal-area-averaged trees. Statistical analyses showed that the pure P. nigra stands were superior to the mixed stands in terms of wood production (236 m3 ha−1 vs. 150 m3 ha−1), wood economic value ($19,551 ha−1 vs. $11,483 ha−1), and C sequestration (93 t ha−1 vs. 64 t C ha−1) at 54 years old. The lower values calculated for the mixed stand may have been due to the incompatible growth curves of the two species. These results imply that if the aim is to obtain wood products, pure P. nigra stands may be more advantageous than mixtures of C. libani and P. nigra for afforestation.","PeriodicalId":21352,"journal":{"name":"Scandinavian Journal of Forest Research","volume":"38 1","pages":"344 - 351"},"PeriodicalIF":1.8,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46886188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-19DOI: 10.1080/02827581.2023.2215545
Jiali Nie, Shuai Liu
ABSTRACT In forest resource inventory, tree height is often estimated by easily measurable diameter from height-diameter model. In this study, we tried to use random forest (RF), an important machine learning method, to model individual-tree height. Results showed that the optimized RF model had better fitting and prediction accuracy (R 2 = 0.8146 and RMSE = 2.2527 m). In terms of relative importance, diameter at breast height (DBH) was the most important factor, followed by neighborhood-related variables and other variables related to environmental conditions. Further, tree height was generally positively affected by DBH, mean diameter of neighbors, DBH dominance, number of neighbors, and mean annual precipitation, but negatively affected by elevation. The results indicated that the RF-based height model was statistically reliable and highly accurate, and it had strong interpretability with ecological significance. Our study will provide a new perspective for the application of machine learning algorithms to forest dynamic modeling.
{"title":"Incorporated neighborhood and environmental effects to model individual-tree height using random forest regression","authors":"Jiali Nie, Shuai Liu","doi":"10.1080/02827581.2023.2215545","DOIUrl":"https://doi.org/10.1080/02827581.2023.2215545","url":null,"abstract":"ABSTRACT In forest resource inventory, tree height is often estimated by easily measurable diameter from height-diameter model. In this study, we tried to use random forest (RF), an important machine learning method, to model individual-tree height. Results showed that the optimized RF model had better fitting and prediction accuracy (R 2 = 0.8146 and RMSE = 2.2527 m). In terms of relative importance, diameter at breast height (DBH) was the most important factor, followed by neighborhood-related variables and other variables related to environmental conditions. Further, tree height was generally positively affected by DBH, mean diameter of neighbors, DBH dominance, number of neighbors, and mean annual precipitation, but negatively affected by elevation. The results indicated that the RF-based height model was statistically reliable and highly accurate, and it had strong interpretability with ecological significance. Our study will provide a new perspective for the application of machine learning algorithms to forest dynamic modeling.","PeriodicalId":21352,"journal":{"name":"Scandinavian Journal of Forest Research","volume":"38 1","pages":"221 - 231"},"PeriodicalIF":1.8,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42963362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-19DOI: 10.1080/02827581.2023.2216946
J. Siitonen, Hannes Pasanen, Matti Ylänne, L. Saaristo
ABSTRACT Many forestry practitioners need information on the amount of dead wood for various purposes, often at the level of individual stands. Our aim was to compare four simple dead-wood inventory methods of which systematic circular plot inventory is a well-known method, while relascope plot inventory (using the ordinary horizontal angle relascope also for downed trees), diameter class counting and total inventory are new methods. Seven surveyors tested the methods in four stands in southern Finland. All the methods produced rather accurate volume estimates. Mean percent error was the smallest (−5.7%) in total inventory and the largest (−12.4%) in diameter class counting. Precision differed significantly between the methods. Variation among individual measurements, expressed as percentage SD, was 15.9% in total inventory, 24.8% in diameter counting, 36.6% in relascope inventory and 43.0% in circular plot inventory. Diameter counting was by far the fastest method. Relascope inventory and circular plot inventory took about twice as much time, and total inventory over three times as much time as diameter counting. In conclusion, diameter class counting is a cost-effective dead-wood assessment method, if the purpose is to get an estimate of the total volume of dead wood within a forest stand with a reasonable precision.
{"title":"Comparison of four alternative survey methods in assessing dead wood at the stand level","authors":"J. Siitonen, Hannes Pasanen, Matti Ylänne, L. Saaristo","doi":"10.1080/02827581.2023.2216946","DOIUrl":"https://doi.org/10.1080/02827581.2023.2216946","url":null,"abstract":"ABSTRACT\u0000 Many forestry practitioners need information on the amount of dead wood for various purposes, often at the level of individual stands. Our aim was to compare four simple dead-wood inventory methods of which systematic circular plot inventory is a well-known method, while relascope plot inventory (using the ordinary horizontal angle relascope also for downed trees), diameter class counting and total inventory are new methods. Seven surveyors tested the methods in four stands in southern Finland. All the methods produced rather accurate volume estimates. Mean percent error was the smallest (−5.7%) in total inventory and the largest (−12.4%) in diameter class counting. Precision differed significantly between the methods. Variation among individual measurements, expressed as percentage SD, was 15.9% in total inventory, 24.8% in diameter counting, 36.6% in relascope inventory and 43.0% in circular plot inventory. Diameter counting was by far the fastest method. Relascope inventory and circular plot inventory took about twice as much time, and total inventory over three times as much time as diameter counting. In conclusion, diameter class counting is a cost-effective dead-wood assessment method, if the purpose is to get an estimate of the total volume of dead wood within a forest stand with a reasonable precision.","PeriodicalId":21352,"journal":{"name":"Scandinavian Journal of Forest Research","volume":"38 1","pages":"244 - 253"},"PeriodicalIF":1.8,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48575128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-19DOI: 10.1080/02827581.2023.2211806
Lenka Marcineková (nee Navrátilová), P. Palátová, Jozef Výbošťok, V. Jarský, M. Riedl, Blanka Giertliova, R. Dudík, Jaroslav Šálka
ABSTRACT This study focuses on the issues of bioeconomy perception of students at forestry faculties in Slovakia and the Czech Republic. Bioeconomy is seen as a great window of opportunities, hence there is increased demand for bioeconomy education. This paper can help answer this demand and improve the curricula of universities providing bioeconomy-related education. The survey was conducted at the Technical University in Zvolen and the Czech University of Life Sciences Prague among 367 students. The results show that 70% of students have heard about bioeconomy, while this number is significantly higher amongst Slovak students. Considering bioeconomy awareness, we identified significant differences between different study programmes. The main information source about the bioeconomy issues turns out to be university courses followed by news. Czech students turned out to be less satisfied with bioeconomy involvement in curricula, and who also find it necessary to increase bioeconomy focus within their study curriculum. Our results show that targeted communication of bioeconomy is a key factor for general acceptance of bioeconomy and its further development among students and the general public. The results obtained can be used to increase the extent to which bioeconomy is being addressed in study programmes within the analysed universities.
{"title":"Students’ perception of bioeconomy as an important factor in communicating and further development of the bioeconomy in Slovakia and the Czech Republic","authors":"Lenka Marcineková (nee Navrátilová), P. Palátová, Jozef Výbošťok, V. Jarský, M. Riedl, Blanka Giertliova, R. Dudík, Jaroslav Šálka","doi":"10.1080/02827581.2023.2211806","DOIUrl":"https://doi.org/10.1080/02827581.2023.2211806","url":null,"abstract":"ABSTRACT This study focuses on the issues of bioeconomy perception of students at forestry faculties in Slovakia and the Czech Republic. Bioeconomy is seen as a great window of opportunities, hence there is increased demand for bioeconomy education. This paper can help answer this demand and improve the curricula of universities providing bioeconomy-related education. The survey was conducted at the Technical University in Zvolen and the Czech University of Life Sciences Prague among 367 students. The results show that 70% of students have heard about bioeconomy, while this number is significantly higher amongst Slovak students. Considering bioeconomy awareness, we identified significant differences between different study programmes. The main information source about the bioeconomy issues turns out to be university courses followed by news. Czech students turned out to be less satisfied with bioeconomy involvement in curricula, and who also find it necessary to increase bioeconomy focus within their study curriculum. Our results show that targeted communication of bioeconomy is a key factor for general acceptance of bioeconomy and its further development among students and the general public. The results obtained can be used to increase the extent to which bioeconomy is being addressed in study programmes within the analysed universities.","PeriodicalId":21352,"journal":{"name":"Scandinavian Journal of Forest Research","volume":"38 1","pages":"265 - 274"},"PeriodicalIF":1.8,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49115179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-19DOI: 10.1080/02827581.2023.2216021
Qinggui Wang, Guancheng Liu, Peng Qu, G. Yan, Y. Xing
ABSTRACT In early spring, because the tree and shrub layers are still dormant, the absorption of nutrients by herbs is the key factor to maintain nutrients in temperate forest ecosystems, but it is not clear whether climate change will change the nutrient uptake strategy of herbs. Therefore, we measured the biomass, fine root morphology, and stoichiometry of five dominant herbs in response to environmental changes in early spring in a temperate forest in northeastern China. The results showed that (1) Fine root morphology had strong plasticity. Under nitrogen addition treatment, the herbs tended to change the fine root length to absorb soil nutrients and water. (2) Under drought treatment, the herbs distributed more biomass to the belowground. Maintaining a higher root-shoot ratio might increase the relative supply of water to the herbs. (3) Nitrogen addition significantly decreased the belowground biomass allocation, but increased the ratio of belowground nitrogen to phosphorus (N:P) and the root metabolic activity. (4) Ephemeral herbaceous fine root morphology was more sensitive to water and nitrogen than other herbaceous plants. Collectively, in the context of climate change, early spring herbs may respond to environmental pressure through self-regulation and change growth strategies in temperate forest ecosystems.
{"title":"Long-term nitrogen addition and drought altered root trait and plant biomass allocation of five herbs in early spring in a temperate forest","authors":"Qinggui Wang, Guancheng Liu, Peng Qu, G. Yan, Y. Xing","doi":"10.1080/02827581.2023.2216021","DOIUrl":"https://doi.org/10.1080/02827581.2023.2216021","url":null,"abstract":"ABSTRACT In early spring, because the tree and shrub layers are still dormant, the absorption of nutrients by herbs is the key factor to maintain nutrients in temperate forest ecosystems, but it is not clear whether climate change will change the nutrient uptake strategy of herbs. Therefore, we measured the biomass, fine root morphology, and stoichiometry of five dominant herbs in response to environmental changes in early spring in a temperate forest in northeastern China. The results showed that (1) Fine root morphology had strong plasticity. Under nitrogen addition treatment, the herbs tended to change the fine root length to absorb soil nutrients and water. (2) Under drought treatment, the herbs distributed more biomass to the belowground. Maintaining a higher root-shoot ratio might increase the relative supply of water to the herbs. (3) Nitrogen addition significantly decreased the belowground biomass allocation, but increased the ratio of belowground nitrogen to phosphorus (N:P) and the root metabolic activity. (4) Ephemeral herbaceous fine root morphology was more sensitive to water and nitrogen than other herbaceous plants. Collectively, in the context of climate change, early spring herbs may respond to environmental pressure through self-regulation and change growth strategies in temperate forest ecosystems.","PeriodicalId":21352,"journal":{"name":"Scandinavian Journal of Forest Research","volume":"38 1","pages":"232 - 243"},"PeriodicalIF":1.8,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45860396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-19DOI: 10.1080/02827581.2023.2216945
M. Lähdesmäki, Anne Matilainen, Pekka Lehto
ABSTRACT Parcelisation-induced fragmentation is a common development trend in forest ownership in many Western countries. In Finland, the idea of a jointly-owned forest (JOF) has been introduced to facilitate the effective management of forest resource in parcelised and fragmented forest owning contexts. A JOF is an area of combined holdings intended for the practice of sustainable forestry for the benefit of the shareholders. The establishment of JOFs alters the core idea of ownership as it diminishes individual forest owners’ ability to control their holdings. We suggest that the feelings of ownership are important, yet under researched, aspects in the development and operation of JOFs. In this study, we focus on these ownership feelings by asking what kind of owner types are associated with JOFs. We build a qualitative typology of four owner types which we named active owners, investors, legacy fosterers, and detached owners. Our study contributes to the discussion on JOFs by showing that shared ownership can incorporate a variety of owner types with different ownership feelings. We claim that the need to understand these different owner types is important to facilitate the development of tools and policy instruments that will contribute to the establishment and management of jointly-owned forests.
{"title":"Forest owner or shareholder? Ownership feelings in a jointly-owned forest","authors":"M. Lähdesmäki, Anne Matilainen, Pekka Lehto","doi":"10.1080/02827581.2023.2216945","DOIUrl":"https://doi.org/10.1080/02827581.2023.2216945","url":null,"abstract":"ABSTRACT\u0000 Parcelisation-induced fragmentation is a common development trend in forest ownership in many Western countries. In Finland, the idea of a jointly-owned forest (JOF) has been introduced to facilitate the effective management of forest resource in parcelised and fragmented forest owning contexts. A JOF is an area of combined holdings intended for the practice of sustainable forestry for the benefit of the shareholders. The establishment of JOFs alters the core idea of ownership as it diminishes individual forest owners’ ability to control their holdings. We suggest that the feelings of ownership are important, yet under researched, aspects in the development and operation of JOFs. In this study, we focus on these ownership feelings by asking what kind of owner types are associated with JOFs. We build a qualitative typology of four owner types which we named active owners, investors, legacy fosterers, and detached owners. Our study contributes to the discussion on JOFs by showing that shared ownership can incorporate a variety of owner types with different ownership feelings. We claim that the need to understand these different owner types is important to facilitate the development of tools and policy instruments that will contribute to the establishment and management of jointly-owned forests.","PeriodicalId":21352,"journal":{"name":"Scandinavian Journal of Forest Research","volume":"38 1","pages":"254 - 264"},"PeriodicalIF":1.8,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43816297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-19DOI: 10.1080/02827581.2023.2208874
Lin Yang, Qiuliang Zhang, H. Jin, Zhongtao Ma, Xiaoying Jin, S. S. Marchenko, R. He, V. Spektor, X. Chang
ABSTRACT Under a warming climate, the studies on effects of seasonal freeze–thaw cycles on soil respiration are key to understanding the soil carbon cycles and ecosystem responses and resilience at mid- and high latitudes. In this study, the effluxes of soil surface CO2 and absorption rates of CH4 were measured in the Xing'an larch (Larix gmelinii) forest in the northern Da Xing’anling Mountains, Northeast China using an automatic multichannel soil greenhouse gas measurement system (dynamic gas chamber method) during the periods of October–November 2018 and April–May 2019. The results showed that during the freezing period of near-surface soil, CO2 and CH4 fluxes significantly declined, approaching zero, at the end of November. During the thawing period of near-surface soil, CO2 and CH4 fluxes from surface soil fluctuated markedly at first and then rose rapidly. The respective Q10 values of 3.86 and 4.89 during the freezing and thawing periods of near-surface soil, respectively, indicate the important role of ground freeze–thaw cycles in the modifications of CO2 and CH4 fluxes. The results of this study could help assess the stability of the soil carbon pool and carbon flux strength in taiga-forested permafrost regions in the northern Da Xing’anling Mountains, Northeast China.
{"title":"CO2 and CH4 fluxes from forest soil in the northern Da Xing’anling Mountains in Northeast China during the freezing and thawing periods of near-surface soil in 2018–2019","authors":"Lin Yang, Qiuliang Zhang, H. Jin, Zhongtao Ma, Xiaoying Jin, S. S. Marchenko, R. He, V. Spektor, X. Chang","doi":"10.1080/02827581.2023.2208874","DOIUrl":"https://doi.org/10.1080/02827581.2023.2208874","url":null,"abstract":"ABSTRACT Under a warming climate, the studies on effects of seasonal freeze–thaw cycles on soil respiration are key to understanding the soil carbon cycles and ecosystem responses and resilience at mid- and high latitudes. In this study, the effluxes of soil surface CO2 and absorption rates of CH4 were measured in the Xing'an larch (Larix gmelinii) forest in the northern Da Xing’anling Mountains, Northeast China using an automatic multichannel soil greenhouse gas measurement system (dynamic gas chamber method) during the periods of October–November 2018 and April–May 2019. The results showed that during the freezing period of near-surface soil, CO2 and CH4 fluxes significantly declined, approaching zero, at the end of November. During the thawing period of near-surface soil, CO2 and CH4 fluxes from surface soil fluctuated markedly at first and then rose rapidly. The respective Q10 values of 3.86 and 4.89 during the freezing and thawing periods of near-surface soil, respectively, indicate the important role of ground freeze–thaw cycles in the modifications of CO2 and CH4 fluxes. The results of this study could help assess the stability of the soil carbon pool and carbon flux strength in taiga-forested permafrost regions in the northern Da Xing’anling Mountains, Northeast China.","PeriodicalId":21352,"journal":{"name":"Scandinavian Journal of Forest Research","volume":"38 1","pages":"275 - 285"},"PeriodicalIF":1.8,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44869620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-13DOI: 10.1080/02827581.2023.2211807
Marie-Claude Jutras-Perreault, E. Næsset, T. Gobakken, H. Ørka
ABSTRACT Deadwood is an important indicator of biodiversity in forest ecosystems. Identifying areas with large density of standing dead trees through field inventory is challenging, and remotely sensed data can provide a more systematic approach. In this study, we used metrics derived from airborne laser scanning (ALS) data (7.1 points m−2) and vegetation indices from optical images (HySpex sensor VNIR-1800: 0.3 m, SWIR-384: 0.7 m) to predict the presence of standing dead trees over a 15.9 km2 managed forest in Southern Norway. The dead basal area (DBA) of 40 sample plots was computed and used to classify the plots into presence/absence of standing dead trees. An area-based approach (ABA) using logistic regression was initially tested, but due to limited ground reference information, no statistically significant models could be formulated. A tree-based approach (TBA) was used to overcome this limitation. It identified trees on the ALS point cloud with a local maxima function and used a vegetation index to determine if the trees were dead. Between 18% and 42% of the predicted area with standing dead trees intersected a field recorded validation dataset. The TBA provided a good alternative to area-based regression models in the context of few standing dead trees.
枯木是森林生态系统生物多样性的重要指标。通过实地调查来确定枯死树密度大的地区是具有挑战性的，而遥感数据可以提供更系统的方法。在这项研究中，我们使用来自机载激光扫描(ALS)数据(7.1点m−2)和来自光学图像的植被指数(HySpex传感器VNIR-1800: 0.3 m, SWIR-384: 0.7 m)的指标来预测挪威南部15.9平方公里管理森林中存在的枯死树。计算了40个样地的死基面积(DBA)，并对样地进行了有无枯死树的分类。一种基于区域的方法(ABA)使用逻辑回归进行了初步测试，但由于有限的地面参考信息，没有统计显著的模型可以制定。一种基于树的方法(TBA)被用来克服这一限制。它通过局部最大值函数识别ALS点云上的树木，并使用植被指数来确定树木是否死亡。18%到42%的预测区域与现场记录的验证数据集相交。TBA提供了一个很好的替代基于区域的回归模型，在很少站立的死树的情况下。
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