Forestry Studies最新文献_第4页

Puhtpuistute hinna- ja kasumiküpsuse empiiriline analüüs Eesti majandusmetsades ning selle võrdlus uuendusraiet lubava vanusega

Forestry Studies Pub Date : 2021-12-01 DOI: 10.2478/fsmu-2021-0021

Enn Pärt, Paavo Kaimre

{"title":"Puhtpuistute hinna- ja kasumiküpsuse empiiriline analüüs Eesti majandusmetsades ning selle võrdlus uuendusraiet lubava vanusega","authors":"Enn Pärt, Paavo Kaimre","doi":"10.2478/fsmu-2021-0021","DOIUrl":"https://doi.org/10.2478/fsmu-2021-0021","url":null,"abstract":"Abstract The article provides an overview of the results of the maturity age calculations for economically important tree species’ stands in Estonian commercial forests. The maturity by price is determined by a stand’s stumpage value per year of rotation. The maturity by net income (forest rent) is determined by the average annual net income of forest management, which is calculated based on the timber sales revenue, forest management costs and rotation period. The annual land tax and administrative costs have been included in the calculations, as well. The calculated maturity ages are compared with the required rotation ages stated in the Rules of Forest Management. According to the calculations, the maturity age by net income for pine stands in Ia and I site classes is 10…20 years lower than the current rotation age for regeneration felling. The maturity ages for spruce stands coincide with the current rotation ages. The calculated maturity ages by net income for aspen are about ten years higher than the current rotation ages. A comparison of the calculated maturity ages with the current rotation ages shows that these are rather similar.","PeriodicalId":35353,"journal":{"name":"Forestry Studies","volume":"40 1","pages":"202 - 219"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74398557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of interaction between Fusarium solani and Rhizoctonia solani on damping-off and root rot disease of Tetraclinis articulata seedlings 茄枯菌与茄根丝核菌互作对四环木幼苗枯萎和根腐病的影响

Forestry Studies Pub Date : 2021-12-01 DOI: 10.2478/fsmu-2021-0018

Rachid El Haddadi, A. Errifi, S. Msairi, A. Touhami, A. Douira

引用次数: 0

Optimizing the pine wood drying process using a critical diffusion coefficient and a timed moistening impulse 利用临界扩散系数和定时湿润脉冲对松木干燥过程进行优化

Forestry Studies Pub Date : 2021-12-01 DOI: 10.2478/fsmu-2021-0017

H. Tamme, P. Muiste, V. Tamme

{"title":"Optimizing the pine wood drying process using a critical diffusion coefficient and a timed moistening impulse","authors":"H. Tamme, P. Muiste, V. Tamme","doi":"10.2478/fsmu-2021-0017","DOIUrl":"https://doi.org/10.2478/fsmu-2021-0017","url":null,"abstract":"Abstract This article demonstrates that it is possible to optimize the drying process for pine wood in two independent ways. Those ways involve either the use of the critical diffusion coefficient (DC) which is determined by the experiment shown below, and/or the drying air moistening impulse in the second drying phase. When processing data which has been gained from the pine wood drying experiment, both coincidences and differences were found when compared to the results from a simulation of the drying process which was carried out using the same drying schedule. There is a relatively good level of agreement between the drying experiment and the simulation results of TORKSIM v5.11 simulation program in the case of the simulated and experimentally determined drying curves. The magnitude of numerical values for the DC agrees with this finding, as do the wood's moisture profile in the final phase of the drying experiment at 142 hours, the simulated and measured wood surface temperatures from the beginning of drying to a point at 60 hours into the process, and the simulated wood stresses when compared with the maximum values for the electrical surface-core ratio (ESCR) graph, as determined by the experiment. It was found that the DC's numerical value decreases sharply by about 1.5 times after transitioning from the first drying phase to the second drying phase.","PeriodicalId":35353,"journal":{"name":"Forestry Studies","volume":"125 10 1","pages":"150 - 165"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84183157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Composition of live, dead and downed trees in Järvselja old-growth forest Järvselja原生林中活的、死的和倒下的树的组成

Forestry Studies Pub Date : 2021-12-01 DOI: 10.2478/fsmu-2021-0009

A. Kangur, Kristi Nigul, A. Padari, A. Kiviste, H. Korjus, D. Laarmann, Eneli Põldveer, R. Mitt, L. Frelich, K. Jõgiste, John A. Stanturf, T. Paluots, Vivika Kängsepp, H. Jürgenson, S. Noe, A. Sims, Marek Metslaid

{"title":"Composition of live, dead and downed trees in Järvselja old-growth forest","authors":"A. Kangur, Kristi Nigul, A. Padari, A. Kiviste, H. Korjus, D. Laarmann, Eneli Põldveer, R. Mitt, L. Frelich, K. Jõgiste, John A. Stanturf, T. Paluots, Vivika Kängsepp, H. Jürgenson, S. Noe, A. Sims, Marek Metslaid","doi":"10.2478/fsmu-2021-0009","DOIUrl":"https://doi.org/10.2478/fsmu-2021-0009","url":null,"abstract":"Abstract The study area is in the Järvselja Training and Experimental Forest Centre, Estonia. The conservation of Järvselja old-growth forest started in 1924 when the area was excluded from all management activities and left to natural development. The aim of this study is to analyse the methods for calculating single tree height, tree stem lateral surface area, tree volume and carbon content for standing live trees, standing dead trees and for downed deadwood in old-growth forests. The study used the data of 6205 live trees, 1119 snags, 270 standing dead trees and 2983 deadwood trunks from the measured area. The most abundant tree species in Järvselja old-growth forest were Norway spruce and linden. During the last hundred years, the number of dominating tree species has increased slightly. The standing volume of birch, common aspen and Scots pine have been declining while for linden and black alder it has been increasing. In the comparison of tree height curves, the best results were obtained with the Näslund function, however, the Chapman-Richards function with fitting showed slightly better results for two tree species.","PeriodicalId":35353,"journal":{"name":"Forestry Studies","volume":"27 1","pages":"15 - 40"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83415206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Remote-sensing support for the Estonian National Forest Inventory, facilitating the construction of maps for forest height, standing-wood volume, and tree species composition 为爱沙尼亚国家森林清查提供遥感支助，促进编制森林高度、立木量和树种组成地图

Forestry Studies Pub Date : 2020-12-01 DOI: 10.2478/fsmu-2020-0016

Mait Lang, A. Sims, K. Pärna, R. Kangro, M. Möls, Marta Mõistus, A. Kiviste, Mati Tee, Toivo Vajakas, Mattias Rennel

引用次数: 3

Decline of Fraxinus excelsior L. in parks of Saint Petersburg: Who is to blame – Hymenoscyphus fraxineus or Diplodia spp.? 圣彼得堡公园黄曲霉数量的减少:是谁的错——黄膜隐虫还是双头虫?

Forestry Studies Pub Date : 2020-12-01 DOI: 10.2478/fsmu-2020-0013

D. Shabunin, A. Selikhovkin, E. Y. Varentsova, D. Musolin

{"title":"Decline of Fraxinus excelsior L. in parks of Saint Petersburg: Who is to blame – Hymenoscyphus fraxineus or Diplodia spp.?","authors":"D. Shabunin, A. Selikhovkin, E. Y. Varentsova, D. Musolin","doi":"10.2478/fsmu-2020-0013","DOIUrl":"https://doi.org/10.2478/fsmu-2020-0013","url":null,"abstract":"Abstract The weakening and decline of European ash Fraxinus excelsior L. and other ash species have been recorded at different locations in the suburbs of Saint Petersburg, Russia. During the summer of 2019 and spring of 2020, samples from leaves, petioles, and shoots were collected from the weakened and declining ash trees in three parks in Pushkin and Gatchina and maintained in humid chambers to induce the fructification of fungi. In total, 30 taxa of micromycetes belonging to 23 genera were identified using methods of light microscopy. Hymenoscyphus fraxineus, a putative agent of ash dieback, was not recorded in the samples collected in the crowns of trees, but only on the petioles of the fallen leaves in spring. Out of all the micromycetes recorded, only coelomycetes from the genus Diplodia Fr. (in particular, D. mutila) can damage the branches of ash trees and, thus, be considered pathogenic. It is likely that H. fraxineus opens “the entry of infection” and Diplodia spp. cause the major weakening and decline of branches. The data obtained can significantly change our understanding of the causes of ash dieback and possible methods of ash stand preservation. The reason for the low pathogenicity and activity of H. fraxineus, as well as the possible role of ascomycetes Diplodia spp. in the dieback of ash stands requires further research.","PeriodicalId":35353,"journal":{"name":"Forestry Studies","volume":"70 1","pages":"43 - 51"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86219064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Harvendusraietel toimunud metsaõigusnormide rikkumise juhtumite hindamine

Forestry Studies Pub Date : 2020-12-01 DOI: 10.2478/fsmu-2020-0021

Henn Korjus, Mihkel Mets, Ahto Kangur

引用次数: 0

Potential of ecological modelling and smart-drainage development for mitigating adverse effects of future global change-type droughts for the Estonian forest sector 生态模拟和智能排水发展对减轻未来全球变化型干旱对爱沙尼亚森林部门的不利影响的潜力

Forestry Studies Pub Date : 2020-12-01 DOI: 10.2478/fsmu-2020-0017

Jan-Peter George, Mait Lang, M. Hordo, Sandra Metslaid, P. Post, T. Tamm

{"title":"Potential of ecological modelling and smart-drainage development for mitigating adverse effects of future global change-type droughts for the Estonian forest sector","authors":"Jan-Peter George, Mait Lang, M. Hordo, Sandra Metslaid, P. Post, T. Tamm","doi":"10.2478/fsmu-2020-0017","DOIUrl":"https://doi.org/10.2478/fsmu-2020-0017","url":null,"abstract":"Abstract Global change-type droughts will become more frequent in the future and threaten forest ecosystems around the globe. A large proportion of the Estonian forest sector is currently subject to artificial drainage, which could probably lead to negative feedbacks when water supply falls short because of high temperatures and low precipitation during future drought periods. In this short article, we propose a novel research perspective that could make use of already gathered data resources, such as remote sensing, climate data, tree-ring research, soil information and hydrological modelling. We conclude that, when applied in concert, such an assembled dataset has the potential to contribute to mitigation of negative climate change consequences for the Estonian forest sector. In particular, smart-drainage systems are currently a rare phenomenon in forestry, although their implementation into existing drainage systems could help maintain the critical soil water content during periods of drought, while properly fulfilling their main task of removing excess water during wet phases. We discuss this new research perspective in light of the current frame conditions of the Estonian forest sector and resolve some current lacks in knowledge and data resources which could help improve the concept in the future.","PeriodicalId":35353,"journal":{"name":"Forestry Studies","volume":"66 1","pages":"98 - 106"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73624768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An indirect approach to predict deadwood biomass in forests of Ukrainian Polissya using Landsat images and terrestrial data 利用陆地卫星图像和陆地数据间接预测乌克兰波利西亚森林枯木生物量的方法

Forestry Studies Pub Date : 2020-12-01 DOI: 10.2478/fsmu-2020-0018

M. Matsala, V. Myroniuk, A. Bilous, A. Terentiev, P. Diachuk, R. Zadorozhniuk

{"title":"An indirect approach to predict deadwood biomass in forests of Ukrainian Polissya using Landsat images and terrestrial data","authors":"M. Matsala, V. Myroniuk, A. Bilous, A. Terentiev, P. Diachuk, R. Zadorozhniuk","doi":"10.2478/fsmu-2020-0018","DOIUrl":"https://doi.org/10.2478/fsmu-2020-0018","url":null,"abstract":"Abstract Spatially explicit and consistent mapping of forest biomass is one of the key tasks towards full and appropriate accounting of carbon budgets and productivity potentials at different scales. Landsat imagery coupled with terrestrial-based data and processed using modern machine learning techniques is a suitable data source for mapping of forest components such as deadwood. Using relationships between deadwood biomass and growing stock volume, here we indirectly map this ecosystem compartment within the study area in northern Ukraine. Several machine learning techniques were applied: Random Forest (RF) for the land cover and tree species classification task, k-Nearest Neighbours (k-NN) and Gradient Boosting Machines (GBM) for the deadwood imputation purpose. Land cover (81.9%) and tree species classification (78.9%) were performed with a relatively high level of overall accuracy. Outputs of deadwood biomass mapping using k-NN and GBM matched quite well (8.4 ± 2.3 t·ha−1 (17% of the mean) vs. 8.1 ± 1.7 t·ha−1 (16% of the mean), respectively mean ± SD deadwood biomass stock), indicating a strong potential of ensemble boosters to predict forest biomass in a spatially explicit manner. The main challenges met in the study were related to the limitations of available ground-based data, thus showing the need for national statistical inventory implications in Ukraine.","PeriodicalId":35353,"journal":{"name":"Forestry Studies","volume":"50 1","pages":"107 - 124"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79106129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Forest cover dynamics of the Bazoy Siberian pine (Pinus sibirica Du Tour) forest from 1915 to 2015 1915 - 2015年巴佐伊西伯利亚松林森林覆盖动态

Forestry Studies Pub Date : 2020-12-01 DOI: 10.2478/fsmu-2020-0014

N. Debkov, V. Sidorenkov, E. Sidorenkova, V. Sedykh

{"title":"Forest cover dynamics of the Bazoy Siberian pine (Pinus sibirica Du Tour) forest from 1915 to 2015","authors":"N. Debkov, V. Sidorenkov, E. Sidorenkova, V. Sedykh","doi":"10.2478/fsmu-2020-0014","DOIUrl":"https://doi.org/10.2478/fsmu-2020-0014","url":null,"abstract":"Abstract The article considers the long-term (100 years) dynamics of the forest cover of the southernmost unit of Siberian pine forests on the West Siberian plain. A key feature of forest management is that Siberian pine seeds are a valuable food product and, when cutting forests, this tree species, as a rule, is preserved. The basis of the experimental data was the material of the national forest inventories of 1915, 1974 and 2015 for a total area of 1,420.41 ha. During the period from 1915 to 2015, the forested area changed slightly (96.2 and 94.0%), while the share of Siberian pine stands increased significantly from 48.4 to 58.7%. Grassy Siberian pine forests (32.1%) of optimal age (120–140 years), which are characterised by the best seed productivity and the largest share of Siberian pine in the community (77%), predominate. Basically, human economic activity results in an increase in the area of Siberian pine stands, when deciduous stands with Siberian pine undergrowth are used for fuel and as building material. A decrease in the area of Siberian pine forests occurs mainly under the impact of fires. In the conflagrations of 1915–1920, 7 to 38% of silver birch forests have no Siberian pine undergrowth and are considered long-term secondary communities. In the remaining area, the proportion of Siberian pine undergrowth is 20–30% with a density of 800–1200 seedlings ha−1, which is sufficient for the natural formation of Siberian pine forests.","PeriodicalId":35353,"journal":{"name":"Forestry Studies","volume":"1 1","pages":"52 - 63"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90630028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0