Baltic Forestry最新文献

{"title":"Modeling depth of drainage ditches in forested peatlands in Finland","authors":"H. Hökkä, Leena Stenberg, A. Laurén","doi":"10.46490/bf453","DOIUrl":"https://doi.org/10.46490/bf453","url":null,"abstract":"Drainage ditches have been dug in peatlands and paludified forests in order to enhance forest growth in an area of 4.7 M ha in Finland. Because of peat subsidence, bank erosion, sedimentation, and ingrowth of vegetation ditches deteriorate with time. In this study the shallowing of ditch depth over time was investigated on the basis of country-wide peatland inventory data measured repeatedly up to four times. Mixed linear models were constructed separately for original ditches and maintained ditches (cleaned once or twice). After 20 years the ditches were 20-30 cm shallower than right after the digging. Time since digging was the most important variable explaining the shallowing for both original and maintained ditches. Other variables explaining the ditch shallowing were the digging method (excavator, plow), ditch bed slope, location, and peat layer thickness. The average development of maintained and original excavator ditches was very similar. The results can be used in assessing decision making concerning ditch cleaning.","PeriodicalId":55404,"journal":{"name":"Baltic Forestry","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2020-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45085489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Benefits of recreation in Poland on the example of the “Nad Tanwią” Nature Reserve","authors":"A. Mandziuk","doi":"10.46490/bf407","DOIUrl":"https://doi.org/10.46490/bf407","url":null,"abstract":"The quality of valuable natural areas is assessed through the prism of benefits derived from all the functions performed by them, among which tourist and recreational functions play an increasingly important role. The comparison of benefits and costs related to the provision of recreational services has an impact on the learning of tools used to assess tourist investments. The main purpose of the article was to determine financial benefits obtained by tourists visiting the „Nad Tanwią” Nature Reserve located in the south-eastern part of Poland, calculated using the travel cost method. The survey method was used as part of the research. Surveys were conducted from May to September 2017 on a group of 341 respondents. Data regarding the length of the visit and the amount of costs related to the stay in the Reserve were subjected to statistical analysis using the CART method. The results of the survey showed that the respondents reported a need for 14 types of visits depending on their duration. The value of the consumer surplus amounted to PLN 986/person, and the value of the gross benefit amounted to PLN 1,069/person. The value of the consumer surplus, which was the share of tourists visiting the Reserve during the year, amounted to PLN 108 million, and the gross value of non-market benefits for this group was PLN 118 million. Building a model of travel costs in the area of the Reserve allows for the assessment of recreational benefits of this place. The development of tourism and recreation in areas attractive in terms of nature contributes to improvement with regard to meeting recreational needs of tourists and the existing transportation infrastructure.","PeriodicalId":55404,"journal":{"name":"Baltic Forestry","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70546868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integration of statistical forest reflectance model and Sentinel-2 MSI images into a continuous forest inventory system","authors":"A. Kuusk, Mait Lang","doi":"10.46490/bf467","DOIUrl":"https://doi.org/10.46490/bf467","url":null,"abstract":"Spectral signatures of forest stands in Sentinel-2 MSI spectral bands are simulated with the statistical forest reflectance (SFRM) model and compared to the spectral signatures measured in spectral images at ten study sites in Estonia. As an overall measure of the agreement between simulated and measured spectral signatures we used the total error calculated as the sum of relative errors over spectral bands B2 to B11 of Sentinel-2. The distribution of the total error has strongly positive skewness at all study sites and all types of forests (broadleaf, pine and spruce forests). The right tail of the distribution is low. The stands of high value of the total error far right in the tail of the distribution may have some errors in their inventory data, or the inventory data are outdated. Pertinent stands should have priority in their in situ checking process. The SFRM model is a simple and reliable tool for the validity checking of forest inventory data, using routinely collected forest inventory data and operational satellite information of moderate spatial resolution. The model is simple and computationally efficient. Preparing input data for the model is a simple query in the forest inventory database. The suggested procedure can be incorporated into the automated systems of continuous forest inventory. \u0000  \u0000Keywords: Forest inventory, Sentinel-2 MSI images, Statistical forest reflectance model","PeriodicalId":55404,"journal":{"name":"Baltic Forestry","volume":" 45","pages":""},"PeriodicalIF":0.8,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41254178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ecogenetic plasticity and genetic variation in Populus hybrids under the impact of simulated climate change related stressors","authors":"Valda Gudynaitė-Franckevičienė, A. Pliūra, V. Suchockas","doi":"10.46490/bf462","DOIUrl":"https://doi.org/10.46490/bf462","url":null,"abstract":"To meet the needs of carbon sequestration and production of raw materials from renewable natural resources for the timber market of the European Union, it is necessary to expand forest plantation areas. The efficiency of short rotation forestry depends primarily on the selection of hybrids and clones, suitable for the local environmental conditions. We postulate that ecogenetic response, ecogenetic plasticity and genotypic variation of different hybrids of poplars (Populus L.) depend both on the type of stressors (spring frosts, summer drought, increased UV-B radiation, warm winters) and peculiarities of the cross-bred species as well as on their genetic preadaptations to native environmental conditions of their origin. The aim of the study was to estimate the ecogenetic plasticity, genotypic variation of adaptive traits and adaptability of Populus hybrids under simulated conditions of the expected climate change. \u0000The research was performed with the cultivars and experimental clones of three different intraspecific hybrids of poplars (P. nigra L., P. deltoides Bartr. ex Marsh, and P. trichocarpa Torr. & Gray.) and four interspecific hybrids of poplars (P. deltoides L. × P. nigra, P. deltoides × P. trichocarpa, P. maximowiczii A. Henry × P. trichocarpa, and P. balsamifera L. × P. trichocarpa). \u0000Simulated spring frosts and summer drought treatments had a substantial impact on growth of trees, but the hybrid and clone effects were also significant and showed that many hybrids and clones in general retain their features/differences under stressful environmental conditions. A strongly expressed hybrid and clone interactions with simulated frost and drought effects (genotype-environment interaction, G × E) showed different ecogenetic response, plasticity and specific ecological preferences of the clones and hybrids. The sensitivity of hybrids to UV-B radiation varied and depended on the origin of their parental trees and this sensitivity partially reflected their susceptibility also to other stressors. Warm winters adversely effected the growth of some hybrids while others - P. nigra × P. nigra and P. trichocarpa × P. trichocarpa, which parents originated from the southern part of their natural distribution range have increased their growth. This treatment also resulted in reduction of the heritability and genotypic variation of growth traits. \u0000  \u0000Keywords: poplars, clones, genotype-environment interaction, genetic variation, heritability","PeriodicalId":55404,"journal":{"name":"Baltic Forestry","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43643314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Asesment of the effect of beaver foraging activities on the alteration of waterside forests in northern and middle taiga of Russian Karelia","authors":"F. Fyodorov","doi":"10.46490/bf492","DOIUrl":"https://doi.org/10.46490/bf492","url":null,"abstract":"The territory of the Republic of Karelia is latitudinally elongated and traversing two boreal subzones such as the northern and middle taiga. Pine and spruce stands predominate in the northern taiga, while forests in middle taiga are more diverse, represented by secondary stands, and often dominated by deciduous species. These factors define the foraging behaviour of beavers and their role in alteration of riparian forests. Dispersing in the northern taiga, beavers tend to choose waterside areas with a higher proportion of deciduous species. However, such habitats occupy less than 1% of the forested area in this subzone, so the overall effect of beaver foraging on forest stands would be minor. On the other hand, inside beaver colonies, stand alteration is far more pronounced than changes in colonies in the middle taiga, and the effects are the following: 1) waterside forests in the northern taiga lose 2.5 times more deciduous trees than those in the middle taiga (61.4 and 26.3 %, respectively); 2) in waterside stands, aspen is totally removed, the share of conifers is doubled, and the share of birch is reduced (in the middle taiga, the share of birch around beaver colonies slightly increases, and the share of aspen is reduced by a factor of 1.5); 3) beavers in the north of Karelia consume thick birch trees more often than in the south of the region; 4) the regeneration capacity of damaged trees in the north is lower than in the south of Karelia. \u0000Key words: beavers, foraging activities, waterside forests, northern and middle taiga, tree stands","PeriodicalId":55404,"journal":{"name":"Baltic Forestry","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2020-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46428671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"White pine and Scots pine tree-ring chronologies as indicators of climate-related non-native and native tree growth patterns in Estonia","authors":"A. Läänelaid, S. Helama","doi":"10.46490/bf491","DOIUrl":"https://doi.org/10.46490/bf491","url":null,"abstract":"Three tree-ring chronologies of white pine (Pinus strobus), a species which are non-native to Europe, were constructed for Suuremoisa, Jadivere and Jarvselja sites in Estonia. These chronologies were related to instrumental climate records and Scots pine (P. sylvestris) chronologies from nearby sites. Growth rates of P. strobus exceeded those of P. sylvestris. The chronologies of the non-native and native pine species relatively well correlated with each other. Moreover, tree-ring growth of both species correlated positively with late-winter and spring (February–May) temperatures and negatively with spring (April) precipitation. While P. strobus growth was positively associated with summer precipitation, the growth of P. sylvestris remained positively related to the growing season temperatures. Both species exhibited a negative growth anomaly from 1939 to 1942. \u0000  \u0000Keywords: Pinus strobus, Pinus sylvestris, dendroclimatology, Estonia","PeriodicalId":55404,"journal":{"name":"Baltic Forestry","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2020-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42823741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ontogenetic structure of populations of forest-forming species of the Left-Bank Polissya of Ukraine","authors":"V. Skliar, K. Kyrylchuk, O. Tykhonova, L. Bondarieva, H. Zhatova, A. Klymenko, M. Bashtovyi, I. Zubtsova","doi":"10.46490/bf441","DOIUrl":"https://doi.org/10.46490/bf441","url":null,"abstract":"The results of study of the population ontogenetic structure of the main forest-forming species (Pinus sylvestris, Quercus robur, Acer platanoides, Betula pendula, Populus tremula) of the Left Bank Polissia of Ukraine are presented. The study covered plant communities, which are the most common and typical in the region. They are represented by four formations of forest vegetation, viz. Pineta sylvestris, Querceta roboris, Betuleta pendulae, Populeta tremulae, and belonged to 24 syntaxes in the rank of association groups and up to 42 syn-taxons in the rank of associations. The study was based on the use of geobotanical and population-ontogenetic approaches and methods. It was established that in the forests of the region, the most part of main forest-forming species populations have left-sided ontogenetic spectrum. Invasive populations are the predominant category. Only in the populations of the species involved in the formation of the second and especially the first tier of stands reveals the centred and bimodal spectra. In these species, the frequency of normal population occurrence increased, but their proportion was within 6.7–13.6%. No regressive populations were found in the main forest-forming species of the region. It was fixed that the ontogenetic spectra of the most of populations of the studied species were incomplete due to the absence of plants of some ontogenetic states. It was noted that the individual extinction of the young generation before they reached the generative ontogenetic state, was the clear evidence of significant disturbance in the region forests of the generation variability in forest-forming species. The limited representation of windfall microsite complexes in the composition of the forest plant communities of the Left-Bank Polissia of Ukraine as well as gaps enough in size to ensure successful undergrowth development and formation of a continuous flow of generations is one of the consequences of long-term man-made impact on these forests. \u0000Keywords: forest phytocoenosis, forest-forming tree species, population analysis, population structure, ontogenetic spectrum, Polissia of Ukraine","PeriodicalId":55404,"journal":{"name":"Baltic Forestry","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2020-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48550727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Honeydew producing insects in some forests of Turkey and their potential to produce of honeydew honey","authors":"S. Ülgentürk, Benjamin Cosic, I. Özdemir, A. Ipek, K. Sorkun","doi":"10.46490/bf397","DOIUrl":"https://doi.org/10.46490/bf397","url":null,"abstract":"The commercial interest in honeydew honey is increasing because of its higher therapeutic properties than most flower-based honeys. Marchalina hellenica Gennadius (Hemiptera: Marchalinidae) is one of the important scale insects to produce of honeydew honey and its honeydew in large quantities is collected by honeybees and used in pine honey in Turkey. The aim of this study was to survey and identify honeydew producing insects’ habitats that source of honeydew honey in pure fir forest in Bolu, spruce forests in Giresun (Black Sea region), oaks forest in Kirklareli (Thracian region) and cedar forest in Antalya (Mediterranean region). In accordance with these results, we found 20 honeydew producers and among of them are Cinara cedri Mimeur on Cedrus libani, Marchalina caucasica Hadzibejli on Abies nordmanniana subsp nordmanniana, and Picea orientalis; Nemolecanium abietis Borchsenius, Physokermes hellenicus Kozẚr & Gounari and Schizolachnus pineti on Abies bornmuelleriana; Lachnus roboris Linnaeus and Parthenolecanium rufulum (Cockerell) on Quercus spp. and Castanea sativa; Metcalfa pruinosa Say (Hemiptera: Flatidae) and Ricania simulans (Walker) (Hemiptera: Ricaniidae) on different host plants. All these insects produce large amount of honeydew depending on their population size. The article discusses the potential for these insects to produce honeydew honey. \u0000Keywords: Picea orientalis, Abies nordmanniana, Ricania simulans, Eulecanium sericeum Metcalfa pruinosa, Marchalina caucasica","PeriodicalId":55404,"journal":{"name":"Baltic Forestry","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2020-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47982572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diversity of old-drained forests in Estonia","authors":"J. Paal, Iti Jürjendal","doi":"10.46490/bf434","DOIUrl":"https://doi.org/10.46490/bf434","url":null,"abstract":"Due to originating from various mire or paludified forests and consequently developing after drainage under different growth conditions, the drained forests are very heterogeneous and complex. In the official Estonian forest typology, the old-drained stands are divided into Myrtillus and Oxalis site types, but recently the validity of the autonomous Dryopteris (expansa) forest site type was again asserted. The aims of the current study were to (i) elucidate the main factors determining the structure and variation of the Estonian old-drained forests, (ii) elaborate the typology of these forests at the community level and, (iii) establish the indicator species of the established community types. 218 forest stands drained not less than 35–40 years ago were analysed. According to multivariate data analyses (cluster, ordination and variance analyses, multi-response permutation procedures, indicator species analyses) it appeared that the soil reaction, nutrients, and moisture content, assessed by the Ellenberg ecological indicator values for habitats are much more significant factors for plant growth and community structure than the thickness of soil/peat horizons. Nevertheless, the litter and peat horizons in soils of drained Dryopteris site type forests is significantly thinner than in Oxalis and Myrtillus site type stands. The Dryopteris site type forests can be divided into six, the Oxalis site type forests into three, and the Myrtillus site type forests into two types of communities. Each of the 11 established community types differ significantly (p < 0.05) from each other and have their own dominant and significant indicator species. When comparing the Estonian old-drained forests with analogous stands in neighbouring countries (Latvia, Finland, Sweden, northwestern Russia) we can find rather large similarities; the typological differences result mainly from the methodological approaches and geographical scope of countries. \u0000Key words: community types, drainage impact, Dryopteris forest site type, fern-rich forests, indicator species, Ellenberg indicator values, nutrition gradient.","PeriodicalId":55404,"journal":{"name":"Baltic Forestry","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2020-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46715557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Patterns of invasion, biology and ecology of Erechtites hieraciifolia in the northern expansion range in Europe (C and NE Poland)","authors":"P. Zaniewski, D. Wołkowycki, A. Szczepkowski, A. Otręba, Ewa Zaniewska, Anna Kębłowska","doi":"10.46490/bf409","DOIUrl":"https://doi.org/10.46490/bf409","url":null,"abstract":"The complexity of invasion process of alien species is very high and requires better understanding. Nowadays, the successful range expansion of Erechtites hieraciifolia is being observed in Poland. In the study, the distribution of the species in Poland was summarized, based on the available literature and new field data. The fieldworks were conducted in the part of the species expansion zone located in central and north-eastern Poland. Two case studies on species encroachment into post-fire and transitional bog communities were performed and a case inventory of the species presence on the border of its main secondary range was conducted. The measurements of height, counting of the number of inflorescences per individual and the number of achenes per flower head were conducted in selected stands. There was performed a checking of local conditions of growth using ecological indicator values for vascular plants. The analyzed specimens of the species had significantly less inflorescences and achenes than in the other parts of the species expansion zone. They grew also in worse light conditions and in less fertile sites. The species colonized most disturbed patches at first. It spread to the less disturbed ones and omitted natural sites. The massive colonization of the transitional bog could be caused by groundwater level lowering. In the area of the edge of the species main range it was found in many diffuse stands within disturbed patches of the landscape. Based on the obtained results the species is considered to create now still only a moderate threat in the analyzed part of the expansion zone. The possibility of its expansion to wetland sites and sudden appearance in Kampinos National Park needs much more attention. \u0000Key words: alien invasive species, climate change, American burnweed, expansion, disturbance","PeriodicalId":55404,"journal":{"name":"Baltic Forestry","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2020-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49224592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}