scholarly journals Height to Crown Base Modelling for the Main Tree Species in an Even-Aged Pedunculate Oak Forest

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Saray Martín-García ◽  
Ivan Balenović ◽  
Luka Jurjević ◽  
Iñigo Lizarralde ◽  
Krunoslav Indir ◽  
...  
Keyword(s):  
Forest Fires ◽  
Mean Squared Error ◽  
Logistic Models ◽  
Alnus Glutinosa ◽  
Pedunculate Oak ◽  
Mixed Stands ◽  
Acer Campestre ◽  
Critical Measure ◽  
Fraxinus Angustifolia ◽  
Crown Base Height

The height to crown base (hcb) is a critical measure used in many investigations as an input variable to investigate the vigour of the stands, the social position of the trees, and to evaluate the behaviour of forest fires, among other uses. Though measuring height-related variables in the field is always time-consuming, the foremost benefits offered by modelling hcb are that it permits to generalize and average a very uneven attribute and, furthermore, provides insights about which tree and stand variables have a significant impact on hcb. However, there are many species in which models of the crown base height have not been developed in Croatia. The objective of this research was to develop a height to base crown model for each of the main species present in the two-layered mixed stands of this study. According to previous investigations, logistic models provide the highest precision and require the lowest inventory cost owing to less frequent measurements. Tree- and plot-level variables with distance-independent competition indexes were studied in the fitting model. In this research, we obtained models for the main stand species: Acer campestre (root mean squared error (RMSE) = 2.28 m, R2 = 82.80%); Alnus glutinosa (RMSE = 1.78 m, R2 = 85.36%); Carpinus betulus (RMSE = 2.47 m, R2 = 67.55%); Fraxinus angustifolia (RMSE = 2.46 m, R2 = 82.45%); Quercus robur (RMSE = 2.60 m, R2 = 80.57%); Tilia sp. (RMSE = 2.01 m, R 2 = 89.07%); and Ulmus laevis (RMSE = 1.71 m, R2 = 92.42%). The combination of the total height, tree, and plot-level variables with distance-independent competition indexes contributed to the prediction accuracy of proposed model significantly.

scholarly journals The Forest Vegetation of the Tolfa-Ceriti Mountains (Northern Latium - Central Italy)

Hacquetia ◽  
2010 ◽  
Vol 9 (1) ◽  
pp. 91-150 ◽  
Author(s):  
Romeo Pietro ◽  
Mattia Azzella ◽  
Laura Facioni
Keyword(s):  
Central Italy ◽  
Alnus Glutinosa ◽  
Quercus Petraea ◽  
Forest Vegetation ◽  
Oak Forests ◽  
Acer Campestre ◽  
Turkey Oak ◽  
Fraxinus Angustifolia ◽  
New Association ◽  
Woodland Communities

The Forest Vegetation of the Tolfa-Ceriti Mountains (Northern Latium - Central Italy)The forests of the Tolfa-Ceriti mountains (Latium, central Italy) were investigated through a phytosociological approach. 249 relevés were performed and treated with multivariate analysis. 13 woodland communities were identified, of which 7 belong toQuercetalia pubescenti-petraeae, 1 toFagetalia sylvaticae, 1 toPopuletaliaand 4 toQuercetalia ilicis. The thermophilous Turkey oak-forests occurring on the trachytic hills of the Ceriti Mountains and on the flysch substrates of the Tolfa Mountains were included inRubio peregrinae-Quercetum cerridisass. nova.Quercus cerrisandFraxinus angustifoliasubsp.oxycarpawoodland communities of the footslopes have been ascribed toFraxino oxycarpae-Quercetum cerridis, while the widespread mesophilus Turkey oak forests have been ascribed toMelico-Quercetum cerridis. Cephalantero longifoliae-Quercetum cerridishas been restricted to acid and oligotrophic soils.Quercus petraeawoodlands, occurring on trachytic substrates have been described as a new association namedCarici olbiensis-Quercetum petraeaeass. nova. All these mixed oak woods have been included in the allianceCrataego laevigatae-Quercion cerridisArrigoni 1997. The nomenclatural problems concerning the prior nameTeucrio siculi-Quercion cerridisUbaldi 1988 are also discussed. The beech forests of the higher altitudes have been included inFraxino orni-Fagetum sylvaticae, while theAlnus glutinosaravine woodlands have been described as belonging to the new associationPolysticho setiferi-Alnetum glutinosae. Secondary communities ofAcer monspessulanumandAcer campestredeveloped on flysch substrates, and ofErica arboreaandArbutus unedo(Erico-Arbutetum unedonis) developed on trachytic substrates, have also been identified. Finally two types ofQuercus ilexwood have been identified:Cyclamino repandi-Quercetum ilicis, on sandstones, and the new associationArbuto unedonis-Quercetum ilicisass. nova on volcanic soils. This latter community can be considered as a coenological and geographical vicariant in central Italy of the sicilianErico-Quercetum ilicis.

scholarly journals Locality 'Jozića Koliba' in Serbia: The forest community characteristics

2015 ◽  
pp. 93-101
Author(s):  
Milorad Veselinović ◽  
Suzana Mitrović ◽  
Snežana Stajić ◽  
Nevena Čule ◽  
Dragica Vilotić ◽  
...  
Keyword(s):  
Life Form ◽  
Forest Community ◽  
Pedunculate Oak ◽  
Community Characteristics ◽  
Acer Campestre ◽  
Oak Trees ◽  
Form Representation ◽  
Special Value ◽  
Reserve Forest ◽  
Fraxinus Angustifolia

The memorial complex "Jozića Koliba" is situated within the boundaries of Obrenovac Reserve forest complex. A special value of this locality is its group of protected pedunculate oak trees, which consists of six protected trees aged approximately 200 years with their crown projections. The idea to protect not only the trees themselves, but also their immediate surroundings of which the forest community forms a part, imposed the need for studying and describing the community. The study of current forest vegetation was performed according to the principle of French-Swiss school Braun-Blanquet, J (1921,1928). In total, 33 species were identified in the forest community. In the tree storey, three species were identified: Quercus robur L., Fraxinus Angustifolia Vahl. and Acer campestre L. In the herb layer, two legally protected species were identified: Ruscus aculeatus L. and Viola odorata L. The presence of nine different areal types, dominated by species of sub-central-European flora element, was established by means of a phytogeographic analysis. According to the results of the analysis of life-form representation, this community is of a phanerophyte-hemicryptophyte type, with an increased presence of geophytes.

scholarly journals Datos sobre la flora y vegetación de la cuenca del río Guadiamar (Sevilla-Huelva, España).

2002 ◽  
Vol 27 ◽  
pp. 189-228 ◽  
Author(s):  
Andrés V. Pérez Latorre ◽  
Patricia Navas ◽  
David Navas ◽  
Yolanda Gil ◽  
Baltasar Cabezudo
Keyword(s):  
River Basin ◽  
Alnus Glutinosa ◽  
Nerium Oleander ◽  
Populus Alba ◽  
Ulmus Minor ◽  
Guadiamar River ◽  
Sierra Morena ◽  
Fraxinus Angustifolia ◽  
Del Rio ◽  
Vegetation Series

RESUMEN. Datos sobre la flora y vegetación de la cuenca del río Guadiamar (Sevilla-Huelva, España). Sc ha realizado un estudio florístico, fitocenológico y fitogeográfico de la cuenca hidrográfica del río Guadiamar (Sevilla-Huelva, Andalucía, España). Bioclimáticamente domina en la cuenca el piso termomecliterráneo (con un reducto mesomediterráneo al NW) y el ombrotipo subhúmedo (seco al S). Se propone una sectorización fitogeográfica para la cuenca a un nivel inferior al de sector y resaltando el papel de conector de la cuenca del Guadiamar entre la provincia Luso-Extremadurense (Sierra Morena) y la Tingitano-Onubo-Algarviense (arenales y marismas). Como resultado sobre la flora, se presenta un conjunto de especies de interés por estar protegidas, por su escasez en la cuenca, en Andalucía Occidental, o por indicar determinados ecosistemas frágiles o singulares. Respecto a la vegetación, el territorio presenta una gran diversidad de asociaciones y comunidades (96), algunas de ellas son novedades sintaxonómicas: Imperato cylindricae-Scirpetum holoschoeni, Cisto salvifolii-Ulicetum australis lavanduletosum sampaianae, Malcomio trilobae-Hytnenocarpetum hamosi loeflingietosunz baeticae, Ornithopi isthmocarpi-Anthoxantetum ovati y vulpietosum alopecuroris, Ranunculo peltati-Callitrichetum brutiae y Ranunculo hederacei-Callitrichetum stagnalis. Además se lectotipifican Polypogono monspeliensis-Ranunculetum scelerati y Scolymo maculati-Sylibetum mariani. Se han catalogado 13 series de vegetación, 5 de tipo climatófilo, dominadas por fagáceas (Quercus suber y Quercus rotundtfolia) con faci aciones de Pious pinea, Olea europaea var. sylvestris o Quercus broteroi, y 8 de tipo edafohidrófi lo (caracterizadas respectivamente por Populus alba, Fraxinus angustifolia, Ulmus minor, Alnus glutinosa, Salix pedicellata, Nerium oleander, Tamariz gallica y Securinega tinctorea). Así mismo, aparecen complejos edafogénicos (mosaicos) de vegetación halófila en Entremuros (Parque Natural de Doñana) y de vegetación dulceacuícola por toda la cuenca. La vegetación permanente edafoxerófila corresponde a Genistetum polyanthi. Se presentan un esquema sintaxonómico, tablas fitosociológicas de novedades y un mapa de las series de vegetación.Palabras clave. Flora, vegetación, Fitogeografía, río Guadiamar, Sevilla, Huelva, Andalucía, España.SUMMARY. Flora and vegetation in the basin of the Guadiamar river (Seville-Huelva, Spain). We have carried out a floristical, phytocoenological and phytogeographical study about the Guadiamar river basin (Seville-Huelva, Andalusia, Spain). Thermo-mediterranean bioclimatic belt (appearing a little meso-mediterranean belt area towards NW) and sub humid ombro-type (dry towards S) characterises the basin. It is proposed a phytogeographical scheme under sector level for the Guadiamar basin. Stands out the corridor role of the Guadiamar river between the phytogeographical provinces Luso-Extremadurense (Sierra Morena) and Tingitano-Onubo- Algarviense (sandy lands and marshes). A group of species are highlighted as a result of being protected, rare in the basin or in Western Andalusia or because of living in fragile or singular ecosystems. Regarding the vegetation, a high diversity of plant communities has been found (96), some of them are new syntaxa or combinations: Impercaocylindricae-Scirpetumholoschoeni, Cisto salvifolii-Ulicetum australis lavanduletosum sampaianae, Malcomio trilobae- flymenocarpetum hamosi loeflingietosum baeticae, Ornithopi istlunocarpi-Anthoxantetum ovati and vulpietosutn alopecuroris, Ranunculo peltati-Callitrichetum brutiae, Ranunculo hederacei- Callitrichetum stagnalis. Two syntaxa are lectotypified here: Polypogono tnonspeliensis- Ranunculetum scelerati and Scolymo niaculati-Sylibetum mariani. 13 vegetation series have been recorded: 5 climactic, characterised by Quercus sober and Quercus rotundifolia showing variants with Pious pinea, Olea sylvestris or Quercus broteroi. 8 series are linked to riverside biotopes and respectively characterised by Populus alba, Fraxinus angustifolia, Ulmus minor, Alnus glutinosa, Salix pee/ice//ala, Nerium oleander, Tamarix gal lica and Securinega tinctorea. Halophytic vegetation (mosaics) is located in Entremuros near the Doilana marshes and also wetlands with hydrophilic vegetation are spread all over the basin. Soil-xeric permanent vegetation is represented by Genistetum polyanthi. A syntaxonomical scheme, phytosociological tables and one map of the vegetation series are also included.Key words. Flora, vegetation, Phytogeography, Guadiamar river basin, Seville, Huelva, Andalusia, Spain.

scholarly journals Species interactions under climate change in mixed stands of Scots pine and pedunculate oak

2021 ◽  
Vol 481 ◽  
pp. 118615
Author(s):  
M. Bouwman ◽  
D.I. Forrester ◽  
J. den Ouden ◽  
G.-J. Nabuurs ◽  
G.M.J. Mohren
Keyword(s):  
Climate Change ◽  
Scots Pine ◽  
Species Interactions ◽  
Pedunculate Oak ◽  
Mixed Stands

scholarly journals Prepoznavanje i kartiranje šumskih staništa Natura 2000 u Hrvatskoj (I) – 91E0*, aluvijalne šume s crnom johom Alnus glutinosa i običnim jasenom Fraxinus excelsior (Alno-Padion, Alnion incanae, Salicion albae)

2019 ◽  
Vol 143 (5-6) ◽  
pp. 264-264
Author(s):  
Ivana Plišo Vusić ◽  
Irena Šapić ◽  
Joso Vukelić
Keyword(s):  
Practical Importance ◽  
Habitat Type ◽  
Natura 2000 ◽  
Alnus Glutinosa ◽  
Pedunculate Oak ◽  
Floodplain Forests ◽  
Habitat Types ◽  
Black Alder ◽  
Habitat Classification

Habitat type 91E0 in Croatia extends to approximately 80,000 ha. It contains 16 types according to the National habitat classification of Croatia (NHC). They are based on phytosociological principles and are aligned with the level of association. They are: E.1. Riparian alluvial willow forests (Salicion albae Soó 1930), poplar (Populion albae Br.-Bl. 1931) and white alder forests (Alnion incanae Pawl. in Pawl. et al. 1928) Riparian alluvial willow and poplar forests (Salicion albae, Populion albae) E.1.1.1. – Salicetum albae-fragilis Soó (1930) 1958 E.1.1.2. – Salicetum albae Isller 1926 E.1.1.3. – Salici-Populetum nigrae (R. Tx. 1931) Meyer Drees 1936 E.1.2.1. – Populetum albae (Br.-Bl.) Tchou 1947 E.1.2.2. – Populetum nigro-albae Slavnić 1952 Alluvial white alder forests (Alnion incanae) E.1.3.1. – Equiseto hyemali-Alnetum incanae M. Moor 1958 E.1.3.2. – Lamio orvalae-Alnetum incanae Dakskobler 2010 E.2. Floodplain forests of pedunculate oak, black alder and narrow-leaved ash (Alnion glutinosae Malcuit 1929, Alnion incanae) Swamp and floodplain forests of black alder narrow-leaved ash (Alnion glutinosae) E.2.1.4. – Frangulo-Alnetum glutinosae Rauš (1971) 1973 E.2.1.6. – Carici elongatae-Alnetum glutinosae W. Koch 1926 ex Tx. 1931 E.2.1.7. – Leucojo-Fraxinetum angustifoliae Glavač 1959 E.2.1.9. – Carici acutiformis-Alnetum glutinosae Scamoni 1935 Alluvial and wetland forests of black alder, elms, narrow-leaved and common ash (Alnion incanae) E.2.1.1. – Fraxino angustifoliae-Ulmetum laevis Slavnić 1952 E.2.1.2. – Carici remotae-Fraxinetum excelsioris W. Koch 1926 ex Faber 1936 E.2.1.3. – Carici brizoidis-Alnetum glutinosae Horvat 1938 E.2.1.5. – Pruno-Fraxinetum angustifoliae Glavač 1960 E.2.1.8. – Stellario nemorum-Alnetum glutinosae Lohmayer 1957 The article contains a description, area of distribution in Croatia, and diagnostic indicators for each type. For each type related types are listed, the corresponding code according to EUNIS-classification, and literature in which is described in more detail. This article has practical importance because it helps in the identification and mapping of forest habitat types, and these tasks are currently being implemented in the Croatian forestry.

scholarly journals Modeling Diameter Distribution of Black Alder (Alnus glutinosa (L.) Gaertn.) Stands in Poland

Forests ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 412 ◽  
Author(s):  
Piotr Pogoda ◽  
Wojciech Ochał ◽  
Stanisław Orzeł
Keyword(s):  
Goodness Of Fit ◽  
Mean Squared Error ◽  
Alnus Glutinosa ◽  
Weibull Model ◽  
Diameter Distribution ◽  
Stand Age ◽  
Weibull Function ◽  
Black Alder ◽  
Kolmogorov Smirnov ◽  
Non Parametric

We present diameter distribution models for black alder (Alnus glutinosa (L.) Gaertn.) derived from diameter measurements made at breast height in 844 circular sample plots set in 163 managed stands located in south-eastern Poland. A total of 22,530 trees were measured. Stand age ranged from six to 89 years. The model formulation was based on the two-parameter Weibull function and a non-parametric percentile-based method. Weibull function parameters were recovered from the first raw and second central moments estimated using the stand quadratic mean diameter. The same stand characteristic was used to predict values of 12 percentiles in the percentile-based method. The model performance was assessed using the k-fold cross-validation method. The goodness-of-fit statistics include the Kolmogorov–Smirnov statistic, mean error, root mean squared error, and two variants of the error index introduced by Reynolds. The percentile model developed, accurately predicted diameter distributions in 88.4% of black alder stands, as compared to 81.9% for the Weibull model (Kolmogorov–Smirnov test). Alternative statistical metrics assessing goodness-of-fit to empirical distributions suggested that the non-parametric percentile model was superior to the parametric Weibull model, especially in stands older than 20 years. In younger stands, the two models were accurate only in 57% of the cases, and did not differ significantly with respect to goodness-of-fit measures.

scholarly journals Mathematical models to describe the growth curves of white-egg layers

2018 ◽  
Vol 39 (3) ◽  
pp. 1327
Author(s):  
Cleber Franklin Santos de Oliveira ◽  
João Marcos Novais Tavares ◽  
Gerusa Da Silva Salles Corrêa ◽  
Bruno Serpa Vieira ◽  
Silvana Alves Pedrozo Vitalino Barbosa ◽  
...  
Keyword(s):  
Mathematical Models ◽  
Mean Squared Error ◽  
Computer Software ◽  
Logistic Models ◽  
Growth Curves ◽  
Gompertz Model ◽  
Information Criterion ◽  
Coefficient Of Determination ◽  
Population Densities

The aim of this study was to compare mathematical models describing growth curves of white-egg layers at different population densities. To fit the models, 4,000 growing white-egg layers were utilized. The experimental design was completely randomized, with population densities of 71, 68, 65, 62, and 59 birds per cage in the starter phase and 19, 17, 15, 13, and 11 birds per cage in the grower phase, with 10 replicates each. Birds were weighed weekly to determine the average body weight and the weight gain. Gompertz and Logistic models were utilized to estimate their growth. The data analysis was carried out using the PROC NLMIXED procedure of the SAS® statistical computer software to estimate the parameters of the equation because mixed models were employed. The mean squared error, the coefficient of determination, and Akaike’s information criterion were used to evaluate the quality of fit of the models. The studied models converged for the description of the growth of the birds at the different densities studied, showing that they were appropriate for estimating the growth of white-egg layers housed at different population densities. The Gompertz model showed a better fit than the Logistic model.

scholarly journals The Accuracy of Standwise Forest Inventory in Mature Stands

2014 ◽  
Vol 32 (1) ◽  
pp. 2-8
Author(s):  
Ainārs Grīnvalds
Keyword(s):  
Forest Inventory ◽  
Alnus Glutinosa ◽  
Volume Estimation ◽  
Individual Species ◽  
Mixed Stands ◽  
Black Alder ◽  
Growing Stock ◽  
Study Results ◽  
Stock Volume ◽  
Mature Stands

Abstract Traditionally forest resources are estimated in each compartment or stand with ocular standwise forest inventory. However, this inventory technique has shortages with measurement accuracy. In the study the accuracy of the standwise forest inventory was estimated by comparing the growing stock volume of the standwise inventory with the accurate (instrumental) re-measurements. Comparison was done with 4515 mature stands of pine (Pinus sylvestris L.), spruce (Picea abies (L.) Karst.), birch (Betula spp.), aspen (Populus tremula L.) and black alder (Alnus glutinosa L.). The stands’ measurements by callipers or by harvesters (recalculated to growing stock volume) were used for accurate re-measurements. The study results show that the volume of standwise forest inventory have relative bias of 17.6% (volume is underestimated by 17.6%) and relative root mean square error 27.5 % for the whole data. Spruce stands are more accurately measured and black alder stands - inaccurately. The accuracy of pine, birch and mixed stands was similar to overall trends. Stands with volume 200 - 300 m3 ha-1 are more accurately measured and stands with the volume less than 200 m3 ha-1 - most inaccurately. The accuracy of stands with the volume more than 300 m3 ha-1, decreases by increasing the volume of stands. The volume estimation of individual species has different trends in standwise forest inventory. The volume of pine and birch is overestimated and the volume of spruce, aspen and black alder is underestimated.

scholarly journals Validation of a stability model for riparian forest trees: examples using pedunculate oak Quercus robur L., Scots pine Pinus sylvestris L. and black alder Alnus glutinosa (L.) Gaertn

2012 ◽  
Vol 73 (2) ◽  
pp. 137-141
Author(s):  
Tomasz Kałuża
Keyword(s):  
Pinus Sylvestris ◽  
Scots Pine ◽  
Quercus Robur ◽  
Riparian Forest ◽  
Alnus Glutinosa ◽  
Pedunculate Oak ◽  
Forest Trees ◽  
Black Alder ◽  
Stability Model

Weryfikacja modelu stateczności drzew na terenach zalewowych na przykładzie dębu Quercus robur L., sosny Pinus sylvestris L. i olchy Alnus glutinosa (L.) Gaertn

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