stem form
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2022 ◽  
Vol 507 ◽  
pp. 119973
Author(s):  
Ruiting Liang ◽  
Yujun Sun ◽  
Lai Zhou ◽  
Yifu Wang ◽  
Siyu Qiu ◽  
...  

Author(s):  
Edwin Lauer ◽  
James Holland ◽  
Fikret Isik

Abstract Genomic prediction has the potential to significantly increase the rate of genetic gain in tree breeding programs. In this study, a clonally replicated population (n = 2063) was used to train a genomic prediction model. The model was validated both within the training population and in a separate population (n = 451). The prediction abilities from random (20% vs. 80%) cross validation within the training population were 0.56 and 0.78 for height and stem form, respectively. Removal of all full-sib relatives within the training population resulted in ∼50% reduction in their genomic prediction ability for both traits. The average prediction ability for all 451 individual trees was 0.29 for height and 0.57 for stem form. The degree of genetic linkage (full sib family, half sib family, unrelated) between the training and validation sets had a strong impact on prediction ability for stem form but not for height. A dominant dwarfing allele, the first to be reported in a conifer species, was discovered via GWAS on linkage group 5 that conferred a 0.33 m mean height reduction. However, the QTL was family specific. The rapid decay of LD, large genome size, and inconsistencies in marker-QTL linkage phase suggest that large, diverse training populations are needed for genomic selection in Pinus taeda L.


2021 ◽  
Vol 914 (1) ◽  
pp. 012008
Author(s):  
S Sunarti ◽  
A Milaba ◽  
D T Adriyanti ◽  
A Nirsatmanto

Abstract Acacia hybrid is an interspecific hybrid resulting from crossing between Acacia mangium and A. auriculiformis either naturally or artificially. This study aimed to determine the morphological variation of artificial Acacia hybrid, obtained by full-diallel control crossing. Observed sample trees were clones at the clonal test, established in 2011 in Wonogiri, Central Java. Tree samples were taken by selecting clones categorized into the superior, intermediate, and inferior clones based on their growth at one year of age, with three different clones in each category. Parameters to be observed were morphological characters including quantitative (tree height, diameter breast height, bole length, phyllode length and phyllode width) and qualitative (stem form, stem straightness, bark type, bark color, phyllode shape, phyllode apex shape, conspicuousness of the main vein, and petiole color). The data quantitative and qualitative were then scored and analyzed using NCSS series 12 software for cluster analysis. The results showed that morphological characters of Acacia hybrid clones varied across the tree categories. Furthermore, the dendrogram showed that the characters of Acacia hybrid grouped into two clusters: Cluster A dominated by superior and most intermediate clones, and Cluster B dominated by inferior clones. The study result implies the use of morphological characters of Acacia hybrid to select the hybrid vigor in a breeding program.


2021 ◽  
Vol 13 (21) ◽  
pp. 4265
Author(s):  
Cesar Alvites ◽  
Giovanni Santopuoli ◽  
Markus Hollaus ◽  
Norbert Pfeifer ◽  
Mauro Maesano ◽  
...  

Timber assortments are some of the most important goods provided by forests worldwide. To quantify the amount and type of timber assortment is strongly important for socio-economic purposes, but also for accurate assessment of the carbon stored in the forest ecosystems, regardless of their main function. Terrestrial laser scanning (TLS) became a promising tool for timber assortment assessment compared to the traditional surveys, allowing reconstructing the tree architecture directly and rapidly. This study aims to introduce an approach for timber assortment assessment using TLS data in a mixed and multi-layered Mediterranean forest. It consists of five steps: (1) pre-processing, (2) timber-leaf discrimination, (3) stem detection, (4) stem reconstruction, and (5) timber assortment assessment. We assume that stem form drives the stem reconstruction, and therefore, it influences the timber assortment assessment. Results reveal that the timber-leaf discrimination accuracy is 0.98 through the Random Forests algorithm. The overall detection rate for all trees is 84.4%, and all trees with a diameter at breast height larger than 0.30 m are correctly identified. Results highlight that the main factors hindering stem reconstruction are the presence of defects outside the trunk, trees poorly covered by points, and the stem form. We expect that the proposed approach is a starting point for valorising the timber resources from unmanaged/managed forests, e.g., abandoned forests. Further studies to calibrate its performance under different forest stand conditions are furtherly required.


2021 ◽  
pp. 216-247
Author(s):  
Osamu Sawada ◽  
Jun Sawada

This chapter investigates the interpretation of tense in Japanese mirative sentences using nante/towa and considers cross-linguistic variations of mirativity in terms of tense. In Japanese, when nante or towa is combined with a proposition that contains the so-called non-past form ru, the sentence becomes ambiguous as having both a non-past (future/present) reading and a past reading. Based on a theory by Sawada and Sawada (2019), we argue that this ambiguity of tense is due to the conventional implicature of nante/towa: nante/towa can take a ‘non-tensed’ proposition p and conventionally implies that (i) p is settled (i.e., p is/was true or predicted to be true) and (ii) the speaker did not expect such p. It will be shown that a basic analysis of nante/towa can apply to the English exclamatory that-clause, which also presents an ambiguity of tense, and at least partially to the Korean mirative tani sentence in which a past-oriented meaning can be represented based on the stem form of a verb.


2021 ◽  
Vol 12 (2) ◽  
pp. 401-406
Author(s):  
Penka Borisova ◽  

The dynamics of our time requires a change in the educational paradigm and in particular – the techniques and technologies of teaching in preschool education. With the development of information and communication technologies, there is a need to implement them in kindergarten. Innovative models in the learning process aim to support the formation and development of children’s cognitive abilities in a way that is interesting to them, through the use of modern technologies. The new needs of children require flexibility in teaching, which is different from the traditional methodology and conservative models of learning. This paper presents a theoretical and applied study of the STEM approach and derivation of interactive STEM forms and technologies for teaching Mathematics in a preparatory group of kindergarten: clarifies its nature and practical implementation in modeling STEM -educational technology – a model of a studio for adolescents in the preschool stage and its benefits.


Author(s):  
Nunu Geldiashvili

Literary Works byAkaki Tsereteli are considered as versatile and diverse. In his works he touches upon almost everything by his poetry, prose, journalism or public work. It is obvious that he established "a type of versatile writer who is equally engaged in prose, poetry, journalism, dramaturgy, translations, children's literature and fables”. He was an extremely optimistic person who deeply believed in the future. The following words from one of his works seem amazingly and expressive: “Even if you kill a swallow, Spring will definitely come”. Connection between the old and the new forms, that is clearly shown within this emotionally colored expression, has become the goal of the research. We tried to find an answer to the question- what is the role of using old Georgian forms in Akaki's work?! Given paper analyses the samples such as: 1. Using proper name by its stem form in nominative case; 2. Ending words by - მან [-man] in the ergative form; 3. Full stems of demonstrative pronouns - ‘ამ’ [am] , ‘ეგ’ [eg] (=this, that); 4. Using postposition – ‘ზე’ [ze] (=on), along with the forms - ზედ [-zed] and -ზედა [-zeda] (=on, over); 5. instrumental case forms formed by a suffix - ით [-it] (=with) (without postpositions); 6. Postposition and full agreement of attribute and antecedent 7. Characteristics of using inflection as a reflection of Old Georgian (გწყალობდესთ [gtskalobdet]...; გამოვჰკითხავ [gamovhkitkhav]...; ჰსვამ [hvsvam]...; ჰნიშნავს [hnishnavs]...; წარმოსთქვა [tsarmostkva]...; გასტეხე [gastekhe]...); 8. Using conjunction - ვით [vit] (=as/like) for comparison and so on. If we ask questions concerning the function of old Georgian forms in Akaki Tsereteli’s works, it becomes clear that they can be used for: 1. rhythm, emotiveness and expressiveness; 2. Preserving traditional forms, to maintain the connection between old and new Georgian. It should be mentioned that similar forms are equally reflected in Akaki’s prose and poetry which further reinforces the idea in favor of showing the connection between the old and the new and the desire to maintain this connection and always remember where we come from and who we are ... .This fact does not completely contradict the idea that Akaki is a representative of the generation that courageously rejected the old linguistic norms and contributed to the democratization (rapprochement process with the spoken language) of the literary language.


2021 ◽  
Vol 67 (No. 7) ◽  
pp. 318-327
Author(s):  
Andrii Bilous ◽  
Viktor Myroniuk ◽  
Viktor Svynchuk ◽  
Oleksandr Soshenskyi ◽  
Oleksandr Lesnik ◽  
...  

In January 2019 the forest industry in Ukraine adopted European standards for measuring and grading of round wood based on mid-point diameters, which caused major discrepancies from traditionally used estimates of timber volume using top diameters. To compare methods of merchantable wood volume estimation, we investigated the stem form inside bark for two dominant tree species in Ukraine, i.e. Scots pine (Pinus sylvestris L.) and common oak (Quercus robur L.). We used tree stem measurements to fit stem profile equations, whereas simulation was applied to derive log taper. We found that Newnham's (1992) variable-exponent taper equation performed well for predicting stem taper for both tree species. Then, we simulated the structure of harvested wood, so that it replicated annual distribution of logs by their length and diameters. As a result, the average log taper was estimated at 0.836 ÷ 0.855 cm·m<sup>–1</sup> and 1.180 ÷ 0.121 cm·m<sup>–1</sup> for pine and oak, respectively. The study also indicated that log taper varied along stems. The higher rates of diameter decrease were found for butt logs, for which the taper was 2.5–3.5 times higher than its average for the whole stem. The results of our study ensure the stacked round wood volume conversion between estimates obtained using top and mid-point diameters.


Forests ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 835
Author(s):  
Ville Luoma ◽  
Tuomas Yrttimaa ◽  
Ville Kankare ◽  
Ninni Saarinen ◽  
Jiri Pyörälä ◽  
...  

Tree growth is a multidimensional process that is affected by several factors. There is a continuous demand for improved information on tree growth and the ecological traits controlling it. This study aims at providing new approaches to improve ecological understanding of tree growth by the means of terrestrial laser scanning (TLS). Changes in tree stem form and stem volume allocation were investigated during a five-year monitoring period. In total, a selection of attributes from 736 trees from 37 sample plots representing different forest structures were extracted from taper curves derived from two-date TLS point clouds. The results of this study showed the capability of point cloud-based methods in detecting changes in the stem form and volume allocation. In addition, the results showed a significant difference between different forest structures in how relative stem volume and logwood volume increased during the monitoring period. Along with contributing to providing more accurate information for monitoring purposes in general, the findings of this study showed the ability and many possibilities of point cloud-based method to characterize changes in living organisms in particular, which further promote the feasibility of using point clouds as an observation method also in ecological studies.


Author(s):  
Katharina Burkardt ◽  
Christian Ammer ◽  
Dominik Seidel ◽  
Torsten Vor

Northern red oak wood is valuable for a variety of applications not only in its natural distribution range in North America, but also in Europe. Timber quality and stem diameter largely determine timber prices and respective uses. Silvicultural management is key to influencing tree growth and stem quality. In Germany, crop tree thinning is currently the standard treatment, while in Canada the shelterwood system is common practice. The objective of this study was to compare stem characteristics related to stem quality of northern red oaks from Canada with those from Germany to determine effects of different silvicultural treatments on stem quality. We examined stem characteristics from a total of 150 dominant northern red oaks in Canadian and German forest stands using the terrestrial laser scanning approach. Northern red oak stems in Canada (shelterwood system) were significantly straighter, whereas German stems (crop tree thinning approach) were significantly smoother on the surface and rounder on the upper parts of the stems (height 4 – 8 m). The number of bark anomalies decreased with increasing tree competition, indicating that competition is the main driver influencing external stem form and the occurrence or persistence of bark anomalies.


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