Juscelina Arcanjo dos Santos, Natália Ribeiro Paula, D. Souza, D. Carvalho, G. E. Brondani
Due to the intense exploitation of its essential oil over the years, Ocotea odorifera was included in the endangered species in Brazil. In this context, the micro-propagation technique is an alternative to sexual propagation, and consequently, it favors the conservation of the species. Thus, the objective of this study was to produce seedlings of O. odorifera through the micro-propagation technique. Seed collection was carried out in mother trees distributed in a natural stand. In vitro cultivation was divided into three phases: (i) in vitro germination and establishment; (ii) elongation and rooting and (iii) acclimatization. For explant disinfestation, a 3x2 factorial was used: three sources of propagules (seed, embryo and nodal segment) combined with two immersion times in NaClO (50%) (5 and 10 min), totaling 6 treatments. In the in vitro establishment, two culture media (MS supplemented with ANA and BAP) combined with or without the addition of activated charcoal were tested. In the elongation and rooting phase, the presence and absence of activated charcoal in the development of shoots was evaluated. For the acclimatization of seedlings and shoots, two ex vitro conditions were evaluated: in a growth room environment and in a nursery. We found significant differences between the evaluated treatments. The embryo-type propagule source and disinfested with 50% NaClO for 10 minutes showed the best morphological characteristics of germination and development. The addition of charcoal to basic MS medium, and free from plant regulators, reduced tissue oxidation in the elongation and rooting phase. Shoots of Ocotea odorifera developed in vitro and adapted well to ex vitro acclimatization conditions. Therefore, the micro-propagation protocol used in this work was efficient, providing the production of healthy and suitable seedlings for field conditions.
{"title":"Plant production of Ocotea odorifera (Vell.) Rohwer by the micro-propagation technique","authors":"Juscelina Arcanjo dos Santos, Natália Ribeiro Paula, D. Souza, D. Carvalho, G. E. Brondani","doi":"10.18671/scifor.v50.04","DOIUrl":"https://doi.org/10.18671/scifor.v50.04","url":null,"abstract":"Due to the intense exploitation of its essential oil over the years, Ocotea odorifera was included in the endangered species in Brazil. In this context, the micro-propagation technique is an alternative to sexual propagation, and consequently, it favors the conservation of the species. Thus, the objective of this study was to produce seedlings of O. odorifera through the micro-propagation technique. Seed collection was carried out in mother trees distributed in a natural stand. In vitro cultivation was divided into three phases: (i) in vitro germination and establishment; (ii) elongation and rooting and (iii) acclimatization. For explant disinfestation, a 3x2 factorial was used: three sources of propagules (seed, embryo and nodal segment) combined with two immersion times in NaClO (50%) (5 and 10 min), totaling 6 treatments. In the in vitro establishment, two culture media (MS supplemented with ANA and BAP) combined with or without the addition of activated charcoal were tested. In the elongation and rooting phase, the presence and absence of activated charcoal in the development of shoots was evaluated. For the acclimatization of seedlings and shoots, two ex vitro conditions were evaluated: in a growth room environment and in a nursery. We found significant differences between the evaluated treatments. The embryo-type propagule source and disinfested with 50% NaClO for 10 minutes showed the best morphological characteristics of germination and development. The addition of charcoal to basic MS medium, and free from plant regulators, reduced tissue oxidation in the elongation and rooting phase. Shoots of Ocotea odorifera developed in vitro and adapted well to ex vitro acclimatization conditions. Therefore, the micro-propagation protocol used in this work was efficient, providing the production of healthy and suitable seedlings for field conditions.","PeriodicalId":54443,"journal":{"name":"Scientia Forestalis","volume":"86 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76364252","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}
André Ribeiro Silveira, Wellington Willian Rocha, Â. M. Leite, J. D. J. Santos, Moacir de Souza Dias Júnior
{"title":"Capacidade de suporte de cargas de um Latossolo submetido a duas alternativas de uso do solo e sob Floresta Nativa","authors":"André Ribeiro Silveira, Wellington Willian Rocha, Â. M. Leite, J. D. J. Santos, Moacir de Souza Dias Júnior","doi":"10.18671/scifor.v50.05","DOIUrl":"https://doi.org/10.18671/scifor.v50.05","url":null,"abstract":"","PeriodicalId":54443,"journal":{"name":"Scientia Forestalis","volume":"183 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76206064","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}
J. Pezzopane, Jessily Medeiros Quaresma, Mariana Duarte Silva Fonseca, R. N. Nóia Júnior, Talita Miranda Teixeira Xavier, Genilda Canuto Amaral, P. C. Cavatte, Jonas Souza Vinco
Plants subjected to successive water deficit cycles may be able to rapidly develop acclimatization responses. Thus, the objective of this study was to analyze the acclimatization capacity of the photosynthetic machinery of rubber tree seedlings submitted to water deficit cycles (WDC). To do so, we designed four treatments: control plants (fully irrigated, CT); 0P (not previously submitted to any WDC); 1P (previously submitted to one WDC); and 2P (previously submitted to two WDC). The water deficit cycle was characterized by suspending irrigation until rubber tree net assimilation rate (A) reached zero (A≤0). Then the plants were rehydrated until substrate moisture reached its maximum water retention capacity, and the irrigation was maintained until the rate A of the plants recovering from water deficit reached 90% of the rate of the control plant, and then a new cycle of water deficit started again. In the third and last cycle (WDC3), treatments 0P, 1P and 2P were simultaneously subjected to water deficit and comparative eco-physiological evaluations between treatments when each group of plants reached A≤0. After WDC3, 2P plants achieved greater A, stomatal conductance, transpiration and intrinsic efficiency of water use after 21 days, compared to 1P and 0P plants. The leaves of treatments 2P and 0P showed the same relative water content (RWC), higher photosynthetic pigment concentration, and 2P showed greater water absorption capacity in the substrate under low water availability, maintaining high A values in comparison with the other treatments 36 days after the start of WDC3. The results indicate that the 2P plants showed acclimatization of the photosynthetic machinery in maintaining a positive carbon balance when subjected to WDC, indicating that leaf turgor was maintained through cellular and osmotic adjustment, accumulation of photosynthetic pigments and greater soil water absorption capacity.
{"title":"Photosynthetic acclimatization to cyclical water deficit in rubber tree seedlings","authors":"J. Pezzopane, Jessily Medeiros Quaresma, Mariana Duarte Silva Fonseca, R. N. Nóia Júnior, Talita Miranda Teixeira Xavier, Genilda Canuto Amaral, P. C. Cavatte, Jonas Souza Vinco","doi":"10.18671/scifor.v50.03","DOIUrl":"https://doi.org/10.18671/scifor.v50.03","url":null,"abstract":"Plants subjected to successive water deficit cycles may be able to rapidly develop acclimatization responses. Thus, the objective of this study was to analyze the acclimatization capacity of the photosynthetic machinery of rubber tree seedlings submitted to water deficit cycles (WDC). To do so, we designed four treatments: control plants (fully irrigated, CT); 0P (not previously submitted to any WDC); 1P (previously submitted to one WDC); and 2P (previously submitted to two WDC). The water deficit cycle was characterized by suspending irrigation until rubber tree net assimilation rate (A) reached zero (A≤0). Then the plants were rehydrated until substrate moisture reached its maximum water retention capacity, and the irrigation was maintained until the rate A of the plants recovering from water deficit reached 90% of the rate of the control plant, and then a new cycle of water deficit started again. In the third and last cycle (WDC3), treatments 0P, 1P and 2P were simultaneously subjected to water deficit and comparative eco-physiological evaluations between treatments when each group of plants reached A≤0. After WDC3, 2P plants achieved greater A, stomatal conductance, transpiration and intrinsic efficiency of water use after 21 days, compared to 1P and 0P plants. The leaves of treatments 2P and 0P showed the same relative water content (RWC), higher photosynthetic pigment concentration, and 2P showed greater water absorption capacity in the substrate under low water availability, maintaining high A values in comparison with the other treatments 36 days after the start of WDC3. The results indicate that the 2P plants showed acclimatization of the photosynthetic machinery in maintaining a positive carbon balance when subjected to WDC, indicating that leaf turgor was maintained through cellular and osmotic adjustment, accumulation of photosynthetic pigments and greater soil water absorption capacity.","PeriodicalId":54443,"journal":{"name":"Scientia Forestalis","volume":"212 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89084512","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}
Alice Neri da Silva Sousa, Keiti Roseani Mendes Pereira, A. F. Dias Júnior, Matheus Bertotti Floriani, M. Brand
{"title":"Charcoal produced from Attalea tessmannii Burret. fruit wastes","authors":"Alice Neri da Silva Sousa, Keiti Roseani Mendes Pereira, A. F. Dias Júnior, Matheus Bertotti Floriani, M. Brand","doi":"10.18671/scifor.v50.01","DOIUrl":"https://doi.org/10.18671/scifor.v50.01","url":null,"abstract":"","PeriodicalId":54443,"journal":{"name":"Scientia Forestalis","volume":"56 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87831866","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}
William Rodrigues Martins, R. S. Corrêa, Juliano Pereira de Sousa, Paloma Pimentel de Souza
The search for alternative sources of fuel has modified traditional models of forest production, with new concepts emerging and with new problems for production. Therefore, the biomass and carbon in stands of three Eucalyptus urophylla x E. grandis hybrid clones at two densely planted spacings were quantified. The study was implemented in a completely casualized design, with hybrid clones AEC 1528, I144 and GG100 at spacings of 3.0 m x 0.5 m and 3.0 m x 1.0 m, with 3 replications and 50 plants per plot. After 33 months the trees were harvested for biomass and carbon quantification. The hybrids I144 and GG100 yielded higher productions of biomass and carbon of stemwood and stembark. The smaller spacing increased the production of biomass in all evaluated compartments but did not change the carbon concentration.
寻找替代燃料来源改变了传统的森林生产模式，出现了新的概念和新的生产问题。为此，对3个尾巨桉(Eucalyptus urophylla x E. grandis)杂交无性系在2个密植间距下的林分生物量和碳进行了定量分析。试验采用完全随机化设计，以杂交无性系AEC 1528、I144和GG100为试验材料，株距分别为3.0 m × 0.5 m和3.0 m × 1.0 m, 3个重复，每亩50株。33个月后，采伐树木进行生物量和碳量化。杂交品种I144和GG100的茎材和主干生物量和碳产量均较高。较小的间距增加了所有评价室的生物量产量，但没有改变碳浓度。
{"title":"Biomass and carbon in two planting densities of eucalypt hybrids of energy forests","authors":"William Rodrigues Martins, R. S. Corrêa, Juliano Pereira de Sousa, Paloma Pimentel de Souza","doi":"10.18671/scifor.v50.02","DOIUrl":"https://doi.org/10.18671/scifor.v50.02","url":null,"abstract":"The search for alternative sources of fuel has modified traditional models of forest production, with new concepts emerging and with new problems for production. Therefore, the biomass and carbon in stands of three Eucalyptus urophylla x E. grandis hybrid clones at two densely planted spacings were quantified. The study was implemented in a completely casualized design, with hybrid clones AEC 1528, I144 and GG100 at spacings of 3.0 m x 0.5 m and 3.0 m x 1.0 m, with 3 replications and 50 plants per plot. After 33 months the trees were harvested for biomass and carbon quantification. The hybrids I144 and GG100 yielded higher productions of biomass and carbon of stemwood and stembark. The smaller spacing increased the production of biomass in all evaluated compartments but did not change the carbon concentration.","PeriodicalId":54443,"journal":{"name":"Scientia Forestalis","volume":"71 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83342038","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}
Pub Date : 2021-12-01DOI: 10.18671/scifor.v49n132.11
Tainah Silva Narducci, J. Yared, Sílvio Brienza Junior
{"title":"Banco de sementes do solo sob plantios de Tachigali vulgaris (L.G.Silva & H.C.Lima) em diferentes espaçamentos na região leste do Estado do Pará, Amazônia","authors":"Tainah Silva Narducci, J. Yared, Sílvio Brienza Junior","doi":"10.18671/scifor.v49n132.11","DOIUrl":"https://doi.org/10.18671/scifor.v49n132.11","url":null,"abstract":"","PeriodicalId":54443,"journal":{"name":"Scientia Forestalis","volume":"86 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83499095","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}
Pub Date : 2021-12-01DOI: 10.18671/scifor.v49n132.02
F. Amaral, E. F. Araújo, A. E. Furtini Neto, A. V. Inda, M. Mancini, N. Curi
Forestry continuously grows in Brazil and it increases the concerns among planted forest companies regarding sustainable production. Knowledge about soil mineral reserves and nutrient release kinetics may introduce an opportunity to optimize fertility management, improving production. The objectives of this study were to evaluate the contents of K, Ca and Mg in the reserve, non-exchangeable, exchangeable and available soil compartments and the nutrient release speed, as well as their correlations and effects on eucalypt productivity. Soil samples were collected from eucalypt plantation sites at the state of Rio Grande do Sul, Brazil, comprising seven soil classes. The contents of K, Ca and Mg were determined in sulfuric digestion extract, boiling nitric acid, ammonium chloride, Mehlich-1 and potassium chloride. Nutrient release kinetics were evaluated per Sparks (1989), while CMPC Celulose Riograndense provided the wood volumetric annual average increment (AAI) from the eucalypt plantations. The contents of K, Ca and Mg varied between compartments and depths and were concentrated in the reserve compartment, indicating the importance of this compartment for midand long-term nutrient supply. Most compartments of K, Ca and Mg showed significant correlation; and eucalypt wood productivity (AAI) correlated significantly with the different compartments in both depths, mainly with the reserve compartment and release kinetics expressing their relevance for productivity; in particular for the case of long-cycle plant species, where nutrient release at intermediate and long terms is important.
{"title":"Wood annual average increment and K, Ca and Mg mineral compartments in soils cultivated with eucalypt","authors":"F. Amaral, E. F. Araújo, A. E. Furtini Neto, A. V. Inda, M. Mancini, N. Curi","doi":"10.18671/scifor.v49n132.02","DOIUrl":"https://doi.org/10.18671/scifor.v49n132.02","url":null,"abstract":"Forestry continuously grows in Brazil and it increases the concerns among planted forest companies regarding sustainable production. Knowledge about soil mineral reserves and nutrient release kinetics may introduce an opportunity to optimize fertility management, improving production. The objectives of this study were to evaluate the contents of K, Ca and Mg in the reserve, non-exchangeable, exchangeable and available soil compartments and the nutrient release speed, as well as their correlations and effects on eucalypt productivity. Soil samples were collected from eucalypt plantation sites at the state of Rio Grande do Sul, Brazil, comprising seven soil classes. The contents of K, Ca and Mg were determined in sulfuric digestion extract, boiling nitric acid, ammonium chloride, Mehlich-1 and potassium chloride. Nutrient release kinetics were evaluated per Sparks (1989), while CMPC Celulose Riograndense provided the wood volumetric annual average increment (AAI) from the eucalypt plantations. The contents of K, Ca and Mg varied between compartments and depths and were concentrated in the reserve compartment, indicating the importance of this compartment for midand long-term nutrient supply. Most compartments of K, Ca and Mg showed significant correlation; and eucalypt wood productivity (AAI) correlated significantly with the different compartments in both depths, mainly with the reserve compartment and release kinetics expressing their relevance for productivity; in particular for the case of long-cycle plant species, where nutrient release at intermediate and long terms is important.","PeriodicalId":54443,"journal":{"name":"Scientia Forestalis","volume":"451 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76351114","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}
Pub Date : 2021-12-01DOI: 10.18671/scifor.v49n132.17
Thiago Wendling Gonçalves de Oliveira, A. Higa, L. D. Silva
This study aimed to optimize the genetic gain for initial growth, low rust infection, and wood quality in an open pollination progeny test of E. grandis. The progeny test was established in Anhembi-SP, in a randomized block design, with 176 progenies, single tree plots, 29 replications, and one external borderline. Three evaluations were carried out. For the variable related to growth, diameter at breast height (DBH); evaluation at 20 months of age; for the degree of rust infection (DRI) the evaluations were carried out at 9 months of age, and for wood quality the variable number of branches (NB) was evaluated at 14 months. The choice of these variables considered the estimates of heritability and genetic correlations. Eight selection methods were used to optimize genetic gains for each variable, such as indirect selection, independent levels, and combined selection indexes with equal and different weights for each variable. The breeding strategies were based on the formation of Seedling Seed Orchards (SSO) and Clonal Seed Orchards (CSO). Based on the results, the indirect selection was not recommended because genetic correlations between DBH, DRI, and NB were weak (< 0.50), and it was necessary to consider the three variables for the construction of selection indexes and independent levels. For both breeding strategies the independent selection levels were the best in optimizing simultaneous selection for growth, rust resistance, and wood quality; with gains for DBH, DRI, and NB of 5.83%, 13.88%, and 4.12%, respectively for the formation of SSOs; while gains of 7.23%, 18.76%, and 6.72% were calculated respectively for the formation of CSOs.
{"title":"Optimization of genetic gain in different variables for Eucalyptus grandis Hill ex Maiden breeding","authors":"Thiago Wendling Gonçalves de Oliveira, A. Higa, L. D. Silva","doi":"10.18671/scifor.v49n132.17","DOIUrl":"https://doi.org/10.18671/scifor.v49n132.17","url":null,"abstract":"This study aimed to optimize the genetic gain for initial growth, low rust infection, and wood quality in an open pollination progeny test of E. grandis. The progeny test was established in Anhembi-SP, in a randomized block design, with 176 progenies, single tree plots, 29 replications, and one external borderline. Three evaluations were carried out. For the variable related to growth, diameter at breast height (DBH); evaluation at 20 months of age; for the degree of rust infection (DRI) the evaluations were carried out at 9 months of age, and for wood quality the variable number of branches (NB) was evaluated at 14 months. The choice of these variables considered the estimates of heritability and genetic correlations. Eight selection methods were used to optimize genetic gains for each variable, such as indirect selection, independent levels, and combined selection indexes with equal and different weights for each variable. The breeding strategies were based on the formation of Seedling Seed Orchards (SSO) and Clonal Seed Orchards (CSO). Based on the results, the indirect selection was not recommended because genetic correlations between DBH, DRI, and NB were weak (< 0.50), and it was necessary to consider the three variables for the construction of selection indexes and independent levels. For both breeding strategies the independent selection levels were the best in optimizing simultaneous selection for growth, rust resistance, and wood quality; with gains for DBH, DRI, and NB of 5.83%, 13.88%, and 4.12%, respectively for the formation of SSOs; while gains of 7.23%, 18.76%, and 6.72% were calculated respectively for the formation of CSOs.","PeriodicalId":54443,"journal":{"name":"Scientia Forestalis","volume":"9 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77245822","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}
Pub Date : 2021-12-01DOI: 10.18671/scifor.v49n132.09
Lucas Henderson de Oliveira Santos, João Paulo Sardo Madi, L. M. G. R. Diaz, Gláucia Miranda Ramirez, É. C. Souza, G. M. Nunes, A. P. D. Corte, M. P. D. L. C. E. Carvalho, C. Silva, S. P. C. Carvalho
Geo-technological information is increasingly used to monitor forest stands through analytical techniques and procedures for large-scale plantations. The objective of this study was to evaluate the relationship between spectral variables (through vegetation index) using images from the RapidEye satellite, dendrometric variables and the uniformity index in teak plantations by applying principal component analysis. The experiment was implemented in 2015, distributed in 12 experimental units, and 50 trees were measured per unit. The field data were obtained from the forest inventory carried out in May 2019, when data on total height (ht) and diameter at 1.30 m height (dbh) of all trees were collected. A strong negative correlation was observed between vegetation indexes and dendrometric variables with uniformity index. The main component analysis indicated the possibility of differentiating uniform from Relationship between spectral variables with RapidEye images and dendrometric variables in teak plantations using principal component analysis Scientia Forestalis, 49(132), e3655, 2021 2/11 non-uniform plantations. Therefore, it is possible to predict uniformity in teak stands through the correlation between dendrometric variables and spectral variables from the RapidEye satellite.
{"title":"Relationship between spectral variables with RapidEye images and dendrometric variables in teak plantations using principal component analysis","authors":"Lucas Henderson de Oliveira Santos, João Paulo Sardo Madi, L. M. G. R. Diaz, Gláucia Miranda Ramirez, É. C. Souza, G. M. Nunes, A. P. D. Corte, M. P. D. L. C. E. Carvalho, C. Silva, S. P. C. Carvalho","doi":"10.18671/scifor.v49n132.09","DOIUrl":"https://doi.org/10.18671/scifor.v49n132.09","url":null,"abstract":"Geo-technological information is increasingly used to monitor forest stands through analytical techniques and procedures for large-scale plantations. The objective of this study was to evaluate the relationship between spectral variables (through vegetation index) using images from the RapidEye satellite, dendrometric variables and the uniformity index in teak plantations by applying principal component analysis. The experiment was implemented in 2015, distributed in 12 experimental units, and 50 trees were measured per unit. The field data were obtained from the forest inventory carried out in May 2019, when data on total height (ht) and diameter at 1.30 m height (dbh) of all trees were collected. A strong negative correlation was observed between vegetation indexes and dendrometric variables with uniformity index. The main component analysis indicated the possibility of differentiating uniform from Relationship between spectral variables with RapidEye images and dendrometric variables in teak plantations using principal component analysis Scientia Forestalis, 49(132), e3655, 2021 2/11 non-uniform plantations. Therefore, it is possible to predict uniformity in teak stands through the correlation between dendrometric variables and spectral variables from the RapidEye satellite.","PeriodicalId":54443,"journal":{"name":"Scientia Forestalis","volume":"129 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86839865","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}
Pub Date : 2021-12-01DOI: 10.18671/scifor.v49n132.19
T. Pimentel, Peter Wimmer, Helder Resende de Carvalho, Luciano Roitman, C. Menezzi
{"title":"Resistência ao cisalhamento da linha de cola em madeiras tropicais amazônicas","authors":"T. Pimentel, Peter Wimmer, Helder Resende de Carvalho, Luciano Roitman, C. Menezzi","doi":"10.18671/scifor.v49n132.19","DOIUrl":"https://doi.org/10.18671/scifor.v49n132.19","url":null,"abstract":"","PeriodicalId":54443,"journal":{"name":"Scientia Forestalis","volume":"22 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77814534","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}
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