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NUMERICAL ANALYSIS OF HARDWOOD TIMBER BEAMS REINFORCED WITH STEEL PLATE SCREWED 钢板螺纹加固硬木梁的数值分析
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2022-01-01 DOI: 10.1590/1806-908820220000019
Pedro Ignácio Lima Gadêlha Jardim, Fernando Júnior Resende Mascarenhas, Diego Henrique de Almeida, Francisco Antonio Rocco Lahr, André Luis Christoforo
– There are several technologies to recover and strengthen timber structures. Two usual alternatives are: the use of steel plates screwed and carbon fi ber mats glued with epoxy adhesive. A gap was observed in the literature regarding the study of reinforcement in hardwood timber beams with cross-section loss, commonly found in attacks by biotic or abiotic agents. This study aimed to analyze the fl exural stiff ness recovery capacity of steel plate screwed to a timber beam with diff erent cross-sectional losses, with a special interest in the eff ect caused by diff erent bolt arrangements. The results were compared with simulations made using a carbon fi ber mat (CF). It was possible to observe that, despite presenting lower effi ciency than the CD, the use of steel plate screwed could return the initial stiff ness in some models, and the specifi cation of the bolts is relevant in obtaining the results.
-有几种技术可以恢复和加强木结构。常用的两种替代方法是:采用钢板旋紧和碳纤维垫用环氧胶粘接。在研究具有截面损失的硬木木梁加固的文献中观察到一个缺口,通常在生物或非生物制剂的攻击中发现。本研究旨在分析具有不同截面损失的钢板在木梁上的抗弯刚度恢复能力,并特别关注不同螺栓布置所产生的影响。结果与碳纤维垫(CF)的模拟结果进行了比较。可以观察到,尽管使用钢板螺钉的效率低于CD,但在某些模型中使用钢板螺钉可以恢复初始刚度,并且螺栓的规格与获得结果有关。
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引用次数: 2
FIRE EFFECTS ON NATURAL REGENERATION IN SEASONAL SEMIDECIDUOUS FOREST 火灾对季节性半落叶森林自然更新的影响
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2022-01-01 DOI: 10.1590/1806-908820220000014
Fábia Maria dos Santos Souza, V. B. Rodrigues, F. T. P. Torres
ABSTRACT Forest fire is considered a relevant environmental and ecological issue worldwide, as it causes population, ecosystem, and economic impacts, making monitoring and additional research necessary to understand post-fire forest recovery. Thus, the aim of this study was to evaluate the changes that occurred in the natural regeneration stratum in a fragment of Atlantic Forest in the municipality of Viçosa (MG), with and without the occurrence of fire. The phytosociological parameters and the functional diversity of the plant community were evaluated through 20 plots, 10 in the burnt area and 10 in the unburnt area, in 2018 and 2019, to follow the natural regeneration. There were collected, in the burnt and unburnt areas, respectively, 113 and 126 individuals, 23 and 16 species, and 13 and 9 botanical families. Piper sp.1, showed the highest values for the parameters: relative density, absolute frequency, and cover value, occurring in 100% of the plots. Areas with occurrence of fire present higher species richness. Species of the genus Piper occur frequently in areas of Semideciduous Seasonal Forest with signs of disturbance. The highest Shannon diversity and Pielou equitability indexes were found in the burnt area. The Jaccard index and the cluster analysis confirm the formation of groups with low similarity, showing floristic heterogeneity between the two areas, and the disturbance caused by fire is considered an important aspect for this floristic differentiation to occur. Therefore, the occurrence of forest fire in areas of Atlantic Forest increased the diversity values of species, with an increase in the equitability index, showing low floristic similarity between burnt and unburnt areas.
森林火灾在世界范围内被认为是一个相关的环境和生态问题,因为它会对人口、生态系统和经济产生影响,因此有必要进行监测和额外的研究,以了解森林火灾后的恢复。因此,本研究的目的是评估在发生火灾和没有发生火灾的情况下,维萨洛萨市(MG)大西洋森林片段中自然更新层发生的变化。在2018年和2019年,通过20个样地(10个烧毁区和10个未烧毁区)对植物群落的植物社会学参数和功能多样性进行了评估,以跟踪自然更新。在已烧和未烧地区分别采集到113和126株,23和16种,13科和9科植物。Piper sp.1的相对密度、绝对频率和覆盖值均达到最高值,在100%的样地出现。发生火灾的地区物种丰富度较高。胡椒属的物种经常出现在有干扰迹象的半落叶季节性森林地区。Shannon多样性指数和Pielou公平性指数均以毁林区最高。Jaccard指数和聚类分析证实了两区间存在低相似性类群,表明两区间的区系分化存在异质性,火灾干扰被认为是导致这种区系分化发生的重要因素。因此,大西洋林区森林火灾的发生增加了物种多样性值,公平性指数增加,燃烧区与未燃烧区区系相似性较低。
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引用次数: 0
VEGETATIVE RESCUE OF Azadirachta indica BY CUTTINGS 印楝扦插的营养挽救
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2022-01-01 DOI: 10.1590/1806-908820220000032
Cleyton dos Santos Souza, Poliana Coqueiro Dias Araújo, D. Silva, G. Nogueira, Maria Janaina Nascimento Silva
ABSTRACT Finding forest species adapted to different soil and climatic conditions and, that provide favorable attributes to commercial use is a challenge. Azadirachta indica is a potential species to attend to this goal. Thus, this paper aims to carry out the vegetative rescue of different Azadirachta indica Juss adult trees by cuttings. For that, Azadirachta indica individuals were randomly selected in a plantation of species set ten years ago and the cut was carried out at 30 cm in height. In sequence, verification was carried out on: (a) the stem cut ability to regrowth (collections and measurements of the shoot length on the 15th, 30th, 45th, and 60th days); (b) the need to use exogenous auxin for rooting induction [testing 0 (control), 2000, 4000, and 6000 mg.l-1 of Indole-3-butyric acid (IBA)]; (c) the ideal of the propagule size (with 8 cm and 13 cm in height); and (c) the rooting dynamics (every seven days for thirty-five days; the propagules were evaluated for callus formation, oxidation, and rooting). The species showed high regrowth ability, as well as easy rooting with or without the use of IBA; it was found that the ideal size for the propagule is 13 cm and that the process of rooting and root elongation is completed after thirty-five days of staking. The conclusion is: (a) using cuttings for the species vegetative rescue is interesting; (b) 13 cm is considered appropriate for the propagule size, and; (c) the aid of IBA at a dose of 2,000 mg L-1 is ideal to standardize rooting.
寻找适应不同土壤和气候条件的森林物种,并为商业利用提供有利的属性是一个挑战。印度印楝是实现这一目标的潜在物种。因此,本文旨在通过扦插对印楝不同成树进行营养抢救。为此,在一个十年前设置的物种种植园中随机选择印度印楝个体,并在30厘米高的地方进行切割。依次验证:(a)茎割再生能力(第15、30、45、60天的茎长采集和测量);(b)需要使用外源生长素来诱导生根[试验0(对照),2000,4000和6000 mg。吲哚-3-丁酸(IBA)的l-1];(c)理想的繁殖体大小(8厘米和13厘米);(c)生根动态(每7 d一次,连续35 d;对愈伤组织形成、氧化和生根进行了评价。使用或不使用IBA均表现出较高的再生能力和易于生根;结果表明,该繁殖体的理想大小为13 cm,生根和伸长过程在定植35天后完成。结论是:(a)利用插枝进行物种的营养抢救是有意义的;(b) 13厘米被认为适合于繁殖体的大小;(c) 2000 mg L-1的IBA对标准化生根最理想。
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引用次数: 1
CAN TIMBER HOUSES BE PRODUCTIVELY FASTER TO BUILD THAN OTHER BUILDINGS? 木质房屋的建造速度是否比其他建筑更快?
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2022-01-01 DOI: 10.1590/1806-908820220000023
V. Araujo, J. Vasconcelos, Juliana Cortez-Barbosa, E. Morales, M. Gava, J. Garcia
ABSTRACT To identify the time spent with the different construction techniques of timber houses, this study evaluates the execution time of different models available in Brazil. Using face-to-face interviews, semi-structured questionnaires were randomly applied to collect average time according to distinct production methods. The most efficient techniques were: ‘clapboard and wainscot’, ‘post-and-beam’, and ‘log-home’ using artisanal production; ‘clapboard and wainscot’, ‘stick framing with masonry’, and ‘post-and-beam’ in semi-industrial process; and, ‘modular for building sites’, ‘modular in cross-laminated timber’ and ‘modular woodframe’ in industrial production. Different industrial developers were not as agile as artisanal competitors due to production obstacles in customized projects. Timber construction offers lower execution time than masonry, representing an agile form to build a versatile sustainable dwelling.
摘要:为了确定不同木材房屋建造技术所花费的时间,本研究评估了巴西不同模型的执行时间。采用面对面访谈,随机采用半结构化问卷,根据不同的生产方法收集平均时间。最有效的技术是:“隔板和护墙板”,“后梁”和“原木”使用手工生产;“护墙板和护墙板”、“砖石框架”和半工业过程中的“柱梁”;此外,“建筑工地的模块化”、“交叉层压木材的模块化”和“工业生产的模块化木框架”。由于定制项目的生产障碍,不同的工业开发商不如手工竞争者敏捷。木结构比砖石结构的施工时间更短,代表了一种灵活的形式,可以建造多功能的可持续住宅。
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引用次数: 2
PROPERTIES OF CROSS-LAMINATED TIMBER BONDED WITH AN ADHESIVE BASED ON TANNINS FROM THE BARK OF Mimosa tenuiflora TREES 含水草树皮单宁胶粘剂粘合交叉层合木材的性能研究
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2022-01-01 DOI: 10.1590/1806-908820220000020
Bruna Rafaella Ferreira da Silva, João Gilberto Meza Ucella-Filho, E. C. Souza, Thalles Luiz Negreiros da Costa, T. Azevêdo, F. Mori, A. Pimenta
ABSTRACT This study aimed to determine the concentration of condensed tannins in the bark of Mimosa tenuiflora (Willd) Poir trees. Additionally, the physical-mechanical properties of cross-laminated timber (CLT) panels bonded with an adhesive based on M. tenuiflora tannins were assessed. Bark was collected from five trees. The adhesive formulation was synthesized by mixing powdered tannins, paraformaldehyde, and water at 50 °C under continuous stirring. Bark tannins extract in its pristine state without any previous chemical treatment or modification was employed to synthesize the adhesive. Viscosity, pH, solids content, and gel time of the adhesive formulation were determined. CLT panels were manufactured with Eucalyptus spp. wood. The bonding performance was assessed by determining the physical (apparent density and water absorption) and mechanical (modulus of elasticity – MOE, modulus of rupture – MOR, and shear strength) properties of the CLT panels. Condensed tannins content in the M. tenuiflora bark was 23.4%. Adhesive properties were pH = 3.93, TS of 50.64%, gel time of 460 s, and 6,000 cP for viscosity. Values of MOE, MOR and shear strength were 4,411, 16.18, and 1.06 MPa, respectively. The M. tenuiflora tannins are promising for the formulation of adhesives to bond CLT.
摘要本研究旨在测定含羞草(野生)树皮中缩合单宁的含量。此外,我们还评估了用基于tenuflora单宁的胶粘剂粘合的交叉层压木材(CLT)板的物理力学性能。从五棵树上收集树皮。将粉末单宁、多聚甲醛和水在50℃下连续搅拌,合成胶粘剂配方。采用未经过任何化学处理或改性的原始树皮单宁提取物合成胶粘剂。测定了胶粘剂配方的粘度、pH、固形物含量和凝胶时间。CLT板是用桉树木材制造的。通过测定CLT板的物理(表观密度和吸水率)和力学(弹性模量- MOE,断裂模量- MOR和抗剪强度)性能来评估粘接性能。藤黄树皮中缩合单宁含量为23.4%。黏附性能:pH = 3.93, TS为50.64%,凝胶时间为460 s,黏度为6000 cP。MOE、MOR和抗剪强度分别为4411、16.18和1.06 MPa。tenuflora单宁在CLT胶粘剂的研制中具有广阔的应用前景。
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引用次数: 1
ASSESSMENT OF INDUSTRIAL PERFORMANCE FOR MARKET PULP PRODUCTION BETWEEN EUCALYPT AND Corymbia HYBRIDS CLONES 桉树与山茱萸杂交无性系市场纸浆生产的工业性能评价
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2022-01-01 DOI: 10.1590/1806-908820220000028
M. Costa, T. Nogueira, R. Bittencourt, W. O. D. Silva, Larissa Soares Silva, R. F. Almeida, G. Santos, C. Pena
ABSTRACT The search for novel biomasses for uses as alternative fiber sources, similar to Eucalyptus spp. biomass, holds great value and potential for commercial-scale application. This study aims to present the hybrid clones of Corymbia spp. developed by Aperam BioEnergia as potential substitutes for Eucalyptus wood in the market pulp industry. By performing modified kraft pulping and chemical characterization analyses, it was possible to compare the biomass of Eucalyptus spp. with that of Corymbia spp. Comparisons were made by analyzing their respective pulp average growth rate (PAGR) and specific wood consumption (SWC), estimated using a kappa number of 19 ± 1. The results showed that one of the hybrid clones (Corymbia citriodora × Corymbia torelliana - ID 4) had highest PAGR#k19, and lowest SWC than other samples. Clone ID 4 showed lowest value of SWC since, simultaneously presented a higher value of wood basic density and screened yield. Consequently, in agreement with its best results, clone ID 4 had the highest-ranking score, calculated as the PAGR/SWC ratio. This genetic material also showed one of the lowest total lignin content, consequently the highest screening yield. Besides Clone ID 4 showed significantly highest xylan content, among wood samples assessed in this work. For that reason, the ID 4 was the highest-ranked, proving to be an excellent high-performance alternative for forest-industry interface parameters.
寻找新的生物质作为替代纤维来源,类似于桉树的生物质,具有巨大的商业规模应用价值和潜力。本研究旨在介绍由Aperam BioEnergia公司开发的Corymbia spp.的杂交无性系,作为市场纸浆工业中桉树木材的潜在替代品。利用kappa值为19±1的平均纸浆生长率(PAGR)和木材耗用率(SWC),对桉木和杉木的生物量进行了比较。结果表明,其中一个杂交无性系(citriodora × Corymbia torelliana - id4)的PAGR#k19值最高,SWC值最低。无性系id4的SWC值最低,但木材基本密度和筛分产量较高。因此,与最佳结果一致,克隆ID 4的排名得分最高,计算为PAGR/SWC比率。该遗传物质也显示出最低的总木质素含量之一,因此筛选产量最高。此外,克隆ID 4的木聚糖含量在本研究评估的木材样品中显著最高。出于这个原因,id4是排名最高的,证明是森林工业接口参数的优秀高性能替代方案。
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引用次数: 0
GERMINATION AND POST-SEMINAL DEVELOPMENT OF Astrocaryum murumuru MART. PROGENIES 豆蔻的萌发和种后发育。后代
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2022-01-01 DOI: 10.1590/1806-908820220000029
J. G. D. Santos, S. A. D. N. Ferreira, D. Gentil
ABSTRACT Astrocaryum murumuru is a palm tree whose seeds have been exploited in an extractive way by traditional populations in the Amazon, providing raw material to the cosmetic industry, with lack of information about its propagation. Thus, the aim of this study was to characterize seeds, germination, and seedling development of different A murumuru progenies. Seeds from six racemes from different plants were used, which were physically characterized and sown in a completely randomized design, with six treatments (progenies) and four replicates. Description, illustration, and quantification of the mean time of the different seedling stages were performed. On average, the diameter, length, and mass of soaked seeds were 17.1 ± 1.2 mm, 28.4 ± 5.8 mm, and 3.3 ± 0.6 g, respectively. A. murumuru germination is of adjacent type, with the cotyledon sheath developing next to the seed. Seedling development took an average of 46 ± 28 days to reach the germinative bud stage and 225 ± 38 days to reach the third expanded eophyll stage. The emergence of the first cataphyll (normal seedling) ranged from 12 to 73% among progenies, which occurred in an average time of 73 ± 29 days. There is a need to improve the processing of A. murumuru seeds aiming to reduce seed loss during this process, as well as studies on seed dormancy. Progenies showed variation regarding the physical and physiological characteristics of seeds and seedlings. Germination and seedling development can be considered slow, with variable times among progenies.
Astrocaryum murumuru是一种棕榈树,其种子被亚马逊地区的传统人群以提取方式开采,为化妆品行业提供原料,但缺乏有关其繁殖的信息。因此,本研究的目的是表征不同子代的种子、萌发和幼苗发育。选用不同植株的6个总状花序种子,进行物理性状鉴定,采用完全随机设计,6个处理(子代),4个重复。对不同苗期的平均时间进行了描述、说明和量化。浸渍种子的平均直径为17.1±1.2 mm,长度为28.4±5.8 mm,质量为3.3±0.6 g。种子萌发为邻近型,子叶鞘在种子旁边发育。幼苗发育平均需要46±28 d才能达到发芽期,225±38 d才能达到膨大期。第一个葡萄树(正常幼苗)的出苗率为12% ~ 73%,平均时间为73±29 d。为了减少种子在加工过程中的损失,还需要进一步改进种子的加工工艺,并对种子休眠进行研究。后代在种子和幼苗的生理特性上存在差异。发芽和幼苗发育可以被认为是缓慢的,后代之间的时间是可变的。
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引用次数: 0
FUNGI OF THE BOTRYOSPHAERIACEAE FAMILY CAUSE DIFFERENT LEVELS OF STEM CANKER ON PECAN TREES (Carya illinoinensis) IN BRAZIL 摘要巴西山核桃树(山核桃)的茎溃疡病是由BOTRYOSPHAERIACEAE真菌引起的
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2022-01-01 DOI: 10.1590/1806-908820220000015
J. M. Rolim, J. E. Rabuske, L. G. Savian, C. Walker, J. S. Sarzi, J. C. P. Silva, M. Muniz
ABSTRACT Pecan tree [Carya illinoinensis (Wangenh.) K. Koch] is a widespread species in the southern region of Brazil and commercially important for nut and wood production. Stem cankers in pecan trees negatively impact the orchard, but the biotic causes of cankers are usually not identified. Symptoms of stem canker were observed in about 60% of pecan trees from orchards in the states of Rio Grande do Sul and Paraná. Therefore, this study aimed to analyze the molecular and morphophysiological characteristics of fungi associated with pecan canker in orchards in southern Brazil and to confirm their pathogenicity in pecan seedlings. Samples from symptomatic stems were collected in different municipalities and possible causal agents were isolated. Molecular identification was performed by the Polymerase Chain Reaction technique for amplification of the EF-1α region and subsequent sequencing. The sequencing, followed by morphophysiological aspects of mycelial growth and colony pigmentation, allowed the identification of a species complex included in the Botryosphaeriaceae family. The isolates were classified as Lasiodiplodia theobromae, Pseudofusicoccum kimberleyense and Neofusicoccum parvum. Pathogenicity was tested by inoculating the isolates into pecan seedlings to evaluate the symptoms. All isolates caused canker in the stem, but there was variation in the severity. Therefore, different species of the Botryosphaeriaceae family are responsible for stem canker occurrence in pecan trees in the southern region of Brazil, but at different levels of injury. Thus, it is crucial to identify and understand the behavior of the fungal isolates to best control cankers in pecan orchards.
山核桃[Carya illinensis (Wangenh.)][K. Koch]是巴西南部地区广泛分布的树种,对坚果和木材生产具有重要的商业价值。核桃树的茎溃疡病对果园有负面影响,但引起溃疡病的生物原因通常不确定。在巴西南大德州和帕拉纳州的果园中,大约60%的山核桃树出现了茎溃疡病的症状。因此,本研究旨在分析巴西南部果园山核桃溃疡病相关真菌的分子和形态生理特征,并确认其在山核桃幼苗中的致病性。在不同的城市采集了有症状的茎标本,并分离出可能的病原。采用聚合酶链反应技术进行分子鉴定,扩增EF-1α区域并进行测序。测序,其次是菌丝生长和菌落色素沉着的形态生理方面,允许鉴定一个物种复合体,包括在Botryosphaeriaceae家族。分离物分类为:甘蔗Lasiodiplodia theobromae、金伯利Pseudofusicoccum kimberleyense和Neofusicoccum parum。通过将分离株接种到山核桃幼苗上进行致病性试验,评价其症状。所有菌株都引起茎部溃疡病,但严重程度有所不同。因此,巴西南部地区山核桃发生茎溃疡病的原因是不同种的Botryosphaeriaceae,但其伤害程度不同。因此,鉴定和了解真菌分离株的行为是控制山核桃果园溃疡病的关键。
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引用次数: 2
PIG SLURRY IMPROVES THE PRODUCTIVE PERFORMANCE OF EUCALYPT AND EXCEEDS THE MINERAL FERTILIZATION 猪浆提高了桉树的生产性能,超过了矿物施肥
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2022-01-01 DOI: 10.1590/1806-908820220000024
A. Rosa, Natalia Pereira, F. M. Damaceno, Luiz Antônio Zanão Júnior
ABSTRACT The nutrients contained in the liquid pig slurry (PS) make this residue a potential organic fertilizer for the cultivation of tree species for the production of wood, which can promote the circular economy. This research aimed to evaluate soil chemical parameters, nutritional status, and development of hybrid eucalyptus clone urograndis from PS application for three consecutive years. The treatments evaluated were without fertilization (C); mineral fertilization (NPK) – 300 kg ha-1 year1 of the 02-30-10 formulation; fertigation with PS of 200 m3 ha-1 year1 (FPS200); and fertigation with PS of 400 m3 ha-1 year1 (FPS400). Macronutrients and micronutrients from leaves and soil were evaluated. Tree development was analyzed using stem diameter at breast height (DBH) and total height (Ht). PS treatments resulted in leaves with higher accumulation of K and P and lower accumulation of N, Ca, M, S, Cu, and Fe. The treatments FPS200 and FPS400 presented DBH and Ht equal or superior to the mineral fertilization. Fertilizations with NPK, FPS200, and FPS400 resulted, respectively, in DBH increments 16, 27, and 30% higher than the control. Regarding the chemical attributes of the soil, the use of PS reduced the pH of the soil and increased the levels of P in comparison with the other treatments. The micronutrient values were adequate for fertility and no accumulation of potentially toxic elements at a level considered harmful was observed. The application of PS in eucalyptus hybrid urograndis proved to be an attractive alternative to increase wood production.
摘要猪液浆(PS)中所含的营养物质使其残渣成为一种潜在的有机肥,可用于树种的种植,用于木材生产,促进循环经济。本研究旨在评价连续3年施用PS的大桉杂交无性系土壤化学参数、营养状况及发育状况。评估的处理是不受精(C);矿物肥(NPK) - 02-30-10配方300 kg ha-1年1;200 m3 ha-1年(FPS200)施肥;以400 m3 ha-1年(FPS400)施肥。对叶片和土壤中的宏量元素和微量元素进行了评价。用胸径(DBH)和总高(Ht)分析树木发育情况。PS处理导致叶片K、P积累量增加,N、Ca、M、S、Cu和Fe积累量减少。FPS200和FPS400处理的胸径和Ht均等于或优于矿物施肥处理。施用NPK、FPS200和FPS400后,胸径分别比对照增加了16%、27%和30%。在土壤化学性质方面,与其他处理相比,施用磷肥降低了土壤pH值,提高了磷含量。微量营养素值足以维持生育力,未观察到潜在有毒元素积累达到被认为有害的水平。PS在杂交尤加利上的应用证明是一种有吸引力的提高木材产量的替代方法。
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引用次数: 1
Eucalyptus PLANTATION BENEFITS TO PATCH SIZE AND SHAPE OF FORESTED AREAS IN SOUTHEAST ATLANTIC FOREST 摘要桉树人工林对东南大西洋森林斑块的大小和形状有一定的影响
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2022-01-01 DOI: 10.1590/1806-908820220000026
Gabriela Ribeiro Sapucci, R. Negri, K. Massi, E. Alcântara
ABSTRACT The adoption of mixed plantation systems (exotic and native species) is viable and represents an important alternative in the context of forest and landscape restoration. This study evaluated whether Eucalyptus cultivation is associated with changes in native forest cover and fragment connectivity in the region from 1987 to 2017. The study region (Southeast Atlantic Forest) has been undergoing a forest transition process. Based on land use/land cover maps obtained from satellite images and a pair-wise comparison, it was detected that the dynamics in one land cover were not necessarily associated with the other one. It was verified an increase in Eucalyptus cover since 2007, possibly related to the New Forest Code that allows the use of exotic species in reforestation, provided it does not exceed 50% of the total area. An increase in the native vegetation cover was also observed, highlighting the importance of restoration actions and national regulations. In addition, forest patches were larger and less complex with Eucalyptus presence, indicating that this land cover is potentially beneficial for the landscape connectivity.
采用混合人工林系统(外来和本地物种)是可行的,是森林和景观恢复的重要选择。本研究评估了桉树种植是否与1987年至2017年该地区原始森林覆盖和碎片连通性的变化有关。研究区(东南大西洋森林)正经历着森林转型过程。根据从卫星图像获得的土地利用/土地覆盖图和成对比较,发现一种土地覆盖的动态不一定与另一种土地覆盖相关。经证实,自2007年以来,桉树覆盖面积有所增加,这可能与新森林法规有关,该法规允许在重新造林中使用外来物种,前提是其不超过总面积的50%。还观察到原生植被覆盖的增加,突出了恢复行动和国家条例的重要性。此外,由于桉树的存在,森林斑块面积更大,复杂性更低,表明这种土地覆盖对景观连通性有潜在的好处。
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引用次数: 3
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Revista Arvore
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