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REDUCED-IMPACT LOGGING BY ALLOCATING LOG-DECKS USING MULTI-OBJECTIVE EVOLUTIONARY ALGORITHM IN WESTERN AMAZON 基于多目标进化算法的西亚马孙地区低影响测井分配
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2021-05-28 DOI: 10.1590/1806-908820210000006
Marcos Antonio Isaac Júnior, B. Barbosa, L. R. Gomide, N. Calegário, E. O. Figueiredo, L. O. Moras Filho, E. D. A. Melo, D. Dantas
ABSTRACT To reduce the damage caused by logging in the Amazon rainforest, new metaheuristics have been implemented and tested to ensure the sustainability of this economic segment. Therefore, this study aimed to compare alternatives for road sizing and log deck allocation. In a forest management unit, the skidding to log decks was evaluated in two different areas. To determine the skidding/log deck relation, georeferenced points were generated equally spaced every 50 m. In area 1, the Integer Linear Programming (ILP) model and the Multi-Objective Evolutionary Algorithm (MOEA) were compared. In area 2, only the MOEA was considered. In both areas, these models were also compared to the current planning used in the forest management unit. Solutions were then generated to identify the best management alternative. In both areas, the MOEA showed greater efficiency regarding the processing time, as well as the reduction of log decks number and the road sizing. The multi-objective evolutionary approach assists the decision-making process, due to the presentation of alternatives based on Pareto-optimal solutions, making the choice more flexible and well supported.
为了减少砍伐对亚马逊雨林造成的破坏,新的元启发式方法已经实施和测试,以确保这一经济部门的可持续性。因此,本研究旨在比较道路尺寸和原木甲板分配的替代方案。在一个森林管理单位,在两个不同的地区评估了滑向原木甲板的情况。为了确定滑动/日志甲板关系,每隔50米生成等距的地理参考点。在区域1中,比较了整数线性规划(ILP)模型和多目标进化算法(MOEA)。在区域2中,只考虑了MOEA。在这两个领域,还将这些模式与森林管理单位目前使用的规划进行了比较。然后生成解决方案,以确定最佳的管理方案。在这两个领域,MOEA在处理时间、原木甲板数量和道路尺寸方面都表现出了更高的效率。多目标进化方法有助于决策过程,由于基于帕累托最优解的备选方案的呈现,使选择更加灵活和良好的支持。
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引用次数: 0
RADICULAR BIOMASS AND ORGANIC CARBON OF THE SOIL IN FOREST FORMATIONS IN THE SOUTHERN AMAZONIAN MESOREGION 南亚马逊河流域森林地层土壤根状生物量和有机碳
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2021-01-01 DOI: 10.1590/1806-908820210000037
Ozias Cunha Bello, J. M. Cunha, M. Campos, Elilson Gomes de Brito Filho, M. G. Pereira, Guilherme Cardoso da Silva, Wener Silva Simões, Luís Antônio Coutrim dos Santos
ABSTRACT The soils of the Amazon region, despite being under one of the densest forests in the world, are mostly characterized by the low availability of nutrients, with litter being the main route of nutrient entry. The objective of this study was to quantify the biomass of fine roots in the dry and rainy seasons of the year, including the organic carbon of the soil, and to compare the results in different study environments. The study was carried out in environments of native forest and reforestation aged over 20 years, located in the municipality of Humaitá – AM state. To assess the root biomass, collections were carried out in two periods of the year: dry and rainy seasons. In each of the study areas, five trenches, 0.40 m deep by 0.40 m wide, were dug manually at depths of 0-5, 5-15, and 15-30 cm. For the organic carbon analysis, soil samples were collected in the form of clods at the same depths. The production of root biomass in the native forest environment occurred more intensely in the rainy season, reaching values of 8.19 t. ha-1, greater than 3.57 t. ha-1 found in reforestation. The density as a function of the soil volume showed that the highest concentration is found in the first 5 centimeters of depth, differing significantly in the 5-15 and 15-30 cm layers for native forest area. The organic carbon of the soil showed significance between the dry and rainy seasons for the natural forest environments and reforestation with genipap.
亚马逊地区的土壤,尽管是世界上最茂密的森林之一,但主要特征是养分有效性低,凋落物是养分进入的主要途径。本研究的目的是量化一年中旱季和雨季细根生物量,包括土壤有机碳,并比较不同研究环境下的结果。该研究是在humait - AM州市20多年的原生森林和重新造林环境中进行的。为了评估根系生物量,在一年中的两个时期进行收集:旱季和雨季。在每个研究区,人工挖掘了5条深0.40 m、宽0.40 m的沟,深度分别为0-5、5-15和15-30 cm。为了进行有机碳分析,在相同的深度以土块的形式收集土壤样本。原生森林环境的根系生物量生产在雨季更为强烈,达到8.19 t. ha-1,大于再造林环境的3.57 t. ha-1。土壤密度随土壤体积的变化规律表明,土壤密度在前5 cm土层最高,在5-15 cm和15-30 cm土层差异显著。土壤有机碳在旱季和雨季之间对天然林环境和再植具有显著意义。
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引用次数: 1
INDUCTION AND MAINTENANCE OF EMBRYOGENIC CHARACTERISTICS OF CALLUS OF THE OIL PALM HYBRID MANICORÉ 油棕杂种愈伤组织胚性特征的诱导与维持manicorÉ
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2021-01-01 DOI: 10.1590/1806-908820210000038
M. P. Vilela, J. Andrade, R. S. Santos, V. Stein, P. C. M. S. Alves, L. V. Paiva
ABSTRACT Large-scale oil palm propagation (Elaeis guineensis Jacq.) is difficult due to its unique apical meristem. In this context, micropropagation allows the multiplication of seedlings in vitro and the storage of germplasm elites. This study aimed to induce embryogenic calluses from leaves of oil palm plants in low concentrations of auxins and to observe the maintenance of these characteristics during in vitro cultivation. Calluses were induced in 0.5 cm leaf explants in Y3 culture medium supplemented with Picloram (4-Amino-3,5,6-trichloro-2-pyridinecarboxylic acid) or 2,4-D (2,4-dichlorophenoxyacetic acid), at concentrations of 0, 1, 3, 6, and 9 mg L-1. The callus with embryogenic appearance was subcultured and evaluated regarding maintenance of embryogenic characteristics by cytochemical analyses. The best treatment for induction of calluses was composed of 1mg.L-1 of Picloram, which led to 30% callus formation. The calluses were classified into4 types, based on color and morphology. The cells of calluses with nodular and beige appearance have embryogenic characteristics, and the embryogenic potential of the cell masses was maintained over the 20 months of cultivation. This differentiated adaptation to the protocol can allow the advance in the mass propagation of oil palm through tissue culture, indicating the importance of investigating the topics proposed by the research.
油棕(Elaeis guineensis Jacq.)由于其独特的根尖分生组织,给大规模繁殖带来了困难。在这种情况下,微繁殖允许离体苗的繁殖和种质精英的储存。本研究旨在通过低浓度生长素诱导油棕叶片发生胚性愈伤组织,并观察其在离体培养过程中这些特性的维持情况。在Y3培养基中分别添加Picloram(4-氨基-3,5,6-三氯-2-吡啶羧酸)或2,4-d(2,4-二氯苯氧乙酸),浓度分别为0、1、3、6和9 mg L-1, 0.5 cm叶片外植体诱导出愈伤组织。对具有胚性外观的愈伤组织进行传代培养,并通过细胞化学分析评价其胚性特征的维持情况。诱导愈伤组织的最佳处理剂量为1mg。L-1,导致30%的愈伤组织形成。根据颜色和形态将愈伤组织分为4种类型。外观呈结节状、米黄色的愈伤组织细胞具有胚性特征,培养20个月后细胞团的胚性保持不变。这种对协议的差异化适应可以通过组织培养在油棕的大规模繁殖中取得进展,这表明了调查该研究提出的主题的重要性。
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引用次数: 0
GERMINATIVE PERFORMANCE OF MULUNGÚ SEEDS (Ormosia grossa Rudd) AFTER DORMANCY OVERCOMING MULUNGÚ种子克服休眠后的发芽性能
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2021-01-01 DOI: 10.1590/1806-908820210000032
R. D. Pinheiro, Vanessa Nogueira Soares, G. I. Gadotti, E. D. D. Silva, A. Almeida
ABSTRACT Ormosia grossa Rudd is an Amazonian species that presents bicolor seeds, allowing its exploration for handicraft and decoration making. This paper aimed to analyze the influence of different methods to overcome dormancy on the germinative performance of Ormosia grossa seeds. To conduct the experiment, the following treatments were established: T1= scarification with 80-grit sandpaper and water immersion at room temperature for 24 hours; T2= puncturing and water immersion at room temperature for 24 hours; T3= scarification with 80-grit sandpaper; T4= puncturing; T5= immersion in water heated to 80 ºC for five minutes, and T6= Control - seeds without any treatment. The seeds germinate slowly and irregularly. Depending on the treatment, germination started between 10 and 32 days and, if there is no adequate pre-germinative treatment to overcome dormancy, it can exceed such time. The phytomass performance and seedling lengths were superior in the T1 and T2 treatments. The scarification by abrasiveness and puncturing treatments are efficient to overcome dormancy, thus increasing the speed (3.76 and 3.12) and germination percentage (98% and 96%) after ten days. The control was 0.01 (IVG), and germination of 37%. Therefore, it is recommended the method of scarification with sandpaper followed by seed imbibition in water at room temperature for 24 hours, as it provides the best seedling performance and germination.
红豆(Ormosia grossa Rudd)是亚马逊地区的一种植物,种子呈双色,可用于手工艺和装饰制作。本文旨在分析不同的克服休眠方法对红豆种子发芽性能的影响。为进行试验,确定了以下处理:T1=用80粒砂纸刻痕,室温水浸泡24小时;T2=穿刺,室温水浸泡24小时;T3= 80粒砂纸刻痕;T4 =刺穿;T5=在加热至80ºC的水中浸泡5分钟,T6=对照组-未经任何处理的种子。种子发芽缓慢而不规则。根据处理的不同,萌发开始于10至32天之间,如果没有充分的发芽前处理来克服休眠,萌发可能会超过这个时间。T1和T2处理的植株质量性能和幼苗长度均较好。磨蚀和穿刺处理均能有效克服休眠,10 d后种子萌发速度提高3.76%和3.12%,发芽率提高98%和96%。对照为0.01 (IVG),发芽率为37%。因此,建议先用砂纸刻蚀,然后在室温下浸泡24h,以获得最佳的出苗性能和发芽率。
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引用次数: 3
INFLUENCE OF COMMERCIAL THERMAL TREATMENT ON Eucalyptus grandis Hill ex Maiden WOOD PROPERTIES 商业热处理对巨桉木材特性的影响
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2021-01-01 DOI: 10.1590/1806-908820210000027
C. Oliveira, K. A. D. Oliveira, J. C. Molina, V. Aquino, A. Christoforo
ABSTRACT This study aimed to evaluate the influence of commercial thermal treatment on Eucalyptus grandis considering its physical, chemical, and mechanical properties. The wood samples were heat-treated in an autoclave with saturated steam and pressure application at four different temperatures: 155, 165, 175, and 185 ºC. The physical, chemical, and mechanical properties were altered due to the heat treatment. The extractives content varied between 6.06% and 28.75%; lignin between 28.93% and 37.96%; holocellulose between 65.01% and 38.12%. The mechanical properties reduced significantly with the increase of the heat treatment temperature. Through the set of data obtained, it was possible to generate significant and high precision regression models capable of estimating such properties for heat treatment temperatures not studied experimentally, enabling the determination of the most suitable temperature of heat treatment to achieve a certain property value of the treated wood.
摘要:本研究旨在评价商业热处理对巨桉物理、化学和机械性能的影响。木材样品在高压灭菌器中以饱和蒸汽和压力在四种不同的温度下进行热处理:155、165、175和185℃。由于热处理,物理、化学和机械性能都发生了变化。提取物含量在6.06% ~ 28.75%之间;木质素在28.93% ~ 37.96%之间;全纤维素含量在65.01%到38.12%之间。随着热处理温度的升高,合金的力学性能显著降低。通过所获得的一组数据,可以生成有意义且高精度的回归模型,能够对实验未研究的热处理温度进行此类性能的估计,从而确定最合适的热处理温度,以实现被处理木材的某一性能值。
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引用次数: 0
FOREST ANALYSIS IN THE LANDSCAPE CONTEXT AT SÃO BARTOLOMEU RIVER BASIN, VIÇOSA-MG sÃo bartolomeu河流域景观背景下的森林分析,viÇosa-mg
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2021-01-01 DOI: 10.1590/1806-908820210000033
Joana Angélica Cavalcanti Pinheiro, E. I. Fernandes-Filho, L. Gomes, V. P. Soares, T. S. Sarcinelli
ABSTRACT The reduction of forest areas in recent years has influenced landscape fragmentation, compromising ecosystem functions. The natural forest, in addition to maintaining biodiversity, is capable of improving the hydrological conditions of the watershed. This study aimed to characterize the landscape structure of the remaining forest fragments in the São Bartolomeu river basin, at the Zona da Mata of Minas Gerais State, and to assess their physiographic and pedological representativeness. The study area is responsible for most of Viçosa’s water supply, while it is undergoing an urbanization process, reinforcing the need for ordering the use, besides the evaluation of priority areas for conservation. The studies related to the landscape structure were based on the metrics of forest fragments. The representativeness was analyzed regarding the aspects of topographic compartmentation, slope faces, and soils, using the Chi-square test. The natural forest presents fragments varying from medium to large size, with satisfactory proximity between them. However, the forest patches have irregular shapes, favoring the edge effect with a tendency towards irregularity as the fragment size increases. The results of the physiographic and pedological representativeness indicate that the land uses are dependent on the location in the landscape. According to the statistical test, the forest occurs less frequently than expected on the river terraces (48.3%) and convex slopes (2.3%), as well as on the Red-Yellow Acrisols (53.1%), and on the north (28.5%) and west (20.9%) faces. For urban planning and biodiversity conservation purposes, it is recommended to balance the forest area in the different compartments of the landscape, giving priority to the connection of forest fragments.
近年来森林面积的减少影响了景观破碎化,损害了生态系统功能。天然林除了维持生物多样性外,还能改善流域的水文条件。本研究旨在描述米纳斯吉拉斯州Zona da Mata的s o Bartolomeu河流域剩余森林碎片的景观结构,并评估其地理和土壤学代表性。研究区域负责viosa的大部分供水,而它正在经历城市化进程,除了评估优先保护区域外,还加强了订购使用的必要性。与景观结构相关的研究是基于森林破碎片的度量。采用卡方检验对地形分区、坡面和土壤的代表性进行了分析。天然林呈现大小不等的碎片,碎片之间的接近程度令人满意。然而,森林斑块形状不规则,有利于边缘效应,并随着碎片大小的增加而趋于不规则。地形学和土壤学的代表性结果表明,土地利用依赖于景观中的位置。经统计检验,河流阶地(48.3%)、凸坡(2.3%)、红黄山岗(53.1%)、北坡面(28.5%)和西坡面(20.9%)的森林出现频率低于预期。为了城市规划和生物多样性保护的目的,建议在景观的不同分区中平衡森林面积,优先考虑森林碎片的连接。
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引用次数: 1
TECHNOLOGICAL PARAMETERS OF SEEDS APPLIED TO THE SELECTION OF SUPERIOR MOTHER TREES FROM Ormosia discolor SPRUCE EX BENTH 种子技术参数在红唇云杉优良母树选择中的应用
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2021-01-01 DOI: 10.1590/1806-908820210000036
Helinara Lais Vieira Capucho, Manuel de Jesus Vieira Lima Júnior, A. Mendes, M. T. G. Lopes, Amazoneida Sá Peixoto Pinheiro, Laerte Nogueira da Silva
ABSTRACT The study on the native species of fast growth and nodulation capacity, Ormosia discolor, intends to conserve genetic resources and make available seed lots of high vigor for seed orchards. This work evaluates the physical and physiological characteristics of seeds from 20 O. discolor trees as a subsidy for selecting superior mother trees. Twenty matrices selected from a population in the state of Amazonas were inventoried. Physical tests were performed on the seeds collected, including water content, biometrics, the weight of one thousand seeds, and coat permeability test. For vigor estimates and classification regarding seed storage, the seeds were frozen for five months. The germination test was carried out at a constant temperature of 30 °C. It was used a completely randomized design consisting of 20 mother trees, 4 replicates, and 25 seeds per plot. The germination characteristics evaluated were germination percentage, speed index, mean germination time, and synchronization index. Cut seeds are more efficient for determining water content. All biometric variables are representative for the selection of vigorous lots, with emphasis on geometric diameter, surface area, and sphericity of seeds. Species seeds were classified as orthodox and as having physical dormancy. The protrusion of the primary root is the best morphological characteristic for evaluating germination in the laboratory. The mother trees 7, 16, and 10 showed superior characteristics for dendrometric and technological data, being indicated for marking, phenological monitoring, and planting.
摘要对生长快、结瘤能力强的土生植物赤藓(Ormosia discolor)进行研究,旨在节约遗传资源,为种子园提供大量高产种子。本研究对20株黄绿树种子的生理特性进行了评价,为选择优质母树提供依据。从亚马逊州的一个人群中选择了20个矩阵进行了调查。对采集的种子进行物理测试,包括含水量、生物特征、千粒重、被皮渗透性测试。为了进行活力评估和种子储存分类,种子冷冻5个月。发芽试验在30℃恒温条件下进行。试验采用完全随机设计,母树20株,4个重复,每小区25粒种子。发芽特性评价为发芽率、速度指数、平均发芽时间和同步指数。切分的种子对测定含水量更有效。所有的生物特征变量都具有代表性,以种子的几何直径、表面积和球形度为重点。物种种子分为正统种子和具有物理休眠的种子。在实验室中,初生根的突出是评价发芽的最佳形态特征。7号、16号和10号母树在树形学和技术数据上均表现出优良的特征,可用于标记、物候监测和种植。
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引用次数: 0
POPULATION DYNAMICS OF Hypothenemus hampei (Coleoptera: Scolytidae) IN AGROFORESTRY AND MONOCULTURE SYSTEMS OF CONILON COFFEE IN THE SOUTHERN PORTION OF THE STATE OF AMAZONAS, BRAZIL 巴西亚马孙州南部康尼隆咖啡农林业和单一栽培系统中hampei的种群动态(鞘翅目:鞘翅科)
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2021-01-01 DOI: 10.1590/1806-908820210000024
Juliana Formiga Botelho, Ruan Sobreira de Queiroz, M. R. Anjos, M. Souza
ABSTRACT Hypothenemus hampei is the main coffee pest in the Amazon and worldwide. Although coffee cultivation exists in the State of Amazonas, there is no information regarding the behavior of this species population in this region of Brazil. Since the Amazon region is a favorable environment for H. hampei, the present study aimed to investigate this insect population in the following cultivation systems implanted in the municipality of Humaitá, Southern Amazonas: i) coffee in native forest (CNF), ii) coffee intercropped with cupuaçu and açaí (native Brazilian fruits) (CCA) and iii) coffee in monoculture (MC). Also, the climatic and phenological parameters of the plant were used in relation with the population dynamics of the insect. For that, ten baited traps were installed in each field for the monthly sampling of the H. hampei population from July/2018 to June/2019. The highest population abundance of the insect was observed during the coffee flowering season, mainly in monoculture crops, when compared to the other intercropped fields. The total mean value of the insect population observed in the three environments evaluated was highest in August/2018, with a recorded value of 1749. The increase in rainfall indexes occurred simultaneously with a decrease in the insect population; this coincides with the end of the flowering season (October/2018, 161.8 mm) and the beginning of grain formation (November/2018, 234.8 mm). The lowest abundance of the insect observed in the coffee fields in native forest, with an abundance of 83 (CNF), indicates that the local biodiversity disfavors the population size of the pest in the environment. These results suggest that phenological phases of conilon coffee and the influence of climatic conditions can result in changes in the population dynamics of the H. hampei. Coffee agroforestry systems are more promising to maintain this population at low levels.
摘要hampei是亚马逊河流域乃至世界范围内的主要咖啡害虫。虽然亚马逊州存在咖啡种植,但没有关于巴西该地区该物种种群行为的信息。由于亚马逊地区是hampei的有利环境,本研究旨在调查在亚马逊南部humait市种植的以下种植系统中的hampei种群:i)原生林咖啡(CNF), ii)咖啡间作cupuau和açaí(巴西本土水果)(CCA)和iii)单一栽培咖啡(MC)。此外,还利用植物的气候和物候参数与昆虫种群动态的关系。为此,从2018年7月至2019年6月,在每个领域安装了10个诱捕器,每月对hampei种群进行抽样。与其他间作田相比,在咖啡花期,主要是在单作作物中,观察到昆虫种群丰度最高。2018年8月3个评价环境中观察到的昆虫总数均值最高,为1749只。降雨指数的增加与昆虫数量的减少同时发生;这与花期结束(2018年10月,161.8毫米)和籽粒形成开始(2018年11月,234.8毫米)相吻合。在原生林的咖啡田中,该害虫的丰度最低,为83 (CNF),表明当地的生物多样性不利于该害虫在环境中的种群规模。这些结果表明,康尼隆咖啡的物候阶段和气候条件的影响可能导致汉贝咖啡种群动态的变化。咖啡农林复合系统更有希望将这种种群维持在低水平。
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引用次数: 1
STUDY OF THE INFLUENCE OF WOOD PROPERTIES ON THE CHARCOAL PRODUCTION: APPLYING THE RANDOM FOREST ALGORITHM 木材性质对木炭产量影响的研究:应用随机森林算法
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2021-01-01 DOI: 10.1590/1806-908820210000002
Kaléo Dias Pereira, A. P. S. Carneiro, G. Santos, A. Carneiro, H. Leite, Felipe Pedersoli Borges
ABSTRACT The understanding of the relationship between the properties of wood and charcoal makes it possible to improve the production of charcoal. Therefore, the random forest algorithm was used in this study to analyze the influence of eucalyptus wood properties on the quality of charcoal as well as the accuracy of the predicted values concerning the results estimated by support vector regression and multiple linear regression. Six properties of wood and six properties of charcoal obtained from the hybrid Eucalyptus grandis x Eucalyptus urophylla and from twelve clones of Corymbia torelliana x Corymbia critriodora at the age of seven were measured. In the analysis, the measure of mean decrease in node impurity (residual sum of squares) calculated with the random forest and the copula correlation was used to evaluate the relationship between properties of wood and charcoal. The random forest was compared to the support vector regression and multiple linear regression through the coefficient of determination, linear correlation between observed and predicted values, mean absolute error and root mean squared error. The accuracy of the random forest was greater than that obtained with the support vector regression and multiple linear regression, mainly in terms of the coefficient of determination and the linear correlation between observed and predicted values. The yield and quality of the charcoal produced from clones were mainly influenced by the holocellulose content, heartwood/sapwood ratio, and basic wood density. The apparent relative density of charcoal was the variable in which the random forest algorithm reached the best level of explanation of the variability as a function of the properties of wood, while the minor error was observed for the fixed carbon content.
摘要:了解木材和木炭性质之间的关系,可以改善木炭的生产。因此,本研究采用随机森林算法分析桉树木材性质对木炭质量的影响,以及通过支持向量回归和多元线性回归估计结果的预测值的准确性。测定了大桉与尾叶桉杂交种和12个7岁时的山茱萸与凤梨山茱萸无性系的6项木材性能和6项木炭性能。在分析中,使用随机森林和copula相关计算的节点杂质平均减少量(残差平方和)来评估木材和木炭性质之间的关系。通过决定系数、观测值与预测值的线性相关性、平均绝对误差和均方根误差,将随机森林与支持向量回归和多元线性回归进行比较。随机森林的精度高于支持向量回归和多元线性回归,主要表现在决定系数和观测值与预测值之间的线性相关。无性系炭的产量和质量主要受总纤维素含量、心材/边材比和基本材密度的影响。木炭的表观相对密度是随机森林算法在解释木材特性的变异性方面达到最佳水平的变量,而固定碳含量的误差较小。
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引用次数: 2
TREE DAMAGE AND MISTLETOE IMPACT ON URBAN GREEN AREAS 树木损害和槲寄生对城市绿地的影响
IF 0.5 4区 农林科学 Q4 FORESTRY Pub Date : 2021-01-01 DOI: 10.1590/1806-908820210000030
Dionicio Alvarado-Rosales, L. D. L. Saavedra-Romero
ABSTRACT Green areas in cities provide several benefits to people, however, several biotic and abiotic agents affects the tree’s health. The main goals of this research were to identify tree damages and to assess the impact of mistletoe on dendrometric variables and the crown condition. Four thousand, seven hundred seventy-five trees were evaluated in 16 green areas of eight Mayoralties in Mexico City; each tree was labeled, and total tree height (Th), diameter at breast height (DBH), damage agents (up to three types), and the crown variables: Live crown ratio (Lcr), Crown dieback (Cdie), Mistletoe severity (Ms) and Crown position (Cpo) were recorded. Of the assessed trees, 3318 presented damage. For the type of damage 1, the mistletoes Cladocolea and Struthanthus showed an average incidence of 42%. For type 2, 20 agents and type 3, 11 were identified. Mechanical wounds, sucking insects, vandalism, and cankers were the most common damages. Based on the Principal Component Analysis (PCA), trees of all diameters and heights were infected, however, Struthanthus was associated with taller and larger diameter trees. Lcr was lower, and Cdie and Ms were higher in infected trees. About Cpo, dominant and codominant trees showed the highest levels of severity by mistletoe. The most affected tree genera were Ulmus and Populus (low Lcr and high Cdie and Ms). Cladocolea was found toward southern Mayoralties, and Struthanthus at the north. It is recommended to assess at least two types of damage on each tree, as this will provide a more complete picture of its health. This is the first study in Mexico on the impact of mistletoe on tree crown variables
城市绿地为人们提供了许多好处,然而,一些生物和非生物因素影响着树木的健康。本研究的主要目的是鉴定槲寄生对树木的损害,并评估槲寄生对树木密度变量和树冠状况的影响。在墨西哥城8个市长辖区的16个绿地中评估了4,775棵树;对每棵树进行标记,记录总树高(Th)、胸径(DBH)、损伤因子(多达三种类型)和树冠变量:活冠比(Lcr)、树冠枯梢(Cdie)、槲寄生严重程度(Ms)和树冠位置(Cpo)。在评估的树木中,有3318棵树受损。对危害类型1而言,槲寄生和槲寄生的平均发生率为42%。2型共鉴定出20种,3型鉴定出11种。机械损伤、昆虫叮咬、人为破坏和溃烂是最常见的损伤。主成分分析(PCA)结果表明,所有直径和高度的树木都有感染,但以较高和较大直径的树木为主。Lcr较低,Cdie和Ms较高。在Cpo方面,优势树和共优势树以槲寄生的严重程度最高。受影响最大的树种是榆木和杨木(低Lcr,高Cdie和Ms)。克拉多科利亚在马约勒斯的南部,斯特鲁桑托斯在北部。建议对每棵树至少评估两种类型的损害,因为这将提供一个更完整的健康图景。这是墨西哥首次研究槲寄生对树冠变量的影响
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引用次数: 1
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Revista Arvore
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