Ocorrência e danos de térmitas na madeira de Acacia mearnsii (Fabaceae) em dois campos de apodrecimento (Nota Científica).

Silveira, Amanda Grassmann da; Santini, Élio José; Trevisan, Rômulo; Cancian, Luciano Campos; Mariano, Lilian Gonçalves

doi:10.4322/rif.2015.015

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…The conditions of the forest, especially in relation to the ground, favor the development of microorganism decomposers. The values of total porosity (0.53 cm -3 ) and bulk density (1.2 g cm -3 ) allow the soil to remain with high levels of humidity, which enables the development of microorganisms even in periods of drought (SILVEIRA et al, 2015). The organic matter content present in the soil (3.3%) is considerable and also provides better conditions for the development of organism decomposers (CARVALHO et al, 2016).…”

Section: Weight Lossmentioning

confidence: 99%

QUALITY OF Hovenia dulcis Thunb. ROUND FENCE POSTS SUBMITTED TO PRESERVATIVE TREATMENT

Silveira¹,

Baldin

Vidrano

et al. 2018

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This study aimed to test the hypothesis regarding the quality of Hovenia dulcis fence posts, which states that it varies according to the treatment period when subjected to the sap displacement method.. The experiment began with 15 round fence posts distributed vertically in tank containing copper sulfate, sodium dichromate and boric acid (CCB) solution at 2.5% concentration. In order to verify the influence of time on the efficiency of the method, the posts stayed in the preservative solution for periods of 3, 6, 9, 12 and 15 days, which were assessed. Penetration and retention in three positions were analyzed, which corresponded to the regions of base, middle and top parts. With regards to treated wood, samples of each piece were prepared for testing in field test. Then, weight loss and bending properties were assessed. According to the results of penetration and retention, wood treated on the period of 15 days is the only one that can be used directly with the soil. After assessment of the weight loss, the periods of 12 and 15 days of treatment increased the classification of wood from moderately to strong resistant. The bending test showed significant reduction in rigidity and strength of the material, even in the treated ones, which demonstrates that the forest environment in which samples were exposed promoted the process of wood decomposition.

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Section: Weight Lossmentioning

confidence: 99%

QUALITY OF Hovenia dulcis Thunb. ROUND FENCE POSTS SUBMITTED TO PRESERVATIVE TREATMENT

Silveira¹,

Baldin

Vidrano

et al. 2018

Self Cite

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“…These organisms have an ecological role in forest ecosystems [18]. These organisms live in colonies and are xylophagous, having cellulose as their main food [11,19]. Termites are also of high economic importance because they infest the plants in both nursery and young plantations, feeding on tree bark and roots.…”

Section: Introductionmentioning

confidence: 99%

“…Termites are also of high economic importance because they infest the plants in both nursery and young plantations, feeding on tree bark and roots. Through their eating habits, they directly damage the root system of the trees, create tunnels in the core of the trunks, and the damage can affect 50-100% of the tree [12,19,20]. Most termites are polyphagous, and as such, able to feed on several tree species from different families, meaning potential risk to attack native miombo tree species as well as Eucalyptus.…”

Section: Introductionmentioning

confidence: 99%

Termites Distribution and Diversity in Different Land Uses in Mozambique: Implications for Management

Jose¹,

Sergio²,

Belincia³

et al. 2022

AJAF

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Termites play an important ecological role in ecosystems, mainly as decomposers. However, some species under certain conditions may become pests, causing damage in forests and cultivated fields. Termites are associated with native forests, forest plantations and croplands. Despite this, information regarding taxonomy, management, economic and ecological termite impacts for these land uses categories is not widely known. This study aimed to assess termite's distribution, incidence, damage, diversity, and affinity in different land use categories. In circular 0.28ha plots in native vegetation and croplands and 1ha rectangular plots in forest plantations, termites capture was performed and, tree infestation assessed by visual inspection. Plot allocation was random-stratified by land use category. Twenty-one termite species, from nine genera and two families (Termitidae and Rhinotermitidae) were found. Of these species, fourteen, thirteen, ten and nine were respectively associated with miombo woodlands, fallow, cultivated areas and forest plantations, suggesting that species richness decreases with increasing habitat disturbance. Termite incidence is highest in plantation forests, followed by native woodlands, fallow and croplands. In forests, fallow areas, and croplands, damage severity was low, while in forest plantations it ranged from low to moderate. These results suggest that in miombo woodlands, fallow areas, and croplands, termite incidence does not necessarily imply economic damage. Economic losses in Eucalyptus plantations reach up to US$ 542.13/ha, reducing with increased plantation age, reaching 1.77 m 3 /ha in plantations two years old or less, and 0.73 m 3 /ha in 6-year age plantations. Efforts to combat termites are needed at early plantation stages.

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CARACTERIZAÇÃO DE PROPRIEDADES TECNOLÓGICAS DE QUATRO FOLHOSAS DETERIORADAS POR TÉRMITAS DO GÊNERO Nasutitermes

Gallio

Machado

Silva

et al. 2018

NAT

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O objetivo deste trabalho consistiu em analisar a deterioração causada por térmitas em madeiras de Mezilaurus itauba (Meisn.) Taub. ex Mez, Cordia americana (L.) Gottshling & J. E. Mill., Melia azedarach L. e Parapiptadenia rigida (Benth.) Brenan, após ensaio de preferência alimentar. Foram confeccionados 20 corpos de prova de cada espécie, com dimensões de 15 x 15 x 260 mm (tangencial x radial x longitudinal). Os parâmetros tecnológicos avaliados foram a massa específica básica (ρb), a perda de massa (PM), o módulo de elasticidade (MOE) e ruptura (MOR) provenientes do ensaio de flexão estática e a dureza. Finalizado o ensaio, a espécie com menor perda de massa foi a Melia azedarach, possivelmente devido à composição dos seus extrativos. Para as espécies Cordia americana e Parapiptadenia rigida, quanto às propriedades mecânicas, verificou-se redução significativa somente no MOE das amostras deterioradas em comparação com as do grupo controle. Conclui-se, portanto, que, a maior resistência da espécie Melia azedarach está associada à sua composição química, sendo que em quase todas as espécies madeireiras houve decréscimo nos parâmetros mecânicos (MOE, MOR e dureza Janka) devido ao ataque dos térmitas Nasutitermes.Palavras-chave: biodeterioração, cupins, propriedades tecnológicas, espécies florestais. TECHNOLOGICAL PROPERTIES CHARACTERIZATION OF FOUR HARDWOODS DETERIORATED BY GENDER Nasutitermes TERMITES ABSTRACT:The objective of this work was to analyze the deterioration caused by termites in woods of Mezilaurus itauba (Meisn.) Taub. ex Mez, Cordia americana (L.) Gottshling & J. E. Mill., Melia azedarach L. and Parapiptadenia rigida (Benth.) Brenan, after food preference assay. Were made 20 test specimens of each species, with dimensions of 15 x 15 x 260 mm (tangential x radial x longitudinal). The physical parameters were the basic mass (ρb), the mass loss (PM), the modulus of elasticity (MOE) and rupture (MOR) from the static bending test and Janka hardness. After the test, the species with the lowest mass loss was Melia azedarach, possibly due to your extractives composition. For the species Cordia americana and Parapiptadenia rigida, about the mechanical properties, it was observed significant reduction only in the MOE of deteriorated samples compared to the control group. It's concluded that the Melia azedarach specie higher resistance it’s associated with your chemical composition, and in almost all wood species there was a decrease in mechanical parameters (MOE, MOR and Janka hardness) due to attack of Nasutitermes termites.Keywords: biodeterioration, termites, technological properties, forest species.

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Ocorrência e danos de térmitas na madeira de Acacia mearnsii (Fabaceae) em dois campos de apodrecimento (Nota Científica).

Cited by 3 publications

References 2 publications

QUALITY OF Hovenia dulcis Thunb. ROUND FENCE POSTS SUBMITTED TO PRESERVATIVE TREATMENT

QUALITY OF Hovenia dulcis Thunb. ROUND FENCE POSTS SUBMITTED TO PRESERVATIVE TREATMENT

Termites Distribution and Diversity in Different Land Uses in Mozambique: Implications for Management

CARACTERIZAÇÃO DE PROPRIEDADES TECNOLÓGICAS DE QUATRO FOLHOSAS DETERIORADAS POR TÉRMITAS DO GÊNERO Nasutitermes

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