Growth, biomass and nutrient stock in mixed-species planting of hybrid Eucalyptus urograndis and Acacia mearnsii in Southern Brazil

Ludvichak, Aline Aparecida; Schumacher, Mauro Valdir; Viera, Márcio; Santos, Kristiana Fiorentin dos; Momolli, Dione Richer

doi:10.1007/s11056-021-09852-3

Cited by 7 publications

(4 citation statements)

References 37 publications

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“…In the present study, the average proportion of the wood component was 75.4% and the average proportion of leaves was 7.3%; by contrast, the authors of [31] evaluated the biomass production in E. grandis × E. urophylla trees at 9 years of age and found a total biomass of 170.6 Mg ha −1 , of which 2.8, 5.7, 16.7, and 145.5 Mg ha −1 were accounted for by the leaf, branch, stembark, and stemwood components, representing 1.6, 3.3, 9.8, and 85.2%, respectively. The authors of [32] studied biomass production and found contributions of 89.3, 6.2, 3.2, and 1.2% for the stemwood, stembark, branches, and leaves, respectively.…”

Section: Forest Biomasscontrasting

confidence: 91%

“…In general, the leaf component had the highest concentration of nutrients, and the wood component had the lowest. This same behavior, with a higher concentration of nutrients in the leaves, was found by the authors of [30] in different genotypes and species of 4.5-year-old stands in Alegrete, southern Brazil; by the authors of [35] in stands of different genotypes in São Gabriel, southern Brazil; and by the authors of [31] when evaluating pure and mixed stands of E. grandis × E. urophylla and A. mearnsii trees of 9 years of age in southern Brazil. According to [36], the concentration gradient is as follows: leaves > stembark > branches > stemwood.…”

Section: Nutrient Concentrationsupporting

confidence: 79%

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Weed Coexistence in Eucalyptus Hybrid Stands Decreases Biomass and Nutritional Efficiency Mid-Rotation

Momolli,

Schumacher,

Ludvichak

et al. 2023

Forests

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Determining the period of weed coexistence with eucalyptus stands assists in the integrated management of weed competition, which reduces the application of herbicides, economic costs, and environmental damage. Therefore, the objectives of the present study were to evaluate the impact of a hybrid stand of Eucalyptus grandis × Eucalyptus urophylla trees on biomass production, the concentration and stock of macro and micronutrients, and the efficiency of nutrient utilization under different periods of coexistence with weeds. Our study is the first to report the impacts of weed management on the biomass and nutrients present in the leaves, branches, stembark, and stemwood at the time of mid-rotation (4.5 years old). The experiment was carried out in southern Brazil in the Pampa biome and followed a randomized block design, with three replications. The treatments consisted of increasing periods of coexistence with or control of weeds. The total biomass in the coexistence up to 378 days treatment was 53.7 Mg ha−1, and in the control treatment up to 168 days, it was 81.4 Mg ha−1, differing statistically. This reduction was in the order of 34%. The continuous presence of weeds led to a significant reduction in the production of wood and total biomass. The highest nutrient utilization efficiency (NUE) was observed for wood. The control of weeds for up to 168 days promoted greater productivity than controlling weeds for 378 days. This recommendation can be adopted by plantation managers for this region, reducing the amount of herbicide applied on the stand.

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Section: Forest Biomasscontrasting

confidence: 91%

Section: Nutrient Concentrationsupporting

confidence: 79%

Weed Coexistence in Eucalyptus Hybrid Stands Decreases Biomass and Nutritional Efficiency Mid-Rotation

Momolli,

Schumacher,

Ludvichak

et al. 2023

Forests

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“…For earthworm and springtail, the EEC was the maximum leaf concentrations in their diet: 53.76 μg/g for Cry1Ab, 8.33 μg/g for Cry1Bb, and 9.73 μg/g for Cry2Aa. For D. magna , we utilized an estimate of the eucalyptus biomass from Ludvichak et al (2022) as a highly conservative scenario. This approach aligns with the pond model based on maize ( Carstens et al, 2012 ).…”

Section: Resultsmentioning

confidence: 99%

“…To conservatively estimate the EEC for D. magna , a model was used that assumed the living tissue biomass from 10 ha of transgenic eucalyptus drains into a 20,000-cubic meter pond ( Carstens et al, 2012 ). The amount of the living tissue biomass per hectare of eucalyptus was set to 25,200 kg based on published data ( Ludvichak et al, 2022 ). The EEC was calculated by taking 10 ha of the biomass at 25,200 kg/ha, multiplying it by the maximum measured concentration of each protein in the tissues of the event 1521K059, and dividing it by the 20 million-liter pond volume.…”

Section: Methodsmentioning

confidence: 99%

Genetically engineered eucalyptus expressing pesticidal proteins from Bacillus thuringiensis for insect resistance: a risk assessment evaluation perspective

Avisar,

Manoeli,

dos Santos

et al. 2024

Front. Bioeng. Biotechnol.

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Eucalyptus covers approximately 7.5 million hectares in Brazil and serves as the primary woody species cultivated for commercial purposes. However, native insects and invasive pests pose a significant threat to eucalyptus trees, resulting in substantial economic losses and reduced forest productivity. One of the primary lepidopteran pests affecting eucalyptus is Thyrinteina arnobia (Stoll, 1782) (Lepidoptera: Geometridae), commonly referred to as the brown looper caterpillar. To address this issue, FuturaGene, the biotech division of Suzano S.A., has developed an insect-resistant (IR) eucalyptus variety, which expresses Cry pesticidal proteins (Cry1Ab, Cry1Bb, and Cry2Aa), derived from Bacillus thuringiensis (Bt). Following extensive safety assessments, including field trials across various biomes in Brazil, the Brazilian National Technical Commission of Biosafety (CTNBio) recently approved the commercialization of IR eucalyptus. The biosafety assessments involved the analysis of molecular genomics, digestibility, thermostability, non-target organism exposure, degradability in the field, and effects on soil microbial communities and arthropod communities. In addition, in silico studies were conducted to evaluate allergenicity and toxicity. Results from both laboratory and field studies indicated that Bt eucalyptus is as safe as the conventional eucalyptus clone for humans, animals, and the environment, ensuring the secure use of this insect-resistant trait in wood production.

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Soil nutrient dynamics, harvest residue management and soil organic matter conservation for the sustainability of black wattle production systems in subtropical soils: a review

de São José,

du Toit,

Volpiano

et al. 2023

New Forests

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Growth, biomass and nutrient stock in mixed-species planting of hybrid Eucalyptus urograndis and Acacia mearnsii in Southern Brazil

Cited by 7 publications

References 37 publications

Weed Coexistence in Eucalyptus Hybrid Stands Decreases Biomass and Nutritional Efficiency Mid-Rotation

Weed Coexistence in Eucalyptus Hybrid Stands Decreases Biomass and Nutritional Efficiency Mid-Rotation

Genetically engineered eucalyptus expressing pesticidal proteins from Bacillus thuringiensis for insect resistance: a risk assessment evaluation perspective

Soil nutrient dynamics, harvest residue management and soil organic matter conservation for the sustainability of black wattle production systems in subtropical soils: a review

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