Invasion of<i>Acacia mangium</i>in Amazonian savannas following planting for forestry

Aguiar, Agnaldo; Barbosa, Reinaldo Imbrózio; Barbosa, José Beethoven Figueiredo; Mourão, Moisés

doi:10.1080/17550874.2013.771714

Cited by 48 publications

(34 citation statements)

References 61 publications

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“…It must be recognized, however, that this subject has not yet been fully investigated, and a detailed scientific study would be needed to confirm the dispersal capacities of A. mangium propagules [31]. Those authors identified individuals that had dispersed into natural savanna ecosystems located more than 900 m from commercial plantations [31]. According to local informants, invasive acacias can be readily found in buriti palm stands, near wells, along river banks, and in new and abandoned farm plots.…”

Section: Discussionmentioning

confidence: 99%

Local ecological knowledge concerning the invasion of Amerindian lands in the northern Brazilian Amazon by Acacia mangium (Willd.)

Souza

Chaves

Barbosa

et al. 2018

J Ethnobiology Ethnomedicine

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IntroductionInvasive plants can impact biodiversity as well as the lives of native human populations. Natural ecosystems represent sources of natural resources essential for the subsistence and socio-cultural continuity of these social groups. Approximately 30,000 ha of Acacia mangium were planted for commercial purposes in savanna areas surrounding indigenous lands in Roraima State, Brazil, at the end of the 1990s. We examined the local ecological knowledge of indigenous Wapichana and Macuxi Amerindians, members of the Arawak and Carib linguistic families, respectively, concerning A. mangium Willdenow (Fabaceae) in a savanna ecosystem (“Lavrado”) to attempt to understand its propagation beyond the limits of the commercial plantations and contribute to mitigating its impacts on socio-ecological systems.MethodsThe present study was undertaken in the Moskow, São Domingos, and Malacacheta communities in the Moskow and Malacacheta Indigenous Lands (ILs) in the Serra da Lua region of Roraima State, in the northern Brazilian Amazon region. Interviews were conducted with a total of 94 indigenous individuals of both sexes, with ages between 18 and 76, and low levels of formal schooling, with an average time of permanence in the area of 21 years; some still spoke only their native languages. The interviews focused on their ecological knowledge of the invasive, non-native A. mangium and their uses of it.ResultsThe informants affirmed that A. mangium negatively impacted the local fauna and flora, making their subsistence more difficult and altering their daily routines. Among the problems cited were alterations of water quality (71.3%), negative impacts on crops (60.6%), negative impacts on the equilibrium of the local fauna (52.1%), increased farm labor requirements (41.5%), and restriction of access to indigenous lands (23.4%). There were no significant differences between the opinions of men and women, nor between community leaders and nonleaders. Most of the interviewees (89%) felt that A. mangium had no positive importance for the local economy and saw no future prospects of beneficial use.ConclusionsThe Wapichana and Macuxi informants felt that the invasion by A. mangium had caused negative effects on the natural environment and on community subsistence in the indigenous lands due to its rapid and unwanted propagation. The similarity between the opinions of men and women and between community leaders and nonleaders demonstrates the existence of knowledge that is well distributed among these communities and transmitted within their communities through social–cultural interactions.

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Section: Discussionmentioning

confidence: 99%

Local ecological knowledge concerning the invasion of Amerindian lands in the northern Brazilian Amazon by Acacia mangium (Willd.)

Souza

Chaves

Barbosa

et al. 2018

J Ethnobiology Ethnomedicine

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“…The Cerrado Amapaense covers about 7% of the Amapá State area (Brazil), which comprises several basins that drain either into the Amazonian coastal zone (ZCA) or estuarine coastal zone (Aguiar, Barbosa, Barbosa, & Mourão, ; Barbosa, Campos, Pinto, & Fearnside, ; Carvalho & Mustin, ). One of these basins includes the Pedreira River, which covers an area of 2,086 km 2 , from its headwaters in the municipality of Porto Grande to the ZCA.…”

Section: Introductionmentioning

confidence: 99%

Length–weight relationships of eight fish species from Guyana coastal drainages, Amapá, Brazil

et al. 2019

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The present study provides the length–weight relationships (LWR) for eight fish species in 19 streams from the Pedreira River basin, a small tributary of the Guyana coastal drainages from Amapá State, Brazil. Fishes were collected at two occasions, one in November 2016, the other in July 2018, using hand nets, with 0.5 mm of mesh size and 0.25 m2 of mouth area, and trawl nets, with 0.5 mm of mesh size and 3 m long. Standard length and total weight were measured to determine the LWRs. The results show that the coefficient b varied between 2.798 and 3.380 and thus the values were within the expected range.

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“…Its extensive worldwide introduction in forest plantations established on infertile soils is due not only to the improvement in nitrogen (N) dynamics, but also to soil carbon accretion especially when combined with fast growing species (Binkley et al 2000, Koutika et al 2014. No regarding the beneficial effects cited above, A. mangium may have a negative impact on ecosystems and biodiversity outside its native environment (Aguiar et al 2014). In the current study, we have tried to find out why, besides its successful introduction in Arenosols of the Congolese coastal plains, the acacia trees died in the beginning of the second rotation of mixed-species plantation of acacia and eucalypt.…”

Section: Introductionmentioning

confidence: 99%

Fate of Acacia mangium in eucalypt mixed-species plantations during drought conditions in the Congolese coastal plains

Koutika¹,

Mareschal

Rudowsky³

2018

Bosque (Valdivia)

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SUMMARYA mixed-species plantation of Acacia mangium (acacia) and Eucalyptus urophilla x grandis (eucalypt) hybrid was established on the Arenosols of the coastal Congolese plains to improve soil fertility and sustain forest plantation productivity. At one year into the second rotation, some of the acacia started to exhibit yellowing and drying of leaves, resulting in the death of the whole tree. One-third of the pure acacias (100A) and the mixed, 50 % acacia and 50 % eucalypt (50A50E) hybrid, exhibited these characteristics five months later. To limit the damage, the acacias were pruned up to 1.30 meters. The acacias were threatened by a dry season that extended two months longer than during the previous year, probably triggered by sandy textured soils and poor soil fertility (nitrogen < 0.07 % in the 0.05 meters). Soil moisture to a depth of 0.15 meters was higher under eucalypt compared to acacia. It appears that the acacia root structure may have been less tolerant to drought conditions compared with the eucalypts, leading to damage of acacias, which was exacerbated by the acacia's young age, poor soil fertility and sandy soil texture. One year after pruning, acacias in both 100A and 50A50E presented a healthier tree structure. Furthermore, no negative impact on aboveground biomass -i.e., wood, bark, leaves and branch-has been recorded at 12 and 24 months.Key words: young plantation, dry season, arenosols, pruning. RESUMENPlantaciones mixtas de Acacia mangium (acacia) y el híbrido de Eucalyptus urophilla x grandis (eucalipto) se establecieron en Arenosoles de las llanuras costeras congoleñas para mejorar la fertilidad del suelo y mantener la productividad de las plantaciones forestales. Un año después de la segunda rotación, parte de la acacia mostró un color amarillento y el secado de hojas, lo que provocó la muerte de todo el árbol. Un tercio de las acacias puras (100A) y el híbrido mixto, 50 % de acacia y 50 % de eucalipto (50A50E) exhibieron estas características cinco meses después. Para limitar el daño, las acacias fueron podadas hasta 1,3 m. Las acacias se vieron amenazadas por una estación seca que se extendió dos meses más que el año anterior, probablemente desencadenada por los suelos de textura arenosa, y la fertilidad del suelo (nitrógeno < 0,07 % en 0-5 cm). La humedad del suelo a una profundidad de 15 cm fue mayor bajo eucalipto en comparación con acacia. La estructura de la raíz de acacia pudo haber sido menos tolerante a las condiciones de sequía en comparación con los eucaliptos, lo que ha provocado daños en las acacias, que se han visto agravados por la juventud de la acacia, la fertilidad del suelo y la textura del suelo arenoso. Un año después de la poda, la acacia en 100A y 50A50E presentó estructura de árbol más saludable. Además, no se registró ningún impacto negativo en la biomasa aérea, es decir, madera, corteza, hojas y ramas a los 12 y 24 meses.Palabras clave: plantación joven, estación seca, arenosoles, poda.

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Invasion ofAcacia mangiumin Amazonian savannas following planting for forestry

Cited by 48 publications

References 61 publications

Local ecological knowledge concerning the invasion of Amerindian lands in the northern Brazilian Amazon by Acacia mangium (Willd.)

Local ecological knowledge concerning the invasion of Amerindian lands in the northern Brazilian Amazon by Acacia mangium (Willd.)

Length–weight relationships of eight fish species from Guyana coastal drainages, Amapá, Brazil

Fate of Acacia mangium in eucalypt mixed-species plantations during drought conditions in the Congolese coastal plains

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