Mineralogical and physico-chemical properties of Ferralic Arenosols derived from unconsolidated Plio-Pleistocenic deposits in the coastal plains of Congo

Mareschal, Louis; Nzila, Jean de Dieu; Turpault, Marie–Pierre; M’Bou, Armel Thongo; Mazoumbou, Jean-Claude; Bouillet, Jean‐Pierre; Ranger, Jacques; Laclau, Jean‐Paul

doi:10.1016/j.geoderma.2011.01.017

Cited by 50 publications

(26 citation statements)

References 59 publications

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“…The soil is a deep Ferralic Arenosol, overlaying geological bedrock of thick detritic layers (continental origin from Plio-Pleistocene). Soil fertility is low, with a low CEC (< 0.5 cmol+ kg −1 ), high sand content (> 90 % of mineral soil), very low clay and silt content ( 2 to 6 % according to depth, respectively) and low iron oxides content (< 1.5 % of the bulk soil, Mareschal et al 2011). The climate is subequatorial with a cool dry season extending typically from May to September, with the mean annual rainfall of 1,250 mm and more than 85 % of atmospheric moisture.…”

Section: Methodsmentioning

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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Section: Methodsmentioning

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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“…A reason for this discrepancy could be the larger range of pedoclimatic conditions covered by the studies described above (e.g., region and national scales compared to our woodland scale). Furthermore, the soils addressed in our study have an identical geologic origin (Cosson, 1955;Jamet and Rieffel, 1976;Mareschal et al, 2011), which probably increased the difficulty of observing differences using classical soil analyses.…”

Section: Measured Dominant Height (M)mentioning

confidence: 92%

“…The soils in the area developed from continental sediment depositions dating from the plio-pleistocene (Jamet and Rieffel, 1976;Mareschal et al, 2011) and originated from the erosion of the Mayombe mountains (Cosson, 1955). The soils are thick, ranging from 80 to 300 m, and belong to the Ferralic Arenosol class (FAO, 1998).…”

Section: Study Sitementioning

confidence: 99%

“…These results suggest that clay content variations led to a difference in CEC as well as better soil structure and water retention. Although more than 80% of the clay fraction in PointeNoire soils was comprised of kaolinite, the 3% consisting of vermiculite accounted for 52% of the clay CEC and 49% of the total mineral CEC (Mareschal et al, 2011). Thus, a small difference in vermiculite, which is undetectable using classical soil analysis, might enhance the site index.…”

Section: Site Index Prediction From Nirsmentioning

confidence: 99%

“…Soils on the coastal plains of Congo are sandy (more than 90% sand), and the clay fraction (<5%) is dominated by kaolinite; they are chemically poor in K, total N, OM and are characterised by a low CEC (<0.5 cmol c kg soil À1 ) in all soil layers Bouillet et al, 2004;Mareschal et al, 2011). However, the soils in this region are deep (more than 80 m), without any obstacle to limit the depth of root growth .…”

Section: Introductionmentioning

confidence: 99%

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Mineralogical and physico-chemical properties of Ferralic Arenosols derived from unconsolidated Plio-Pleistocenic deposits in the coastal plains of Congo

Cited by 50 publications

References 59 publications

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

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

Are NIR spectra useful for predicting site indices in sandy soils under Eucalyptus stands in Republic of Congo?

Nitrogen-fixing trees increase organic carbon sequestration in forest and agroforestry ecosystems in the Congo basin

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