Nutrient leaching and deep drainage under Eucalyptus plantations managed in short rotations after afforestation of an African savanna: Two 7-year time series

Mareschal, Louis; Laclau, Jean‐Paul; Nzila, Jean de Dieu; Versini, Antoine; Koutika, Lydie‐Stella; Mazoumbou, Jean-Claude; Deleporte, Philippe; Bouillet, Jean‐Pierre; Ranger, Jacques

doi:10.1016/j.foreco.2013.06.038

Cited by 31 publications

(16 citation statements)

References 58 publications

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Section: Discussionmentioning

confidence: 99%

“…Considering the vertical heterogeneities of roots, not studied here, may provide an additional argument to support the exploration/occupation tradeoff hypothesis. Investing more into deep roots (at the expense of horizontal exploration) may provide a mean to minimize nutrient losses through leaching (Mareschal et al 2013). The existence of exploration/occupation tradeoffs needs to be confirmed by further studies, and the precise shape of these tradeoff should be documented.…”

Section: Soil Exploration and Its Quantificationmentioning

confidence: 99%

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Explore less to control more: why and when should plants limit the horizontal exploration of soil by their roots?

Parseval

Abbadie

Gignoux

et al. 2015

Oikos

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In ecosystems limited by soil nutrients, some plants show a restricted horizontal distribution of their roots. We explored the hypothesis that this particular pattern is a foraging strategy emerging from tradeoffs between soil exploration (that increases the pool of nutrients available for plants) and the local control of nutrient cycling within the soil that we call soil occupation. We developed two general analytical models of the cycling of a limiting nutrient in a plant population that is not limited by water. They allowed to explore how plant productivity is affected when roots do not exploit the whole soil available and to determine the conditions for which plant nutrient stock is maximized when plants limit their exploration of soil. We predict that a restricted exploration strategy can be beneficial when 1) there is at least one tradeoff between a nutrient cycling parameter and soil exploration, 2) nutrient availability in the unexplored soil is poor and 3) the area of soil explored by plants is stable over time. The exploration limitation strategy results in spatially heterogeneous and nutrient-conservative ecosystems. Our results should apply well to perennial tussock grasses within tropical nutrient-limited ecosystems and raises interesting cues for the construction of more sustainable agro-ecosystems. Overall, our study underlines the importance of considering the multiplicity of root-soil interactions and of their scales when considering root foraging strategies.

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Section: Discussionmentioning

confidence: 99%

Section: Soil Exploration and Its Quantificationmentioning

confidence: 99%

Explore less to control more: why and when should plants limit the horizontal exploration of soil by their roots?

Parseval

Abbadie

Gignoux

et al. 2015

Oikos

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“…Foliar leaching returns K to the soil at about the same order of magnitude as the K content in the litter fall in eucalypt plantations. Potassium is released rapidly during litter decomposition and a fast uptake by eucalypt roots leads to the losses by deep drainage being less than the atmospheric inputs, even in sandy soils (Mareschal et al, 2013). In old tropical soils, the amounts of K released by weathering are negligible compared to K requirements for tree growth (Mareschal et al, 2011) and K fertilization is needed to sustain highly productive planted forests .…”

Section: Influence Of Tree Nutrition and Tree Water Status On Lue Andmentioning

confidence: 99%

Measured and modeled interactive effects of potassium deficiency and water deficit on gross primary productivity and light‐use efficiency in Eucalyptus grandis plantations

Christina

Maire

Battie-Laclau

et al. 2015

Global Change Biology

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Global climate change is expected to increase the length of drought periods in many tropical regions. Although large amounts of potassium (K) are applied in tropical crops and planted forests, little is known about the interaction between K nutrition and water deficit on the physiological mechanisms governing plant growth. A process-based model (MAESPA) parameterized in a split-plot experiment in Brazil was used to gain insight into the combined effects of K deficiency and water deficit on absorbed radiation (aPAR), gross primary productivity (GPP), and light-use efficiency for carbon assimilation and stem biomass production (LUEC and LUEs ) in Eucalyptus grandis plantations. The main-plot factor was the water supply (undisturbed rainfall vs. 37% of throughfall excluded) and the subplot factor was the K supply (with or without 0.45 mol K m(-2 ) K addition). Mean GPP was 28% lower without K addition over the first 3 years after planting whether throughfall was partly excluded or not. K deficiency reduced aPAR by 20% and LUEC by 10% over the whole period of growth. With K addition, throughfall exclusion decreased GPP by 25%, resulting from a 21% decrease in LUEC at the end of the study period. The effect of the combination of K deficiency and water deficit was less severe than the sum of the effects of K deficiency and water deficit individually, leading to a reduction in stem biomass production, gross primary productivity and LUE similar to K deficiency on its own. The modeling approach showed that K nutrition and water deficit influenced absorbed radiation essentially through changes in leaf area index and tree height. The changes in gross primary productivity and light-use efficiency were, however, driven by a more complex set of tree parameters, especially those controlling water uptake by roots and leaf photosynthetic capacities.

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“…The Mareschal et al (2013), with eucalyptus plantations in Africa. The differences in nutrients concentrations in the soil profile can be related to the uptake rates and the trees growth.…”

Section: Resultsmentioning

confidence: 99%

“…Mareschal et al (2013) studied the effect to eucalyptus plantations managed in short rotations after afforestation of an African savanna. They indicated that the limited changes between the nutrient fluxes in ecosystems was the result of fast root growth in the deep soil layers after planting, combined with an intense uptake of the tree roots to satisfy the large nutrient and water requirements.…”

Section: Introductionmentioning

confidence: 99%

Chemical composition of soil solution under eucalyptus plantation in Southern Brazil

Viera

Schumacher

2014

ENFLO

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This study focuses on changes in the chemical composition of solutions during their transfer in the soil cultivated with hybrid of Eucalyptus urophylla x Eucalyptus globulus stand in southern Brazil. The chemical composition of soil solution was evaluated from January to December 2010, when the plant was from 8.5 to 9.5 years-old. Ceramic lysimeters were installed in order to measure the chemical composition of the soil solution in two different depths (30 and 80 cm) with six repetitions. The lysimeters were connected to a vacuum pump, where in each four hours, during ten minutes, the solution was suctioned. The soil solutions were collected in glass bottles with 0.5 liters of capacity. Fortnightly the samples were collected and each replicate of soil solution was analyzed separately. The solutions were filtered (0.45 μm) and the nutrients concentrations were measured. . Essa mudança na composição química da solução do solo indica que ocorrem diferentes padrões de absorção de nutrientes pelas raízes das plantas.Palavras -chave: Nutrição florestal; Relação água-planta; Disponibilidade de nutrientes.1 Recebido em 30.08.2014 e aceito para publicação como artigo científico em: 02.12.2014.

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Nutrient leaching and deep drainage under Eucalyptus plantations managed in short rotations after afforestation of an African savanna: Two 7-year time series

Cited by 31 publications

References 58 publications

Explore less to control more: why and when should plants limit the horizontal exploration of soil by their roots?

Explore less to control more: why and when should plants limit the horizontal exploration of soil by their roots?

Measured and modeled interactive effects of potassium deficiency and water deficit on gross primary productivity and light‐use efficiency in Eucalyptus grandis plantations

Chemical composition of soil solution under eucalyptus plantation in Southern Brazil

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