Contrasted effects of annual and perennial grasses on soil chemical and biological characteristics of a grazed Sudanian savanna

Yé, Lambiénou; Lata, Jean Christophe; Massé, Dominique; Nacro, Hassan Bismarck; Kissou, Roger; Diallo, N.H.

doi:10.1016/j.apsoil.2017.02.003

Cited by 12 publications

(7 citation statements)

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“…The collapsed system may then be invaded by alternative species differing in their N niche. This result is reminiscent of empirical observations in some West African savannas, where the overgrazing of perennial, nitrificationinhibiting plants, lead to their replacement by annual grasses that do not control nitrification (César, 1992;Yé et al, 2017) and to a much lower primary production than perennial grasses.…”

Section: Nitrification Control and Ammonium Vs Nitrate Preference Con...supporting

confidence: 56%

Nitrification Control by Plants and Preference for Ammonium versus Nitrate: Positive Feedbacks Increase Productivity but Undermine Resilience

Ardichvili,

Loeuille,

Lata

et al. 2024

The American Naturalist

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Some plants, via their action on microorganisms, control soil nitrification, i.e. the transformation of ammonium into nitrate. We model how the co-variation between plant control of nitrification and preference for ammonium vs. nitrate impacts ecosystem properties such as productivity, nitrogen (N) losses and overall resilience. We show that the control of nitrification can maximize productivity by minimizing total inorganic N losses. We initially predicted that plants with an ammonium preference should achieve the highest biomass when inhibiting nitrification; and conversely that plants preferring nitrate should achieve the highest biomass by stimulating nitrification. With a parametrization derived from the Lamto savanna (Ivory Coast), we find that productivity is maximal for plants that slightly prefer ammonium and inhibit nitrification.Such situations however lead to strong positive feedbacks that can cause abrupt shifts from a highly to a lowly productive ecosystem. The comparison with other parameter sets (Pawnee short-grass prairie (USA), intensively cultivated field, and a hypothetical parameter set in which ammonium is highly volatilized and nitrate inputs are high) shows that strategies yielding the highest biomass may be counter-intuitive (i.e. preferring nitrate but inhibiting nitrification). We argue that the level of control yielding the highest productivity depends on ecosystem properties (quantity of N deposition, leaching rates and baseline nitrification rates), not only preference.Finally, while contrasting N preferences offer, as expected, the possibility of coexistence through niche partitioning, we stress how control of nitrification can be framed as a niche construction process that adds an additional dimension to coexistence conditions.

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Section: Nitrification Control and Ammonium Vs Nitrate Preference Con...supporting

confidence: 56%

Nitrification Control by Plants and Preference for Ammonium versus Nitrate: Positive Feedbacks Increase Productivity but Undermine Resilience

Ardichvili,

Loeuille,

Lata

et al. 2024

The American Naturalist

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“…Senescence and pruning/cutting management or desiccation of aboveground parts of cover crops constitute the main route in which nutrients return to the soil after decomposition/mineralization of the residues, closing the cycle. Besides, perennial grasses can build up dense root systems over time, and also affect the dynamic of nutrient cycling in the soil and consequently soil fertility profile (Yé et al, 2017).…”

Section: Nutrient Cycling By Urochloa In Conservation Agriculturementioning

confidence: 99%

Urochloa in Tropical Agroecosystems

Baptistella¹,

Andrade

Favarin³

et al. 2020

Front. Sustain. Food Syst.

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Increasing biodiversity is an important issue in more secure and sustainable agriculture. Diversified systems are more resilient to climate change, environmental stresses and enhance soil health, nutrient cycling and nutrient use efficiency. In tropical agroecosystems, cover crops and intercrops are an alternative toward a more diverse and sustainable production. Urochloa spp. (syn. Brachiaria spp.) are perennial grasses, known for their high biomass production. They are commonly used as cover and companion crops in conservation agriculture in the tropics and the residues left in the field after cutting protect the soil and provide nutrient to the next crop cycle or intercropped culture. Urochloa species roots are vigorous, abundant and deep, as opposed to the more shallow and scarce roots of common crops. These traits contribute to carbon sequestration, soil organic matter stabilization and nutrient cycling. Urochloa roots also improve soil physical characteristics and influence soil nutrient dynamics, reducing nutrient losses and enhancing cycling, what is key to achieve greater nutrient use efficiency in agriculture. For instance, Urochloa root exudates can reduce nitrogen losses by denitrification and leaching through a process called biological nitrification inhibition; root exudates can mobilize recalcitrant phosphorus from soils and make it available for plant uptake; the deep roots of these grasses have the potential to recover nutrients that are virtually lost away from the root zone of other crops. This review compiles scientific progress regarding the introduction of Urochloa in agroecosystems, mainly on the aspects related to the contribution to more secure and sustainable agriculture.

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“…Les principaux types de sols sont : les sols ferrugineux tropicaux lessivés modaux, les sols ferrugineux tropicaux lessivés à taches et à concrétions, les sols ferrugineux tropicaux lessivés indurés, les sols peu évolués ; les sols à minéraux bruts. On note une dominance des sols ferrugineux tropicaux lessivés qui sont caractérisés par de faibles teneurs en matière organique, en azote, en phosphore et en magnésium (BUNASOLS, 1985 ;Yé, 2013 ;Yé et al, 2017). Le pH varie de 4,12 à 7,45 avec une moyenne de 5,34 (Yé, 2013).…”

Section: Materiel Et Methodes Zone D'étudeunclassified

Evaluation of trace metal content in soils subjected to inputs of solid urban wastes

Yé¹,

Lompo²,

Sako³

et al. 2021

Int. J. Bio. Chem. Sci

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Large amounts of solid urban waste (SUW), sometimes containing trace metal (TM), are used to fertilize agricultural soils. The aim of this study was to assess concentrations of TM in peri-urban agricultural soils exposed to SUW inputs around Bobo-Dioulasso. Composite samples of fourteen soil profiles (0-20 cm, 20-40 cm and 40-60 cm) were collected in the classified Dindéréso forest in the outskirts of Bobo-Dioulasso. Inductively coupled plasma mass spectrometry (ICP/MS) was used to analyze TM concentrations in the samples. Concentrations of Cd, Cr, Cu, Ni, Pb and Zn varied broadly according to the sampling sites and soil horizons. The maximum concentrations of the analyzed elements in all sites were lower than the limit concentrations. Regardless soil horizons, the pollution index were less than 1, suggesting that the sampled soils were not subject to multiple contaminations of TM. D’importantes quantités de déchets urbains solides (DUS), renfermant parfois des éléments traces métalliques (ETM), sont utilisées pour fertiliser les sols agricoles. Le but de cette étude est d’évaluer les concentrations en ETM des sols péri-urbains de la ville de Bobo-Dioulasso soumis à l’épandage des DUS. Des échantillons composites de sols ont été prélevés, suivant les horizons 0-20 cm, 20-40 cm et 40-60 cm, sur quatorze sites dans la forêt classée de Dindérésso située à la périphérie de la ville de Bobo-Dioulasso. L’analyse des échantillons de sol a été effectuée par spectrométrie de masse avec plasma à couplage inductif (ICP/MS). Les résultats montrent que les concentrations en Cd, Cr, Cu, Ni, Pb et Zn des sols sont très variées. Elles varient en fonction de l’ETM, du site et de l’horizon du sol. Les concentrations des différents ETM dans les sols sont inférieures aux valeurs limites sur tous les sites. L’index de pollution de chaque site est inférieur à 1, quel que soit l’horizon de sol, suggérant ainsi que les sites de la zone ne font pas l’objet d’une contamination multiple de leurs sols par les ETM.

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Contrasted effects of annual and perennial grasses on soil chemical and biological characteristics of a grazed Sudanian savanna

Cited by 12 publications

References 50 publications

Nitrification Control by Plants and Preference for Ammonium versus Nitrate: Positive Feedbacks Increase Productivity but Undermine Resilience

Nitrification Control by Plants and Preference for Ammonium versus Nitrate: Positive Feedbacks Increase Productivity but Undermine Resilience

Urochloa in Tropical Agroecosystems

Evaluation of trace metal content in soils subjected to inputs of solid urban wastes

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