Arias Fariñas, Nerea

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https://academica-e.unavarra.es/handle/2454/48582

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Arias Fariñas

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Nerea

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Ciencias del Medio Natural

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751859

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810135

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2017 - 201912020 - 20211
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Author: Orcaray Echeverría, Luis ×

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    PublicationOpen Access
    Irrigation and SOC sequestration in the region of Navarre in Spain
    (FAO, 2021) Virto Quecedo, Íñigo; Antón Sobejano, Rodrigo; Enrique Martín, Alberto; Orcaray Echeverría, Luis; Arias Fariñas, Nerea; Ciencias; Zientziak
    The project REGADIOX, funded by the European Commission LIFE Program was based on the establishment of a regional-scale network of representative agricultural plots in three irrigation districts in Navarre (NE Spain). The project allowed for a rational evaluation of soil organic C (SOC) sequestration and greenhouse gases (GHG) emissions balances by using paired comparisons in terms of soil characteristics in irrigated vs rainfed plots. The results showed a clear influence of irrigation in soil condition, arising from greater SOC storage. The net effect was however modulated by soil characteristics and management practices, in so far as the different agricultural strategies did have different potential to sequester SOC and/or reduce GHG emissions. While permanent crops with green cover (which was possible thanks to irrigation) or semi-permanent crops as alfalfa were win-win strategies with positive C balances, intensive systems with two crops per year, although they also contributed to SOC gains, represented increased GHG emissions. The observed changes in SOC associated to irrigation with different managements also showed that irrigation adoption can alter the soils’ capacity to provide key ecosystem services beyond biomass production, as changes in soils properties related to SOC, such as water-holding capacity or soil erodibility were also observed. These changes were, however, not straightforward and varied depending on soil type, climate and time under irrigation.
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    PublicationOpen Access
    Efecto de la agricultura de conservación y la fertilización nitrogenada en la población de plantas adventicias en una parcela de trigo en regadío
    (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2017) Arias Fariñas, Nerea; Lezáun, Juan Antonio; Garnica, Irache; Orcaray Echeverría, Luis; Pérez de Ciriza, José Jesús; Delgado, Javier
    El uso de técnicas como la agricultura de conservación o la reducción de nitrógeno aplicado en campo pueden causar cambios en la composición y abundancia de las especies de malas hierbas presentes en los sistemas de cultivo. En el monitoreo de la flora adventicia en un cultivo de trigo que siguió una rotación de maíz-sorgo-trigo se observó que especies como Avena sterilis o Salsola kali desaparecieron tras la rotación de dos cultivos de verano. La aplicación de una dosis de fertilización nitrogenada reducida no produjo diferencias significativas en el número de plantas presentes por metro cuadrado en las parcelas de estudio. Sin embargo, la aplicación del no laboreo (NL) generó un mayor desarrollo de la biomasa de las plantas adventicias lo que puede conducir a una mayor competencia con el cultivo, y por ello, una disminución del rendimiento.