J. Machı́n

Estación Experimental de Aula Dei

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Ana Navas

Estación Experimental de Aula Dei

Blas L. Valero‐Garcés

Instituto Pirenaico de Ecología

Manuel López‐Vicente

Universidade da Coruña

Leticia Gaspar

National Research Council

Penélope González‐Sampériz

Instituto Pirenaico de Ecología

Antonio Delgado‐Huertas

Instituto Andaluz de Ciencias de la Tierra

D. E. Walling

University of Exeter

Tony Stevenson

British Geological Survey

Basil Davis

University of Lausanne

Ana Moreno

Instituto Pirenaico de Ecología

Cooperative Institutions

Consejo Superior de Investigaciones Científicas

Estación Experimental de Aula Dei

Instituto Pirenaico de Ecología

National Research Council

Universidad de Zaragoza

Universidad de Cantabria

Gobierno de Aragón

Universidad de Murcia

Instituto Geológico y Minero de España

Universidad de Granada

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Modelling soil detachment rates in rainfed agrosystems in the south-central Pyrenees

Agricultural Water Management (2008)

Manuel López‐Vicente Ana Navas J. Machı́n

10.1016/j.agwat.2008.04.004

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Citations (31)

Caracterización edáfica y distribución de 137Cs en perfiles de suelos representativos de agrosistemas mediterráneos de montaña

Informacion Tecnica Economica Agraria (2014)

Leticia Gaspar Ana Navas J. Machı́n Manuel López‐Vicente José Gómez Arozamena

Caracterizar los suelos y conocer sus propiedades fisicoquímicas es fundamental para interpretar los datos de 137 Cs y evaluar las implicaciones que el tipo y uso de suelo, agrario, ganadero o forestal, tienen sobre el comportamiento del radioisótopo en el suelo.En este trabajo se han caracterizado suelos representativos de agrosistemas mediterráneos de montaña mediante la apertura de calicatas, el estudio detallado de sus propiedades fisicoquímicas, y el análisis por difracción de rayos X de perfiles de suelo.Asimismo, para evaluar la repercusión del uso del suelo sobre el contenido y distribución del radioisótopo, sus implicaciones sobre los procesos de pérdida de suelo, y la posible transferencia del 137 Cs a las plantas, se han muestreado 13 perfiles seccionados de suelos agrícolas y forestales en Calcisoles, Leptosoles, Regosoles, Gypsisoles y Gleysoles.Se observó un amplio rango de variación tanto de las principales propiedades fisicoquímicas de suelo como del contenido de 137 Cs, que se relacionó directa y significativamente con la materia orgánica.Los valores de 137 Cs más altos se registraron en Leptosoles no cultivados en suelos forestales, en los que se observó una distribución del radioisótopo exponencialmente decreciente con la profundidad, mientras que los Gypsisoles y Regosoles cultivados registraron las concentraciones más bajas, con perfiles homogéneos en profundidad por efecto del laboreo.Los resultados de esta investigación evidencian el efecto del

10.12706/itea.2013.037

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Identifying erosive periods by using RUSLE factors in mountain fields of the Central Spanish Pyrenees

Hydrology and earth system sciences (2008)

Manuel López‐Vicente Ana Navas J. Machı́n

Abstract. The Mediterranean environment is characterized by strong temporal variations in rainfall volume and intensity, soil moisture and vegetation cover along the year. These factors play a key role on soil erosion. The aim of this work is to identify different erosive periods in function of the temporal changes in rainfall and runoff characteristics (erosivity, maximum intensity and number of erosive events), soil properties (soil erodibility in relation to freeze-thaw processes and soil moisture content) and current tillage practices in a set of agricultural fields in a mountainous area of the Central Pyrenees in NE Spain. To this purpose the rainfall and runoff erosivity (R), the soil erodibility (K) and the cover-management (C) factors of the empirical RUSLE soil loss model were used. The R, K and C factors were calculated at monthly scale. The first erosive period extends from July to October and presents the highest values of erosivity (87.8 MJ mm ha−1 h−1), maximum rainfall intensity (22.3 mm h−1) and monthly soil erosion (0.25 Mg ha−1 month−1) with the minimum values of duration of erosive storms, freeze-thaw cycles, soil moisture content and soil erodibility (0.007 Mg h MJ−1 mm−1). This period includes the harvesting and the plowing tillage practices. The second erosive period has a duration of two months, from May to June, and presents the lowest total and monthly soil losses (0.10 Mg ha−1 month−1) that correspond to the maximum protection of the soil by the crop-cover ($C$ factor = 0.05) due to the maximum stage of the growing season and intermediate values of rainfall and runoff erosivity, maximum rainfall intensity and soil erodibility. The third erosive period extends from November to April and has the minimum values of rainfall erosivity (17.5 MJ mm ha−1 h−1) and maximum rainfall intensity (6.0 mm h−1) with the highest number of freeze-thaw cycles, soil moisture content and soil erodibility (0.021 Mg h MJ−1 mm−1) that explain the high value of monthly soil loss (0.24 Mg ha−1 month−1). The interactions between the rainfall erosivity, soil erodibility, and cover-management factors explain the similar predicted soil losses for the first and the third erosive periods in spite of the strong temporal differences in the values of the three RUSLE factors. The estimated value of annual soil loss with the RUSLE model (3.34 Mg ha−1 yr−1) was lower than the measured value with 137Cs (5.38 Mg ha−1 yr−1) due to the low values of precipitation recorded during the studied period. To optimize agricultural practices and to promote sustainable strategies for the preservation of fragile Mediterranean agrosystems it is necessary to delay plowing till October, especially in dryland agriculture regions. Thus, the protective role of the crop residues will extend until September when the greatest rainfall occurs together with the highest runoff erosivity and soil losses.

Plough

10.5194/hess-12-523-2008

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Citations (106)

Human Impact Since Medieval Times and Recent Ecological Restorationin a Mediterranean Lake: The Laguna Zoñar, Southern Spain

Journal of Paleolimnology (2006)

Blas L. Valero‐Garcés Penélope González‐Sampériz Ana Navas J. Machı́n M. Pilar Mata

10.1007/s10933-005-1995-2

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Citations (58)

Responses of a Saline Lake Ecosystem in a Semiarid Region to Irrigation and Climate Variability

AMBIO (2000)

Blas L. Valero‐Garcés Ana Navas J. Machı́n Tony Stevenson Basil Davis

Ephemeral key

Lake ecosystem

Aridification

10.1639/0044-7447(2000)029[0344:roasle]2.0.co;2

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Citations (32)

Splash erosion under natural rainfall on three soil types in NE Spain

Geomorphology (2012)

M. Angulo‐Martínez Santiago Beguerı́a Ana Navas J. Machı́n

10.1016/j.geomorph.2012.06.016

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Citations (100)

Advanced modelling of runoff and soil redistribution for agricultural systems: The SERT model

Agricultural Water Management (2013)

Manuel López‐Vicente Ana Navas Leticia Gaspar J. Machı́n

WEPP

Infiltration (HVAC)

10.1016/j.agwat.2013.04.002

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Citations (33)

Using 137Cs and 210Pbex to assess soil redistribution on slopes at different temporal scales

CATENA (2011)

Leticia Gaspar Ana Navas D. E. Walling J. Machı́n Jana Arozamena

Deposition

10.1016/j.catena.2011.01.004

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Citations (113)

Spatial analysis of gypsiferous soils in the Zaragoza province (Spain), using GIS as an aid to conservation

Geoderma (1998)

J. Machı́n Ana Navas

Regosol

Outcrop

10.1016/s0016-7061(98)00071-8

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Citations (35)

Reconstructing the history of sediment accumulation in the Yesa reservoir: an approach for management of mountain reservoirs

Lake and Reservoir Management (2009)

Ana Navas Blas L. Valero‐Garcés Leticia Gaspar J. Machı́n

Abstract Navas, A., B. CitationValero-Garcés, L. Gaspar and J. Machín. 2008. Reconstructing the history of sediment accumulation in the Yesa reservoir: an approach for management of mountain reservoirs. Lake Reserv. Manage. 25:15–27. The Aragón River was impounded at the foothills of the Pyrenean Internal Depression in 1959; since then sediments accumulations have decreased the reservoir storage capacity. In this work, we interpreted the history of the sediment accumulation in the Yesa reservoir based on the detailed study of two sediment cores collected at the more stable area in the reservoir. The identification of main sedimentological facies together with the analysis of the grain size distribution of the materials accumulated at the bottom of the reservoir was used for interpretations of the sedimentary dynamics. These data were compared with records of known flood events to derive a tentative chronology of the infilling process by assigning main changes observed in the facies types and sediment components to specific years. In addition to grain size data of sediments accumulated in the river channels, suspended sediments from representative sites of the Aragón Basin to the Yesa reservoir were collected during high and low waters and analysed. Grain size data and sediment composition (organic matter, carbonates) were used to assess the characteristics and the pattern of the sediment transport through the Aragón River network and the role played by lithology and land use. The results provide information on the sediment transport. This approach can be used to assess the siltation processes in Mediterranean mountain reservoirs to improve the management of water bodies by preventing their infilling.

Siltation

Lithology

Sedimentary budget

Sedimentation

10.1080/07438140802714304

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Citations (34)