Person: Santisteban Navarro, Juan Ignacio
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First Name
Juan Ignacio
Last Name
Santisteban Navarro
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Geodinámica, Estratigrafía y Paleontología
Area
Estratigrafía
Identifiers
6 results
Search Results
Now showing 1 - 6 of 6
Item Assessment of the transferred water infiltration in the management of a Mediterranean man-maintained wetland: las Tablas de Daimiel national park (Spain)(Polish Geological Institute Special Papers, 2005) Castaño Castaño, Silvino; Martínez Alfaro, Pedro Emilio; Martínez Santos, Pedro; Mediavilla López, Ros; Santisteban Navarro, Juan Ignacio; López Pamo, EnriqueLas Tablas de Daimiel National Park wetlands (Central Spain) have had their main origin in the West La Macha aquifer discharges. Inflows into these wetlands ceased due to the intensive aquifer exploitation. A progresive deterioration of the wetland brought about several attempts of remedial actions by means of building several small dams and pumping groundwater to the Las Tablas basin. The main attempt to preserve these wetlands has been made by means of the inter-basins tranfers. However, a part of these water transfers is lost within the wetland basin due to the infiltration into the underlying aquifer. Infilitration becomes an essential parameter in any study related to the attempts at keemping some water in the basin and, therefore, in the integrated managmeent of the water resources systems related to the wetland. The actual extent of these losses is difficult to quantify due to the poor quality of existing data as well as to the lack of determination of various important parameters. A methodology based on dailiy water balance in the wetland basin allows to assess that losses and can be used for the National Park water management.Item Cambios en el almacenamiento de C en el Parque Nacional de Las Tablas de Daimiel (PNTD) en los últimos 1000 años(Boletín Geológico y Minero, 2006) Domínguez Castro, Fernando; Santisteban Navarro, Juan Ignacio; Mediavilla López, Rosa María; Dean, Walter E.; López Pamo, Enrique; Gil García, María Elena; Ruiz Zapata, María BlancaEl Parque Nacional de Las Tablas de Daimiel ha sufrido muchas modificaciones a lo largo de su historia, tanto naturales como antrópicas y éstas han afectado de manera diversa al almacenamiento de carbono en el mismo. Para estudiar estas variaciones se ha realizado un análisis del registro sedimentario y de datos históricos de la zona. El registro sedimentario se estudió a partir del sondeo Cigüela 4 al que se le ha realizado un muestreo sistemático de alta resolución (0.7 cm de grosor medio) para analizar su geoquímica y su contenido polínico. Al analizar todos los datos hemos visto que los cambios naturales (asociados al clima) poseen mayores rangos de variación que los antrópicos, no muestran relación con la concentración de CO2 atmosférico y presentan una ciclicidad natural con una amortiguación rápida (décadas) de las variaciones. Sin embargo los impactos antrópicos dependen de la proximidad del impacto y la intensidad del mismo; así el cambio de usos producido a mediados del siglo XIX debido a la desamortización fue un impacto indirecto, de intensidad media y el medio fue capaz de recuperar los valores de almacenamiento normales en menos de 50 años. Sin embargo los episodios de desecación y sobreexplotación del acuífero que alimentaba el Parque Nacional (segunda mitad del siglo XX) fueron impactos directos de alta intensidad, durante los cuales la rápida pérdida de superficie inundada y la salinización del medio, causó una drástica pérdida en la capacidad del ecosistema para almacenar C, de la cual no parece que el ecosistema sea capaz de recuperarse de manera natural. [ABSTRACT] Las Tablas de Daimiel National Park has suffered too many modifications throughout its history, natural as well as anthropic, which have affected the carbon storage in different ways. The study of those variations has been carried out by the analysis of sedimentary record and historical data. The sedimentary record has been studied from the core Cigüela 4. It was sampled with a systematic high resolution method (0.7 cm thickness average) to analyze geochemistry and pollen. The analysis of all data shows that the natural changes (engaged with the climate) have more variation ranges than the anthropic ones, are directly related with the climate and not with the concentration of the atmospheric CO2, showing a natural cyclicity with a fast mitigation (decades) of the variations. In the other hand the anthropogenic impacts depend on the proximity and intensity of the impact. The usage changes produced during the second half of the 19th century were an indirect impact with medium intensity. The environment had the capacity to recover the values of a normal storage in less than 50 years. Nevertheless the dissication and overexploitation of the groundwater (second half of 20th century) were direct and high intensity impacts. These impacts caused a fast lost of the water table and the salinization of the environment. Due to that the ecosystem lost capacity to storage C. The recovering of the normal values by a natural way is difficult now.Item Environmental and geochemical record of human-induced changes in C storage during the last millennium in a temperate wetland (Las Tablas de Daimiel National Park, central Spain)(Tellus. Series B, Chemical and physical meteorology, 2006) Domínguez Castro, Fernando; Santisteban Navarro, Juan Ignacio; Mediavilla López, Rosa María; Dean, Walter E.; López Pamo, Enrique; Gil García, María Elena; Ruiz Zapata, María BlancaLas Tablas de Daimiel National Park has experienced many hydrological and ecological modifications through out its history, both of natural as well as anthropogenic origin, which have affected its carbon storage capacity and carbon fluxes. The study of those variations has been carried out by the analysis of its sedimentary record (geochemistry and pollen) and historical data. The natural changes have a wider variation range than the anthropogenic ones, showrepetitive patterns and the system reacts readjusting the equilibrium among its components. Anthropogenic effects depend on the direct or indirect impact on the wetlands of change and its intensity. In addition, the anthropogenic impacts have the capacity of breaking the natural balance of the ecosystem and the internal interactions.Item Late holocene environments in Las Tablas de Daimiel (south central Iberian peninsula, Spain)(Vegetation history and archaeobotany, 2007) Gil García, María Elena; Ruiz Zapata, María Blanca; Santisteban Navarro, Juan Ignacio; Mediavilla López, Rosa María; López Pamo, Enrique; Dabrio González, Cristino JoséThe use of a high resolution pollen record in combination with geochemical data from sediments composed mainly of layers of charophytes alternating with layers of vegetal remains plus some detrital beds permits the reconstruction of the environmental evolution of the last 3000 years in an inland wetland of the Mediterranean domain, thus introducing a new climatic dataset for the Late Holocene. Hydrological fluctuations, reflected in the relationship between emerged and aquatic vegetation and inorganic and organic C and N changes, can be related to aridity or humid phases, while relations among arboreal taxa (Quercus and Pinus) and Artemisia are used as temperature indicators. Five climatic periods have been identified: a Subatlantic Cold Period (<150 b.c.), cold and arid; the RomanWarm Period (150 b.c.–a.d. 270), warmer and wetter; the Dark Ages (a.d. 270–a.d. 950), colder and drier; the Medieval Warm Period (a.d. 950–a.d. 1400), warmer and wetter; and the Little Ice Age (>a.d. 1400) indicated by a cooling and drying trend. Despite the lack of any direct evidence of human action, there are some episodes related to deforestation during the Reconquista (Middle Ages) that mask the real climatic signal.Item Evolución climática durante el último siglo (1904-2002) en el Parque Nacional de las Tablas de Daimiel (Ciudad Real)(Geotemas, 2004) Martínez Santos, Pedro; Castaño Castaño, Silvino; Santisteban Navarro, Juan Ignacio; Martínez Alfaro, Pedro Emilio; Mediavilla López, Rosa María; López Pamo, EnriqueLas Tablas de Daimiel National Park (Ciudad Real, central Spain) is a very delicate wet/and that during the last century has experienced noticeable human-induced modifications. In order to understand the relations among climate, environment dynamics and human activity ;n this area, detailed analyses of meteorological series are required. Analysis of meteorological series corresponding to nine weather stations close to the Las Tablas de Daimiel National Park allows the reconstruction of regional climate for the 1904-2002 period. Four periods have been identified based on temperature records: 1904-1937, cold; 1938-1958, warm; 1959-1990, cold; 1991-2002, warm. Other four periods are identified considering rainfall variability: 1904-1954, dry; 1955- 1979, wet; 1980-1995, dry; 1996-2002, wet. A comparison of the climatic series to the main hydrological events reveals that there is no clear relationship between climate evolution and hydrology. Consequently, we argue that the human control over the environment evolution for the last 50 years has been more significant than the climatic and endogenic controls.Item Loss on ignition: a qualitative or quantitative method for organic matter and carbonate mineral content in sediments?(Journal of paleolimnology, 2004) Santisteban Navarro, Juan Ignacio; Mediavilla López, Rosa María; López Pamo, Enrique; Dabrio González, Cristino José; Ruiz Zapata, María Blanca; Gil García, María Elena; Castaño Castaño, Silvino; Martínez Alfaro, Pedro EmilioSince the publication of the paper of Dean (1974), loss on ignition (LOI) has been widely used as a method to estimate the amount of organic matter and carbonate mineral content (and indirectly of organic and inorganic carbon) in sediments. The relationships between LOI at 550 ºC (LOI550) and organic carbon (OC) content and between LOI at 950 ºC (LOI950) and inorganic carbon (IC) content are currently accepted as a standard. However, the comparison of 150 analyses of samples of diverse lithologies, collected from a single core, reveals that these relationships are affected by sediment composition (presence of clays, salts, and the variable content of organic carbon). This results in an incremental error on the estimation of carbon content from LOI values that invalidates the use of LOI values as a quantitative method for estimating carbon content. Conversely, the general trends of LOI550 and LOI950 show a good correlation with carbon content (both organic and inorganic) allowing use of LOI as a qualitative test for carbon content. Similarly, in our case, LOI at 105 ºC (LOI105) is a good qualitative proxy for the trends in gypsum content.