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  1. Conference proceedings ; Online: Reduction of sediments and nutrients reaching the coastal lagoon of the Mar Menor (Spain)

    Sepulveda-Perez, J. / Francés Garcia, F. / Puertes, C.

    XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)

    what can we do?

    2023  

    Abstract: In recent decades, the Mar Menor coastal lagoon has experienced a significant deterioration in the quality of its waters. The first source is the intensive agriculture in its watershed, with poor or non-application of soil conservation measures and ... ...

    Abstract In recent decades, the Mar Menor coastal lagoon has experienced a significant deterioration in the quality of its waters. The first source is the intensive agriculture in its watershed, with poor or non-application of soil conservation measures and excessive nitrogenous fertilizers. The second source are the abandoned open-pit mining zones.The aim of this study is, on one hand, to estimate the current nitrogen and sediment inputs to the lagoon and, in the other hand, to evaluate the impact of different control measures in order to select and prioritize the most effective ones. In this way, it will be possible to improve the ecological status of the lagoon. The distributed eco-hydrological model TETIS was used for these two objectives, activating the sediment, nitrogen and crop modules. The model was implemented with a spatial discretization was 5 m at daily time step.The evaluated measures are: reforestation of the mineral extraction zone with coniferous, use of support practices like hedgerows and contouring, adjustment of the applied fertilizer, zones where irrigated intensive crops are replaced by olive trees, shrubs and terracing, and finally, sediment retention ponds.Reforestation and terracing are crucial to reduce the sediment yield and the high erosion rates. Support practices and crop replacements shows a significant reduction in the case of the nitrogen associated to the runoff (water and sediments) which discharges directly into the lagoon. Finally, fertilizer adjustment is the more effective measure to reduce the nitrogen input to runoff and percolation.
    Subject code 550
    Language English
    Publishing date 2023-07-11
    Publishing country de
    Document type Conference proceedings ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Improving the modelling and understanding of carbon-nitrogen-water interactions in a semiarid Mediterranean oak forest

    Puertes, Cristina / González-Sanchis, María / Lidón, Antonio / Bautista, Inmaculada / del Campo, Antonio D / Lull, Cristina / Francés, Félix

    Ecological modelling. 2020 Mar. 15, v. 420

    2020  

    Abstract: Mediterranean drylands are often nutrient poor, but parameter requirements of forest ecosystem models are usually high. Therefore, there is a need for developing parsimonious nutrients models. In that sense, this study aims to contribute to a better ... ...

    Abstract Mediterranean drylands are often nutrient poor, but parameter requirements of forest ecosystem models are usually high. Therefore, there is a need for developing parsimonious nutrients models. In that sense, this study aims to contribute to a better understanding and modelling of the hydrological and biogeochemical (carbon and nitrogen) cycles and their interactions in semiarid conditions and to test the capability of a new parsimonious model to satisfactorily reproduce them. The proposed model (TETIS-CN) and two additional widely used models were implemented in a Quercus ilex forest, and no noteworthy differences were found. Results suggest that: (1) it is important to include carbon observations in the calibration process and to consider all the existing vegetation species in the simulation; (2) a fixed daily potential uptake may not be appropriate to reproduce plant nitrogen uptake; and (3) TETIS-CN, with a lower number of parameters, proved an acceptable tool.
    Keywords Quercus ilex ; arid lands ; biogeochemical cycles ; carbon ; ecological models ; forest ecosystems ; forests ; hydrology ; nitrogen ; nutrients ; plant nitrogen content ; semiarid zones ; Mediterranean region
    Language English
    Dates of publication 2020-0315
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 191971-4
    ISSN 0304-3800
    ISSN 0304-3800
    DOI 10.1016/j.ecolmodel.2020.108976
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

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  3. Article ; Online: Impact of a transformation from flood to drip irrigation on groundwater recharge and nitrogen leaching under variable climatic conditions.

    Pool, Sandra / Francés, Félix / Garcia-Prats, Alberto / Puertes, Cristina / Pulido-Velazquez, Manuel / Sanchis-Ibor, Carles / Schirmer, Mario / Yang, Hong / Jiménez-Martínez, Joaquín

    The Science of the total environment

    2022  Volume 825, Page(s) 153805

    Abstract: The sustainability of agriculture in the Mediterranean climate is challenged by high irrigation water demands and nitrogen fertilizer losses to the environment, causing significant pressure on groundwater resources and groundwater-dependent ecosystems. ... ...

    Abstract The sustainability of agriculture in the Mediterranean climate is challenged by high irrigation water demands and nitrogen fertilizer losses to the environment, causing significant pressure on groundwater resources and groundwater-dependent ecosystems. Advanced irrigation technologies and improved fertilizer management have been promoted as key solutions to reduce the agricultural impact on aquatic systems. However, it remains unclear how different irrigation-fertilizer practices perform on the long-term under a highly variable climate, such as the Mediterranean one. Here, we conduct hydrological simulations over a fifty-year period to quantify the magnitude and dynamics of groundwater recharge and nitrogen leaching under five real-case irrigation-fertilizer practices observed in Valencia (eastern Spain). The Valencian Region is the largest citrus-producing region of Europe and current irrigation-fertilizer practices reflect the ongoing transformation of irrigation systems from flood to drip irrigation. Our simulations highlight three major implications of the irrigation transformation for groundwater resources. First, the transformation from flood to drip irrigation reduces the recharge fraction (19% vs. 16%) and especially the nitrogen leaching fraction (33% vs. 18%) on the long term. Second, the long-term performance of the two irrigation practices is subject to substantial inter-annual differences controlled by precipitation variability. The sensitivity of recharge and nitrogen leaching to annual meteorological conditions is stronger in drip irrigation, which eventually leads to a similar performance of flood and drip irrigation in wet years if fertilizer inputs are similar. Third, we identify a pronounced year-to-year nitrogen memory in the soil, whereby an enhanced (decreased) nitrogen leaching is observed after anomalously dry (wet) years, affecting the performance of irrigation-fertilizer practices. Overall, the study demonstrates the highly variable nature of the performance of irrigation-fertilizer practices, and the major findings can guide future efforts in designing sustainable water management strategies for agricultural areas with a Mediterranean climate.
    MeSH term(s) Agricultural Irrigation ; Agriculture ; Ecosystem ; Fertilizers/analysis ; Floods ; Groundwater ; Nitrogen/analysis ; Soil ; Water
    Chemical Substances Fertilizers ; Soil ; Water (059QF0KO0R) ; Nitrogen (N762921K75)
    Language English
    Publishing date 2022-02-11
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2022.153805
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 949: Show issues Location:
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    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  4. Article: Explaining the hydrological behaviour of facultative phreatophytes using a multi-variable and multi-objective modelling approach

    Puertes, Cristina / Lidón, Antonio / Echeverría, Carlos / Bautista, Inmaculada / González-Sanchis, María / del Campo, Antonio D / Francés, Félix

    Journal of hydrology. 2019 May 11,

    2019  

    Abstract: Trees in semi-arid conditions survive despite water scarcity and shallow soils because they commonly have access to subsoil water resources. Currently, conventional models do not include groundwater transpiration and the results frequently underestimate ... ...

    Abstract Trees in semi-arid conditions survive despite water scarcity and shallow soils because they commonly have access to subsoil water resources. Currently, conventional models do not include groundwater transpiration and the results frequently underestimate the actual evapotranspiration and overestimate the net recharge. Therefore, in this work we focus on how a multi-variable calibration with a multi-objective approach may improve model robustness leading to a more realistic closure of the water balance in two models (LEACHM and TETIS) of different conceptualisation taking into account the specific characteristics of a facultative phreatophytic forest. The results suggest that the common single-variable and single-objective calibration is not able to measure all system’s characteristics. However, the multi-variable and multi-objective calibration proved a good option to reproduce the water dynamics of a facultative phreatophytic forest and confirmed that groundwater transpiration is an important water source for them. Therefore, hydrological models should include this mechanism and both LEACHM and TETIS proved an acceptable tool to be applied in the regions covered by this species.
    Keywords evapotranspiration ; forests ; groundwater ; hydrologic models ; phreatophytes ; semiarid zones ; subsoil ; subsoiling ; transpiration ; trees ; water shortages
    Language English
    Dates of publication 2019-0511
    Publishing place Elsevier B.V.
    Document type Article
    Note Pre-press version
    ZDB-ID 1473173-3
    ISSN 0022-1694
    ISSN 0022-1694
    DOI 10.1016/j.jhydrol.2019.05.041
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: Impact of a transformation from flood to drip irrigation on groundwater recharge and nitrogen leaching under variable climatic conditions

    Pool, Sandra / Francés, Félix / Garcia-Prats, Alberto / Puertes, Cristina / Pulido-Velazquez, Manuel / Sanchis-Ibor, Carles / Schirmer, Mario / Yang, Hong / Jimenez-Martinez, Joaquin / id_orcid:0 000-0002-2063-6490

    Science of The Total Environment, 825

    2022  

    Abstract: The sustainability of agriculture in the Mediterranean climate is challenged by high irrigation water demands and nitrogen fertilizer losses to the environment, causing significant pressure on groundwater resources and groundwater-dependent ecosystems. ... ...

    Abstract The sustainability of agriculture in the Mediterranean climate is challenged by high irrigation water demands and nitrogen fertilizer losses to the environment, causing significant pressure on groundwater resources and groundwater-dependent ecosystems. Advanced irrigation technologies and improved fertilizer management have been promoted as key solutions to reduce the agricultural impact on aquatic systems. However, it remains unclear how different irrigation-fertilizer practices perform on the long-term under a highly variable climate, such as the Mediterranean one. Here, we conduct hydrological simulations over a fifty-year period to quantify the magnitude and dynamics of groundwater recharge and nitrogen leaching under five real-case irrigation-fertilizer practices observed in Valencia (eastern Spain). The Valencian Region is the largest citrus-producing region of Europe and current irrigation-fertilizer practices reflect the ongoing transformation of irrigation systems from flood to drip irrigation. Our simulations highlight three major implications of the irrigation transformation for groundwater resources. First, the transformation from flood to drip irrigation reduces the recharge fraction (19% vs. 16%) and especially the nitrogen leaching fraction (33% vs. 18%) on the long term. Second, the long-term performance of the two irrigation practices is subject to substantial inter-annual differences controlled by precipitation variability. The sensitivity of recharge and nitrogen leaching to annual meteorological conditions is stronger in drip irrigation, which eventually leads to a similar performance of flood and drip irrigation in wet years if fertilizer inputs are similar. Third, we identify a pronounced year-to-year nitrogen memory in the soil, whereby an enhanced (decreased) nitrogen leaching is observed after anomalously dry (wet) years, affecting the performance of irrigation-fertilizer practices. Overall, the study demonstrates the highly variable nature of the performance of irrigation-fertilizer ...
    Keywords Agriculture ; Irrigation and nitrogen management practices ; Climate sensitivity ; Precipitation variability ; Fertigation ; Mediterranean climate
    Subject code 550 ; 571
    Language English
    Publishing date 2022-06-15
    Publisher Elsevier
    Publishing country ch
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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