Maria Conceição Gonçalves

Maria Conceição Gonçalves
Instituto Nacional de Investigação Agrária e Veterinária (INIAV) | INRB · Sistemas agrários e Florestais e sanidade vegetal - Soils Laboratory

Researcher

About

74
Publications
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1,143
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Publications

Publications (74)
Conference Paper
Full-text available
The short review reports a selection of innovations that successfully countered soil salinisation. We reviewed different case studies at the farm-level, in order to be able to identify strategies and define a framework to deal with soil salinisation in Europe.
Article
Full-text available
Hydrological modeling is nowadays critical for evaluating the status, past trends, and future perspectives of water availability at the global, regional, and local scales. The Iberian Peninsula is registering more frequent and severe droughts and water scarcity caused not only by extreme meteorological events, but also by increased demand for water...
Chapter
This research aims to explore the effects of magnetized waters on spinach matador (Spinacia oleracea L) growth and soil characteristics. Under the pot experiment, two levels of salinity were applied; 0.2 (tap water) and 2.2 g/L (tap water + NaCl). The irrigation waters were treated thanks to a magnetic treatment device of 13.5 mT. The relative grow...
Conference Paper
Full-text available
Electromagnetic conductivity imaging (EMCI) is a state-of-the-art methodology for soil salinity assessment over large areas. It involves the following rationale: (1) use of the electromagnetic induction (EMI) geophysical technique to measure the soil apparent electrical conductivity (EC a , mS m −1) over an area; (2) inversion of EC a to obtain EMC...
Article
Lezíria Grande is an important agricultural area in Portugal, prone to waterlogging and salinity problems due to the influence of estuarine tides on groundwater dynamics. Simple, non-invasive, practical approaches are need for monitoring soil salinity in the region and preventing further degradation of soil resources. The objective of this study wa...
Article
Full-text available
Lezíria Grande de Vila Franca de Xira, located in Portugal, is an important agricultural system where soil faces the risk of salinization due to climate change, as the level and salinity of groundwater are likely to increase as a result of the rise of the sea water level and consequently of the estuary. These changes can also affect the salinity of...
Article
Full-text available
The mitigation of soil salinization and/or sodicization phenomena are considered one of the main challenges of irrigated agriculture. In Portugal, Lezíria Grande of Vila Franca de Xira is a region with increased salinization and sodicization risks due to the influence of tidal movement on groundwater. This study aimed to evaluate soil water and sal...
Article
Full-text available
Modeling soil hydraulic properties requires an effective representation of capillary and noncapillary storage and conductivity. This is made possible by using physically comprehensive yet flexible soil hydraulic property models. Such a model (Brunswick [BW] model) was introduced by Weber et al. (2019, https://doi.org/10.1029/2018WR024584), and it o...
Chapter
Full-text available
This minipaper assesses the strategies that can be used to prevent, reduce or adapt to soil salinity at farm level, identifying their sustainability and innovation potential. We begin with a resume of the available strategies and then present the strategies with high innovation potential discussing their limits and advantages, challenges and opport...
Article
The mitigation of soil salinization and/or sodicization phenomena are considered one of the main challenges of irrigated agriculture. In Portugal, Lezíria Grande of Vila Franca de Xira is a region with increased salinization and sodicization risks due to the influence of tidal movement on groundwater. This study aimed to evaluate soil water and sal...
Article
Salt related problems in soils can refer to an excess of soluble salts (saline soils), a dominance of exchangeable sodium in the soil exchange complex (sodic soils), or a mixture of both situations (saline-sodic soils). These categories are important because the impacts and management vary accordingly. Electromagnetic induction (EMI) methods and in...
Preprint
Full-text available
Abstract. Lezíria Grande of Vila Franca de Xira, located in Portugal, is an important agricultural system where soil faces the risk of salinization, being thus prone to desertification and land abandonment. Soil salinity can be assessed over large areas by the following rationale: (1) use of electromagnetic induction (EMI) to measure the soil appar...
Chapter
Weather extreme events raise concerns about the sustainable use of resources in agriculture. Inter- and intra-annual variability in temperature and precipitation leads to increasing water scarcity. In fact, water is a scarce resource in Mediterranean regions, a problem that tends to intensify with global warming. Higher atmospheric evaporative dema...
Article
Soil salinization limits agricultural productivity and can ultimately cause desertification and land abandonment. Traditionally soil salinity is assessed using soil sampling methods for laboratory determinations. These are not representative of soil properties at management scales and are highly time and work consuming, resulting in costly surveys....
Article
Soil salinization limits agricultural productivity and can ultimately cause desertification and land abandonment. One approach to assess soil salinity over large areas efficiently is to use electromagnetic instruments to measure the soil apparent electrical conductivity (ECa – mS/m). ECa data can be then inverted to generate electromagnetic conduct...
Article
Deficit irrigation practices carried out in very high-density olive orchards grown in the Alentejo region of southern Portugal can bring important economic benefits in terms of water savings, yields, and oils. They can also result in serious salinization/sodification problems without proper management of soil and water resources. The main objective...
Article
Full-text available
The Enxoé reservoir has been exhibiting frequent high chlorophyll-a concentrations (reaching a geometric mean six times the national limit for eutrophication of 10 μg L−1) since 2000, and represents the reservoir with the highest eutrophic state in Portugal. Toxic algal blooms have also been observed, which pose serious challenges to water managers...
Conference Paper
Full-text available
Drought severity in Southern Europe has increased in the last decades, as a consequence of global warming and climate projections for the 21st century point to an increase in the area affected by droughts in the Iberian Peninsula. Alentejo is one of the driest regions in Portugal where, presently, about 69% of the water withdrawals are from surfac...
Article
Full-text available
The Enxoé reservoir in southern Portugal has been exhibiting the highest trophic state in the country since its early years of operation. The problem has attracted water managers’ and researchers’ attention as the reservoir is the water supply for two municipalities. Extensive research was thus conducted over the last few years, including field mon...
Conference Paper
Full-text available
Salinization has been identified as a major cause of soil degradation in countries around the Mediterranean. Soil salinization limits agricultural productivity and can ultimately cause desertification and abandonment of the land. Salinization can also affect the quality of both ground and surface water resources, degrade infrastructures, and decrea...
Conference Paper
Full-text available
Recent research shows how soil information can be generated quickly and cheaply, by using a state-of-the-art electromagnetic (EM) instrument and the inversion method to generate high-resolution EM conductivity images (EMCI). EM instruments have the advantages of being faster, less expensive, and also to collect data easier than the common Electrica...
Article
Full-text available
The Enxoé Reservoir was built in 1998. Since 2000, it has exhibited frequent high chlorophyll-a concentrations, reaching a geometric mean three times higher than the national limit for eutrophication, presenting the reservoir with the highest eutrophic state in Portugal. Toxic algal blooms have also often been observed, which pose serious challenge...
Article
Full-text available
Legacy soil data have been produced over 70 years in nearly all countries of the world. Unfortunately, data, information and knowledge are still currently fragmented and at risk of getting lost if they remain in a paper format. To process this legacy data into consistent, spatially explicit and continuous global soil information, data are being res...
Article
Nowadays there is an increasing effort for raising global awareness for the importance of soils to ensure food security, to improve agricultural and environmental planning and monitoring, and to establish effective and sustainable land management policies to counteract soil degradation. This study presents the INFOSOLO legacy database as the first...
Article
Full-text available
Enxoé is a small temporary river with a flushy regime, which flash floods carry significant loads to the reservoir. As a result, the reservoir, which supplies 25,000 inhabitants, exhibits a high trophic state and cyanobacteria blooms since its construction in 1998, with water abstractions requiring extensive treatment. This study aimed to understan...
Article
Full-text available
Soil salinization is a major soil degradation process. In Portugal, this problem is limited to marshes and some irrigated areas located in the south of the country. However, the increase of the irrigated area and the prospects of climate change for the coming decades, including rising temperatures, can lead to an increase of the degraded areain Por...
Article
The temporal variability of particulate (POC) and dissolved (DOC) organic carbon concentrations was analyzed in the Enxoé temporary river, southern Portugal, between September, 2010 and August, 2013. The overall aim was to study the variability of those elements during storm events, and determine their origin and the main transfer mechanisms to the...
Article
Limited knowledge of the hydraulic properties of semi-arid Cape Verde soils makes the use of water balance models difficult. In this paper, the water retention characteristics of agricultural soils of Santiago Island and the development of point pedotransfer functions (PTFs) to improve irrigation management are investigated. Soil water retention cu...
Article
Hydrological modellers have recently been challenged to improve watershed models by better integrating soil information into model applications. Reliable soil hydraulic information is thus necessary for better describing the water balance components at the catchment scale. Frequently, that information does not exist. This study presents a set of cl...
Book
Full-text available
There is a common need for reliable hydropedological information in Europe. In the last decades research institutes, universities and government agencies have developed local, regional and national datasets containing soil physical, chemical, hydrological and taxonomic information often combined with land use and landform data. A hydrological datab...
Article
Soil salinization and non-point source pollution are among the most important and widespread environmental problems in European Mediterranean regions. Sweet sorghum (Sorghum bicolor (L.) Moench var. saccharatum) is a moderate to high salinity tolerant crop with low water and nutrient needs, seen as an alternative to grow in the water scarce regions...
Article
Full-text available
Diagnosing nutrient insufficiencies or toxicities in sorghum through foliar analysis is still scarce and mainly used for grain sorghum. The influence of the combinations of four nitrogen (N) rates with three sodium chloride (NaCl) rates on the leaf N, phosphorus (P), calcium (Ca), magnesium (Mg), potassium (K), and sodium (Na) concentrations of swe...
Article
The need for reducing irrigation water demand and non-point source pollution all across Europe has made sweet sorghum [Sorghum bicolor (L.) Moench], due to its lower water and nutrient requirements, an interesting alternative to other traditional summer crops in European Mediterranean regions. HYDRUS-2D was used to model the fate of nitrogen in a p...
Book
Full-text available
Population growth and increasing land use intensity lead to growing demands and exploitation of natural resources. Soils are among the most important and most endangered natural resource entities. In order to plan and implement sustainable soil management practices and to facilitate the rational exploitation of the resource, more detailed informati...
Article
Soil salinization, sodification, and non-point source pollution are among the most important and widespread environmental problems in agricultural regions with scarce water resources. Models evaluating these environmental problems should therefore consider an integrated approach to avoid favoring one problem over the other. The HYDRUS-1D software p...
Article
Soil texture influences significantly soil hydraulic properties, which due to soil heterogeneity normally present large spatial variability. The variability of soil retention θ(h), and hydraulic conductivity K(h) curves, in 11 of the 12 texture classes of the diagram of Gomes e Silva (1962) was studied. For each textural class, average, maximum, mi...
Article
Full-text available
We evaluated the influence of the combinations of four N levels with three NaCl levels, applied through irrigation, on leaf N, P, K, Ca, Mg, and Na concentrations of sweet sorghum (Sorghum bicolor ssp. saccharatum), in two consecutive years of an experiment established on a Eutric Fluvisol in Alvalade-Sado region, equipped with a drip irrigation sy...
Article
Full-text available
This work aims predicting salinization and sodification in two soils with different textures when they are irrigated with saline waters combined with different fertirrigation levels, and after the fall/winter rainfall washout of the soil. The electrical conduc­tivity of the saturation paste and of the soil solution was used as soil salinity indicat...
Article
Full-text available
Simulation results for water content distribution obtained with HYDRUS, RZWQM and MOHIDLAND models were compared with field data. These models differ mainly in calculating root water uptake and computing crop water requirements. Simulations were carried out in different horizons of an Hortic An-throsol and an Eutric Fluviosol, located in the Alente...
Article
In this study two methodologies were tested to assess soil erosion and land deserti­fication risks in Vale do Gaio watershed (513 km²), located in the Alentejo region. Cambisols, Luvisols, and Regosols are the dominant soils in the watershed. Oak tree Mediterranean woodland, Agricultural crops and pastures are the major land uses. Soil erosion risk...
Article
Salinization and nitrate leaching are two of the leading threats to the environment of the European Mediterranean regions. Inefficient use of water and fertilizers has led to a nitrate increase in the aquifers and reduction in crop yields caused by salts. In this study, a triple emitter source irrigation system delivers water, salt (Na+), and ferti...
Article
A caracterização de materiais sólidos recorrendo à espectrofotometria de absorção atómica com chama requer a dissolução total das amostras. Este pré-tratamento, para além de consumir tempo analítico, aumenta o risco de contaminações da amostra. Por esta razão, existe um interesse crescente em desenvolver processos analíticos mais eficientes, que te...
Article
Three soil lysimeters (A, B, and C) were built in a Fluvisol located in Alvalade-Sado (Alentejo). The soil lysimeters were irrigated from 2001 to 2005 with waters of different quality (May to August), and subjected to atmospheric conditions during the remaining months of the year. A total depth of 500 mm was applied every year in each soil lysimete...
Article
Numerical inversion of cumulative infiltration data during transient water flow, complemented with initial (?i) and final water content data (?f) of the infiltration process, is a new tool to define soil water retention ? (h) and hydraulic conductivity K(h) curves and to estimate the unknown parameters in Mualem-Van Genuchten`s model (M-vG) of the...
Article
Full-text available
Pedotransfer functions allow prediction of the soil hydraulic characteristics from basic soil data. In this study pedotransfer functions were developed in order to obtain three specific points of the soil water retention curve: field capacity, wilting point and maximum capacity, which were considered to be correspondent to the water held in soil ag...
Article
Full-text available
HYDRUS-1D was used to analyze water flow and solute transport in three soil monoliths (1.2 m² ? 1.0 m) that were irrigated during summer months with different quality waters. The soil monoliths were constructed on a Eutric Fluvisol in Alentejo, Portugal. EC of irrigation waters varied between 0.4 and 3.2 dS m-1 and SAR between 1 and 6 (meq L-1)0.5,...
Article
Full-text available
Some of the existing information available in the Soil Science Department of the Estação Agronómica Nacional, correspondent to 633 layers/horizons of 224 georreferenced soil profiles (WGS84), was organized in a relational database (PROPSOLO). The database, developed within the MySQL Relational Database Management System, has a relational structure...
Article
Two experimental fields in Herdade da Mitra and Alvalade do Sado, were installed in different soils, using conventional field operations. The crop was Zea Mays irrigated with a triple emitter source irrigation system. In this layout scheme there are 3 sources of water with different water quality: salty water (water source with NaCl dissolved), irr...
Article
Full-text available
A variety of analytical and numerical models have been developed during the past several decades to predict water and solute transfer processes between the soil surface and the groundwater table. While many models quantifying solute transport in soils usually consider only one solute and severely simplify various chemical interactions, others such...
Article
Full-text available
Many applications involving variably saturated flow and transport require estimates of the unsaturated soil hydraulic properties. Numerical inversion of cumulative infiltration data during transient flow, complemented with initial or final soil water content data, is an increasingly popular approach for estimating the hydraulic curves. In this stud...
Article
Mathematical models are often used to simulate water movement and transport of ions, through the soil profile, as a tool to implement better agricultural practices. The most important input data for such models are the unsaturated soil hydraulic properties, solute transport parameters, and adsorption isotherms, the latter relating the concentration...
Article
Full-text available
The Azores Islands are of recent volcanic origin and their soils, classified as Andosols, have characteristics peculiar to their formation and constituents. Several other areas in the world, including parts of Europe, have Andosols, but their hydraulic properties are not well known. To improve understanding of the hydrologic behaviour of these soil...