Cecilio Oyonarte

Cecilio Oyonarte
Universidad de Almería | UAL · Department of Agronomy

About

75
Publications
18,698
Reads
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1,461
Citations
Citations since 2016
25 Research Items
910 Citations
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
Additional affiliations
May 1993 - present
Universidad de Almería
Position
  • Professor (Full)

Publications

Publications (75)
Preprint
One of the largest challenges with soil information around the world is how to harmonize archived soil data from different sources and how make it usable to extract knowledge. In Ecuador there have been two major projects that provided soil information, whose methodology, although comparable, did not coincide, especially regarding the structure of...
Article
Full-text available
Subterranean ventilation is a non-diffusive transport process that provokes the abrupt transfer of CO2 -rich air (previously stored) through water-free soil pores and cracks from the vadose zone to the atmosphere, under high-turbulence conditions. In dryland ecosystems, whose biological carbon exchanges are poorly characterized, it can strongly det...
Article
Full-text available
Water availability controls the functioning of dryland ecosystems, driving a patchy vegetation distribution, unequal nutrient availability, soil respiration in pulses, and limited productivity. Groundwater-dependent ecosystems (GDEs) are acknowledged to be decoupled from precipitation, since their vegetation relies on groundwater sources. Despite t...
Article
Full-text available
Aims This study investigates how precipitation, temperature and seasonality (as a proxy of plant productivity) affect the temporal and spatial variability of soil CO2 efflux in two dry semiarid grasslands with different degrees of land degradation. Methods We measured soil CO2 efflux over four years under plant, biological soil crust and bare soil...
Article
Full-text available
Globally, soils store two to three times as much carbon as currently resides in the atmosphere, and it is critical to understand how soil greenhouse gas (GHG) emissions and uptake will respond to ongoing climate change. In particular, the soil-toatmosphere CO2 flux, commonly though imprecisely termed soil respiration (RS), is one of the largest car...
Article
Full-text available
Plant and soil landscapes across bioclimatic belts and drainage basins were studied using georeferenced databases in arid lands of SE Spain, the driest area of Europe. The syntaxonomic system was used to analyze phytocenoses and bioclimatic belts, as well as the concept of potential natural vegetation (PNV), a common approach in many countries of c...
Article
Full-text available
Forest aboveground biomass (AGB) estimation over large extents and high temporal resolution is crucial in managing Mediterranean forest ecosystems, which have been predicted to be very sensitive to climate change effects. Although many modeling procedures have been tested to assess forest AGB, most of them cover small areas and attain high accuracy...
Article
Full-text available
Due to their large carbon storage capacity and ability to exchange subterranean CO 2 with the atmosphere, soils are key components in the carbon balance in semi-arid ecosystems. Most studies have focused on shallow (e.g., <30 cm depth) soil CO 2 dynamics neglecting processes in deeper soil layers where highly CO 2 -enriched air can be stored or tra...
Article
The metabolic activity of water-limited ecosystems is strongly linked to the timing and magnitude of precipitation pulses that can trigger disproportionately high (i.e., hot-moments) ecosystem CO 2 fluxes. We analyzed over 2-years of continuous measurements of soil CO 2 efflux (Fs) under vegetation (Fs veg) and at bare soil (Fs bare) in a water-lim...
Article
Full-text available
The soil CO2 efflux (Fs) remains the least constrained component of the terrestrial carbon cycle; its estimates are still largely uncertain, mainly because of its considerable variation related to the many factors that interact over different temporal and spatial scales. Therefore, our aims were to: (i) identify the biophysical factors that control...
Poster
Full-text available
Highlights: - Explored the variation of soil CO2 in relation to its biophysical drivers. - Used a top-down statistical analysis and a wavelet time-frequency decomposition. - Identified poorly regarded drivers of soil CO2 dynamics: microhabitat and wind. - Provided new insight into soil CO2 production and transport, and improves CO2 emission modelli...
Article
Full-text available
Currently, drylands occupy more than one-third of the global terrestrial surface and are recognized as areas vulnerable to land degradation. The concept of land degradation stems from the loss of an ecosystem's biological productivity due to long-term loss of natural vegetation or depletion of soil nutrients. Drylands' key role in the global carbon...
Article
Full-text available
To know and understand the spatial distribution of soil organic carbon (SOC) is the first step for management of this important pool in the global carbon cycle, and to develop actions to address climate change. The objective of this work was to generate maps of percent SOC across Andalucía through the use of consistent models, quantifying the assoc...
Article
Full-text available
The concept of land degradation stems from the loss of an ecosystem's biological productivity, which in turn relies on several degradation processes, such as long-term loss of natural vegetation, depletion of soil nutrients, soil compaction or water and wind erosion, to which drylands are especially vulnerable. Currently, drylands occupy more than...
Conference Paper
Full-text available
Challenges that humanity face in the Anthropocene require new conceptual frameworks to better understand the linkages and feedbacks between society and nature. The ecosystem services framework constitutes a powerful approach for understanding human dependence on both natural and societal capital. Currently, new operational frameworks are needed for...
Article
Our understanding of the spatial and temporal dynamics of soil CO2 pulses after rainfall events is still limited and thus, our capacity to predict the consequences of future changes in precipitation patterns for dryland soils. In this study we examined the response of soil CO2 pulses to rainfall size and pre-rain soil moisture conditions in a semia...
Article
Research on the subterranean CO2 dynamics has focused individually on either surface soils or bedrock cavities, neglecting the interaction of both systems as a whole. In this regard, the vadose-zone contains CO2-enriched air (ca.5% by volume) in the first meters, and its exchange with the atmosphere can represent from 10 to 90% of total ecosystem C...
Article
Occasional rain events occur over the dry season in semiarid ecosystems and cause immediate, large increases in the net CO2 efflux which gradually decrease over a few days following the rain event. In a semiarid grassland located in SE Spain, these precipitation pulses represent only 7% of dry season length but provoked approximately 40% of the car...
Chapter
Full-text available
The aim of the present study is to determine zonation units geared towards balancing conservation and development in the Cabo de Gata-Níjar Natural Park, an arid environment located in south-eastern Spain. Ecosystems were identified selecting the attributes that exert the strongest influence on ecosystem dynamics at three different spatial scales....
Article
No studies have proven the existence of soil assemblages typical of arid lands in Europe. This study was carried out in a representative territory of the SE part of the Iberian Peninsula, Almería province, which is the driest part of Europe, to determine if soils characteristic of arid lands are present. In order to analyse the spatial distribution...
Poster
Full-text available
1. One of the major anthropogenic disturbances associated to global change are land cover-land use changes (LCLUC). Although different applications have been developed with the aim to simulate future scenarios based on the LCLU changes occurred, little attention has been paid to develop tools for spatially interpreting such changes in concrete time...
Article
Managing soil carbon requires accurate estimates of soil organic carbon (SOC) stocks and its dynamics, at scales able to capture the influence of local factors on the carbon pool. This paper develops a spatially explicit methodology to quantify SOC stocks in two contrasting regions of southern Spain: Sierra Norte de Sevilla (SN) and Cabo de Gata (C...
Conference Paper
Full-text available
Climate change may alter soil ecosystem functioning, as assessed via the net carbon ecosystem exchange (NEE) with the atmosphere, assumed to be related to the balance of biological processes of photosynthesis (gross primary production) and ecosystem respiration. Recent studies in carbonate ecosystems show a contribution of subsoil ventilation (VE)...
Presentation
Full-text available
1. One of the major anthropogenic disturbances associated to global change are land cover-land use changes (LCLUC). Although different applications have been developed with the aim to simulate future scenarios based on the LCLU changes occurred, little attention has been paid to develop tools for spatially interpreting such changes in concrete time...
Article
Area-pedodiversity, area-vegetation diversity, area-bioclimatic belts, diversity and pedodiversity-vegetation diversity-bioclimatic diversity relationships were analyzed for the most arid region of Western Europe (SE Spain). The study is novel in that it analyzed these relationships using as operational geographic units (OGUs) the set of polygons b...
Article
Full-text available
Climate change may alter ecosystem functioning, as assessed via the net carbon (C) exchange (NEE) with the atmosphere, composed of the biological processes photosynthesis (GPP) and respiration (R eco). In addition, in semi-arid Mediterranean ecosystems, a significant fraction of respired CO2 is stored in the vadose zone and emitted afterwards by su...
Presentation
Full-text available
Eco-regionalización del territorio marroquí. La sectorización del paisaje bajo una perspectiva ecológica y socio-cultural permitiría orientar de una forma más eficiente las acciones de gestión tales como la restauración de paisajes degradados, el aprovechamiento sostenible de los recursos naturales, etc.
Conference Paper
In semiarid climates, water is the fundamental factor determining ecosystem productivity and thereby the capacity for carbon sequestration. Increased water use efficiency (WUE), the ratio of carbon dioxide assimilation (canopy photosynthesis, Pc) to water transpired (canopy evaporation, Ec), is assumed to be an adaptive strategy for sclerophyll shr...
Article
Full-text available
An important goal of conservation biology is the maintenance of ecosystem processes. Incorporating quantitative measurements of ecosystem functions into conser-vation practice is important given that it provides not only proxies for biodiversity patterns, but also new tools and criteria for management. In the satellite era, the translation of spect...
Chapter
Drylands are characterized by an aridity index (ratio of annual rainfall to potential evapotranspiration) lower than 0.65, and occupy nearly a third of the total land surface. Globally, the organic and inorganic carbon (C) storage in such water-limited systems is about 20–30% of the terrestrial global total. The total soil organic C (SOC) stored in...
Article
In the context of an ongoing monitoring study of the Cabo de Gata-Níjar Natural Park (SE of Spain), we explored the use of soil respiration as an indicator of ecosystem functioning reflecting changes in ecological processes in semiarid environments. With this purpose, we measured soil CO2 efflux in six different and representative ecosystems of the...
Article
Full-text available
The critical zone can store large amounts of CO2, showing soil CO2 increases with depth fluctuating from 0.04 to 13.0% by volume. This CO2 can be emitted to the atmosphere through soil ventilation, causing the loss of CO2 stored in the subterranean spaces. The implications of ventilation processes for regional CO2 budgets are still poorly known. He...
Article
The changing climate is affecting biological and physical processes occurring in the biosphere, including the biogeochemical cycles of water and carbon. The response of ecosystem carbon exchange to changes in temperature and the water balance is still very uncertain, a fact that highlights the need for research in order to understand the role of th...
Article
Full-text available
Implementación de un sistema de seguimiento para la evaluación de los efectos del cambio global sobre el funcionamiento de las áreas protegidas de Iberoamérica Este artículo presenta un proyecto para desarrollar un sistema de evaluación, seguimiento y alerta de las respuestas del fun-cionamiento ecosistémico ante el cambio global en seis áreas prot...
Article
The changing climate is affecting biological and physical processes occurring in the biosphere, including the biogeochemical cycles of water and carbon. The response of ecosystem carbon exchange to changes in temperature and the water balance is still very uncertain, a fact that highlights the need for research in order to understand the role of th...
Article
Full-text available
Recent studies of carbonate ecosystems suggest a possible contribution of subterranean ventilation to the net ecosystem carbon balance. However, both the overall importance of such CO2 exchange processes and their drivers remain unknown. Here we analyze several dry-season episodes of net CO 2 emissions to the atmosphere, along with soil and borehol...
Article
Full-text available
Two years of continuous measurements of net ecosystem exchange (NEE) using the eddy covariance tech-nique were made over a Mediterranean alpine shrubland. This ecosystem was found to be a net source of CO 2 (+ 52 ± 7 g C m −2 and + 48 ± 7 g C m −2 for 2007 and 2008) during the two-year study period. To understand the rea-sons underlying this net re...
Article
Full-text available
Monitoring changes in soil and vegetation is crucial in fragile Mediterranean semiarid environments. To identify early perturbation warnings using radiometric techniques, the spectral variability of the ecosystem components must be understood and the ranges of their natural variability established. This paper aims to assess the potential of hypersp...
Article
Climate change scenarios predict increases in temperature, changes in precipitation patterns and longer drought periods in most semi-arid regions of the world. Ecosystems in these regions are prone to land degradation which may be aggravated by climate change. Soil respiration is one of the main processes of loss of organic carbon from arid and sem...
Article
Full-text available
Two years of continuous measurements of net ecosystem exchange (NEE) using the eddy covariance technique were made over a Mediterranean alpine shrubland. These ecosystems are little studied, since they have little CO2 exchange potential. Nevertheless, their high susceptibility to environmental changes is far from being understood, introducing some...
Chapter
Full-text available
La productividad primaria neta (PPN) destaca como proceso ecológico básico que da soporte a la provisión de los servicios ecosistémicos, y es considerado como servicio soporte o intermedio. Bajo esta argumentación, la información referida al funcionamiento de los ecosistemas resulta clave en los procesos de toma de decisiones en la gestión del t...
Article
Full-text available
Question: What is the influence of management on the functioning of vegetation over time in Mediterranean ecosystems under different climate conditions? Location: Mediterranean shrublands and forests in SE Iberia (Andalusia). Methods: We evaluated the Normalized Difference Vegetation Index (NDVI) for the 1997-2002 time series to determine phenologi...
Article
Soil Fe oxides Occur in almost all soils and reflect different environmental conditions by the high variability of their mineralogy and concentration. Quantitatively determining this important pedogenic indicator enables diffuse reflectance spectroscopy (DRS) based on material-specific absorption characteristics. This paper presents a methodology t...
Article
Full-text available
En ecosistemas semiáridos mediterráneos la alta variabilidad espacial y la baja actividad de la vegetación hacen que las técnicas de teledetección multiespectrales presenten severas limitaciones en el estudio de variables como la cobertura vegetal. La cobertura vegetal está relacionada con la productividad del ecosistema y su cuantificación resulta...
Article
There is a need to develop operational land degradation indicators for large regions to prevent losses of biological and economic productivity. Disturbance events press ecosystems beyond resilience and modify the associated hydrological and surface energy balance. Therefore, new indicators for water-limited ecosystems can be based on the partition...
Article
Understanding soil processes is fundamental to the success of forest restoration programs. We compared different types of soils in Mediterranean mountain forests with respect to their edaphic environments and influence of vegetation cover and lithology. We then used this information to determine the suitability of current forest restoration program...
Article
Full-text available
La mayoría de las áreas protegidas del mundo carecen de un sistema de seguimiento y alerta con implicancias directas en la gestión. Este trabajo propone, a partir del caso del Parque Natural Cabo de Gata-Níjar, posibles aplicaciones de un sistema de seguimiento. El sistema está basado en la más moderna tecnología satelital y fue originalmente desa...
Article
The study of the organic matter is essential in areas with high degradation risks like the Mediterranean climate environments. The aim of this work is to establish the effect of the parent material, climate conditions and vegetation type on the evolution of the soil organic matter in different Mediterranean environments as an essential step for ass...
Conference Paper
Full-text available
Abstract The management of soils as potential carbon sinks relies on obtaining accurate estimates of current soil organic carbon (SOC) stocks, at scales able to capture the interaction of site-specific factors influencing the carbon pool. The purpose of this study was to develop a spatially explicit methodology to quantify the SOC stocks in two Spa...
Article
Soil organic matter is a key component in ecosystems, as it is the essential part of a set of relevant processes and constitutes an important carbon pool contributing to Global Change. The design of environmental monitoring programmes should include indicators of the current status of ecosystems, alerting to incipient changes in them. In this conte...
Article
A study was carried out on some basic characteristics of the organic matter in the surface horizons of soils from the two different geological (calcareous and acid metamorphic rocks) and ecological systems under a Mediterranean climate in Southeast Spain. The results show some noticeable differences in soil organic matter composition. This is likel...
Article
The organic matter of the surface horizons of soils developed below scrub vegetation in a Mediterranean semi-arid area of great environmental interest (Cabo de Gata-Níjar Natural Park, SE Spain) has been studied. The study mainly concentrates on examining the influence of two vegetation types, one evolved (according to its successional stage), and...
Article
Full-text available
We characterized the spatial variability and temporal dynamics of the photosynthetic active radiation absorbed (APAR) by the canopy, a descriptor of ecosystem functioning, in Cabo de Gata – Níjar Natural Park (CGNNP) (Spain). Ecosystem functioning was characterized for five landscape classes using the Normalized Difference Vegetation Index (NDVI) d...
Article
Full-text available
La incorporación de atributos relacionados con el funcionamiento de las unidades ambientales permite una mejor clasificación del territorio, a la vez que facilita su seguimiento mediante telede-tección, al detectar con mayor rapidez los cambios, y aporta información relevante para su manejo. La integral anual del Índice Verde Normalizado (NDVI-I),...
Article
Full-text available
La incorporación de atributos relacionados con el funcionamiento de las unidades ambientales permite una mejor clasificación del territorio, a la vez que facilita su seguimiento mediante teledetección, al detectar con mayor rapidez los cambios, y aporta información relevante para su manejo. La integral anual del Índice Verde Normalizado (NDVI-I), c...
Article
Full-text available
El cambio global, a través de las modificaciones en el clima y en el uso del suelo, afectará de forma importante a la biodiversidad. El ecosistema se revela como una escala adecuada para el estudio de estas transformaciones. En este artículo presentamos los trabajos que actualmente estamos llevando a cabo para documentar los patrones espaciales y t...