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The dehesas are one of the most unique and characteristic landscapes of the Extremadura region. Together with their natural values, they are an environment in which trades, knowledge and ways of life rooted in the tradition of rural communities are still developed. However, ancestral knowledge and practices are in danger of disappearing. Faced with this problem, this study is focused on the benefits of tourism, using sustainability criteria to evaluate their ability to educate and to increase awareness and sensitivity of the importance of maintaining this intangible cultural legacy. Based on this premise, the main objective is to determine and analyze tourists' evaluations of the traditional shepherd's trade and the educational possibilities of agritourism experiences. For this purpose, a survey was carried out among 102 tourists who visited different cheese dairies in an Extremadura region that offers agritourism experiences. In addition, this work also aims to know the current situation of the shepherd's trade, identifying the benefits of its conservation and determining the threats that hinder its preservation. It also seeks to determine the solutions that could safeguard it. To this end, the Delphi method was used and 26 experts, mainly shepherds and shearers, were interviewed. The results reveal that tourists can identify the educational and cultural functions associated with pastoralism. They also recognize increased curiosity, empathy and environmental awareness as the main benefits derived from the tourism experience. The interviews reveal the suitability of disseminating the heritage and educational value of the dehesa through sustainable tourism experiences to increase interest in the rural world, revalue ancestral knowledge and contribute to its preservation. [ABSTRACT FROM AUTHOR]

Bullfighting tourism is a recent tourism modality that is in constant growth, and which consists of visits to bullfighting ranches with the aim of showing what life is like for this animal in its natural habitat. This activity represents a source of extra income for many breeders, but it has not yet been adequately promoted and publicized. This study analyzes the supply side of this type of tourism. For this purpose, a non-parametric statistical model has been used and results have been obtained which corroborate that the promotion of this type of tourism is scarce, and that the breeders began to offer this type of tourism to make known what life is like for the fighting bull in the countryside and to increase their income. Furthermore, in this study, it is fundamental to differentiate between bullfighting and bullfighting tourism so that this type of tourism can reach the greatest possible number of people and not be influenced by thoughts against bullfighting, as they are different activities. [ABSTRACT FROM AUTHOR]

The dehesas are one of the most emblematic landscapes of the Extremadura region (Spain). Along with its natural values, it preserves a wide repertoire of knowledge and trades rooted in the history and tradition of rural communities. However, the knowledge and practices that have characterized life in this environment are currently under serious threat. Faced with this problem, this study was based on the premise that, for individuals to commit themselves to the care and transmission of heritage, it is first necessary for them to know, understand and value it. For this reason, the main objective was to determine the knowledge and appreciation of university students with respect to the dehesa and the ancestral practice of grazing. It also aimed to analyze which are the most valued methodologies, activities, and future strategies for understanding and preserving these cultural landscapes and their ancestral practices. To this end, 400 university students were surveyed, and various quantitative and qualitative analyses were carried out. Quantitative techniques include analyses based on weighted averages, contingency tables and the chi-square test, while qualitative techniques are based on word frequency analysis and inductive content analysis. Despite coming from an environment dominated by this landscape and being one of the few regions that still preserve the ancestral practice of pastoralism, the results corroborated the students' lack of understanding of the dehesa and the variety of uses it offers. In addition, it was evident that they have hardly frequented this landscape and have not participated in on-site educational experiences. It also revealed the importance of experiential and sensory activities in the understanding and appreciation of the rural environment and its traditions. The results can be useful for improving the design of educational tourism products based on intangible heritage. It can also be useful for adapting teaching strategies and activities to the level of knowledge and experiences of students, helping to ensure the success of the educational experience. [ABSTRACT FROM AUTHOR]

The wood borer Cerambyx welensii Küster is a key contributor to Quercus open woodland (dehesa) decline. Among other factors, olfactory and visual cues could influence host colonisation by this species. In this study, we investigated whether the physiological performance and morphological features of Q. suber trees under summer stress are affected by C. welensii infestation. Additionally, we analysed the relation between morpho-physiological variables and the emission of monoterpenes that potentially mediate host selection by C. welensii. Thirty-six Q. suber trees with known monoterpene emission profiles were selected: 18 trees highly visited by C. welensii, and 18 neighbouring trees not visited or at least not visibly damaged by this wood borer. For each tree, we assessed photosynthesis, stomatal conductance, and transpiration during the early evening, and also the perimeter and crown projection. Trees visited by C. welensii maintained higher photosynthetic activity than non-visited trees (1.5–2.15 times) from 19:35 to 20:45 h. Visited trees had larger perimeters and smaller crown projection area-to-perimeter ratios than non-visited trees. Results suggest that, under stress conditions, the physiological performance of trees infested by C. welensii could have favoured foliar emission of certain monoterpenes influencing intraspecific host selection by this species. [ABSTRACT FROM AUTHOR]

The serious socioeconomic problems faced by rural environments in general, and the agricultural sector in particular, in peripheral European territories since the end of the last century have led to depopulation phenomena, the abandonment of unique traditional uses, and the loss of cultural identity. The promotion of a well-understood agrotourism sector in these territories, as an income-diversifying activity that promotes a more sustainable tourism, is a measure widely applauded by the scientific community, which seeks to curb such problems and offer an opportunity to the inhabitants who are less and less dedicated to the much maltreated primary sector. However, it is crucial to know in a personalized way the value chain associated with agrotourism and in particular that linked to the Extremadura dehesa, especially when this has not traditionally been considered a tourist resource. This paper presents a recent bibliographical review regarding the potential of the Extremadura dehesa as a viable agrotourism resource. The lack of knowledge that the tourist offer has about agrotourism and the dehesa as a business niche and diversification of income, or the gap between some activities and the appropriate channels of the value chain, are some remarkable conclusions, coinciding with those of other authors and similar territories. [ABSTRACT FROM AUTHOR]

Dehesas constitute one of the most relevant and traditional landscapes of the Extremadura region. However, the supremacy given to the economic–productive functionality of agricultural territories over environmental and cultural sustainability leads to the devaluation and neglect of the heritage manifestations of the rural world. Based on this premise, this study aimed to understand the current situation of some of the traditional trades of the Extremadura pasture, assessing the benefits of their conservation and determining the possible threats that hinder their preservation. In addition, it sought to articulate a proposal for solutions aimed at safeguarding them. To this end, the Delphi method was used, and 20 experts were interviewed in depth, mainly cork and charcoal extractors. The results corroborate the existence of various problems faced by the traditional trades, which compromise the conservation of the identity of the rural population and the sustainability of the dehesa. To mitigate these tensions, it was concluded that there is a need to disseminate the heritage of the dehesa through educational and agrotourism experiences to promote an increase in tourist awareness, revalue ancestral knowledge, and contribute to the conservation of intangible assets. [ABSTRACT FROM AUTHOR]

Featured Application: Montado is an agro-silvo-pastoral ecosystem characteristic of the south of Portugal, which is called Dehesa in Spain. Due to the interactions between its fundamental components—soil, pasture, trees, and animals—it is considered a highly complex ecosystem. Therefore, there are no scientific works published in which these interactions are evaluated simultaneously. This review paves the way for carrying out work that integrates the four fundamental components, with the greatest need to study the effects of grazing animals on soil, pasture, and trees. Montado is an agro-silvo-pastoral ecosystem characteristic of the south of Portugal and called Dehesa in Spain. Its four fundamental components—soil, pasture, trees, and animals—as well as the climate make Montado a highly complex ecosystem. This review article provides an overview of the state of the art of Montado from the point of view of the agro-silvo-pastoral ecosystem and the scientific work carried out in this context. Thus, the aim is: (i) to describe and characterize the Montado ecosystem, as an agro-silvo-pastoral system; (ii) to reveal experimental tests carried out, technologies used or with the potential to be used in the monitoring of Montado; (iii) to address other technologies, carried out in similar and different agro-silvo-pastoral ecosystems from south Portugal. This review consists of three chapters: (a) components of Montado and their interactions; (b) advanced technologies for monitoring Montado; (c) grazing systems. No review article is known to provide an overview of Montado. Thus, it is essential to carry out research on grazing and its effects on the soil and pasture in the Montado ecosystem. [ABSTRACT FROM AUTHOR]

In Mediterranean climate regions, climate change is increasing aridity and contributing to the mortality rate of Quercus suber, reducing the success of reforestation efforts. Using and creating microclimates is a recommended climate adaptation strategy that needs research. Our hypothesis is that planting Q. suber in north-facing slopes and water lines results in a higher survival rate than those that are planted in ridges and south-facing slopes. Secondly, our hypothesis is that existing shrubs (in this case, Cistus ladanifer) can be used to create microclimatic sheltering and increase the survival of Q. suber plantations. In experiment 1, we tested the survival of Q. suber plantations in four different topographic conditions. For that, 80 Q. suber plants were planted over four different topographic conditions, where soil probes were installed to monitor soil moisture and temperature. Two years after, the results show an increased survival rate in the north-facing slope and water line when compared to the ridge area (p = 0.032). In experiment 2, we tested if planting in the shade of rows of C. ladanifer increases the survival rate of Q. suber plantations. For that, 1200 Q. suber plants were planted; 600 in a Montado open area with no shade and 600 under the shade of rows of C. ladanifer shrubs. A total of 17 months after plantation, there was a significantly higher survival rate of the shaded plants (p = 0.027). We conclude that microclimates created by topography and shrubs can have a significant impact on the survival of Q. suber plantations and discuss the situations in which these can apply. [ABSTRACT FROM AUTHOR]

The necessity for accurate biomass estimates is greater than ever for the sustainable management of forest resources, which is an increasingly pressing matter due to climate change. The most used method to estimate biomass for operational purposes is through allometric equations. Typically, each country develops their own models to be applied at the local scale because it is more convenient. But, for Quercus suber, a joint regional model can be more beneficial, since the species is distributed across the Mediterranean and is challenging to account for due to felling limitations and the nature of mature cork biomass itself. We found that these characteristics are reflected in the biomass datasets and compatibility was, perhaps, the largest impediment to such a model. The use of dummy variables to differentiate between countries, as well as compromises in the limits of biomass compartments, allowed us to develop two joint models to estimate aboveground biomass in Portugal, Spain and Tunisia. One model as a function of diameter and another as a function of diameter and total tree height. In addition, we developed a separate model for roots (modelling efficiency of fitting = 0.89), since it was not possible to assure additivity of the whole tree. All coefficients were estimated using Seemingly Unrelated Regressions (SUR) and model fitting assured additivity in the aboveground compartments—leaves and woody biomass (modelling efficiency of fitting = 0.89 and 0.93, respectively). This work proves that it is possible to have a biologically sound and efficient model for the three countries, despite differences in the observed allometric patterns. [ABSTRACT FROM AUTHOR]

This work aims to measure and value the ecosystem services of grasslands and croplands covered by pasture-based beef farms in Alentejo. It combines pixel-level data from the Portuguese Mapping and Assessment of Ecosystem Services study and farm-level data from 40 farms. Five ecosystem services were considered: soil protection, carbon sequestration, support to extensive animal production, plant food production and fiber production. Two different approaches for service quantification were used: an "average class" method and a "buffer" approach. Double counting issues were avoided by applying a specific methodology developed for this study. The results obtained were similar for both approaches in the case of grasslands, with an average value between 146 and 176 €/ha/year. For croplands, the average service value oscillated between 40 and 166 €/ha/year. Soil protection was the most valuable service, with over 90% of the total value. Extrapolating these results for the entire region, the five ecosystem services were estimated to be worth between 173 M€ (class method) and 223 M€ (buffer approach). These results suggest that pasture-based beef farms in Alentejo help to provide a significant number of ecosystem services with positive environmental effects that are currently not remunerated by the market. [ABSTRACT FROM AUTHOR]

The dehesa is one of the main agricultural landscapes in the Extremadura region. It is currently undergoing a production crisis caused by changes in the market, including the abandonment of uses linked to its exploitation. This situation could lead to the disappearance of this unique landscape due to its anthropogenic nature. It is therefore necessary to develop alternative activities to improve its productive profitability, which could include sustainable hunting. The hunting literature recognizes the role it plays in environmental, economic, and social sustainability, with hunting tourism being one of the productive activities that generates the most wealth within the sector, where big game hunting is of great importance. In this scenario, the regions of Villuercas-Ibores-Jara and La Siberia have an ideal landscape for the development of this modality due to their physical characteristics. For this reason, this study carried out an analysis of the situation of hunting tourism in these areas through the dissemination of a questionnaire among the managers of rural accommodation in the study area. The responses recorded were processed using statistical techniques that allowed us to extract interesting results such as the importance of hunting as a tourist resource, with a large number of big game species living in these areas, the high presence of hunters in these lodgings during the hunting season, the role that hunting plays in environmental, economic, and social sustainability, and the need to create a specific tourist product that meets the needs of the demand of hunters. [ABSTRACT FROM AUTHOR]

'Tree-pasture' silvopastoral systems have the potential to become transformative multifunctional landscapes that add both environmental and economic value to pastoral farms. Nevertheless, no published study has found increased pasture production under mature silvopastoral trees in New Zealand hill country. This study takes a novel approach to silvopastoral research in New Zealand, and investigates a genus that has similar bio-physical attributes to other global silvopastoral trees that have been shown to increase pasture production under their canopies, with the aim of finding a silvopastoral genera that can increase pasture production under tree canopies compared to open pasture in New Zealand. This study measures pasture and soil variables in two pasture positions: under individually spaced native kānuka (Kunzea spp.) trees (kānuka pasture) and paired open pasture positions at least 15 m from tree trunks (open pasture) at two sites over two years. There was 107.9% more pasture production in kānuka pasture positions. The soil variables that were significantly greater in kānuka pasture were Olsen-P (+115.7%, p < 0.001), K (+100%, p < 0.001), Mg (+33.33%, p < 0.01), Na (+200%, p < 0.001) and porosity (+8.8%, p < 0.05), and Olsen-P, porosity and K best explained the variation between kānuka pasture and open pasture positions. Volumetric soil moisture was statistically similar in kānuka pasture and open pasture positions. These results are evidence of nutrient transfer by livestock to the tree-pasture environment. Furthermore, as there was a significantly greater porosity and 48.6% more organic matter under the trees, there were likely other processes also contributing to the difference between tree and open pasture environments, such as litterfall. These results show that kānuka has potential to increase pasture production in New Zealand hill country farms and create multifunctional landscapes enhancing both production and environmental outcomes in pastoral farms. [ABSTRACT FROM AUTHOR]

The dehesa is an anthropic complex ecosystem typical of some areas of Spain and Portugal, with a key role in soil and biodiversity conservation and in the search for a balance between production, conservation and ecosystem services. For this reason, it is essential to have tools that allow its characterization, as well as to monitor and support decision-making to improve its sustainability. A multipurpose and scalable tool has been developed and validated, which combines several low-cost technologies, computer vision methods and RGB aerial orthophotographs using open data sources and which allows for automated agroforestry inventories, identifying and quantifying units with important ecological significance such as: trees, groups of trees, ecosystem corridors, regenerated areas and sheets of water. The development has been carried out from images of the national aerial photogrammetry plan of Spain belonging to 32 dehesa farms, representative of the existing variability in terms of density of trees, shrub species and the presence of other ecological elements. First, the process of obtaining and identifying areas of interest was automated using WMS services and shapefile metadata. Then, image analysis techniques were used to detect the different ecological units. Finally, a classification was developed according to the OBIA approach, which stores the results in standardized files for Geographic Information Systems. The results show that a stable solution has been achieved for the automatic and accurate identification of ecological units in dehesa territories. The scalability and generalization to all the dehesa territories, as well as the possibility of segmenting the area occupied by trees and other ecological units opens up a great opportunity to improve the construction of models for interpreting satellite images. [ABSTRACT FROM AUTHOR]

Holm oak is a key tree species in Mediterranean ecosystems, whose populations have been increasingly threatened by oak decline syndrome, a disease caused by the combined action of Phytophthora cinnamomi and abiotic stresses. The aim of the present study was to produce holm oak plants that overexpress the Ginkbilobin-2 homologous domain gene (Cast_Gnk2-like) that it is known to possess antifungal properties. Proembryogenic masses (PEMs) isolated from four embryogenic lines (Q8, E2, Q10-16 and E00) were used as target explants. PEMs were co-cultured for 5 days with Agrobacterium EHA105pGnk2 and then cultured on selective medium containing kanamycin (kan) and carbenicillin. After 14 weeks on selective medium, the transformation events were observed in somatic embryos of lines Q8 and E2 and a total of 4 transgenic lines were achieved. The presence of the Cast_Gnk2-like gene on transgenic embryos was verified by PCR, and the number of transgene copies and gene expression was estimated by qPCR. Transgenic plants were obtained from all transgenic lines after cold storage of the somatic embryos for 2 months and subsequent transfer to germination medium. In an in vitro tolerance assay with the pathogen P. cinnamomi, we observed that transgenic plants were able to survive longer than wild type. [ABSTRACT FROM AUTHOR]

Dehesas or montados are man-made systems whose conservation interest as a Mediterranean landscape or agroforestry system has been highlighted in the scientific literature due to their high levels of biodiversity. The understanding of how management practices influence the biodiversity of the dehesa requires a comprehensive approach that considers the broad spectrum of biological components (i.e., fungi, lichens, vascular plants, macroinvertebrates, and vertebrates) that make the dehesa an ecosystem. We have reviewed around seventy publications compiled through Scopus and other specialized bibliographic sources not included in Scopus that study the impact of land use and land cover on the biodiversity of Iberian dehesas. The most significant results have been organized and summarized into a group of factors related to habitat structure and management practices. The conclusion to be drawn from the scientific studies is that not all biological components respond in the same way to land-cover and human practices, and the maintenance of a high overall diversity in dehesas depends on a complex understorey vegetation and habitat heterogeneity. [ABSTRACT FROM AUTHOR]

This work assesses damage caused by Coraebus undatus (Fabricius) (Coleoptera: Buprestidae) and Reticulitermes grassei Clément (Blattodea: Rhinotermitidae) in managed cork oak forests from the southern Iberian Peninsula. Lesions were diagnosed and quantified in relation to the following features: height and orientation in the trunk, diameter at breast height, solar exposure, understory presence and orography. The distribution patterns of lesions in the study area across 12 plots and in the trunk of the trees were also analyzed. The study was performed in "Sa de Hornachuelos" Natural Park (Córdoba, Spain) and the research area encompassed 12 environmentally-restored sampling plots. Data were recorded from 2007 to 2014, with yearly sampling from late June to mid-September, corresponding to the cork extraction period, since lesions caused by these insects are well distinguishable promptly after bark removal. The results reveal that C. undatus has low population levels and a non-uniform distribution pattern in the study area as well as in the trunk of the tree. It shows preference for medium height but not by any trunk orientation. R. grassei also shows low infestation levels and a preference to affect the trunk's base. Comparatively, C. undatus showed higher infestation levels than R. grassei. The location of damage was also different, since galleries made by C. undatus predominated at intermediate trunk heights while those of R. grassei were more frequent at lower heights. Our results further showed a low co-occurrence of both species in the same tree trunks, which could be explained in terms of overlapping in the distribution areas of both species. These results provide background information that will enable natural resources managers to detect changes and trends of these species and inform future management decisions. [ABSTRACT FROM AUTHOR]

Mediterranean oak savanna is composed of a mixture of scattered oak trees, crops, pasture, and shrubs. It is the most widespread agroforestry landscape in Europe, and its conservation faces multiple threats including water scarcity, which has been exacerbated by global warming and greater climate variability. Evapotranspiration (ET) can be used as a proxy of the vegetation water status and response to water shortage conditions, providing relevant information about the ecosystem stability and its hydrological dynamics. This study evaluates a framework to estimate ET at multiple spatial and temporal scales and applies it to the monitoring of the oak savanna vegetation water consumption for the years 2013–2015. We used a remote sensing-based energy balance model (ALEXI/DisALEXI approach), and the STARFM data fusion technique to provide daily ET estimates at 30 m resolution. The results showed that modeled energy balance components compared well to ground measurements collected by an eddy covariance system, with root mean square error (RMSE) values ranging between 0.60 and 2.18 MJ m−2 d−1, depending on the sensor dataset (MODIS or Landsat) and the flux. The daily 30 m ET series generated by STARFM presented an RMSE value of 0.67 mm d−1, which yielded a slight improvement compared to using MODIS resolution or more simple interpolation approaches with Landsat. However, the major advantage of the high spatio-temporal resolution was found in the analysis of ET dynamics over different vegetation patches that shape the landscape structure and create different microclimates. Fine-scale ET maps (30 m, daily) provide key information difficult to detect at a coarser spatial resolution over heterogeneous landscapes and may assist management decisions at the field and farm scale. [ABSTRACT FROM AUTHOR]

This study assesses the effects of environmental traits and landscape management on the biodiversity of saproxylic beetles from "dehesas" located in Sierra Morena Mountains (Córdoba, Southern Iberian Peninsula). The dehesa is an open savanna-like landscape with mature/old trees scattered on a pasture cover where both living and dead wood are of great importance for the maintenance of macroinvertebrate fauna. The study was carried out in five plots, with different environmental features and management. A total of 137 branches belonging to the four main tree species present in the area were collected, classified, and kept under four different thermal conditions. From January to June 2019, the adult emergences were followed. A total of 466 saproxylic specimens of 31 species were obtained, 5 of them included in red lists of protected fauna. Two Bostrichidae species (Lichenophanes numida Lesne and Scobicia pustulata Fab.) and two Cerambycidae (Chlorophorus ruficornis Oliv. and Trichoferus fasciculatus Faldermann) are included in the "European Red List of Saproxylic Beetles"; and the Clerid Tillus ibericus Bahillo de la Puebla, López–Colón and García–Paris, is included in the "Red Book of Invertebrate of Andalucía". Differences were observed regarding the diversity and abundance among the plots and among the tree species from which the beetles emerged. Simple regression analyses revealed negative relationships between tree density/Buprestidae, livestock/Bostrichidae, and land use/Cerambycidae. Multivariant logistic regression analysis did not find significant relationships among environmental traits and saproxylic diversity. Results confirmed that dry wood was a main resource for the maintenance dehesas' biodiversity because it constitutes an ecological niche exploited by a significant set of saproxylic beetles belonging to the Bostrichidae, Buprestidae, and Cerambycidae families, in addition to other guilds of species, mainly Carabidae and Cleridae, which feed on the above-mentioned groups. Our results also support that increasing environmental temperature accelerates the development of Buprestidae, but this effect was not evident for the Bostrichidae species. [ABSTRACT FROM AUTHOR]

Watering ponds are an important source of drinking water supply for livestock in semi-arid rangelands. Understanding the hydrological functioning of this kind of infrastructures is crucial for efficient water management in areas where water resources are often scarce. In this line, we have analyzed temporal patterns of water availability in a set of watering ponds located in Iberian rangelands and their relationship with temporal rainfall variability. In addition, the effectiveness of the ponds for conserving stored water during dry periods and some influencing factors (pond size and catchment area) have also been assessed. The results showed a high correlation between water availability and precedent rainfall, confirming, on the one hand, the capacity of storage of these infrastructures and, on the other hand, the importance of temporal rainfall patterns in their hydrological behavior. Our findings point to a minimum pond area of 2000 m2 and a catchment area/storage capacity ratio around 100 m−1 in order for watering ponds can face the dry summer period with certain guarantees, at least in regular hydrological years. Nonetheless, the vulnerability shown by the majority of the watering ponds in times of drought limits their usefulness as unique sources of water supply in many farms. [ABSTRACT FROM AUTHOR]

Simple Summary: This paper attempts to analyze the impact of organic livestock farming in dehesas through the analysis and review of the carbon footprint of seven extensive organic farming systems in various dehesas in the southwest of Spain. The method used was life cycle assessment, taking into account both greenhouse emissions and carbon sequestration. Greenhouse emissions estimated are those derived from livestock digestion, manure management, soil management, and off-farm inputs (feeding, fuels, and electricity). Carbon sequestration calculations consider carbon fixation due to pasture and crop waste and carbon fixation in soil due to manure fertilization. The farms under study represent all the species bred in the farms and all the habitual farming systems existing in dehesas, with the following types being under analysis: beef cattle, sheep for meat, Iberian pigs, and dairy goats. The emissions identified in the farms under study have been found to be lower than those from conventional farms, with values of 16.27 and 10.43 kg CO2eq/kg of live weight for beef cattle, 13.24 and 11.42 kg CO2eq/kg of live weight for sheep, 1.19 kg CO2eq/kg of milk for goats, and 4.16 and 2.94 kg CO2eq/kg of live weight for pigs. The levels of carbon sequestration are also noticeably higher, with compensation being up to 89% in meat producing ruminants' farms, 100% in dairy goats' farms, and values compensating the total emissions in the case of Iberian montanera pig farms. This study employs life cycle assessment (LCA) for the calculation of the balance (emissions minus sequestration) of greenhouse gas emissions (GHG) in the organic livestock production systems of dehesas in the southwest region of Spain. European organic production standards regulate these systems. As well as calculating the system's emissions, this method also takes into account the soil carbon sequestration values. In this sense, the study of carbon sequestration in organic systems is of great interest from a legislation viewpoint. The results reveal that the farms producing meat cattle with calves sold at weaning age provide the highest levels of carbon footprint (16.27 kg of carbon dioxide equivalent (CO2eq)/kg of live weight), whereas the farms with the lowest levels of carbon emissions are montanera pig and semi-extensive dairy goat farms, i.e., 4.16 and 2.94 kg CO2eq/kg of live weight and 1.19 CO2eq/kg of fat and protein corrected milk (FPCM), respectively. Enteric fermentation represents 42.8% and 79.9% of the total emissions of ruminants' farms. However, in pig farms, the highest percentage of the emissions derives from manure management (36.5%–42.9%) and animal feed (31%–37.7%). The soil sequestration level has been seen to range between 419.7 and 576.4 kg CO2eq/ha/year, which represents a considerable compensation of carbon emissions. It should be noted that these systems cannot be compared with other more intensive systems in terms of product units and therefore, the carbon footprint values of dehesa organic systems must always be associated to the territory. [ABSTRACT FROM AUTHOR]

Tree–grass ecosystems are widely distributed. However, their phenology has not yet been fully characterized. The technique of repeated digital photographs for plant phenology monitoring (hereafter referred as PhenoCam) provide opportunities for long-term monitoring of plant phenology, and extracting phenological transition dates (PTDs, e.g., start of the growing season). Here, we aim to evaluate the utility of near-infrared-enabled PhenoCam for monitoring the phenology of structure (i.e., greenness) and physiology (i.e., gross primary productivity—GPP) at four tree–grass Mediterranean sites. We computed four vegetation indexes (VIs) from PhenoCams: (1) green chromatic coordinates (GCC), (2) normalized difference vegetation index (CamNDVI), (3) near-infrared reflectance of vegetation index (CamNIRv), and (4) ratio vegetation index (CamRVI). GPP is derived from eddy covariance flux tower measurement. Then, we extracted PTDs and their uncertainty from different VIs and GPP. The consistency between structural (VIs) and physiological (GPP) phenology was then evaluated. CamNIRv is best at representing the PTDs of GPP during the Green-up period, while CamNDVI is best during the Dry-down period. Moreover, CamNIRv outperforms the other VIs in tracking growing season length of GPP. In summary, the results show it is promising to track structural and physiology phenology of seasonally dry Mediterranean ecosystem using near-infrared-enabled PhenoCam. We suggest using multiple VIs to better represent the variation of GPP. [ABSTRACT FROM AUTHOR]