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Wood Pastures: Drivers for Ecological Sustainability and Conservation Management

A special issue of Sustainability (ISSN 2071-1050). This special issue belongs to the section "Sustainability, Biodiversity and Conservation".

Deadline for manuscript submissions: closed (30 June 2022) | Viewed by 10741

Special Issue Editors


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Leading Guest Editor
Department of Crop Production and Projects of Engineering, University of Santiago de Compostela, Campus Terra, 27002 Lugo, Spain
Interests: forest ecology; grazing ecology; secondary metabolism (vascular plants, terpenoids, tannins); chemical ecology

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Assistant Guest Editor
Department of Functional Biology (Ecology Section), University of Santiago de Compostela, Campus Terra, 27002 Lugo, Spain
Interests: ecology; environmental management; social-ecosystems; sustainability; sustainable land and territory management; landscape economics
Special Issues, Collections and Topics in MDPI journals

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Assistant Guest Editor
Department of Zoology, Genetics and Physical Anthropology (Zoology Section), University of Santiago de Compostela, Campus Terra, 27002 Lugo, Spain
Interests: animal ecology; biodiversity and conservation; soil fertility; invertebrate zoology

Special Issue Information

Dear Colleagues,

We are launching a Special Issue on wood pastures, focused on conservation management and potential drivers of biodiversity. Forest lands have been historically grazed; however, agricultural intensification and human abandonment of rural areas have set wood pastures aside. In recent times, extensive grazing has gained popularity mainly from an increase of social demand towards a more friendly and sustainable production of foodstuffs (e.g., organic farming)—this includes the practice of grazing in wood pastures, which is expected to grow.

Wood pastures hold exceptional ecological, social, and cultural values. An approach through conservation management is crucial, and should respond to how we proceed to sustain biological diversity. Assuming that the objective is to balance commodity production with maintenance of biological diversity and landscape sustainability, how do we visualize future landscapes? Recent literature situates the anthropogenic character of wood pastures requiring multifunctional land management as a major conservation challenge.

Numerous elements functioning at different spatial scales join to create and maintain biodiversity in terrestrial ecosystems. Interactions among organisms maintain diversity, and disturbances may reduce the ability of one or a few species to dominate others. For example, plant diversity is linked in a great extent to the degree and frequency of disturbance and, in low heathlands, is maintained through the traditional uses of grazing, cutting, or burning. There is a need, however, for studies on the response of woodlands to different frequencies of disturbance. Although current literature about wood pastures provides a perspective of their ecological and social-cultural dimension and outlines management challenges, studies on the dynamic of processes under conservation management in these ecosystems are scarce.

We call for contributions on the importance of the co-evolutionary balance of plants/herbivores and their role in favoring biodiversity. Herbivores are influenced by plant traits, which include the nutritional quality of plant tisssues, secondary metabolites that either are toxic or reduce the digestibility of their nutritional resources; by predators; and by the abundance of food. Concentrations of nutrients and plant secondary metabolites (PSM) vary temporally and spatially, creating a multidimensional feeding environment. Research has relied largely on studying the isolated effects of nutrients or PSM on foraging behavior, so their interaction is poorly understood, and yet it can influence food selection and the dynamics of plant communities. Negative effects, or poor achievement of targets, can arise from inappropriate grazing, and deciding on optimum grazing regimes and grazing densities highly depend on these indicators.

Among influential management interventions driving the structure and dynamics of wood pastures, grazing is not unique. Studies on forestry practices to provide understanding of the ecological conditions facilitating sustainability of wood pastures would be also welcome. Gap-driven forest/agricultural landscapes maintain certain natural structure and (in addition) protect soils (i.e., the importance of ecotones). Maintaining aesthetics, preserving species, and protecting natural stabilizing mechanisms are all valid and not mutually exclusive arguments to address conservation management, and any other tactics to follow the common thread of maintaining (or restoring) natural diversity within the managed stand or landscape are welcome for this Special Issue.

Dr. Maria Pilar González-Hernández
Dr. Emilio  V. Carral  Vilariño
Dr. Teresa Rodríguez
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sustainability is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • grazing ecology
  • biodiversity
  • grazing capacity
  • key species
  • stand development
  • succession

Published Papers (5 papers)

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Research

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11 pages, 1612 KiB  
Article
Understory Clearing in Open Grazed Mediterranean Oak Forests: Assessing the Impact on Vegetation
by Marina Castro, João Paulo Castro and José Castro
Sustainability 2022, 14(17), 10979; https://0-doi-org.brum.beds.ac.uk/10.3390/su141710979 - 02 Sep 2022
Cited by 3 | Viewed by 1526
Abstract
Over recent years, rural abandonment and climate change have challenged grazed wooded landscapes in Mediterranean mountain regions. Fire hazard management procedures such as grazing, prescribed burning, or mechanical clearing must be adjusted to the new socioeconomic and environmental situation and according to the [...] Read more.
Over recent years, rural abandonment and climate change have challenged grazed wooded landscapes in Mediterranean mountain regions. Fire hazard management procedures such as grazing, prescribed burning, or mechanical clearing must be adjusted to the new socioeconomic and environmental situation and according to the context and circumstances of each territory. This study contributes to adjusting vegetation management techniques in response to low grazing pressure by evaluating the combined effect of mechanical clearing and grazing on the structural and floristic dynamics of understory vegetation in the open-grazed Mediterranean oak forests of northern Portugal. To this end, three treatments were established: mechanical clearing with grazing, mechanical clearing without grazing, and grazing without clearing (the control). The floristic inventories were carried out using the point quadrat method, and the structure was evaluated using line transects. Herbaceous biomass was determined by destructive methods. This study shows that mechanical vegetation clearing effectively reduces phytovolume and, thus, fire hazards. However, for its effects to endure, it must be combined with subsequent grazing, which does not always occur. No consistent pattern was found in the floristic dynamics of the shrub-grassland mosaic (species richness and diversity) related to shrub-clearing or grazing over the short term (24 months). Full article
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20 pages, 9057 KiB  
Article
Climate Change and Silvopasture: The Potential of the Tree and Weather to Modify Soil Carbon Balance
by Nuria Ferreiro-Domínguez, Francisco Javier Rodríguez-Rigueiro, Antonio Rigueiro-Rodríguez, María Pilar González-Hernández and María Rosa Mosquera-Losada
Sustainability 2022, 14(7), 4270; https://0-doi-org.brum.beds.ac.uk/10.3390/su14074270 - 04 Apr 2022
Cited by 6 | Viewed by 1778
Abstract
Silvopastoral systems play an important role in climate change mitigation, considering their effect on soil carbon sequestration. In silvopastoral systems, sewage sludge can be used as fertiliser, which is promoted by the Circular Economy Package of the European Commission. This study evaluates the [...] Read more.
Silvopastoral systems play an important role in climate change mitigation, considering their effect on soil carbon sequestration. In silvopastoral systems, sewage sludge can be used as fertiliser, which is promoted by the Circular Economy Package of the European Commission. This study evaluates the soil chemical properties (pH, carbon), tree growth (top height, canopy cover), and their interactions from 1998 to 2012 in a Pinus radiata D. Don silvopastoral system in northwest Spain. Nine fertilisation treatments were applied: three doses of sewage sludge (160, 320, and 480 kg total N ha−1) or no fertilisation, all with or without liming, and mineral fertiliser with no liming. Soil pH decreased over time due to cations extraction by trees and pine needles deposited in the understory. Tree growth increased light interception, decreasing soil carbon incorporation. The interannual variation of carbon also depended on weather conditions. Initially, fertilisation increased soil pH and carbon, but without compensating cations extraction over time. Therefore, it is advisable to apply amendments in the middle years of the plantation. Tree management is also needed to decrease competitiveness and enhance carbon incorporation. Moreover, control plots should be linked to the next CAP 2023–2027 eco-schemes accounting for soil carbon levels. Full article
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14 pages, 1939 KiB  
Article
Responses in Soil Carbon and Nitrogen Fractionation after Prescribed Burning in the Montseny Biosphere Reserve (NE Iberian Peninsula)
by Sangita Chowdhury, José Manjón-Cabeza, Mercedes Ibáñez, Christian Mestre, Maria José Broncano, María Rosa Mosquera-Losada, Josefina Plaixats and M.-Teresa Sebastià
Sustainability 2022, 14(7), 4232; https://0-doi-org.brum.beds.ac.uk/10.3390/su14074232 - 02 Apr 2022
Cited by 5 | Viewed by 1829
Abstract
Prescribed fire is one of the most widely-used management tools to recover encroached rangelands. Fire has been reported to cause changes in the soil physical and chemical properties. However, the legacy effects of former plant species on soil responses to fire remains unknown. [...] Read more.
Prescribed fire is one of the most widely-used management tools to recover encroached rangelands. Fire has been reported to cause changes in the soil physical and chemical properties. However, the legacy effects of former plant species on soil responses to fire remains unknown. The legacy effect of the former extant plant species on soil carbon (C) and nitrogen (N) fractionation distribution after prescribed burning in topsoil (0–5 cm and 5–10 cm) was investigated in Mediterranean shrublands in Montseny. We sampled soils under five vegetation patch types: Cytisus scoparius L., Calluna vulgaris L., Erica arborea L., Pteridium aquilinum L., and Cladonia biocrusts, pre- and post-burning. Multivariate analysis on soil C and N fractions showed that soils under the legume Cytisus and the biocrust were the most differentiated. Vegetation patch types tended to respond differently to burning, soils under Cytisus, Cladonia and Calluna showing the strongest response. Total C and N, and C and N in sand decreased after burning in the 0–5 cm soil layer. Conversely, C in silt, as well as N in clay and silt, increased with soil depth after burning. This study will be helpful for understanding ecological legacy effects and their possible consequences when planning prescribed burning. Full article
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22 pages, 3754 KiB  
Article
Estimating Energy Concentrations in Wooded Pastures of NW Spain Using Empirical Models That Relate Observed Metabolizable Energy to Measured Nutritional Attributes
by María Pilar González-Hernández and Juan Gabriel Álvarez-González
Sustainability 2021, 13(24), 13581; https://0-doi-org.brum.beds.ac.uk/10.3390/su132413581 - 08 Dec 2021
Viewed by 1841
Abstract
Wooded pastures serve as a traditional source of forage in Europe, where forest grazing is valued as an efficient tool for maintaining the diversity of semi-natural habitats. In a forest grazing setting with diverse diet composition, assessing the energy content of animal diets [...] Read more.
Wooded pastures serve as a traditional source of forage in Europe, where forest grazing is valued as an efficient tool for maintaining the diversity of semi-natural habitats. In a forest grazing setting with diverse diet composition, assessing the energy content of animal diets can be a difficult task because of its dependency on digestibility measures. In the present study, prediction equations of metabolizable energy (ME) were obtained performing stepwise regression with data (n = 297; 44 plant species) on nutritional attributes (Acid Detergent Fiber, lignin, silica, dry matter, crude protein, in vitro organic matter digestibility) from 20 representative stands of Atlantic dry heathlands and pedunculate oak woodlands. The results showed that the prediction accuracy of ME is reduced when the general model (R2 = 0.64) is applied, as opposed to the use of the specific prediction equations for each vegetation type (R2 = 0.61, 0.66, 0.71 for oak woodlands; R2 = 0.70 heather-gorse dominated heathlands, R2 = 0.41 continental heathlands). The general model tends to overestimate the ME concentrations in heaths with respect to the observed ME values obtained from IVOMD as a sole predictor, and this divergence could be corrected by applying the specific prediction equations obtained for each vegetation type. Although the use of prediction equations by season would improve accuracy in the case of a Winter scenario, using the general model as opposed to the prediction equations for Spring, Summer or Fall would represent a much smaller loss of accuracy. Full article
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Review

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18 pages, 1167 KiB  
Review
Livestock Management for the Delivery of Ecosystem Services in Fire-Prone Shrublands of Atlantic Iberia
by Rafael Celaya, Luis M. M. Ferreira, José M. Lorenzo, Noemí Echegaray, Santiago Crecente, Emma Serrano and Juan Busqué
Sustainability 2022, 14(5), 2775; https://0-doi-org.brum.beds.ac.uk/10.3390/su14052775 - 26 Feb 2022
Cited by 10 | Viewed by 2874
Abstract
In the northwest of the Iberian Peninsula, characterized by its humid climate, large rural areas are being abandoned, mostly in less-favoured areas covered by heathlands, which present a low nutritive quality for livestock production. The high combustibility of these shrublands is driving a [...] Read more.
In the northwest of the Iberian Peninsula, characterized by its humid climate, large rural areas are being abandoned, mostly in less-favoured areas covered by heathlands, which present a low nutritive quality for livestock production. The high combustibility of these shrublands is driving a high wildfire incidence with negative environmental and economic effects. In this review, some aspects on wildfire occurrence and the potential of grazing livestock to reduce woody phytomass and fire risk in heathland-dominated areas whilst maintaining quality production and preserving biodiversity are summarized. Heathlands may be partially improved—converted to grassland—to better meet animals’ nutritional requirements while acting as ‘natural’ firebreaks. The specific grazing behaviour offers the opportunity to combine different domestic herbivores (mixed grazing) to achieve sustainable systems utilizing heterogeneous resources. Cattle, sheep, goats, and horses may have a role in the provision of different ecosystem services such as food production and biodiversity conservation. Genotype x environment interactions shape the ability of animals to cope with poor vegetation conditions, with smaller species and breeds performing better than larger animals. Goats and horses are indicated to arrest woody encroachment. Sustainable grazing systems are affordable in heathland–grassland mosaics by selecting appropriate livestock species and breeds for quality production, thus favouring rural economies and lowering fire risk. Full article
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