Search results for "Success"

Carbon dynamics of soil organic matter in bulk soil and aggregate fraction during secondary succession in a Mediterranean environment.

2013

Clarifying which factors cause an increase or decrease in soil organic carbon (SOC) after agricultural abandonment requires integration of data on the temporal dynamics of the plant community and SOC. A chronosequence of abandoned vineyards was studied on a volcanic island (Pantelleria, Italy). Vegetation in the abandoned fields was initially dominated by annual and perennial herbs, then by Hyparrhenia hirta (L.) Stapf, and finally by woody communities. As a consequence, the dominant photosynthetic pathway changed from C3 to C4 and then back to C3. Conversion of a plant community dominated by one photosynthetic pathway to another changes the 13C/12C ratio of inputs to SOC. Using the time si…

Litter contribution to soil organic carbon in the processes of agriculture abandon

2015

The mechanisms of litter decomposition, translocation and stabilization into soil layers are fundamental processes in the functioning of the ecosystem, as they regulate the cycle of soil organic matter (SOM) and CO2 emission into the atmosphere. In this study the contribution of litters of different stages of Mediterranean secondary succession on carbon sequestration was investigated, analyzing the role of earthworms in the translocation of SOM into the soil profile. For this purpose the δ13C difference between meadow C4-C soil and C3-C litter was used in a field experiment. Four undisturbed litters of different stages of succession (45, 70, 100 and 120 since agriculture abandon) were colle…

The effects of land abandonment and long-term afforestation practices on the organic carbon stock and lignin content of Mediterranean humid mountain …

2019

Afforestation is an important strategy that can decrease atmospheric carbon by sequestering carbon in biomass and soil. In Spain, an active afforestation programme was adopted in the 1950s when the soil was severely eroded after widespread abandonment of arable land. The Araguás catchment (Central Spanish Pyrenees) is a good example of this programme because it was afforested with both Pinus sylvestris L. (PS) and Pinus nigra J.F.Arnold (PN). The soil organic carbon (SOC) stock and lignin content (based on the vanillyl, syringyl and cinnamyl contents) of these afforested soils were examined and compared to those of bare soil, secondary succession and meadow soils. Both the SOC stock and lig…

Middle Eocene calcareous nannofossils in the Jaca transect (South-central Pyrenees Eocene Basin, Aragón river valley, Huesca)

2020

The calcareous nanoplankton is studied from the base of the turbidite systems of the Upper Hecho Group (Jaca Basin, middle Eocene of the South-central Pyrenean Basin) up to the Gracionepel instabilities, within the Larres slope Marls. This new chronostratigraphic contribution is of crucial importance for the improvement of the detailed temporal and spatial correlation framework of the genetically related depositional systems at basin scale. The calcareous nanofossil assemblage is largely dominated by Coccolithus pelagicus , C. formous as well as different species of Reticulofenestra , accompanied by occasional specimens of several species of Sphenolithus  and Chiasmolithus . The results obt…

Assessment of student engagement among junior high school students and associations with self-esteem, burnout, and academic achievement

2016

Journal for educational research online 8 (2016) 2, S. 136-157

Succession et remplacements de communautés à brachiopodes en régime de sédimentation discontinue (Jurassique Moyen, Bourgogne, France)

1993

Abstract Sequence stratigraphy throws a new and seminal light on the fossil record and helps in determining the respective role played by external control (community replacement) and internal control (paleoecological succession) in the temporal “train” of marine benthic paleocommunities. Five brachiopod-dominated communities (C1–C5) are recognized and their temporal “train” described, during the uppermost Bathonian-lower Callovian interval in Burgundy. The first series (C1–C3) exhibits a trend interpreted as a paleoecological succession and the next two (C3–C4, C4–C5) as community replacements. Within the scope of sequence stratigraphy, the paleoecological succession comes at the end of a t…

Customer Satisfaction and Quality Services in the Hotel Industry: A Strategic Approach

2018

In the hotel and hospitality industry, managers need to see quality as their main competitive advantage and need the acknowledge the ways in which quality can be used to drive competitiveness. As one of the most important aspects of hotel management and customer relationship management, the quality of all touristic services influenced by the intensifying competition, determine suppliers to take into account more the needs and requirements of customers in order to have a successful strategy. In the digital world where consumers are well-informed, the choice to purchase best quality services is the ultimate choice given the opportunity to compare other services with other companies. Both mana…

Dal coltivo ai boschi vetusti in ambienti mediterranei: l’accumulo di carbonio e azoto in suolo e lettiera durante i primi 120 anni dall’abbandono.

2013

Analisi degli approcci scientifici per la definizione comune di rinnovazione naturale con particolare riferimento all'ambiente mediterraneo

2015

La rinnovazione forestale è il futuro di ogni foresta ed è legata a diversi fenomeni ecologici. Molti studi hanno utilizzato vari metodi per analizzare la rinnovazione forestale; tuttavia, a livello internazionale, non esiste un metodo comune condiviso per classificare il fenomeno della rigenerazione stessa. Con l’obiettivo di trovare una possibile sintesi comune questo lavoro analizza il fenomeno della rinnovazione naturale attraverso sia l’analisi di inventari forestali sia di pubblicazioni scientifiche. La ricerca ha permesso di elaborare un elenco bibliografico multilingue attraverso l’interrogazione di database on-line, la ricerca con parole chiave e l’analisi dei riferimenti bibliogra…

Report on medium-term effects of the habitat protection and restoration activities of the LIFE Project “Maintenance of the habitats of the Macalube o…

2013

The Site of Community Importance (SCI) “Macalube di Aragona” is prone to severe desertification risk. In fact, its vegetation is disturbed not only by cyclic soil movements resulting from sedimentary volcanism, but it is strongly influenced by the hostile properties of the clayey substratum (prone to intense linear erosion, badly aired, rich in salts, etc.), the long drought period (ca. 4 months) and by the long-lasting history of human pressure. Both stress and disturbance factors influence progressive succession processes, so that the most “mature” local plant communities are () the chenopod shrublands referred to Salsolo-Peganion (habitat 1430 according to 92/43 EU Directive) and the hal…