Search results for "Litter"
showing 10 items of 315 documents
The effect of ash and needle cover on surface runoff and erosion in the immediate post-fire period
2008
Abstract Hillslopes are thought to be most susceptible to enhanced surface runoff and erosion immediately following wildfire due to removal of protective vegetation and litter cover, and in many cases a fire-induced reduction in soil wettability. This enhanced susceptibility declines as vegetation and litter layer recover. For logistical reasons, however, few studies have been able to examine the responses of burnt terrain immediately following burning and little is therefore known about the effect of the wettable ash layer that often covers the ground until it is redistributed or removed by wind or water erosion. Here we quantify the effects of ash and needle cast ground cover on surface r…
Element Inputs by Litterfall to the Soil in Pine Forest Ecosystems
2006
Within the framework of the litterfall chemistry subprogram of the integrated monitoring program, litterfall was collected, and the concentrations of Ca, Mg, K, Pb, and Zn were measured during 1999–2003 at the Taurene and Rucava monitoring stations in Latvia. The results showed that at Rucava there was higher production of litterfall than at Taurene due to a higher tree density. The mean annual litterfall was 3630.42 kg/ha−1 in Rucava and 3022.11 kg/ha−1 in Taurene, with maximum production in autumn at both sites. The litterfall production among the catchments varied seasonally because length of growing period, composition of tree species, and density of snow cover. The higher Ca, Mg, and K…
Organizing Shared Digital Reading in Groups: Optimizing the Affordances of Text and Medium
2019
Children develop their language when they explore and talk about literary texts. In this study, we explore the design of shared digital reading as a basis for critical reflection on the reading situation in an institutional context with its given opportunities and limitations. We examine six videotaped readings of one specific picture book app, with a focus on the strategies used by teachers in early childhood education and care institutions to control children’s access to the medium and the types of verbal engagement (about the story and about the medium) that are generated by these different strategies. We use qualitative and quantitative analysis of video data. A qualitative categorizat…
An invasive species may be better than none: invasive signal and native noble crayfish have similar community effects
2014
14 pages; International audience; Human activities have resulted in the decline of native crayfish and promoted the spread of invasive crayfish species in European fresh waters, threatening ecosystem structure and functioning. We compared effects of native noble crayfish (Astacus astacus), invasive signal crayfish (Pacifastacus leniusculus) and of the absence of crayfish on leaf litter breakdown and invertebrate prey density and biomass in stream ecosystems. In microcosm experiments, invertebrate shredder density was significantly reduced by crayfish presence but similarly affected by the two crayfish species. While crayfish did not directly influence leaf litter breakdown, their presence r…
Alt vil være, som det var før. Krisediskurs og utopi i Ben Lerners 10:04
2020
Sammendrag Krisenarrativer er et centralt emne i Ben Lerners anden roman, 10:04 (2014). Romanen, som indledes og afsluttes med en storm, undersøger de konsekvenser og forventninger, der er forbundet med at udnævne en bestemt hændelse eller tid til at være en krise, hvad enten begivenheden er opstået som følge af naturen, økonomien eller individuelle årsager. Antropologen Janet Roitman har beskrevet, hvordan krisenarrativer definerer og former vores forståelse af verden og på denne måde begrænser vores muligheder for at forandre verden. I 10:04 forsøger Lerner, i efterdønningerne af den finansielle krise i 2007-09, at undersøge, hvordan krisens rammeværk påvirker vores forståelse af verden, …
CO2 flux measurements in volcanic areas using the dynamic concentration method: the influence of the soil permeability.
2006
In order to evaluate the influence of soil permeability on soil CO2 flux measurements performed with the dynamic concentration method, several tests were carried out using soils characterized by different permeability values and flow rates. A special device was assembled in the laboratory to create a one-dimensional gas flow through a soil of known permeability. Using the advective-diffusion theory, a physical model to predict soil concentration gradients was also developed. The calculated values of CO2 concentrations at different depths were compared with those measured during the tests and a good agreement was found. Four soils with different gas permeability (3.6 x 10(-2) to 1.23 x 10(2)…
Droga – spotkanie – doświadczenie. Stanisława Wyspiańskiego opisy katedr gotyckich
2012
Road – encounter – experience. Stanisław Wyspiański’s descriptions of Gothic cathedralsThe article focuses on the first European travel of Stanisław Wyspiański, which took place in 1890. His correspondence with Lucjan Rydel constitutes the record of experiences of the young artist. In letters addressed to Rydel descriptions of Gothic cathedrals were put on the foreground. Wyspiański admires these cathedrals in numerous French cities visited during roams. The aim of the article is to analyze those descriptions, which are read through the prism of category of aesthetic experience, focusing on such categories as road and encounter.
Literatura y cultura para una didáctica intercultural del español como lengua extranjera (ELE)
2016
This work evolves around a main purpose: to analyze the role of literature in the pedagogy of Spanish as a Foreign Language from an intercultural perspective. From this standpoint, we reflect about the importance of the term Spanish Literature to defend the different literatures implied in the syntagm; hence, we study how comparative literature becomes the main tool to understand linguistic, cultural and literary diversity. We consider that these two ideas should be in the pedagogical profile of the Spanish as a Foreign Language professor.
Assessing the Cost of Mounting an Immune Response
2003
International audience; The evolution of parasite resistance has often been assumed to be governed by antagonistic selection pressures. Defense against pathogens, by mounting an immune response, confers evident benefits but may also incur costs, so that the optimal level of defense is expected to depend on the balance between benefits and costs. Although the benefits of immune surveillance are well known, estimates of costs are still equivocal. Here we studied the behavioral and physiological modifications associated with exposure to a onreplicating antigen (lipopolysaccharide [LPS] of Escherichia coli) in a passerine species, the house sparrow (Passer domesticus).We further investigated wh…