Cesium-137-based erosion-rate determination of a steep mountainous region

Data on quantification of erosion rates in alpine grasslands remain scarce but are urgently needed to estimate soil degradation. We determined soil-erosion rates based on (CS)-C-137 in situ measurements. The method integrates soil erosion over the last 22 y (time after the Chernobyl accident). Measured erosion rates were compared with erosion rates modeled with the Universal Soil Loss Equation (USLE). The comparison was done in order to find out if the USLE is a useful tool for erosion prediction in steep mountainous grassland systems. Three different land-use types were investigated: hayfields, pasture with dwarf shrubs, and pasture without dwarf shrubs. Our test plots are situated in the Urseren Valley (Central Switzerland) with a mean slope steepness of 37 degrees. Mean annual soil-erosion rates determined with (CS)-C-137 of the investigated sites ranged between the minimum of 4.7 t ha(-1) y(-1) for pastures with dwarf shrubs to <30 t ha(-1) y(-1) at hayfields and pastures without dwarf shrubs. The determined erosion rates are 10 to 20 times higher compared to previous measurements in alpine regions. Our measurements integrated over the last 22 y, including extreme rainfall events as well as winter processes, whereas previous studies mostly reported erosion rates based on summer time and short-term rainfall simulation experiments. These results lead to the assumption that heavy-rainfall events as well as erosion processes during winter time and early spring do have a considerable influence on the high erosion amounts that were measured. The latter can be confirmed by photographs of damaged plots after snowmelt. Erosion rates based on the LISLE are in the same order of magnitude compared to Cs-137-based results for the land-use type "pasture with dwarf shrubs". However, erosion amounts on hayfields and pasture without dwarf shrubs are underestimated by the LISLE compared to Cs-137-based erosion rates. We assume that the underestimation is due to winter processes that cause soil erosion on sites without dwarf shrubs that is not considered by the USLE. Dwarf shrubs may possibly prevent from damage of soil erosion through winter processes. The USLE is not able to perform well on the affected sites. Thus, a first attempt was done to create an alpine factor for the USLE based on the measured data

Climate and land-use changes affecting river sediment and brown trout in alpine countries--a review

BACKGROUND, AIM, AND SCOPE: Catch decline of freshwater fish has been recorded in several countries. Among the possible causes, habitat change is discussed. This article focuses on potentially increased levels of fine sediments going to rivers and their effects on gravel-spawning brown trout. Indications of increased erosion rates are evident from land-use change in agriculture, changes in forest management practices, and from climate change. The latter induces an increase in air and river water temperatures, reduction in permafrost, changes in snow dynamics and an increase in heavy rain events. As a result, an increase in river sediment is likely. Suspended sediment may affect fish health and behaviour directly. Furthermore, sediment loads may clog gravel beds impeding fish such as brown trout from spawning and reducing recruitment rates. To assess the potential impact on fine sediments, knowledge of brown trout reproductive needs and the effects of sediment on brown trout health were evaluated. APPROACH: We critically reviewed the literature and included results from ongoing studies to answer the following questions, focusing on recent decades and rivers in alpine countries. Have climate change and land-use change increased erosion and sediment loads in rivers? Do we have indications of an increase in riverbed clogging? Are there indications of direct or indirect effects on brown trout from increased suspended sediment concentrations in rivers or from an increase in riverbed clogging? RESULTS: Rising air temperatures have led to more intensive precipitation in winter months, earlier snow melt in spring, and rising snow lines and hence to increased erosion. Intensification of land use has supported erosion in lowland and pre-alpine areas in the second half of the twentieth century. In the Alps, however, reforestation of abandoned land at high altitudes might reduce the erosion risk while intensification on the lower, more easily accessible slopes increases erosion risk. Data from laboratory experiments show that suspended sediments affect the health and behaviour of fish when available in high amounts. Point measurements in large rivers indicate no common lethal threat and suspended sediment is rarely measured continuously in small rivers. However, effects on fish can be expected under environmentally relevant conditions. River bed clogging impairs the reproductive performance of gravel-spawning fish. Discussion: Overall, higher erosion and increased levels of fine sediment going into rivers are expected in future. Additionally, sediment loads in rivers are suspected to have considerably impaired gravel bed structure and brown trout spawning is impeded. Timing of discharge is put forward and is now more likely to affect brown trout spawning than in previous decades. Conclusions: Reports on riverbed clogging from changes in erosion and fine sediment deposition patterns, caused by climate change and land-use change are rare. This review identifies both a risk of increases in climate erosive forces and fine sediment loads in rivers of alpine countries. Increased river discharge and sediment loads in winter and early spring could be especially harmful for brown trout reproduction and development of young life stages. Recently published studies indicate a decline in trout reproduction from riverbed clogging in many rivers in lowlands and alpine regions. However, the multitude of factors in natural complex ecosystems makes it difficult to address a single causative factor. Recommendations and perspectives: Further investigations into the consequences of climate change and land-use change on river systems are needed. Small rivers, of high importance for the recruitment of gravel-spawning fish, are often neglected. Studies on river bed clogging are rare and the few existing studies are not comparable. Thus, there is a strong need for the development of methods to assess sediment input and river bed clogging. As well, studies on the effects to fish from suspended sediments and consequences of gravel beds clogging under natural conditions are urgently needed

Key Competencies: Reconciling Means and Ends in Education for Sustainable Consumption

Sustainable consumption is a focal point of interest in the interplay of school-based health promotion and sustainability. It calls for alternative ways to satisfy the objective needs of current society and future generations whilst respecting "planetary boundaries". Action is called for that protects and safeguards environmental conditions that allow all humans to live a good and healthy life. In the pursuit of sustainable consumption, education is widely ascribed a pivotal role as an instrument for disseminating more sustainable consumer behaviors. However, beneath this seemingly consensual surface the questions of which sustainability objectives are appropriate in an educational engagement with consumption issues and how they can be pursued is the subject of controversial debate. This controversy is addressed in this chapter. In a first step, it suggests the development of key competencies as a valid and legitimate objective that addresses both individual and societal needs. The authors systematically derive a framework of key competencies for sustainable consumption and discuss the framework's application to educational practice. Secondly, the chapter addresses the question of how formal and informal learning settings need to be designed in order to promote the acquisition of such competencies among students. A participatory whole-school approach to changing the “culture of consumption” in educational organizations is presented that was developed, implemented and evaluated in a transdisciplinary 3-year project. The chapter concludes with a discussion of synergies between the sustainability and health agendas for the emergence of innovative schools for the twenty-first century

Affective Arousal During Blaming in Couple Therapy : Combining Analyses of Verbal Discourse and Physiological Responses in Two Case Studies

Blaming one’s partner is common in couple therapy and such moral comment often evokes affective arousal. How people attune to each other as whole embodied beings is a current focus of interest in psychotherapy research. This study contributes to the literature by looking at attunement during critical moments in therapy interaction. Responses to blaming in verbal dialogue and at the level of the autonomic nervous system (ANS) were investigated in two couple therapy cases with a client couple and two therapists. Video-recorded couple therapy sessions were analyzed using discursive psychology and a narrative approach. The use of positioning, a discourse analytic tool, was also studied. ANS responses of the participants, including the therapists, were measured as electrodermal activity. The findings demonstrate how identity blaming, i.e. positioning the other person in ways counter to their preferred identity narrative, was accompanied by increased electrodermal activity in most participants. In the two cases studied, blaming centered on the themes of loyalty, trust and parenting. It is argued that identity blaming in these thematic domains increases the arousal level of the partners, since disloyalty, unfaithfulness and irresponsible parenting threaten the stability of the relationship.peerReviewe