117,801 research outputs found
James L. Scotton
No full textCaptain James L. Scotton served with the 59th Infantry Pioneers DE ARNG in France
James L. Scotton
No full textCaptain James L. Scotton served with the 59th Infantry Pioneers DE ARNG in France
I Rinverdimenti della frana storica di Valmorel (Bl): efficacia e naturalità delle fitocenosi risultanti a confronto con interventi recenti realizzati in Trentino
No full textRelationships between management and diversity of permanent grasslands in the Non Valley (Trentino, NE Italy)
No full textUsing fertilization rates in semi-natural grasslands to produce seed for ecological restoration
No full textTo produce seeds of native species for ecological restoration, cultivating semi-natural grasslands can be a strategy that avoids the environmental impacts of conventional seed propagation and favours the conservation of species-rich grasslands. In a lowland grassland in northern Italy, the effects of three mineral fertilisation treatments (0–0–0, 0–54–108, and 192–108–216 kg ha−1 year−1 of N, P2O5, and K2O; abbreviations: 000, 0pk, and NPK) on seed production were studied in a fully randomised block design. Fertile shoots of flowering species were collected and analysed for seed content, and species phenology was recorded during field observations. The grassland environmental quality was described based on soil analyses and indices of natural (plant and insect richness) and aesthetic (flower colour) value. NPK produced the highest viable seed amount (59,375 m−2 year−1). The seed mixture was composed mostly of grasses (97%) and included the lowest species number (34). NPK also had the l..
Seed production of a subalpineFestuca nigrescens-Agrostis capillaris semi-natural grassland in the eastern Italian Alps
No full textStudying the seed production of semi-natural grasslands helps to understand their regeneration processes and to evaluate the
possibility of collecting seed useful for ecological restoration. In a subalpine Festuca nigrescens – Agrostis capillaris meadow,
the development of the main grasses’ seed production and the standing seed yield at meadow maturity were studied.
The inflorescence size was in the lower part of the variation range reported in previous studies. The seed viability was average to
high and durable. The biological floret site utilization was mostly above 50%. With 458 fertile stems m22, the seeds produced
(all seeds produced up to the time of the meadow maturity) by the main grasses were 21,000m22, of which 77% were of
A. capillaris and 81% were viable.On a 3-year average, the standing seed yield (seeds present on the plants, i.e. produced minus
shed seeds) at meadow maturity was 6953 seedsm22. Amount and composition of the produced seeds were affected mainly by
the variability among years of the fertile stems density of the perennial grasses and the annual hemiparasite Rhinanthus freynii.
The percentage of produced seeds which formed the standing seed yield was affected mainly by the collecting date
Metodi di rivegetazione in ambiente alpino. Restauro ecologico per la difesa del suolo contro l'erosione.
No full textThe selection of native species in revegetation of alpine areas of the Dolomites above the timberline.
No full textVascular plant and Orthoptera diversity in relation to grassland management and landscape composition in the European Alps
No full text1. Several recent studies have considered the relative effects of local vs. landscape factors on diversity of several animal taxa in grasslands. However, very few have considered vascular plant or Orthoptera species, both of which are important biotic components of grassland ecosystems. The general aim of this study was to determine the effect of grassland management and landscape composition, and their potential interactions, on diversity patterns of vascular plants and Orthoptera in Alpine hay meadows.
2. We considered three groups of management regimes defined by different amounts of fertilizer nitrogen applied and cutting frequency: (i) extensive, (ii) low intensive and (iii) intensive meadows situated in different landscape contexts. To evaluate the relative importance of meadow management and landscape composition on diversity patterns, we applied analysis of covariance and variation partitioning analyses.
3. Diversity patterns of both taxonomic groups were affected primarily by grassland management. The extensive management regime was most suitable for conserving high species richness of both taxonomic groups. The intensive meadows were characterized by plant communities dominated by a few ruderal and competitor species, and by Orthoptera communities composed of only a few abundant Caelifera species (e.g. Chorthippus parallelus), while Ensifera species had very low individual densities.
4. Regarding the landscape determinants, plant diversity patterns were not significantly related to any landscape composition variables. In contrast, a high proportion of urban elements and grassland in the surrounding landscape (radius 500 m) affected Orthoptera species richness negatively.
5. Synthesis and applications . The implementation of well-targeted agri-environment schemes for compensation payments against intensification and abandonment of extensive hay meadows seems to be a promising tool to protect both taxonomic groups. In this context, we suggest that the existing Swiss ecological compensation area (ECA) hay meadow agri-environment scheme, which requie at least one cut every year and no fertilizer application, might also be suitable for the Italian Alps. Moreover, the significant influence of landscape composition on Orthoptera diversity suggests that the effectiveness of measures applied at a field scale may be improved by integration of protected area schemes, promoting extensive management at a farm scale
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