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7
result(s) for
"gap-cutting"
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Short-term effects of clearing restoration on the relationship of plant and moth communities
by
Scalercio, Stefano
,
Lonati, Michele
,
Barberis, Davide
in
Abundance
,
Butterflies & moths
,
Clearing
2024
Insects and plants share a close relationship; plants provide feeding opportunities, ecological niches, and shelters for insects, while insects, in turn, facilitate pollination for plants. Management actions might positively or negatively affect insect species richness and/or abundance, in particular, forest practices can significantly influence insect communities. In this study, we investigated the effects on plant and moth communities following the realization of an ecological corridor (composed of 10 clearings) in forest in NW of Italy. Specifically, through plant surveys and moth light traps, we investigated plant and moth communities and their relationship in newly shaped clearings and their surrounding forest. We found that plants responded quickly to clearing formation, presenting differentiated plant communities between xero-thermophile clearings, mesophile clearings and forest. These differences reflected on moth communities as well, allowing to find indicator species for each ecosystem. Structural variables (i.e. openness) and topography (i.e. elevation) were key factors affecting the differentiation of moth communities. On the other hand, plants explained most of the variance in moth communities, so, through plants, we differentiated moth communities into those typical of xero-thermophile clearings, mesophile clearings and forest. In conclusion, forest management significantly affects plant and moth communities. Newly shaped clearings support higher species richness (including specialist species) and abundance than closed canopy forest. To increase species richness and abundance for both plants and moths, we suggest conservation measures that include creating open habitats within forests at medium elevation (650–950 m a.s.l.).
Journal Article
Small canopy gaps do not affect the predation pressure on large ground beetles (Coleoptera: Carabidae) in a managed forest
2024
Continuous cover forestry is a silvicultural system designed to mimic natural forest dynamics and maintain the struc-ture of uneven-aged semi-natural forests. One of the key steps in this approach is to create small gaps in the canopy by logging small groups of trees or individual trees. In gap-cutting, the main goal is to determine the optimal shape and size of these gaps in order to ensure spontaneous natural regeneration of the major tree species in the canopy. Yet, it remains relatively unknown how various arthropods respond to such forestry practices. Carabid beetles (Coleoptera: Carabidae) play an important role as predators of various small invertebrates and their predators are mostly vertebrates. The interactions between carabids and their predators might change due to shifts in the distribution of patches of suitable habitat as a result of forest management. Here, the aim was to determine whether gaps in the canopy of two different sizes (small vs. large) and shapes (circular vs. elongated) can affect the predation pressure on large carabids in a Hungarian oak-hornbeam forest. Using 3D-printed decoys of the largest com-mon carabid in the area, Carabus coriaceus, placed in each of the four gap treatments and control plots, the seasonal, diurnal, and treatment-specific aspects of predation pressure was estimated. This revealed no significant effects of any of the variables included in this study, which indicates that predation pressure in undisturbed controls located in closed forests and small canopy gaps did not differ significantly. Creating gaps in the canopy by felling few trees seems to be a good strategy for maintaining the forest ecological network with minimal disruption compared clear-felling large areas.
Journal Article
Forest restoration by burning and gap cutting of voluntary set-asides yield distinct immediate effects on saproxylic beetles
2017
Today, the importance of restoring natural forest disturbance regimes and habitat structures for biodiversity is widely recognized. We evaluated the immediate effects of two restoration methods on wood-inhabiting (saproxylic) beetles in boreal forest voluntary set-asides. We used a before-after control-impact experimental set-up in 15 set-asides; each assigned to one of three treatments: (1) restoration burning, (2) gap cutting and (3) no-treatment reference stands. Before treatment, abundance, species richness and assemblage composition of trapped beetles did not differ significantly among treatments. Burning resulted in a significant change in assemblage composition and increased species richness and abundance compared to reference stands. As predicted, saproxylic species known to be fire favoured increased dramatically after burning. The immediate response shows that, initially, fire favoured species are attracted from the surrounding landscape and not produced on site. Gap cutting increased the abundance of cambium consumers but had no significant effect on total species richness or assemblage composition of saproxylic beetles. The stronger effect of burning compared to gap cutting on saproxylic assemblages is probably due to the very specific conditions created by fires that attracts many disturbance-dependent species, but that at the same time disfavour some disturbance-sensitive species. By contrast, gap cutting maintained assemblage composition, increased abundances and is likely to increase species richness in the years to follow, due to elevated level of dead wood. The restoration methods applied in this study may prove particularly useful, partly because of positive effect on saproxylic beetles, but also due to the cost-efficiency of the measures; the voluntary set-asides were already established and the restoration costs fully covered by revenue from the extracted timber.
Journal Article
Root strength and density decay after felling in a Silver Fir-Norway Spruce stand in the Italian Alps
2014
AIMS: Forests induce a mechanical reinforcement of soil, generally quantified in terms of additional root cohesion (c ᵣ ), which decreases due to root decay after felling. The aim of this work is providing new field data on soil reinforcement by roots after trees cutting. METHODS: The present work investigated c ᵣ decay in a mixed Silver Fir-Norway Spruce (Abies alba Mill. Picea abies (L.) Karst.) stand in the Italian Alps over a period of 3 years after felling by monitoring the two c ᵣ driving variables: root tensile resistance and root density. RESULTS: Results showed that a significant difference in root resistance occurred only 3 years after felling, whereas the decrease in the number of roots was significant in the second year. The degradation process was more rapid in shallower layers and for thinner roots, as a consequence of the pattern of biological activity rate. The reduction of c ᵣ after felling was, for a reference profile depth of 70 cm, 55 % in the first 2 years and another 16 % in the third year. CONCLUSIONS: The findings of this study, providing new data on the decrease of c ᵣ after felling, can be introduced into geotechnical models allowing a better estimation of the stability of forest hillslopes.
Journal Article
Use of canopy gap openings to restore coniferous stands in Mediterranean environment
2017
In Mediterranean regions, climate change increasingly affect tree species distributions. Conifer forests under continuing disturbance show a more rapid shift to dominance by beech and other temperate broadleaves. Thus, there is an urgent need to conserve coniferous vegetation to avoid local extinction. Gap opening has profound effects on the structure and dynamics of most forests and may represent a sustainable way to restore coniferous ecosystems in Mediterranean habitats. What kind of artificial canopy opening is the most sustainable and effective means for restoring coniferous ecosystem functions? We explored the efficacy of artificial gaps in regeneration and dynamics of coniferous in Mediterranean environment. We examined how regeneration of different tree species is associated with soil environmental conditions and how gaps of different sizes influence the ecology and management of Mediterranean forest. Specifically, we analyzed gap disturbance in silver fir and black pine stands, as they dominate central and southern Italian forests. We demonstrated a specificity between gap size and coniferous species regeneration, indicating that small gaps (about 200 m2) favor silver fir regeneration, while black pine, depending on its subspecies, regenerates both in small and medium gaps (about 500 m2). Further, we found that gap characteristics (age and shape) and suitable substrate availability are the primary factors affecting seedling establishment. Our results provide functional information to design a silvicultural system useful to manage the natural regeneration of Mediterranean forest minimizing the environmental and visual impact.
Journal Article
Positive effects of ecological restoration on rare and threatened flat bugs (Heteroptera: Aradidae)
by
Hägglund, Ruaridh
,
Tolvanen, Anne
,
Hekkala, Anne-Maarit
in
Animal Ecology
,
Animal populations
,
Aradidae
2015
Intensive management of boreal forests has replaced natural disturbances, leading to losses of residual deadwood and saproxylic biodiversity. Declining population sizes have been well documented for insect groups such as bark and wood-boring beetles, whilst other groups such as flat bugs (Heteroptera: Aradidae) are less well-studied and little is known about their response to forest restoration. We conducted two restoration experiments addressing this lack of knowledge. We predicted the following responses to restoration: (1) artificial gap-creation and prescribed burning will attract more flat bugs than control stands, (2) increasing pre-burning fuel loads will have a positive influence on flat bug response to fire restoration. To test these predictions we conducted two field experiments; in Sweden we compared prescribed burning of standing forest with artificial gap-creation and in Finland we compared differing levels of fuel-load prior to burning. We found partial support for our first prediction, total numbers of flat bugs collected was higher in burned forest stands compared to controls in both countries. By contrast, gap-cutting only resulted in a marginal increase in the numbers and species of flat bugs collected. We found no support for our second hypothesis. The red-listed Aradus angularis and A. laeviusculus were primarily found in burned stands. Aradus betulae, A. betulinus and A. lugubris were more frequent in burned stands than gap-cuttings and untreated controls. Our study therefore suggests that ecological restoration, especially burning, is an efficient way of attracting flat bugs to suitable habitat, we therefore recommend ecological restoration to be incorporated in boreal forest management.
Journal Article
Female genital cutting, women's health and development : the role of the World Bank
by
Rogo, Khama
,
Toubia, Nahid
,
Subayi, Tshiya
in
ABUSE
,
ADOLESCENT REPRODUCTIVE HEALTH
,
ADOLESCENTS
2007
This strategy paper provides a comprehensive understanding of the issue of female genital mutilation/cutting-scope,challenges, opportunities, best practices, and how communities, development agencies, and national governments can work together to eliminate the practices on the ground. The World Bank is committed to assisting governments in ending the practice of female genital cutting, as the practice has a direct, negative impact on the health and well-being of women around the world. The recommendations set forth in this paper take advantage of the World Bank's comparative advantage in dealing with governments. Continued silenceperpetuates the practice, thereby undermining women's productivity.