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a b s t r a c tPlantations are important REDD+strategies for increasing carbon sequestration while enhancing local livelihoods. Reforestation along roads and highways under participatory forest management in southwestern Bangladesh could contribute to REDD+. This study assessed the diversity and structure of roadside plantations in order to develop a basal area based generalized allometric model for estimating above-and below-ground tree biomass carbon in Southwestern Bangladesh. All woody plants with d.b.h. 2 cm were identified and their diameters measured in 108 systematically selected zigzag plots of equal size (2 × 10 m). A total of 36 species in 17 families were recorded. Leguminosae accounted for 28% of species and 94% of the total estimated biomass carbon. We estimated a mean stem density of 4528 ha −1 , basal area of 52.6 m 2 ha −1 and biomass carbon of 192.80 Mg ha −1 . Samanea saman, Dalbergia sissoo, Acacia nilotica, and Leucaena leucocephala accounted for most density, basal area, and carbon. We developed and validated three allometric models with equal strength (R 2 0.94-0.98) using generalized linear regression. Roadside plantations in Bangladesh can now surely participate in the UNFCCC's carbon mitigation and adaptation mechanism, but challenges to their long-term sustainability must be addressed.
Climate change effects cause major socioeconomic challenges for marginalized groups, particularly women, in Bangladesh. Specifically, drought increases resource scarcity, causing social problems that impact women, which can be described as the gendered sociocultural construction of vulnerabilities. Given this constructed dimension of gender-based vulnerability, this paper explores the effects of drought on marginalized women in one local case study, namely Badlagaree village in Gaibandha district, Bangladesh. To examine this linkage, we collected qualitative primary data using ethnographic research methods, primarily focus group discussions. Findings show that gender-based vulnerability is increasing due to growing drought effects, including agricultural production loss. Marginalized women, because of their gender identity, encounter these drought effects through unemployment, food insecurity, illiteracy, early marriage, dowry costs and violence. While further national-scale research is required, this paper argues that in order to overcome such gender-based vulnerability, current development policies, social programs, and adaptation strategies should better recognize such social dynamics. Further, a gender-specific understanding requires incorporation into adaptation policies through greater collaborative governance as an important prerequisite for sustainability.
ABSTRACT:The amount, variability and quality of coarse woody debris (CWD) in an oak-dominated natural forest reserve in Austria were studied in 2006. The average volume of CWD (snags and logs) was 107.3 m 3 /ha, which accounted for 39% of the total living volume. Among the CWD, on average, 23.4 m 3 /ha (22%) were snags and 83.9 m 3 /ha (78%) were logs. According to quality aspects the CWD displayed a wide range of variation in tree species, tree size, stage of decay, and structural characteristics, creating a high diversity of CWD habitats for microorganisms. Among the three forest associations, the highest amount of CWD was found in the mesic Galio sylvatici-Carpinetum association. The results of this study are discussed as reference values for a close-to-nature management of oak-dominated broadleaved submontane forests emphasizing conservation management.
A mangrove community along the oligohaline zone of the Sundarbans Reserve Forest (SRF), Bangladesh was selected to study stand structure, biomass accumulation, and carbon storage. Field data were measured from six plots of 2400 m 2 at three different locations. Species diversity and species wise contribution to total biomass carbon (TBC) were also analyzed. Heritiera fomes has maintained its dominance (53.8%, relative density) of the stand. The mean above-and below-ground biomass carbon stock of the mangrove community was 76.8 Mg ha¡1 and 41.1 Mg ha ¡1 , respectively. Avicennia officinalis contributed the highest TBC accumulation. Individuals of different mangrove species having diameter 9.99 cm constituted more than 72% of the mangrove stand but contributed less in carbon accumulation, representing only 15.6% of the TBC. While individuals having diameter in the 10-56 cm range constituted only 28% of stand density but contributed to high carbon accumulation, representing 84.4% of the TBC. Mangrove communities growing along the oligohaline zone of the SRF show high species richness and carbon stock, indicating their ecological significance, This needs to be considered in future decision making processes for the area as well as in understanding the role of SRF on mitigating the effects of climate change.
Call admission control (CAC) is important for cellular wireless networks in order to provide quality of service (QoS) requirements to users. Guard channel scheme is one of the CAC schemes. There are different computational models for analyzing the guard channel scheme which make unrealistic assumption of exponential distribution for both call holding duration and cell residence time for computational tractability. On the other hand, there are some more realistic models for guard channel schemes which capture general distributions of call holding duration and cell residence time by phase type distributions but are computationally cumbersome to implement. The state-spaces of the Markov chains for those models make the computation intractable. In this paper, we develop a tractable computational model to analyze guard channel scheme with general cell residence time and call holding duration captured by phase type distributions. We make our mathematical model computationally tractable by keeping track of the number of calls in different phases of the channel holding time instead of the phase of the channel holding time of individual calls.
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