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Articles by Pankaj Sah
Total Records ( 2 ) for Pankaj Sah
  Pankaj Sah , Fatma M. Al-Azri , Hafsa A. Al-Saidi and Abdullah A. Al-Sanjoor
  Background: Conservation and restoration of Arabian arable lands warrants immediate attention from the world scientific community due to rising mean global temperature and augmented anthropogenic impact on this part of the world. Understanding the environmental factors that influence and regulate seed germination is very important for the establishment and regeneration of various plant communities in various ecosystems. Materials and Methods: The effects of temperature and medium were investigated in the germination behaviors of three different leguminous herbs in the hot and arid zone of Muscat. The experiment was designed to study seed germination behaviors with a temperature gradient (mean treatment: 25, 30, 35 and 40°C) and different media treatments. The data was statistically analyzed for Mean±Standard Error, Pearson bivariate correlation, one way analysis of variance (ANOVA) and post hoc analysis (Holm-Sidak method) by SPSS ver. 20 and Sigma Plot ver. 12. Results: Trigonella foenum-graecum L., showed the best germination trend (100%) over other studied legumes (Pisum sativum L. and Glycine max L.). Levin’s standardized niche breadth analysis (BA) also confirmed the broad temperature and media tolerance ability of Trigonella foenum-graecum L. It was observed that Trigonella foenum-graecum L., is a ‘Generalist species’ with broad niche breadth (BA = 0.80). While, Glycine max (BA = 0.59) was found to be a ‘Moderately generalist species’. Whereas Pisum sativum was found to be a ‘Specialist species’ with narrow niche breadth (BA = 0.33). Conclusion: Here, it is showed that Trigonella foenum-graecum L., can survive very easily in the hot and nutrient poor environmental conditions of Sultanate of Oman. Hence, it can be used as potent nitrogen sequester species in selected areas of interest to mobilize significant amounts of nitrogen in arid agricultural ecosystems. This type of study will not only help in reclaiming the degraded arable lands but also in sustainable agriculture and future agro-forestry practice in Oman and Arabia. It is finally concluded that if the farmers are encouraged to grow this crop in various seasons then it could fix significant amount of atmospheric nitrogen in soil. This will further facilitate the farmers and a possible reduction in the use of chemical fertilizers in agricultural lands will eventually help saving environment. The conservation of soil can be ensured with increased use of this species in these parts of the world. Promotion of this plant will also help in restoration of degraded arable lands of Arabia.
  Pankaj Sah , Najwa Al-Hattali , Hajer Al-Ajmi and Iman Al-Bakari
  Background: Augmented anthropogenic activities are posing a direct threat to species diversity at regional and global scale for past many decades. Ecologists are very much alarmed about the serious repercussions of diversity-loss and predicting depauperate and poor functioning ecosystems in near future. However, the results of many such studies have been questioned too, on the basis of faulty inclusion of high productive species in experiments that rendered the relationship between diversity and ecosystem functioning debatable. Objective: Present study tries to find out the answer and deals exclusively with the effects of species diversity and richness on the productivity of plant communities in microcosms. Methodology: Pearson correlation and analysis of variance (ANOVA) carried out across all communities to observe the effect of species diversity and richness on herb productivity, indicated a highly significant and positive relationship (r = 0.85, F = 20.93, p<0.001), (r = 0.76, F = 11.23, p<0.01), respectively. Results: The results lend support to diversity-productivity hypothesis even at smaller scale ecosystems. This study comes to a new finding that at smaller scale ecosystems, the role of growth forms proves to be redundant and what matters most is species diversity and richness on the functioning of ecosystems. Conclusion: The present study accentuates the issues of ecological conservation and elucidates that more diverse and species rich areas are prerequisite for better functioning ecosystems. Therefore, this study recommends the conservation of biodiversity and that the productivity and functioning of an ecosystem can be enhanced by conserving and promoting its alpha diversity.
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