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RISS 인기검색어
- 검색키워드
- 저자 : Kailash S. Gaira (검색결과 2 건)
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Kailash Gaira,Ranbeer S. Rawal,K.K. Singh 국립중앙과학관 2016 Journal of Asia-Pacific Biodiversity Vol.9 No.1
Large cardamom (Amomum subulatum Roxb.), a perennial cash crop, cultivated under an agroforestry system in the eastern Himalaya of India, is well recognized as a pollination-dependent crop. Observations on pollinator abundance in Mamlay watershed of Sikkim Himalaya were collected during the blooming season to evaluate the pollinator abundance across sites and time frames, and impact of pollinator abundance on crop yield from 2010 to 2012. The results revealed that the bumblebees and honeybees are most frequent visitors of large cardamom flowers. The abundance of honeybees, however, varied between sites for the years 2010–2012, while that of bumblebees varied for the years 2011 and 2012. The abundance of honeybees resulted in a variation within time frames for 2010 and 2011, while that of bumblebees varied for 2010 and 2012 (p < 0.01). The density of pollinators correlated positively with the number of flowers of the target crop. The impact of pollinator abundance revealed that the increasing bumblebee visitation resulted in a higher yield of the crop (i.e. 17–41 g/plant) and the increasing abundance of all bees (21–41 g/plant) was significant (p < 0.03). Therefore, the study concluded that the large cardamom yield is sensitive to pollinator abundance and there is a need for adopting the best pollinator conservation and management practices toward sustaining the yield of large cardamom.
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Sheila Sinha,Hemant K. Badola,Bijoy Chhetri,Kailash S. Gaira,Jhony Lepcha,Pitamber P. Dhyani 국립중앙과학관 2018 Journal of Asia-Pacific Biodiversity Vol.11 No.2
Himalayas provide high altitudinal gradients and extreme slopes which may rapid changes in climatic zones over a small distance which reflects noticeable changes in the forest community structures. We identified and analyzed various aspects of forest community composition with the effect of climatic variables and altitudes in the Singalila National Park (SNP), Khangchendzonga Landscape in Eastern Himalayas (India). We encountered 2075 woody individuals of 70 species within a transect (2000 m-3636 m asl). The entire forest regime reflected a dominance of young trees and the species richness showed a negative correlation with the altitude. Climatic variables (actual evapotranspiration, potential evapotranspiration and moisture index) are the measures of available environmental energies which drive the final shape of forest community structure. Our study revealed that these forces showed a significant relationship with species richness and altitude of the forest which provides the present shape of forest community composition structure of the SNP.
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