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Singh, Hukum
- Addition to the Flora of Upper Gangetic Plain: Status of Solanum villosum Mill. a New Record from Bareilly, Uttar Pradesh
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Authors
Affiliations
1 Department of Botany, Taxonomy and Herbarium Division, Bareilly College Bareilly (U.P.) - 243001, IN
2 Climate Change and Influence Division, Forest Research Institute, P. O. New Forest, Dehradun – 248006, IN
1 Department of Botany, Taxonomy and Herbarium Division, Bareilly College Bareilly (U.P.) - 243001, IN
2 Climate Change and Influence Division, Forest Research Institute, P. O. New Forest, Dehradun – 248006, IN
Source
Indian Forester, Vol 139, No 11 (2013), Pagination: 1052-1053Abstract
No Abstract
References
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- Role of Sb Substitution on Electrical Properties of Se-Te Glasses
Abstract Views :131 |
PDF Views:0
Authors
Deepika
1,
Hukum Singh
1
Affiliations
1 Department of Applied Sciences, The NorthCap University, Sector 23-A, Gurgaon –122017, Haryana, IN
1 Department of Applied Sciences, The NorthCap University, Sector 23-A, Gurgaon –122017, Haryana, IN
Source
Indian Journal of Science and Technology, Vol 9, No 48 (2016), Pagination:Abstract
Objectives: This paper reports the influence of Sb addition on the electrical properties on bulk samples of Se80-xTe20Sbx(x=0,6, 12) glasses. Methods/Statistical Analysis: The amorphous samples have been prepared using melt quenching method and the pellets of the bulk sample of thickness 1mm and diameter 5mm has been formed using pelletiser. The I-V measurements of pellets have been recorded on Keithley electrometer in the temperature range 298-398 K. The data obtained is analysed to calculate activation energy of conduction and temperature dependent dc electrical conductivity. Findings: The observations suggest that conductivity decreases due to formation of highly crosslinked structure when Sb is added in less amount i.e. 6 at.wt% whereas on addition of Sb upto 12 at. wt. %, conductivity increases significantly due to increase in ring structure and decrease of steric hindrance in system. Earlier reports on the electrical properties of Se-Te-Sb system provided information upto 10 at. wt. % of Sb addition to Se-Te system, whereas in present study Sb is added upto 12 at.wt.% to get its influence on electrical properties of Se-Te system. Applications/Improvements: The higher content of Sb in Se-Te system increases the electrical conductivity which makes it a potential candidate for application in electronic devices.Keywords
Activation Energy, Electrical Conductivity, Hopping Conduction, Hopping Energy, Se-Te-Sb GlassesFull Text
- Soil Organic Carbon Pools under Terminalia chebula Retz. based Agroforestry Systemin Himalayan Foothills, Indiax
Abstract Views :246 |
PDF Views:86
Authors
Amit Kumar
1,
G. K. Dwivedi
1,
Salil Tewari
1,
Jaipaul
1,
V. K. Sah
1,
Hukum Singh
2,
Parmanand Kumar
2,
Narendra Kumar
2,
Rajesh Kaushal
3
Affiliations
1 Agroforestry Section, College of Agriculture, G.B. Pant University of Agriculture and Technology, Pantnagar, U.S. Nagar 243 145, IN
2 Forest Ecology and Climate Change Division, Forest Research Institute, Dehradun 248 006, IN
3 ICAR-Indian Institute of Soil and Water Conservation, Dehradun 248 001, IN
1 Agroforestry Section, College of Agriculture, G.B. Pant University of Agriculture and Technology, Pantnagar, U.S. Nagar 243 145, IN
2 Forest Ecology and Climate Change Division, Forest Research Institute, Dehradun 248 006, IN
3 ICAR-Indian Institute of Soil and Water Conservation, Dehradun 248 001, IN
Source
Current Science, Vol 118, No 7 (2020), Pagination: 1098-1103Abstract
Knowledge of carbon (C) pools in soils is helpful in devising practices for efficient carbon management in intensive cropping systems. Carbon fractions of soil organic carbon are used asan indicator for land-use induced change in soil quality. The present study evaluated carbon pools under Terminalia chebula(chebulic myrobalan) based agroforestry system supplied with different nutrient sources, viz. farmyard manure, poultry manure, vermicompost, wheat straw and inorganic fertilizer (NPK @ 100:80:60). Carbon fractions, viz. very labile (C1 frac), labile (C2 frac), less labile (C3 frac) and non-labile (C4 frac), were analysed at 0–15 and 15–30 cm soil depth. The higher value of C1 frac (13.8%), C2 frac (4.8%), C3 frac (8.3%) and C4 frac(11.1%) were recorded under agroforestry as compared to open system. Among the nutrient sources, all the carbon fractions were higher under 100% integrated nutrient sources as compared to controlled treatment. Microbial biomass carbon (MBC) was recorded higher (298.31 μg g–1 ) under agroforestry system compared to the open system (290.63 μg g–1 ) at 0–15 cm. Among the different nutrient sources, higher MBC (458.66 μg g–1 ) at 0–15 cm and lower (340.59 μg g–1 ) at 15–30 cm soil depth was recorded in 100% integrated treatment.Thus, agroforestry-based land-use types and integrated nutrient management are more efficient for soil health and carbon management in Himalayan foothills.Keywords
Active Pool, Carbon Fractions, Labile, Nonlabile, Nutrient Sources, Passive Pool.Full Text
References
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- Assessment of Soil Carbon Dioxide Efflux and its Controlling Factors in Moist Temperate Forest of West Himalayas
Abstract Views :219 |
PDF Views:80
Authors
Affiliations
1 Forest Ecology and Climate Change Division, Forest Research Institute, Dehradun 248 006, IN
1 Forest Ecology and Climate Change Division, Forest Research Institute, Dehradun 248 006, IN
Source
Current Science, Vol 119, No 4 (2020), Pagination: 661-669Abstract
In this study, the soil CO2 efflux was measured by closed dynamic system method along with soil and meteorological parameters at 1600, 1700 and 1800 m elevations along different directional-aspects over a period of one year. The annual CO2 efflux rate (Fc) varied from 1.02 to 22.57 μmol m–2 sec–1, which was highest in the rainy season. The annual average Fc was maximum (8.67 μmol m–2 sec–1) at east facing slope followed by 7.58 and 7.32 μmol m–2 sec–1 at south facing slope and north facing slope respectively. Temperature (Ts), moisture (Sm) and evaporation of soil were found to be significant variables and selected to develop the regression model with R2 value of 0.85. The effect of soil moisture on Fc above 15°C Ts exhibited a better relationship with R2 value of 0.48 and temperature sensitivity (Q10) was found 3.25. This study reveals that the key controlling factors of CO2 efflux rate are soil moisture and soil temperature, which explains 66% variation in soil CO2 efflux.Keywords
Seasonal Variation, Soil CO2 Efflux, Soil Moisture, Soil Temperature, Spatial Variation, West Himalayas.Full Text
- Biomass Accumulation and Carbon Stock in Different Agroforestry Systems Prevalent in the Himalayan Foothills, India
Abstract Views :237 |
PDF Views:80
Authors
Amit Kumar
1,
Salil Tewari
2,
Hukum Singh
1,
Parmanand Kumar
1,
Narendra Kumar
1,
Sarita Bisht
1,
Suruchi Devi
1,
Nidhi
1,
Rajesh Kaushal
3
Affiliations
1 Forest Research Institute, Dehradun 248 006, IN
2 G. B. Pant University of Agriculture and Technology, Pantnagar 263 145, IN
3 ICAR-Indian Institute of Soil and Water Conservation, Dehradun 248 001, IN
1 Forest Research Institute, Dehradun 248 006, IN
2 G. B. Pant University of Agriculture and Technology, Pantnagar 263 145, IN
3 ICAR-Indian Institute of Soil and Water Conservation, Dehradun 248 001, IN
Source
Current Science, Vol 120, No 6 (2021), Pagination: 1083-1088Abstract
Agroforestry has great potential for carbon (C) sequestration among different land uses of the Himalayan region, India. However, our knowledge of C sequestration in particular, agroforestry system around the world is poor. Therefore, we conducted a study to understand biomass accumulation and carbon allocation in different components of the agroforestry system. The highest stem biomass was recorded in Eucalyptus tereticornis (69.43 ± 0.90 Mg ha–1), branch biomass in Populus deltoids (5.04 ± 0.35 Mg ha–1), leaf biomass also in P. deltoids (2.21 ± 0.12 Mg ha–1), and ischolar_main biomass in Albizia procera (14.01 ± 0.44 Mg ha–1). The highest (81.01%) C allocation was recorded in the stem of Toona ciliate, branch of P. deltoids (5.73%), leaves of E. tereticornis (2.93%) and ischolar_main of Anthocephalus cadamba (16.83%). The highest CO2< mitigation (160.5 ± 2.55 Mg CO2 ha–1) and C sequestration (45.33 ± 0.60 Mg ha–1) were recorded in E. tereticornis. The highest wheat crop biomass (11.85 ± 0.23 Mg ha–1) and C stock (3.59 ± 0.05 Mg ha–1) were recorded in P. deltiodes. However, soil carbon stock was recorded in E. tereticornis (37.5 ± 3.52 Mg ha–1). Thus, trees on farmlands with crops are suitable for biomass production and C allocation in different components under changing climatic scenarios.Keywords
Agroforestry System, Biomass, Carbon Stock, Carbon Dioxide Mitigation, Climate Change.Full Text
References
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- Relationship of Physiological Plant Functional Traits With Soil Carbon Stock in The Temperate Forest of Garhwal Himalaya
Abstract Views :182 |
PDF Views:74
Authors
Affiliations
1 Forest Ecology and Climate Change Division, Forest Research Institute, Dehradun 248 006, IN
1 Forest Ecology and Climate Change Division, Forest Research Institute, Dehradun 248 006, IN
Source
Current Science, Vol 120, No 8 (2021), Pagination: 1368-1373Abstract
The composition of species can play an essential role in reducing the atmospheric carbon dioxide. Forest trees are an important part of the functioning of the terrestrial ecosystem, predominantly in the cycling of carbon. However, tree physiology is much less studied than crop physiology for several reasons: a large number of species, difficulty in measuring photosynthesis of tall trees or forest species. This study aims to establish the relationship between physiological plant functional traits (photosynthesis rate, transpiration rate, stomatal conductance, leaf chlorophyll and carotenoid content) with soil carbon stock in Pinus roxburghii forest of Garhwal Himalaya. The present findings revealed that photosynthesis rate, chlorophyll a, chlorophyll b and carotenoid content positively correlated to the soil carbon stock. The different regression models also showed that photosynthesis rate with water-use efficiency, stomatal conductance and carotenoid content is a good predictor of soil carbon stock in Pinus roxburghii forest. Physiological plant functional characteristics are thus crucial for regulating the carbon cycle and ecosystem functioning in Garhwal Himalaya.Keywords
Carbon Assimilation, Ecosystem Services, Soil Carbon, Water-Use Efficiency.Full Text
References
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- Kumar, A. et al., Soil organic carbon pools under Terminalia chebula Retz. based agroforestry system in Himalayan foothills, India. Curr. Sci., 2020, 118(7), 1098–1103.
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