Assessment of Carbon Stock and Utilization Pattern of Biomass from Different Tree Based Systems in Bihar
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Date
2023
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RPCAU, Pusa
Abstract
The present investigation was carried out in 37 villages of Pusa Block, Samastipur, Bihar, during 2021–23 to understand the agroforestry practices in the region by identifying the different tree based systems and their effects on various soil properties, soil nutrient status, and the utility pattern of farm-hold tree resources by the local population. The study has turned up six prominent tree based systems from Pusa Block. The bio-physical parameters, age, density, and specific gravity of tree species affected the volume, biomass, carbon stock, carbon dioxide sequestration potential, and carbon credit of different tree based systems. Among the systems studied, Litchi tree based systems performed well in volume (325.69 t ha-1), biomass accumulation (above-ground 415.25 t ha-1, below-ground 107.97t ha-1 and total biomass 523.22 t ha-1),carbon stock (261.61 t ha-1), carbon di-oxide mitigation potential (960.11 t ha-1), annual carbon sequestration rate(14.53 t ha-1), annual CO2 fixation rate (53.34 t ha-1) and carbon credit (14.4 lakh INR) on a per hectare basis. The performance of tree based systems in improving soil physio-chemical properties such as bulk density, soil pH, EC, soil organic carbon and stock, and available N, P, and K, was excellent compared to that of open crop field without tree systems. Among the systems recorded for the soil parameters, the Mahogany and Mausmi tree based systems were found to be superior in 0–15 cm and 15–30 cm soil depths to those of other systems, and the results indicate that tree based practices can impact positively on soil physical, chemical, and biological properties and reduce leaching and runoff, therefore augmenting ecological security. The survey conducted to determine the utilisation pattern of biomass for various utility categories resulted in the highest informant consensus factor for fibre extraction (0.994). Fidelity levels were highest in Musa paradisiaca (44.05) in fodder, Bambusa bambos (36.49) in fuel wood, Mangifera indica (85.95) in food, Bombax ceiba (41.35) in fibre, Citrus limon (52.16) in medicine, Bambusa bambos (67.30) in timber, Swietenia mahogany (2.97) in agricultural implements, Bambusa bambos (32.71) in leaf litter, and Mangifera indica (85.95) in ritual categories. The cultural importance value was highest recorded for Musa paradisiaca (1.98). The average per capita consumption from agroforestry sources in Pusa Block was recorded to be 0.051 ± 0.012 kg/ACU/day in winter, 0.076 ± 0.017 kg/ACU/day in summer, and 0.048 ± 0.011 kg/ACU/day in the rainy season. The average per capita fodder consumption from other sources in Pusa Block, Samastipur, Bihar, was recorded to be 16.752 ± 0.438 kg/ACU/day in winter, 14.315 ± 0.375 kg/ACU/day in summer, and 17.839 ± 0.648 kg/ACU/day in the rainy season. The total average per capita fodder consumption from both agroforestry and other sources in Pusa Block, Samastipur, Bihar, was recorded to be 16.804 ± 0.440 kg/ACU/day in winter, 14.392 ± 0.378 kg/ACU/day in summer, and 17.889 ± 0.65 kg/ACU/day in the rainy season. The total average per capita household consumption from both agroforestry and other sources in Pusa Block, Samastipur, Bihar, was recorded to be 6.931 ± 0.264 kg/household/day in winter, 5.996 ± 0.275 kg/household/day in summer, and 5.752 ± 0.275 kg/household/day in the rainy season, respectively. The total average per capita household consumption from both agroforestry and other sources in Pusa Block, Samastipur, Bihar, was recorded to be 2278.716 ± 99.016 kg/household/year. Per capita consumption of fuelwood (kg/capita/day) for Pusa Block depicted that the supply of fuel wood from other sources, such as forests and adjacent areas, was almost half that supplied by the agroforestry systems. It was also clear that the consumption of fuel wood was higher in the winter season. Per-household consumption of fuel wood and annual consumption also followed similar trends. Per capita consumption of fodder (kg/ACU/day) by the cattle in the study area showed that the supply of fodder from agroforestry is negligible and, in a few villages, no agroforestry tree is utilised as a source of fodder, and they solely depend on agricultural and other commercial sources of fodder. The tree based fodder utility was not familiar in the study area. The appropriate measures have to be taken to make people aware of the importance of agroforestry trees and other agroforestry practices in order to ensure sustainable lifestyles and ecological and environmental security.