Assessment of Growth, Carbon Stock and Sequestration Potential of Oil Palm Plantations in Mizoram, Northeast India

摘要

A study was conducted to assess growth, carbon stock and sequestration potential of oil palm plantations along a chronosequence in Mizoram, Northeast India for which a total of 148 oil palms drawn from different age group plantations (1 to 11 years) were sampled for their biometric parameters and assessment of carbon stock through partial non-destructive methods. All the growth parameters of oil palm (trunk height, crown depth, total height, trunk diameter) and biomass drew from different parts of the palm showed a significant (p < 0.05) progressive growth along a chronosequence. Crown biomass was observed higher (65.00%) in younger age groups 1 - 3 years, while the trunk with old frond bases biomass showed a larger percentage (67.96%) in the older oil palm aged 4 - 11 years. All the linear correlations between the growth variables with age and biomass were observed significant at p < 0.01. Total above ground biomass (AGB) was highly correlated with the trunk height (r = 0.985), total height (r = 0.994) and age (r = 0.973). On an average, portioning of biomass and carbon stock was in the order: AGB > belowground biomass (BGB) > standing litter biomass > deadwood biomass > understorey biomass. AGB, BGB and deadwood biomass followed an increasing trend while understorey biomass decreased with age. An 11-year oil palm plantation accumulated 111.96 Mg ha~(-1) biomass with a carbon density of 49.90 Mg C ha~(-1) and could sequester 3.70 Mg C ha~(-1) year~(-1) in 10 years after planting in Mizoram, Northeast India. The findings showed considerable carbon storage with comparative higher values in oil palm plantations than shifting cultivation fallows. This will enable policy and decision makers in framing climate change mitigation and adaptation policies regarding the extension of oil palm plantations in Mizoram.