インド・ジャールカンド州半湿潤熱帯におけるJan Van Yojna社会林業制度下の混植・単植造林のバイオマス炭素貯留、CO2削減ポテンシャル、グリーン経済評価の比較

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🔬研究者:小規模造林の炭素貯留をIPCC Tier-1で定量化する実践的手法と混植優位性の実証データを提供する。

🏢実務担当者:NbS・森林クレジットの価値算定や生物多様性スタッキングの考え方を自社調達・オフセット検討に応用できる。

🏛政策担当者:社会林業制度とグリーンクレジット制度の設計において、混植推進が緩和価値を高める根拠として参照できる。

Abstract Tropical forest plantations under community-based schemes represent an underexplored yet critical nexus between land-use policy, climate change mitigation, and green economy valuation. This study provides the first quantitative assessment of biomass carbon storage, CO₂ mitigation potential, and carbon credit value for two contrasting Jan Van Yojna plantation sites in semi-humid tropical Ranchi district, Jharkhand, India: a seven-species polyculture stand at BUDMU (652 trees, 2.2 acres) and a monoculture Tectona grandis stand at ANGADA (500 trees, 2.0 acres), both established in 2016. Carbon stock was quantified through field measurements of DBH, FSI regression-based volume estimation, species-specific wood density, Walkley–Black titration for carbon factor determination, and IPCC Tier-1 methodology for CO₂ equivalence conversion (factor: 44/12 = 3.667). The BUDMU polyculture site sequestered a total of 15.32 tonnes of carbon (56.19 tonnes CO₂e), with Gmelina arborea (Gamhar) as the dominant species contributing 58.80% (33.04 tonnes CO₂e), followed by Tectona grandis (18.44%; 10.36 tonnes CO₂e) and Dalbergia sissoo (10.92%; 6.14 tonnes CO₂e). The ANGADA monoculture stored 5.92 tonnes carbon (21.71 tonnes CO₂e), exclusively in Tectona grandis . BUDMU’s carbon stock was 2.59× higher than ANGADA’s, driven by species diversity and the presence of high-biomass Gmelina arborea . Per-tree Tectona carbon density was marginally higher in the mixed stand (12.28 kg/tree vs. 11.84 kg/tree), suggesting facilitative inter-specific interactions. Component-wise analysis revealed stem dominance in most species (stem > root > branch > leaf), with exceptions in Swietenia macrophylla and Emblica officinalis (branch > stem > root > leaf). Carbon credit valuation under the Voluntary Carbon Market (VCM) ranges from USD $280.93–$842.79 for BUDMU and USD $108.56–$325.68 for ANGADA; combined credits under India’s Green Credit Programme (GCP, 2023) total ₹50,634. These findings establish that polyculture Jan Van Yojna plantations generate measurably higher climate mitigation value and green economy returns than equivalent monoculture stands, with implications for REDD+ baselines, State Action Plans on Climate Change, and biodiversity-stacked NbS finance in the Indian tropics.

• openalex https://doi.org/10.1007/s44415-026-00142-4first seen 2026-11-05 04:57:19 · last seen 2026-11-06 04:37:00