ウッタル・プラデーシュ州ミルザプール県における土地利用システム別の土壌理化学性と炭素クレジット

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🔬研究者:土壌炭素貯留と土地利用の関係に関する比較実証データを提供する。

🏢実務担当者:アグロフォレストリー導入による炭素クレジット創出可能性の参考事例となる。

🏛政策担当者:農林業由来炭素クレジット制度設計における土地利用多様化の根拠として参照可能。

Land-use systems (LUSs) fundamentally dictate soil health by influencing its physical, chemical and biological properties. In order to assess the influence of diverse land-use systems (LUSs) on soil physico-chemical properties, available nutrients, and carbon stocking in the semi-arid Vindhyan region of Uttar Pradesh, India; twelve representative LUSs comprising three ecosystems viz; agroforestry systems (karonda, guava, custard apple, and bael orchards with intercrops), agroecosystem (berseem, sugarcane, sorghum, and Pigeon Pea ), and forest ecosystems (mixed deciduous, subabul, ber, and bamboo) were evaluated in Randomized Completely Block Design (RCBD) at two soil depths (0-15 cm and 15-30 cm) with three replications. Soil samples were analysed for bulk and Particle density, pH, soil organic carbon (SOC), and available macronutrients (N, P, K, and S), along with biomass production, carbon stock, CO2 sequestration, and carbon credit potential. Significant variations were observed among the LUSs and soil depths. Pigeon pea fields recorded the highest bulk density, whereas the Ziziphus mauritiana forest exhibited the lowest. Soil pH was highest under pigeon pea (7.53–7.70) and lowest in bael-based agroforestry (6.13–6.40). Mixed species forest demonstrated superior soil health with the highest SOC content (0.87–0.91%) and SOC stock (17.56–18.08 t ha.¹), while sorghum fields recorded the lowest values. Forest systems also exhibited substantially greater biomass production and carbon sequestration potential, with mixed species forest recording the highest total biomass (85.39 t ha.¹), carbon stock (42.70 t ha.¹), annual carbon accumulation (3.28 t ha.¹ yr.¹), and CO2 sequestration (156.69 t ha.¹), followed by Leucaena leucocephala forest. Consequently, mixed species forest generated the highest carbon credit (.46,790.35 ha.¹ yr.¹), whereas berseem fields recorded the lowest returns. Across all systems, SOC and nutrient availability declined with increasing soil depth. The findings emphasise that forest- and agroforestry-based land uses improve soil health, enhance nutrient cycling, and provide greater carbon storage, sequestration, and credit potential compared to a solo agroecosystem. Therefore, promoting diversified land use, particularly agroforestry, stands as a cornerstone strategy for building sustainable and climate-resilient agrifood systems in vulnerable semi-arid regions.

• openalex https://doi.org/10.5071/34theubce2026-1dv.4.14first seen 2026-10-10 05:11:58