アフリカのアグロフォレストリー景観における気候・土地利用相互作用と林冠被覆が土壌有機炭素動態を規定する
Climate–land-use interactions and canopy cover shape soil organic carbon dynamics in African agroforestry landscapes (原題)
Gannouka Nadjire, James Nana Ofori, Alimata Arzouma Bandaogo, Eunice Okyere‐Agyapong, Larba Hubert Balima, Amanuel Woldeselassie Gebremichael, Reginald Tang Guuroh, Loyapin Bondé, Oumarou Ouédraogo, Issaka Joseph Boussim, Anja Linstädter
🤖 gxceed AI 要約
日本語
ガーナとブルキナファソの4気候帯にわたり1,440土壌サンプルを分析し、土壌有機炭素（SOC）動態の規定要因を検証。気候が表土SOC変動の26.3%を説明し、気候×土地利用の相互作用は全SOC貯留量変動の34%を占めた。乾燥化が進むほど土地利用集約化の影響が増大し、農地でSOCが大きく減少。全気候帯で林冠被覆がSOC貯留に正に寄与し、アグロフォレストリーの炭素貯留機能を裏付けた。
English
Analyzing 1,440 soil samples across four climatic zones in Ghana and Burkina Faso, this study shows climate dominates topsoil SOC variation (26.3%), while climate×land-use interaction explains 34% of total SOC stock variation. Land-use intensification depletes SOC most strongly in semi-arid croplands, and tree canopy cover consistently enhances SOC storage, supporting agroforestry parklands as carbon sinks.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本企業のGX文脈ではScope 3やサプライチェーン排出、農業由来クレジットに関心が集まるが、本論文はアフリカ小農地の土壌炭素が主題で、日本の開示制度（SSBJ・有報）への直接的な接続は乏しい。ただし自然資本・生物多様性・土地由来炭素の評価手法として、TNFD対応や農業サプライチェーンの脱炭素を検討する日本企業には参考情報となりうる。
In the global GX context
This paper sits at the intersection of climate science and land-based carbon accounting, relevant to emerging nature-related disclosure (TNFD) and agricultural Scope 3 accounting. It offers empirical evidence on how climate and land-use interact to govern soil carbon in Sub-Saharan Africa, a region underrepresented in global carbon-cycle literature, though it does not directly engage TCFD/ISSB/CSRD frameworks.
👥 読者別の含意
🔬研究者:気候×土地利用の相互作用が土壌炭素を規定するメカニズムと、空間代用（space-for-time）手法の実証例を提供する。
🏢実務担当者:農業サプライチェーンや自然資本・TNFD対応を検討する企業にとって、土地管理と炭素貯留の関係を理解する基礎資料となる。
🏛政策担当者:気候帯別に調整した土壌保全・炭素管理政策の必要性を示唆し、アフリカ農業政策の設計に示唆を与える。
📄 Abstract（原文）
Climate change, land-use intensification, and agroforestry management are key drivers of soil organic carbon (SOC) dynamics in Sub-Saharan Africa, yet their combined effects remain poorly understood. Using a hierarchical space-for-time substitution approach, we analysed 1,440 soil samples from protected areas, fallows, and croplands across four climatic zones spanning a humid-to-semi-arid gradient in Ghana and Burkina Faso. We also assessed the role of tree canopy cover on SOC stocks and soil properties. Climate was the dominant driver of SOC dynamics, explaining 26.3% of the variation in topsoil SOC, while the interaction between climate and land-use accounted for 34% of the variation in total SOC stocks. The effects of land-use intensification increased along the aridity gradient, causing substantial SOC depletion in croplands within dry sub-humid and semi-arid zones, likely due to reduced organic matter inputs and limited biomass production, which exacerbate cultivation-induced carbon losses. Across all climatic zones and land-use systems, SOC stocks were positively influenced by canopy cover, highlighting the contribution of agroforestry parklands to carbon storage. Random Forest analyses identified total nitrogen as the strongest predictor of SOC stocks across climatic zones, while clay content and rainfall were important predictors of total SOC stocks. Although significant climate × land-use interactions were also observed for soil physical properties, these patterns likely reflect, at least in part, non-random land selection across pedologically heterogeneous landscapes rather than direct management effects. Our findings emphasise the importance of geographically tailored soil conservation and carbon management strategies adapted to specific climatic and edaphic contexts.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1080/27658511.2026.2736969first seen 2026-10-16 04:40:03
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