アグロフォレストリー生け垣は、南ケベック（カナダ）におけるプラスチックマルチの使用如何で土壌有機炭素蓄積を増減させる
Agroforestry hedges either increase or decrease soil organic carbon stocks depending on the use of plastic mulch in Southern Quebec (Canada). (原題)
Marc-Olivier Martin-Guay, Émilie Maillard, Vincent Poirier, David Rivest
🤖 gxceed AI 要約
日本語
南ケベックのアグロフォレストリー生け垣（AFH）36地点を隣接農地と比較し、土壌有機炭素（SOC）と樹木バイオマス炭素を定量した。全層（0-50cm）のSOCは平均6.4%減少したが、これは主に下層土の損失によるもので、成熟したAFHでは見られなかった。表層では連続プラスチックマルチがない場合SOCが24%増加したが、マルチがあると12%減少した。樹木バイオマスにより総炭素は21 Mg C/ha増加し、植栽23年目に年間3.7 Mg C/haでピークに達した。
English
Across 36 agroforestry hedges in Southern Quebec, whole-profile SOC was 6.4% lower than adjacent croplands, driven by subsoil losses that diminished in older hedges. Topsoil SOC rose 24% without continuous plastic mulch but fell 12% with it. Total C stocks still increased by 21 Mg C/ha, mainly from tree biomass, peaking at 3.7 Mg C/ha/yr at 23 years.
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
日本でも農地炭素貯留・J-クレジット農業分野の関心が高まるが、本論文は土壌炭素の管理依存性を示す基礎的知見であり、国内GX開示・政策への直接的含意は限定的。
In the global GX context
Soil carbon removals are increasingly relevant to corporate climate targets and emerging MRV frameworks, but this field-level study offers indirect implications for disclosure infrastructure. It underscores management-dependent variability that carbon accounting standards must accommodate.
👥 読者別の含意
🔬研究者:アグロフォレストリー下のSOC動態がマルチ管理等の管理慣行に強く依存することを示す実証的証拠。
🏢実務担当者:農業・食品サプライチェーン企業が土壌炭素クレジットやスコープ3土地利用排出を評価する際、管理慣行の影響を考慮すべき点。
🏛政策担当者:農地炭素貯留政策や炭素除去クレジット設計において、マルチ資材の使用がSOC利益を相殺しうる点に留意。
📄 Abstract（原文）
Agroforestry hedges (AFH), including windbreaks and riparian buffers, can mitigate climate change and improve agroecosystem resilience. Many studies report positive effects of AFH on soil organic carbon (SOC) stocks, yet outcomes remain variable. The factors controlling SOC dynamics under AFH, particularly management practices, therefore must be better understood. We quantified C stocks in soils (0-20 and 20-50 cm), tree biomass, litter and woody debris across 36 AFH located in Southern Quebec (Canada), and compared them with adjacent croplands. These AFH varied in age (5-46 years), tree composition, soil texture and mulch type (none or limited vs. continuous plastic strip). SOC stability was assessed through physical size fractionation into mineral-associated organic matter (MAOM) and particulate organic matter (POM). Contrary to expectations, SOC stocks in the whole profile (0-50 cm) were slightly lower (-6.4 ± 3.9%; mean ± SE) under AFH compared to adjacent fields, due to losses (-13 ± 4%) in the subsoil. These losses were not observed in more developed AFH, suggesting a gradual recovery over time. In the topsoil, SOC increased (+24 ± 5%) in the absence of continuous plastic strips, but decreased (-12 ± 5%) when strips were present. The labile POM fraction accounted for most SOC accrual under AFH (+67 ± 14% relative to controls without plastic strip in the topsoil), while MAOM declined across all layers. Despite these soil responses, total C stocks increased by 21 ± 7 Mg C ha-1 in AFH, mainly due to tree biomass. Biomass C sequestration peaked at 3.7 Mg C ha-1 yr-1 23 years after plantation. Our results highlight that management practices during AFH establishment can strongly influence SOC dynamics and that plastic mulch may offset potential SOC gains, even though overall C sequestration remains positive due to tree biomass accumulation.
🔗 Provenance — このレコードを発見したソース
- semanticscholar https://doi.org/10.1016/j.jenvman.2026.130930first seen 2026-09-19 05:48:14 · last seen 2026-09-22 05:15:56
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