商業農地における0~20cm表土有機炭素濃度・蓄積量のペア変化とIPCCティア1算定ベンチマーク
Paired 0–20 cm Topsoil Organic Carbon Concentration and Stock Changes and an IPCC Tier 1 Accounting Benchmark in Commercial Cropland (原題)
Žygimantas Kidikas, Gediminas Zdanavičius, Vilma Naujokienė
🤖 gxceed AI 要約
日本語
リトアニア南東部の商業農場(528ha、19圃場)で、2023年春から2025年秋にかけて0~20cm表土の有機炭素濃度・蓄積量をペアで測定し、IPCCティア1算定と比較した。実測では面積加重平均SOC濃度が3.003%から2.866%へ低下し、炭素蓄積も−5.05 Mg C ha−1減少した。一方IPCCティア1は0~30cm・20年移行期間で増加を予測し、測定層・期間の不一致が結果の乖離を生むことを示した。
English
Paired topsoil (0–20 cm) SOC measurements on a 528 ha Lithuanian commercial farm showed declining concentration (3.003%→2.866%) and stock (−5.05 Mg C ha−1) over 2023–2025. IPCC Tier 1 accounting instead predicted gains, but for 0–30 cm over a 20-year transition. The mismatch highlights layer/period inconsistencies between measured and inventory-based SOC estimates.
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
土壌炭素はScope 3・農業由来排出やネイチャー関連開示の基礎データとなり得る。日本では農地炭素貯留(J-クレジット等)やSSBJのバリューチェーン開示に関心が高まりつつあり、実測とIPCC算定の乖離は国内の炭素クレジット算定精度を考える上で示唆がある。
In the global GX context
Soil carbon accounting underpins agricultural Scope 3, nature-related disclosure (TNFD), and carbon-removal markets. This study's demonstration that measured SOC and IPCC Tier 1 estimates diverge due to layer and timeframe mismatches is directly relevant to ISSB/CSRD value-chain reporting and to the credibility of soil-carbon credits globally.
👥 読者別の含意
🔬研究者:実測SOCとIPCCティア1算定の量的不一致を層・期間の違いから整理した実証例として参考になる。
🏢実務担当者:農業・食品企業が土壌炭素をScope 3やクレジットで扱う際、算定手法と測定層の整合に注意が必要だと分かる。
🏛政策担当者:土壌炭素インベントリや農業炭素クレジット制度の設計で、実測と算定モデルの乖離をどう扱うかの論点を提供する。
📄 Abstract(原文)
Soil organic carbon (SOC) monitoring is important for climate change mitigation and sustainable agricultural management, but site-specific observations and Intergovernmental Panel on Climate Change (IPCC) inventory estimates need not define the same quantity. This study quantified paired changes in laboratory-measured organic carbon concentrations in the 0–20 cm layer between spring 2023 and late autumn 2025, alongside an IPCC Tier 1 accounting benchmark. The study covered a 528.06 ha mixed-tillage commercial farm in Southeastern Lithuania, comprising 19 agricultural fields. In each campaign, 119 georeferenced composite samples were collected within fixed management-zone footprints established using the EM38-MK2 apparent electrical conductivity, Sentinel-2 Normalized Difference Vegetation Index data, and geographic information system data. Laboratory-determined total organic carbon was used operationally as SOC. The whole-farm area-weighted mean SOC concentration decreased from 3.003% to 2.866%, and area-weighted field-level paired changes showed a downward shift (Wilcoxon signed-rank test, p = 0.040), with carbon stock-determined values of 71.82 and 66.76 Mg C ha−1 (difference, −5.05 Mg C ha−1; field-level p = 0.049). In comparison, the IPCC Tier 1 scenario forecast yielded +0.0382 to +0.0440 Mg C ha−1 yr−1 for 0–30 cm under the default 20-year transition. However, the measured stocks represented the 0–20 cm layer over three growing seasons, whereas the IPCC estimates represented the 0–30 cm layer and a default 20-year transition period. Parallel presentation therefore illustrates an estimated mismatch and associated monitoring requirements compared to Tier 1 predictive performance. Continued, seasonally aligned sampling to 30 cm, campaign-specific bulk density measurement, and explicit uncertainty analysis are required to evaluate persistent SOC stock trends.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.3390/app16178669first seen 2026-09-20 04:34:15
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