自然生態系の転換は土壌微生物ネクロマス炭素を減少させる
Natural ecosystem conversion depletes soil microbial necromass carbon (原題)
Pengpeng Duan
🤖 gxceed AI 要約
日本語
本研究は、自然生態系の転換が土壌微生物ネクロマス炭素（MNC）を減少させることを、619件のペア観測と機械学習モデルで実証。森林転換で損失が最も大きく、真菌ネクロマスが細菌より強く影響を受ける。微生物バイオマス減少が主因で、炭素利用効率は不変。高緯度・熱帯で脆弱性が高く、気候変動シナリオで格差が拡大する。
English
This study demonstrates that natural ecosystem conversion reduces soil microbial necromass carbon (MNC), based on 619 paired observations and machine-learning projections. Losses are strongest after forest conversion, with fungal necromass more affected than bacterial. The primary driver is reduced microbial biomass, not lower carbon-use efficiency. Vulnerability is highest at high northern and tropical latitudes, widening under climate change scenarios.
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
日本の農地転換や森林管理における土壌炭素貯留の評価に示唆を与える。SSBJや気候関連開示での土地関連排出・除去の算定根拠として、微生物由来炭素の動態理解が重要となる。
In the global GX context
This research contributes to global understanding of soil carbon dynamics under land-use change, relevant for nature-based climate solutions and carbon accounting frameworks such as IPCC guidelines and TCFD/ISSB disclosures on land-related emissions.
👥 読者別の含意
🔬研究者:Provides empirical evidence linking microbial necromass to land conversion, useful for soil carbon models and climate feedback research.
🏢実務担当者:Informs land management decisions to preserve soil carbon stocks, relevant for sustainability reporting and carbon offset projects.
🏛政策担当者:Highlights the importance of protecting natural ecosystems to maintain soil carbon sinks, supporting land-use policies and climate targets.
📄 Abstract（原文）
Microbial necromass forms a large and persistent component of soil organic carbon (SOC), yet its global response to natural ecosystem conversion and its relationship with microbial carbon use efficiency (CUE) remain unresolved. We synthesized 619 paired observations of microbial necromass carbon (MNC) from 37 studies and 62 paired observations of CUE from 8 studies, combined these data with 60 forest and cropland soil samples collected along a climatic transect in southwest China, and developed scenario-based global projections. Natural ecosystem conversion reduced MNC content on average, with the strongest losses following forest conversion and with fungal necromass responding more strongly than bacterial necromass. Microbial CUE remained unchanged at both global and regional scales, whereas microbial biomass and growth declined. Thus, reduced necromass accumulation reflected contraction of the living microbial precursor pool rather than lower carbon allocation efficiency. Hierarchical partitioning and structural equation models further associated MNC losses with microbial biomass depletion, altered soil resource stoichiometry, moisture limitation, and mineral context, and linked MNC changes to SOC responses. Machine-learning projections identified the greatest vulnerability to conversion-induced MNC loss at high northern and tropical-to-subtropical latitudes, and widening contrasts from SSP1-2.6 to SSP5-8.5. These findings show that natural ecosystem conversion weakens the soil microbial carbon pump primarily by reducing microbial biomass production, while multivariate climate change may redistribute where this vulnerability is greatest.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.6084/m9.figshare.33289428first seen 2026-09-08 04:37:02 · last seen 2026-09-10 04:36:04
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