Substrate Carbon Controls Regional Divergence of Wetland Biofilm Carbon Sinks under Climate Warming
基質炭素が温暖化下における湿地バイオフィルム炭素吸収源の地域的分岐を制御する (AI 翻訳)
K Wang, Pengfei Sun, Junzhuo Liu, Ying Xu, Wenyuan Lu, Yonghong Wu, Pete Smith
🤖 gxceed AI 要約
日本語
中国の水田サイトの解析から、土壌有機炭素（SOC）濃度がバイオフィルムの炭素固定能と温暖化への応答を左右する閾値（約20 g/kg）を特定。SOCが低い地域では温暖化により炭素固定が増加するが、高い地域では減少する。将来予測では、高SOC地域での損失が低SOC地域の増加を上回り、中国全体で約0.7 Tg Cの減少が見込まれる。
English
Analysis of 1080 rice-paddy sites across China reveals a threshold (~20 g/kg) in soil organic carbon (SOC) that governs biofilm carbon sink responses to warming. Below the threshold, warming increases carbon fixation; above it, fixation declines. Projections indicate a net loss of about 0.70 Tg C by 2100 under high-emission scenario, driven by losses in high-SOC regions partially offset by modest gains in low-SOC regions.
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
日本においても水田や湿地の炭素吸収源評価は重要であり、本論文の示す基質状態依存的な応答は、国内の炭素循環モデルやJCM（二国間クレジット制度）における吸収源クレジットの算定に示唆を与える。
In the global GX context
This study introduces a substrate-state-dependent framework for wetland carbon-climate feedbacks, challenging linear assumptions in global carbon models. The threshold concept could improve IPCC-tiered assessments and inform nature-based solution strategies globally.
👥 読者別の含意
🔬研究者:Provides empirical evidence of substrate-controlled climate sensitivity in wetland biofilm carbon sinks, with implications for carbon cycle modeling and threshold-based predictions.
🏛政策担当者:Highlights the need to incorporate soil carbon thresholds into national carbon sink inventories and climate mitigation planning, especially for rice paddy ecosystems.
📄 Abstract（原文）
Microbial biofilms at soil–water interfaces mediate carbon exchange between soils and the atmosphere, yet whether substrate state alters their climate sensitivity remains poorly understood. Here, we analyzed 1080 rice-paddy sites across 26 regions of China to test whether soil organic carbon (SOC) regulates periphytic biofilm organic carbon (PB-TOC) responses to warming. SOC emerged as the dominant predictor of PB-TOC and showed a statistically supported threshold at ∼20 g kg –1 . Below this threshold, PB-TOC increased with SOC and was positively associated with mean annual temperature and precipitation, consistent with a substrate-limited compensatory response. Above the threshold, PB-TOC approached saturation, and climate associations became negative, indicating greater vulnerability of carbon-rich interfaces. CMIP6-based projections suggest that under SSP5–8.5, China’s paddy-interface biofilm carbon pool could decline by about 0.70 Tg C by 2100, driven mainly by 4.5–6.8% losses in high-SOC regions that are only partly offset by modest gains in low-SOC regions (0.8–1.5%). These findings indicate that wetland climate responses are state-dependent and that substrate thresholds should be incorporated into carbon–climate assessments.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1021/acs.est.6c03534first seen 2026-07-13 06:08:24
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