Valley-bottom wetland agricultural conversion and recovery shape greenhouse gas dynamics and soil carbon sequestration in an African tropical highland system
アフリカ熱帯高原地帯における谷底湿地の農地転換と回復が温室効果ガス動態と土壌炭素隔離に与える影響 (AI 翻訳)
Sharon Gubamwoyo, Sonja M. Leitner, Gabriele Weigelhofer, Damaris G. Kisha, Oswald Omuron, Dominik Henrik Zak, Thomas Hein, Gretchen M. Gettel
🤖 gxceed AI 要約
日本語
アフリカ熱帯高地の谷底湿地（HVBW）における農地転換と回復がGHG排出と炭素貯留に及ぼす影響を初めて定量評価。転換はメタン排出を減少させる代わりに亜酸化窒素の発生源に変化させ、炭素損失も顕著。回復により中期的なGHG排出削減と長期的な炭素隔離が期待されるが、国家規模での効果は限定的。
English
This study quantifies for the first time the impact of agricultural conversion and recovery of valley-bottom wetlands (HVBWs) in African tropical highlands on GHG emissions and carbon storage. Conversion shifted emissions from methane to nitrous oxide dominance and caused significant carbon loss. Recovery shows potential for functional restoration and long-term carbon sequestration, though national-scale emission offsets are modest.
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
本論文はアフリカ熱帯湿地の農地転換と回復に伴うGHG動態を実証したもので、日本国内の湿地や水田管理への直接的な示唆は限られる。ただし、土地利用変化に伴う炭素貯留・GHG排出のトレードオフ評価手法は、日本の農地・湿地管理やカーボン・オフセット事業において参考になりうる。
In the global GX context
This paper provides empirical data on GHG trade-offs in tropical wetland conversion and restoration, relevant to global land-use carbon accounting and nature-based solutions. While specific to East Africa, the methodological approach and findings on carbon sequestration vs. N₂O emissions inform IPCC guidelines and national GHG inventory improvements.
👥 読者別の含意
🔬研究者:Offers rare field data on GHG fluxes from African tropical highland wetlands, useful for carbon cycle modelers and tropical ecology researchers.
🏛政策担当者:Highlights that wetland restoration can contribute to NDC targets, but the scale of carbon offset may be limited vs. agricultural emissions.
📄 Abstract（原文）
Abstract. Tropical wetlands significantly impact greenhouse gas (GHG) budgets and carbon storage: however data from sub-Saharan African (SSA) remain limited. Highland valley-bottom wetland (HVBW) agriculture supports millions, yet its effects on GHG emissions and carbon storage remain undocumented. This study quantified soil emissions of nitrous oxide (N₂O), carbon dioxide (CO₂), and methane (CH₄) in the Taita Hills, Kenya, from 12 converted, 10 recovering, and one reference (intact) HVBWs. Agricultural conversion shifted wetland emissions from CH₄ to N₂O dominance. Converted HVBWs were N₂O sources (2.7 kg N₂O–N ha⁻¹yr⁻¹), driven by elevated soil nitrate, whereas the intact wetland was an N₂O sink (−0.3 kg N₂O–N ha⁻¹ yr⁻¹), with high soil moisture and high soil C/NO₃⁻–N ratio suggesting complete denitrification. Recovering HVBWs showed intermediate N₂O emissions (0.6 kg N₂O–N ha⁻¹ yr⁻¹). CO₂ emissions were similar between converted and recovering HVBWs (10,850 vs. 11,031 kg CO₂–C ha⁻¹ yr⁻¹) but lower in the intact (2,923 kg CO₂–C ha⁻¹ yr⁻¹). CH₄ emissions were highest in the intact HVBW (2,757 kg CH₄–C ha⁻¹ yr⁻¹), intermediate in recovering sites (879 kg CH₄–C ha⁻¹ yr⁻¹), and lowest in converted sites (37 kg CH₄–C ha⁻¹ yr⁻¹). The intact HVBW had 224 Mg C ha⁻¹, indicating carbon loss rates of 2.6 Mg C ha⁻¹ yr⁻¹ over 45 years for converted HVBWs. Restoring Taita Hills wetlands would sequester 1.1 Mg C ha⁻¹ yr⁻¹, offsetting ~0.0005 % of Kenya's annual agricultural GHG emissions, or 9.8 % when scaled nationally. These findings highlight trade-offs between GHG emissions and carbon storage in HVBWs, with wetland recovery promoting functional restoration and long-term carbon sequestration in SSA.
🔗 Provenance — このレコードを発見したソース
- crossref https://doi.org/10.5194/egusphere-2026-3028first seen 2026-06-16 05:29:43
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