【學術亮點】潮汐影響紅樹林樹幹與土壤之甲烷及二氧化碳排放
【學術亮點】Tidal influence on carbon dioxide and methane fluxes from tree stems and soil in mangrove forests
Ecological Agriculture: Nature-Based Solutions for Restoring Wetland Carbon Sink under Climate Change【Department of Life Sciences / Lin, Hsing-Juh / Distinguished Professor】
生態農業：氣候變遷下以自然為本之濕地碳匯復育策略【生命科學系/林幸助特聘教授】
論文篇名 英文：Tidal influence on carbon dioxide and methane fluxes from tree stems and soil in mangrove forests
中文：潮汐影響紅樹林樹幹與土壤之甲烷及二氧化碳排放
期刊名稱 Biogeosciences
發表年份,卷數,起迄頁數 2024, 21(22), 5247-5260
作者 Yong, Zhao-Jun; Lin, Wei‐Jen; Lin, Chiao-Wen; Lin, Hsing-Juh(林幸助)*
DOI 10.5194/bg-21-5247-2024
中文摘要 紅樹林是重要的藍碳生態系統。測量紅樹林樹幹的甲烷 (CH4) 排放有可能降低碳吸存能力的不確定性。這項研究首次同時測量了整個潮汐週期中來自樹幹和土壤的CH4通量。我們量化了 Avicennia marina 和 Kandelia obovata 紅樹林樹幹在潮汐循環過程中的二氧化碳 (CO2) 和 CH4 通量，它們具有不同的根結構。紅樹林樹幹既是 CO2 的凈來源，也是 CH4 的凈來源。與土壤相比，紅樹林樹幹的CH4通量顯著降低，但CO2通量沒有差異。A. marina 的樹幹表現出從低潮到高潮的 CO2 通量增加的趨勢。另一方面，CH4 通量表現出較高的時間變異性，A. marina 的樹幹在潮汐淹沒前為 CH4 匯，退潮後成為源頭。相比之下，K. obovata 的樹幹沒有顯示出一致的 CO2 或 CH4 通量模式。根據我們的研究結果，考慮潮汐影響時，A. marina 的樹幹 CH4 通量變化高達 1200%。因此，僅在退潮時採樣可能會低估晝夜尺度上的樹幹 CO2 和 CH4 通量。本研究強調了在量化紅樹林樹榦的溫室氣體 (GHG) 通量時考慮潮汐影響的必要性。需要進一步的研究來探索驅動觀察到的通量變化的潛在機制，並提高對紅樹林生態系統中 GHG 動態的理解。
英文摘要 Mangroves are critical blue carbon ecosystems. Measurements of methane (CH4) emissions from mangrove tree stems have the potential to reduce the uncertainty in the capacity of carbon sequestration. This study is the first to simultaneously measure the CH4 fluxes from both stems and soils throughout tidal cycles. We quantified carbon dioxide (CO2) and CH4 fluxes from mangrove tree stems of Avicennia marina and Kandelia obovata during tidal cycles, which have distinct root structures. The mangrove tree stems served as both net CO2 and CH4 sources. Compared to those of the soils, the mangrove tree stems exhibited remarkedly lower CH4 fluxes, but no difference in CO2 fluxes. The stems of A. marina exhibited an increasing trend in the CO2 flux from low to high tides. On the other hand, CH4 flux showed high temporal variability, with the stems of A. marina functioning as a CH4 sink before tidal inundation and becoming a source after ebbing. In contrast, the stems of K. obovata showed no consistent pattern of the CO2 or CH4 flux. Based on our findings, the stem CH4 fluxes of A. marina could vary by up to 1200% when considering tidal influence, compared to ignoring tidal influence. Therefore, sampling only during low tides might underestimate the stem CO2 and CH4 fluxes on a diurnal scale. This study highlights the necessity of considering tidal influence when quantifying GHG fluxes from mangrove tree stems. Further research is needed to explore the underlying mechanisms driving the observed flux variations and improve the understanding of GHG dynamics in mangrove ecosystems.
發表成果與本中心研究主題相關性 紅樹林碳匯之估算