生態農業：農業溫室氣體減量【生命科學系/林幸助特聘教授】
| 論文篇名 | 英文：Effects of sediment characteristics on carbon dioxide fluxes based on interacting factors in unvegetated tidal flats 中文：底質特性對於潮間帶灘地二氧化碳通量之影響 |
| 期刊名稱 | Frontiers in Marine Science |
| 發表年份,卷數,起迄頁數 | 2021, 8, no.670180. |
| 作者 | Lin, Wei-Jen; Chiu, Ming-Chih; Lin, Chiao-Wen; Lin, Hsing-Juh(林幸助)* |
| DOI | 10.3389/fmars.2021.670180 |
| 中文摘要 | 沒有植被生長的潮間帶灘地廣泛分佈於沿海潮間帶地區，其淨基礎生產量可能不亞於紅樹林、海草床與鹽沼，但是影響潮間帶灘地二氧化碳排放量的因素仍不清楚。本研究分別於2011年至2016年間的夏、冬季測量位於台灣海峽兩岸9處熱帶與亞熱帶潮間帶灘地最大總生產量(maximum gross primary production, GPPm)、總呼吸量(total respiration, TR)及淨生產量(net primary production, NCP)，並利用結構方程式(SEM)探討底質影響這些作用的直接與間接關係。結果顯示，冬季期間GPPm及NPP高於夏天，然而夏季期間TR較高。有些地區夏天之NPP轉成負值，顯示成為碳源。GPPm、TR及NPP接隨著底泥含量增加而升高。SEM分析結果顯示底泥含量直接提升GPPm，但間接藉由藻種組成改變提升GPPm。底泥含量也直接提升TR，但間接藉由增加有機質含量提升TR，但是藻類或動物生物量對於TR沒有明顯影響。由此可見，潮間帶灘地的基礎生產量主要由有機質含量提升，而非微藻生物量，因此土壤特性對於潮間帶灘地碳通量是重要影響因素。 |
| 英文摘要 | The contribution of unvegetated tidal flats to global net primary production is comparable to that of some vegetated coastal habitats. However, compared to carbon flux regulating factors in vegetated habitats, those in unvegetated tidal flats are not well understood, particularly in terms of their cause-effect relationships. Maximum gross primary production (GPPm), net primary production (NPP) and total respiration (TR) during emersion at noon when the irradiance level was at the saturation level for photosynthesis in nine unvegetated tidal flats across the Taiwan Strait in tropical and subtropical regions were determined in winter and summer from 2011 to 2016 to examine the direct and indirect relationships between sediment characteristics and carbon fluxes by using structural equation models (SEM). Most of the GPPm and NPP values were higher in winter than in summer. Conversely, the TR values were higher in summer than in winter. The NPP values at some sites shifted to negative values in summer, indicating the sites were carbon sources. The values of GPPm, TR and NPP for the tidal flats all increased significantly with increasing sediment mud content. The SEM results showed that the sediment mud content directly increased GPPm or indirectly increased GPPm via a compositional shift in benthic microalgae. The sediment mud content also directly increased TR or indirectly increased TR via increased organic matter content. The contribution of benthic microalgal and macrofaunal biomass to TR was relatively minor. This result suggests that primary production was stimulated mainly by the organic matter content rather than by increased microalgal biomass. With the integrated SEM framework, our results showed mechanistic evidence of how sediment mud content acted as a critical factor regulating carbon fluxes in unvegetated tidal flats. |
| 發表成果與本中心研究主題相關性 | 探討自然生態系統溫室氣體排放機制 |
