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yexuqing木蟲之王 (文學(xué)泰斗)
太陽系系主任
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[交流]
Decoding drivers of carbon flux attenuation in the oceanic biological pump
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Decoding drivers of carbon flux attenuation in the oceanic biological pump 解碼海洋生物泵中碳通量衰減的驅(qū)動因素 ▲ 作者：M. Bressac, E. C. Laurenceau-Cornec et al. ▲鏈接： https://www.nature.com/articles/s41586-024-07850-x ▲摘要： 在此，我們展示了C-RESPIRE的原位實驗結(jié)果。C-RESPIRE是一種部署在多個中層深度的雙粒子攔截器和培養(yǎng)箱，用于測量微生物介導(dǎo)的顆粒有機碳（POC）通量衰減。 我們發(fā)現(xiàn)，在6個不同的海洋體系中，即POC通量的30倍范圍內(nèi)，顆粒附著微生物的降解為通量衰減的7%—29%，這意味著浮游動物在通量衰減中發(fā)揮了更大的影響作用。微生物再礦化，標準化到POC通量，在不同的地點和深度范圍20倍，在高POC通量下速率最低。 高達三倍變化的垂直趨勢與低緯度地區(qū)強烈的溫度梯度有關(guān)。與之相反，在中高緯度地區(qū)，溫度的影響較小，而垂直趨勢可能由顆粒生物化學(xué)、破碎化和微生物生態(tài)生理共同決定。馬丁曲線的解構(gòu)揭示了驅(qū)動微生物介導(dǎo)的POC通量衰減的基本機制。 ▲ Abstract： Here we present in situ experimental findings from C-RESPIRE, a dual particle interceptor and incubator deployed at multiple mesopelagic depths, measuring microbially mediated POC flux attenuation. We find that across six contrasting oceanic regimes, representing a 30-fold range in POC flux, degradation by particle-attached microbes comprised 7–29 per cent of flux attenuation, implying a more influential role for zooplankton in flux attenuation. Microbial remineralization, normalized to POC flux, ranged by 20-fold across sites and depths, with the lowest rates at high POC fluxes. Vertical trends, of up to threefold changes, were linked to strong temperature gradients at low-latitude sites. In contrast, temperature played a lesser role at mid- and high-latitude sites, where vertical trends may be set jointly by particle biochemistry, fragmentation and microbial ecophysiology. This deconstruction of the Martin curve reveals the underpinning mechanisms that drive microbially mediated POC flux attenuation across oceanic provinces. |
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