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首页> 外文期刊>Marine ecology progress series >Dissolved organic matter from tropical peatlands reduces shelf sea light availability in the Singapore Strait, Southeast Asia
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Dissolved organic matter from tropical peatlands reduces shelf sea light availability in the Singapore Strait, Southeast Asia

机译：来自热带泥炭地的溶解有机物在新加坡海峡，东南亚的货架海灯可用性降低了货架海灯

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Shelf seas provide valuable ecosystem services, but their productivity and ecological functioning depend critically on sunlight transmitted through the water column. Anthropogenic reductions in underwater light availability are thus a serious threat to coastal habitats. The flux of light-absorbing coloured dissolved organic matter (CDOM) from land to sea may have increased world-wide, but how this has altered the availability and spectral quality of light in shelf seas remains poorly known. We present time-series data from the Sunda Shelf in Southeast Asia, where the monsoon-driven reversal in ocean currents supplies water enriched in CDOM from tropical peatlands for part of the year, resulting in 5- to 10-fold seasonal variation in light absorption by CDOM. We show that this terrigenous CDOM can dominate underwater light absorption at wavelengths up to 500 nm, and shift the underwater irradiance spectrum towards longer wavelengths. The seasonal presence of terrigenous CDOM also reduces the 10% light penetration depth by 1-5 m, or 10-45%. We estimate that on average 0.6 m, or 25%, of this terrigenous CDOM-mediated shoaling might be attributable to the enhanced input of dissolved organic matter following peatland disturbance. The seasonal change in the light environment is correlated with changes in phytoplankton absorption spectra that suggest a photo-acclimation response, and we infer that terrigenous CDOM likely contributes to limiting the depth distribution of photosynthetic corals. The results reveal an ecologically important but largely overlooked impact of human modifications to carbon fluxes that is likely increasingly important in coastal seas.
机译：货物海洋提供有价值的生态系统服务，但它们的生产力和生态功能依赖于通过水柱传输的阳光尺寸依赖。因此，水下光可用性的人为减少对沿海栖息地的严重威胁。从陆地到海上的光吸收有机物（CDOM）的助焊剂可能增加了全世界的增加，但这改变了货物中光的可用性和光谱质量仍然是众所周知的。我们从东南亚的Sunda架子提供时间序列数据，其中季风驱动的逆转海洋逆转在一年中的热带泥炭地提供富集CDom的水，导致光吸收中的5至10倍季节性变化由CDOM。我们表明，这种人的CDOM可以以高达500nm的波长支配水下光吸收，并将水下辐照谱移向更长的波长。令人害怕的CDOM的季节性存在也将10％光穿透深度降低1-5米或10-45％。我们估计平均0.6米或25％，这种人的CDOM介导的粪便可能因泥炭地干扰后的溶解有机物的增强输入而归因于增强。光线环境的季节变化与浮游植物吸收光谱的变化相关，表明了照片适应响应，我们推断植物CDOM可能有助于限制光合珊瑚的深度分布。结果揭示了对沿海地区可能越来越重要的碳通量的生态重要性但主要忽略了对碳通量的影响。

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