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首页> 外文期刊>Limnology >Seasonal and site-specific variability in terrigenous particulate organic carbon concentration in near-shore waters of Lake Biwa, Japan
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Seasonal and site-specific variability in terrigenous particulate organic carbon concentration in near-shore waters of Lake Biwa, Japan

机译：日本琵琶湖近岸水域中陆源性颗粒有机碳浓度的季节性和特定地点变化

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摘要

Identifying sources of particulate organic matter (POM) is important for clarifying fundamental mechanisms by which lake food webs are sustained. We determined carbon and nitrogen stable isotope ratios of POM in near-shore waters of Lake Biwa, a large, meso-eutrophic lake in Japan, to estimate relative contributions of terrigenous particulate organic carbon (T-POC), plankton-derived POC (P-POC) and epilithon-derived POC (E-POC) to POC in near-shore waters. Samples were collected during different months (November, February, May and July) at 29 sites located near the mouth of tributary rivers with different discharge and catchment land use. The data revealed that POC mainly consisted of P-POC and T-POC, with relative contributions varying widely over season and among locations. E-POC generally contributed little to the near-shore POC. Path analyses revealed that the concentration of riverine POC whose isotopic signatures were similar to those of rice straws increased with a larger %paddy field area in the catchment of tributary rivers, which subsequently enhanced T-POC inputs to near-shore waters through riverine transportation. Furthermore, our results suggested that T-POC contribution was influenced, with a time lag, by wave-driven turbulence and shore topography, which appear to affect sedimentation and resuspension of T-POC.
机译：确定颗粒状有机物（POM）的来源对于阐明维持湖泊食物网的基本机制很重要。我们确定了日本琵琶湖（日本中富营养大湖）近岸水体中POM的碳和氮稳定同位素比，以估算陆生颗粒有机碳（T-POC），浮游生物来源的POC（P -POC）和近岸水域中从Epilithon衍生的POC（E-POC）到POC。在不同月份（11月，2月，5月和7月）在支流河口附近29个地点采集了样本，这些地点有不同的排放和集水区土地用途。数据显示，POC主要由P-POC和T-POC组成，相对贡献随季节和位置而变化很大。 E-POC通常对近岸POC的贡献很小。路径分析表明，在支流河流域，同位素特征与稻草相似的河流POC的浓度随着稻田面积的增加而增加，这随后通过河流运输增加了向近岸水域的T-POC投入。此外，我们的研究结果表明，波浪驱动的湍流和海岸地形对T-POC的贡献具有一定的时滞，这似乎会影响T-POC的沉积和重新悬浮。

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