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首页> 外文期刊>Polar biology >The effect of melting treatments on the assessment of biomass and nutrients in sea ice (Saroma-ko lagoon, Hokkaido, Japan)
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The effect of melting treatments on the assessment of biomass and nutrients in sea ice (Saroma-ko lagoon, Hokkaido, Japan)

机译：融化处理对海冰中生物量和营养物评估的影响（日本北海道佐良湖泻湖）

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摘要

Melting of sea-ice samples is an inevitable step in obtaining reliable and representative measurements for biogeochemical parameters such as inorganic nutrients and particulate matter. The impact of the sea-ice melting procedure has been previously evaluated for biological parameters such as chlorophyll a and cell abundance. For nutrient and biomass concentrations in sea ice, it is generally considered to be best practice to melt samples fast; however, no systematic evaluation exists in literature. The impact of melting temperature and buffer addition to avoid osmotic shock was tested on ice samples in Saroma-ko Lagoon on the northeastern coast of Hokkaido, Japan. The focus was on inorganic nutrient concentrations (NO3-, NO2-, PO4-, NH4+, Si(OH)(4)) and particulate organic carbon and nitrogen concentrations and their isotope ratios. Coherent small changes have been observed for the parameter related to nitrogen, suggesting marginal cell lysis of a specific part of the microbial community. When differences are statistically significant, they are close to the uncertainty of the measurements and small in regard to the expected natural variation in sea ice. Our study suggest a minimal effect between melting treatments on biomass (POC, PN, and Chl a) and nutrient measurements in diatom-dominated sea ice and should be repeated where the sympagic community is dominated by flagellates.
机译：海冰样品的融化是获取生物地球化学参数（例如无机养分和颗粒物）可靠且具有代表性的测量结果的必然步骤。先前已经评估了海冰融化程序的影响，以评估诸如叶绿素a和细胞丰度等生物学参数。对于海冰中的营养物和生物质浓度，通常认为最佳方法是快速融化样品。但是，文献中没有系统的评价。在日本北海道东北海岸的Saroma-ko泻湖的冰样品上测试了融化温度和添加缓冲液以避免渗透压冲击的影响。重点是无机养分浓度（NO3-，NO2-，PO4-，NH4 +，Si（OH）（4））以及颗粒有机碳和氮的浓度及其同位素比。已经观察到与氮有关的参数的连贯的小变化，表明微生物群落特定部分的边缘细胞裂解。当差异具有统计学意义时，它们接近于测量的不确定性，而与预期的海冰自然变化相比则很小。我们的研究表明，在硅藻为主的海冰中，融化处理对生物量（POC，PN和Chla）和营养物的测量之间的影响极小，在以鞭毛虫为主的交感群落中应重复进行。

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