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Effects of Different Saline-Alkaline Conditions on the Characteristics of Phytoplankton Communities in the Lakes of Songnen Plain China

機(jī)譯：不同鹽堿??條件對松嫩平原湖泊浮游植物群落特征的影響

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Many lakes located in the Songnen Plain of China exhibit a high saline-alkaline level. 25 lakes in the Songnen Plain were selected as research objects in this study. Water samples in these lakes were collected from June to August in 2008. Total Dissolved Solids (TDS) and Total Alkalinity (TA) were measured to assess the saline-alkaline level, and partial canonical correspondence analysis (CCA) was conducted as well. The results show that the majority of these lakes in the study area could be categorized into HCO3−-Na+-I type. According to the TDS assessment, of the total 25 lakes, there are 14 for freshwater, 7 for brackish water and 4 for saltwater; and the respective range of TA was from 0.98 to 40.52. The relationship between TA and TDS indicated significant linear relationship (R2 = 0.9292) in the HCO3−-Na+-I type lakes in the Songnen Plain. There was a general trend that cell density, genera richness and taxonomic diversity decreased with the increase of saline-alkaline gradient, whereas a contrary trend was observed for the proportion of dominant species. When the TDS values were above 3×103mg/L and the TA values were above 15mg/L, there was a significant reduction in cell density, genera richness and biodiversity, and their corresponding values were respectively below 10×106 (ind/L), 15 and approximately 2.5. Through the partial canonical correspondence analysis (CCA), 10.7% of the genera variation was explained by pure saline-alkaline variables. Cyclotella meneghiniana, Melosira ambigua and Melosira granulate were found to become the dominant species in most of these lakes, which indicated that there may be rather wide saline-alkaline niches for common dominant species. About one-quarters of the genera which have certain tolerance to salinity and alkalinity preferred to live in the regions with relatively higher saline-alkaline levels in this study.
機(jī)譯：中國松嫩平原上的許多湖泊都表現(xiàn)出較高的鹽堿水平。本研究選擇了松嫩平原的25個湖泊作為研究對象。這些湖泊的水樣本是在2008年6月至8月收集的。測量了總?cè)芙夤腆w（TDS）和總堿度（TA）以評估鹽堿水平，并且還進(jìn)行了部分規(guī)范對應(yīng)分析（CCA）。結(jié)果表明，研究區(qū)這些湖泊中的大多數(shù)可分為HCO3 - -Na + -I型。根據(jù)TDS評估，在總共25個湖泊中，淡水14個，咸水7個，咸水4個。 TA的范圍為0.98至40.52。 TA和TDS之間的關(guān)系表明HCO3 - -Na + -I型湖泊中HCO3 - -Na + -I型湖泊具有顯著的線性關(guān)系（R 2 = 0.9292）。松嫩平原?？偟内厔菔牵S著鹽堿梯度的增加，細(xì)胞密度，屬豐富度和分類學(xué)多樣性降低，而優(yōu)勢種的比例卻出現(xiàn)相反的趨勢。當(dāng)TDS值大于3×10 3 mg / L且TA值大于15mg / L時，細(xì)胞密度，屬豐富度和生物多樣性均顯著降低，其對應(yīng)值分別為低于10×10 6 （ind / L），15和大約2.5。通過部分規(guī)范對應(yīng)分析（CCA），純鹽堿變量解釋了10.7％的屬變異。在大多數(shù)這些湖泊中，發(fā)現(xiàn)了青蟹氣單胞菌，印度細(xì)毛比目魚和細(xì)毛比目魚顆粒成為優(yōu)勢種，這表明常見的優(yōu)勢種可能有相當(dāng)寬的鹽堿位。在這項研究中，約有四分之一的屬對鹽堿度有一定的耐受性，優(yōu)選生活在鹽堿水平相對較高的地區(qū)。

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