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首页> 外文期刊>Acta amazonica >Seasonal and spatial variations in limnological conditions of a floodplain lake (lake Catal?o) connected to both the Solim?es and Negro Rivers, Central Amazonia
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Seasonal and spatial variations in limnological conditions of a floodplain lake (lake Catal?o) connected to both the Solim?es and Negro Rivers, Central Amazonia

机译：与中亚亚马逊河的索利米斯河和内格罗河相连的洪泛区湖（加泰罗尼亚湖）的湖泊学条件的季节性和空间变化

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Lakes play an important role in biogeochemical, ecological and hydrological processes in the river-floodplain system. The aim of this study was to evaluate the dynamics of the limnological conditions of Catal?o Lake, an Amazon floodplain lake. Thus, some of the main limnological environment variables (O2, temperature, pH, nutrient, electrical conductivity) of the Catal?o Lake were analyzed under temporal and spacial scales. The study was conducted between November/2004 and August/2005. Sampling excursion were carried out every three months; one excursion for each of the four different hydrological periods (low water, rising water, high water and falling water). Sampling points were chosen so that it could be obtained a gradient of the distance from Negro River. Limnological profiles in Catal?o Lake showed generally acidic to slightly alcaline water, with low levels of dissolved oxygen and low concentrations of soluble reactive phosphorous. The Negro River seems to exert the main influence during the rising water period, while the Solim?es River is the principal controlling river during peak water. The Principal Component Analysis (PCA) grouped the seasonal collections by hydrological period, showing the formation of a north-south spatial gradient within the lake in relation to the limnological variables. Multivariate dispersion analysis based on distance-to-centroid method demonstrated an increase in similarity over the course of the hydrological cycle, as the lake was inundated in response to the flood pulse of the main river channels. However, the largest spatial homogeneity in the lake was observed in the epilimnion layer, during the falling water period. The daily analysis of variation indicated an oligomitic pattern during the years in which the lake was permanently connected to the Negro River. Although Catal?o Lake receives large quantities of both black water from the Negro River and sediment-filled water from the Solim?es River, the physical and chemical characteristics of the lake are more similar to those of the Solim?es (várzea lake) than the Negro (blackwater lake).
机译：湖泊在河漫滩系统中的生物地球化学，生态和水文过程中起着重要作用。这项研究的目的是评估亚马逊洪泛区湖加泰罗尼亚湖的湖泊学条件。因此，在时间和空间尺度上分析了加泰罗尼亚湖的一些主要气候环境变量（O2，温度，pH，养分，电导率）。该研究在2004年11月/ 2005年8月之间进行。每三个月进行一次抽样游览;在四个不同的水文时期（低水位，上升水位，高水位和下降水位）中的每一次游览。选择采样点是为了获得到黑人河的距离的梯度。加泰罗尼亚湖的湖泊水质概况一般显示为酸性至弱碱性水，溶解氧含量低，可溶性反应性磷含量低。在水位上升期间，黑人河似乎发挥了主要作用，而索利姆斯河则是高峰期的主要控制河。主成分分析（PCA）按水文时期对季节性收集进行了分组，显示了与湖泊学变量有关的湖泊内南北空间梯度的形成。基于距离重心法的多元分散分析表明，随着水文循环过程中相似性的增加，因为湖泊被主要河道的洪水脉冲淹没。然而，在下降的水期中，在上层层中观察到了湖中最大的空间均匀性。每天对变化的分析表明，在该湖与黑人河永久相连的年份中，存在寡聚模式。尽管Catal？o湖从黑人河接收大量黑水，从Solim？es河接收大量沉积物水，但该湖的物理和化学特征与Solim？es（várzea湖）的相似。比黑人（黑水湖）要大。

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