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首页> 外文期刊>Journal of Freshwater Ecology >Diel Variation Related to Thermal Mixing in a Subtropical and in a North-Temperate Shallow Floodplain Lake
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Diel Variation Related to Thermal Mixing in a Subtropical and in a North-Temperate Shallow Floodplain Lake

机译：亚热带和北温带浅洪泛区湖中与热混合有关的狄尔变化

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摘要

Shallow floodplain habitats connected to large rivers undergo seasonal flooding making them integral parts of large river ecosystems. In tropical and subtropical regions, water mixing in these habitats is described as polymictic, yet little description exists for other large river floodplain lakes. In this study, the effect of thermal input on diel mixing was compared between subtropical Gal-gas Lake (GL)(1.2 m depth) connected to the Parana River, Brazil and temperate Crane Lake (CL)(0.5 m depth) connected to the Illinois River, USA. Physical, chemical, and microbial variables were measured at 3 h intervals on clear, nearly windless (avg. < 1.2 m s(-1)) days in summer (GL, 8-9 Jan 02; CL, 8-9 Aug 02). Nocturnal, convective mixing was evident for temperature (range: GL, 28-33 degrees C; CL, 23-32 degrees C) and oxygen (range GL. 23-196%; CL: 24-200%) in each system by nightfall (1930h) and correlated with differences in nitrate and ammonia. Although total bacterial density differed between surface and bottom water samples by afternoon. it was similar at both depths by evening (CL, 2230h) or early morning (GL, 430h). Did l mixing occurred in both systems and has important implications in nutrient cycling, coupling of oxic-anoxic processes. and distribution of microbiota.
机译：与大河相连的浅滩平原生境经历了季节性洪水，使其成为大河生态系统的组成部分。在热带和亚热带地区，这些生境中的水混合被描述为多学科的，但对其他大型河漫滩湖几乎没有描述。在这项研究中，比较了热输入对diel混合的影响，方法是连接巴西巴拉那河的亚热带Gal-gas Lake（GL）（深度为1.2 m）和连接到巴西的温带起重机湖（CL）（深度为0.5 m）。美国伊利诺伊河。在夏季（GL，02年1月8日至9日; CL，8月8日至9日），晴天，近无风（平均<1.2 m s（-1））上，每隔3小时测量一次物理，化学和微生物变量。夜幕降临时，每个系统的温度（范围：GL，28-33摄氏度; CL，23-32摄氏度）和氧气（GL。23-196％; CL：24-200％）在夜间对流混合明显（1930h）并与硝酸盐和氨的差异相关。尽管下午之前地表水和底水样品的总细菌密度有所不同。在傍晚（CL，2230h）或清晨（GL，430h）的两个深度都相似。在这两个系统中是否都发生了混合，这对养分循环，氧化-缺氧过程的耦合具有重要意义。和微生物群的分布。

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