Suggested classification of stream trophic state: Distributions of temperate stream types by chlorophyll, total nitrogen, and phosphorus
Suggested classification of stream trophic state: Distributions of temperate stream types by chlorophyll, total nitrogen, and phosphorus
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DOI：
10.1016/s0043-1354(97)00370-9
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发表时间：
1998-05-01
期刊：
影响因子：
12.8
通讯作者：
Welch, EB
中科院分区：
文献类型：
--
作者：
Dodds, WK;Jones, JR;Welch, EB
水生科学家和管理者没有常规的机制来描述和比较更广泛背景下溪流中的营养物质和藻类生物量，类似于湖泊中叶绿素（chl）和营养物质的营养状态分类。我们分析了大量不同的温带河流站点的已发表数据，包括平均底栖chl （n = 286）、最大底栖chl （n = 176）、静态chl （n = 292）和总氮（n = 1070）；总磷（n = 1365）作为建立营养界限标准的第一个努力。提出了两种分类系统。在第一个系统中，贫营养和中营养类别之间的边界由值累积分布的下三分之一定义。中营养化-富营养化边界由分布的上半部分定义。在第二个系统中，通过评估具有更高或更低营养和chl值的溪流的比例，将单个溪流更精确地置于广泛的地理环境中。提出的河流关系与公布的湖泊营养标准进行了比较。建议的河流营养边界通常比传统的湖泊标准在中营养范围内包含更大的范围。河流中最大底栖生物chl与平均chl的比值显著高于湖泊中浮游生物chl的比值，反映了河流中的差异更大。河流的这种高度变化表明，所提出的河流营养标准应仅被视为对河流生态系统进行分类的一般第一方法。1998爱思唯尔科学有限公司版权所有。
Aquatic scientists and managers have no conventional mechanism with which to characterize and compare nutrients and algal biomass in streams within a broader context analogous to trophic state categorization in lakes by chlorophyll (chl) and nutrients. We analyzed published data for a large number of distinct, temperate, stream sites for mean benthic chl (n = 286), maximum benthic chl (n = 176), sestonic chl (n = 292), total nitrogen (n = 1070); and total phosphorus (n = 1365) as a first effort to establish criteria for trophic boundaries. Two classification systems are proposed. In the first system, the boundary between oligotrophic and mesotrophic categories is defined by the lower third of the cumulative distribution of the values. The mesotrophic-eutrophic boundary is defined by the upper third of the distribution. In the second system, individual streams are placed more precisely in a broad geographic context by assessing the proportion of streams that have greater or lesser nutrient and chl values. The proposed relationships for streams were compared to trophic criteria published for lakes. The proposed trophic boundaries for streams generally include a broader range of values in the mesotrophic range than conventional criteria for lakes. The ratio of maximum to mean benthic chl for streams was significantly higher than that found for planktonic chl in lakes, reflecting the greater variance in streams. This high variance in streams suggests that the proposed stream trophic criteria should be viewed only as a general first approach to categorizing stream ecosystems. (C) 1998 Elsevier Science Ltd. All rights reserved.