Identifying and characterizing dominant plants as an indicator of community condition
Identifying and characterizing dominant plants as an indicator of community condition
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DOI：
10.3394/0380-1330(2007)33
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发表时间：
2007-01-01
影响因子：
2.2
通讯作者：
Zedler, Joy B.
中科院分区：
文献类型：
--
作者：
Frieswyk, Christin B.;Johnston, Carol A.;Zedler, Joy B.
优势种对群落结构的形成起着关键作用，但其行为远不一致。我们推测，识别不同的行为（客观地确定）将是植物群落状况的指标。我们开发了一个物种优势指数（SDI），以确定优势物种，并在多个空间尺度上比较它们的行为。SDI是基于三个属性（平均覆盖，平均物种抑制，高覆盖的趋势），它确定了38个占主导地位的74个五大湖沿海湿地。在一个2x2x2矩阵中对每个属性进行二分，产生了七种主要行为或形式，所有这些行为或形式都发生在五大湖湿地。不同地点和不同聚集尺度的物种优势型不同。主要表现为“单型”的形式，入侵香蒲是最常见的样品中占主导地位的分类单元。通过定量测量优势和描述优势形式，SDI可以增加对群落变化的洞察力，是对群落状况指标的有益补充。
Dominant species play key roles in shaping community structure, but their behavior is far from uniform. We speculated that recognition of different behaviors (determined objectively) would be an indicator of the condition of plant communities. We developed a species dominance index (SDI) to identify dominant species and compare their behavior across multiple spatial scales. The SDI is based on three attributes (mean cover, mean species suppression, and tendency toward high cover), and it identifies up to 38 dominants within 74 Great Lakes coastal wetlands. Dichotomizing each of the attributes in a 2x2x2 matrix produced seven dominant behaviors, or forms, all of which occurred in Great Lakes wetlands. Species showed different dominant forms among locations and aggregation scales. Showing predominantly "monotype" form, invasive Typha was the taxon that was most often dominant in the samples. By quantitatively measuring dominance and describing dominance form, SDI can add insight into community change and is a useful addition to indicators of community condition.