breadth index
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Niche breadths of twenty dominant species were analyzed using Shannon-Wiener niche breadth index, and the dominant species were classified into four ecological groups.
采用Shannon-Wiener生态位宽度指数和Petraitis生态位重叠指数测定了滹沱河流域湿地植被20个优势种群的生态位宽度和生态位重叠。
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Using the Shannon-Wiener's niche breadth index and the Pianka's niche overlaps index, we found that the Nereis japonica, nemerteans and eelworms had broad niche breadths (above 2.80); the niche overlaps among them was high (above 0.90) in the quantitative analysis on the 21 species present in the quantitative sample analysis.
对定量取样中获得的21个物种以Shannon-Wiener指数为基础进行了生态位宽度测定，以Pianka重叠指数为基础进行了生态位重叠值分析，结果表明日本沙蚕、纽虫和线虫的生态位较宽，均为2.80以上，它们之间的生态重叠值也较高，均为0.90以上。
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Result The temporal and spatial niche breadth index of mango anthracnose in control area were 0.1785 and 0.9656, resp., that in conventional area were 0.1754 and 0.7966, resp., and that in prediction area were 0.1762 and 0.8267, resp.
结果］对照区芒果炭疽病时间和空间生态位宽度指数分别为0.1785、0.9656；常规区芒果炭疽病的时间和空间生态位宽度指数为0.1754和0.7966；预测区芒果炭疽病的时间和空间生态位宽度指数为0.1762和0.8267。
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By using Shannon-Wiener index of niche breadth and Pianka index of niche overlap, this paper studied the niche characteristics of main plant species at different succession stages of vegetation in desert areas of north Gulang County, Gansu Province.
利用Shannon—Wiener生态位宽度公式和Pianka生态位重叠公式，计测分析了甘肃省古浪县北部荒漠植被主要植物种在不同植被演替阶段的生态位宽度和生态位重叠。
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Based on the investigation of the growth status of gardens plants with the same site conditions, the important values of populations were calculated with the software of ArcMap, the niche breadth of populations were studied using the Shannon-weinne diversity index, Levins niche breadth index and niche overlap.
通过对立地条件类型相同城市的园林绿地植物生长状况进行调查，运用ArcMap软件计算各种群的重要值；采用Shannon-weinne多样性指标、Levins生态位宽度指数和1994年黄英姿提出的生态位重叠计算公式进行种群生态位宽度的研究，将种群生态位理论运用于生态园林建设中。
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breadth index：宽度指数
BREAD AND BUTTER BUSINESS 基本业务 | BREADTH INDEX 宽度指数 | BREAK-EVEN 不亏不盈,收支相抵.
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the breadth thrust index：abbr. bti; 广量冲力指标