The effect of quadrat size, plant size, and plant distribution on frequency estimates in plant ecology
The effect of quadrat size, plant size, and plant distribution on frequency estimates in plant ecology
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植物生态学中样方大小、植物大小和植物分布对频率估计的影响
DOI：
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发表时间：
1958
期刊：
影响因子：
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通讯作者：
J. Aberdeen
中科院分区：
文献类型：
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作者：
J. Aberdeen
讨论了频率估计在植物生态学中应用的理论基础。推导了缺失值与样方大小、植物单元大小、植物密度和植物单元聚集度之间的关系式。图解方法被用来估计随机分布的物种个体的密度和平均大小。偏离随机分布也可以用这些方法来检测。结果表明，如果将平均机组规模的估计与频率估计相结合，则结果的可靠性大大提高。讨论了用一个、两个或更多大小的样本进行频率估计的价值。
The theoretical foundation for frequency estimates, as used in plant ecology, is discussed. An equation is derived in which the absence value is linked with the quadrat size, the plant unit size, the plant density, and the aggregation of the plant units. Graphical methods are used to estimate the density and the average size of the individuals of a species for a random distribution. Departure from a random distribution can also be detected by these methods. It is shown that if an estimate of the average plant unit size is combined with the frequency estimates, then the reliability of the results is increased considerably. The value of frequency estimates made with one, two, or more sizes of quadrats is discussed.