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Effect of Quadrat and Core Sizes onDetermining the Spatial Pattern ofCriconemella sphaerocephalus

机译:Quadrat和磁芯尺寸对确定空间格局球形头孢杆菌

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摘要

An unmanaged pasture was sampled on four occasions (A, B, C, D) with five different quadrat sizes for Criconemella sphaerocephalus by removing a constant soil core volume of 75 cm³ (A) and 300 cm³ (C) from increasing quadrat areas of 0.5-8 m², and removing soil core volumes of increasing size - 75-1,200 cm³ (B) and 300-4,800 cm³ (D) - proportionally with an increase in quadrat area (0.5-8 m²). Frequency counts of C. sphaerocephalus were fitted to six probability distributions. The index of aggregation (b) for Taylor's power law and Morisita's index of dispersion were also calculated where appropriate. Twelve of nineteen of the sampling combinations were best described by negative binomial distribution (P = 0.05). Criconemella sphaerocephalus appeared more highly aggregated when sampled with constant soil core volumes (A and C) than from increasing soil core volumes (B and D) based on Taylor's index of aggregation (b). Morisita's index of dispersion indicated aggregation at the smallest quadrat area (0.5 m²) for all sampling occasions (A, B, C, D).
机译:通过从不断增加的0.5平方面积中去除75cm³(A)和300cm³(C)的恒定土壤核心体积,在四种情况下(A,B,C,D)对五种不同大小的球形头孢菌进行了无管理的牧场采样-8平方米,并移除尺寸增大的土壤核心体积-75-1,200cm³(B)和300-4,800cm³(D)-与方形面积(0.5-8m²)的增加成比例。球形头孢菌的频率计数被拟合为六个概率分布。在适当的情况下,还计算了泰勒幂律的聚集指数(b)和森立塔的分散指数。负二项分布最好地描述了十二个采样组合中的十二个(P = 0.05)。根据恒定的土壤核心体积(A和C)进行采样时,球形隐球菌的聚集度要比基于泰勒聚集指数的增加的土壤核心体积(B和D)高(b)。莫里西塔的分散指数表明,在所有采样情况下(A,B,C,D),聚集在最小的正方形区域(0.5m²)。

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