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Spatial Variability of Soil Physical Properties Affecting Florida Citrus Production

机译：土壤物理性质的空间变异性影响佛罗里达州柑橘的生产

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Spatial variability of citrus yield is very common in Florida, but very little has been done to identify the responsible soil factors. Our objective was to characterize variations in soil physical properties in sandy soils where citrus is produced in Florida. A citrus grove was divided into five productivity zones defined as "very poor," "poor," "medium," "good," and "very good" based on tree canopy volume. Six random soil samples were collected from each zone at depths of 0 to 15, 15 to 30, 30 to 45, and 45 to 60 cm. Samples were analyzed for soil color, particle size and sand size distribution, and water retention parameters. Although the coefficients of variation (1%-60%) were large for color, texture, and water retention, the values were generally higher in areas with large trees and vice versa. The trend was opposite for soil lightness and sand content, which were lower in areas of greater growth. Most of the soil properties had a large spatial variation with semivariogram range of 100 to 250 m and varied greatly with increased productivity. Differences between the productivity zones were even more prominent at greater soil depth. Characterization and quantification of spatial soil variability in citrus groves would assist in planning future soil sampling in new fields showing soil and/or tree growth variability. The selection of soil sampling sites should be based on the sampling interval suggested by the variogram range (<75 m) and include the depth (45-60 cm) influencing productivity.
机译：柑橘产量的空间变异性在佛罗里达州非常普遍，但很少能确定引起土壤污染的因素。我们的目的是表征佛罗里达州生产柑橘的沙质土壤的土壤物理特性变化。根据树冠的数量，将柑橘林划分为五个生产力区域，分别定义为“非常差”，“差”，“中等”，“好”和“非常好”。从每个区域的0至15、15至30、30至45和45至60 cm的深度收集了六个随机土壤样品。分析样品的土壤颜色，粒度和沙粒分布以及保水参数。尽管颜色，纹理和保水率的变异系数（1％-60％）大，但树木较大的地区通常较高，反之亦然。土壤轻度和含沙量的趋势相反，生长量较大的地区则较低。大多数土壤特性的空间变化很大，半变异函数范围为100至250 m，并且随着生产率的提高而变化很大。在更大的土壤深度下，生产力区之间的差异更加明显。柑橘林中土壤空间变异性的表征和量化将有助于规划显示土壤和/或树木生长变异性的新田地的未来土壤采样。土壤采样点的选择应基于方差图范围（<75 m）建议的采样间隔，并包括影响生产率的深度（45-60 cm）。

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