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首页> 外文期刊>International journal of soil science >Spatial Patterns of Penetration Resistance and Soil Moisture Distribution in a Sandy Loam Soil (Eutric leptosol)
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Spatial Patterns of Penetration Resistance and Soil Moisture Distribution in a Sandy Loam Soil (Eutric leptosol)

机译：沙质壤土（欧洲细小溶胶）的抗渗透性和土壤水分分布的空间格局

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Bivariate relations between penetration resistance and soil moisture content was conducted on sandy loam soil ( Eutric leptosol ) at the University of Juba demonstration farm. Soil Penetration Resistance (PR) was measured using an Eijkelkamp pocket penetrometer to a depth of 0?15 cm depth with Soil Moisture Content (SMC) measured using an Eijkelkamp sensor theta probe. Measured SMC within the plots varied from 9?35% whereas, the PR varied from 0.1 to 4.5 kg cm?2. The results showed significant negative correlation between PR and SMC expressed by a polynomial function with r2 = 0.48 and Pearson Coefficient, R = ?0.657. Spatial distribution of PR and SMC using both kriging and Inverse Distance Weighting (IDW) interpolation methods showed no significant differences. However, PR tended to decrease with an increasing SMC in an easterly direction. The results also showed that the spherical model gave the best fit for both PR and SMC at r2 = 0.527 and 0.747 with moderate and strong spatial dependency at 28.9 and 10.53%, respectively. Though the effective range A0, for both PR and SMC at 24.14 and 30.4 m, respectively were more or less similar, the strong spatial dependency of SMC suggested its significance as a limiting factor for plant growth as opposed to PR which on average was at 1.592 kg cm?2.
机译：在朱巴大学示范农场的沙质壤土（Eutric leptosol）上进行了抗渗透性与土壤水分含量之间的双变量关系。使用Eijkelkamp口袋式渗透仪测量0到15厘米深度的土壤渗透阻力（PR），使用Eijkelkamp传感器theta探针测量土壤湿度（SMC）。小区内测得的SMC变化范围为9？35％，而PR变化范围为0.1至4.5 kg cm ？2 。结果显示，PR和SMC之间的显着负相关由多项式函数表示，r 2 = 0.48，皮尔逊系数R = 0.657。使用克里金法和反距离权重（IDW）插值方法的PR和SMC的空间分布没有显着差异。但是，PR倾向于随着向东方向上SMC的增加而降低。结果还表明，球形模型最适合PR和SMC，r 2 = 0.527和0.747，中度和强空间依赖性分别为28.9％和10.53％。尽管PR和SMC在24.14和30.4 m处的有效范围A 0 或多或少都相似，但SMC对空间的强烈依赖性表明其作为植物生长的限制因素的重要性，相反至PR的平均值为1.592 kg cm ？2 。

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