Predicting Penetrometer Resistance from the Compression Characteristic of Soil
Predicting Penetrometer Resistance from the Compression Characteristic of Soil
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DOI：
10.2136/sssaj2011.0217
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发表时间：
2012-03-01
影响因子：
2.9
通讯作者：
Whalley, W. R.
中科院分区：
文献类型：
--
作者：
Gao, W.;Ren, T.;Whalley, W. R.
土壤紧实是影响作物根系生长的严重问题。贯入阻力通常被用作土壤对根伸长的阻力的指标。我们开发了一个简单的函数来估计土壤压缩特性的电阻率计电阻。在这项工作中使用了五种不同质地和有机质含量的土壤。风干土样在张力台上饱和，然后排水至不低于-30 kPa的不同基质势。在单轴压缩装置中压实平衡的土壤，以提供30至1000 kPa范围内的预压应力。然后用直径为2 mm的60度锥形电阻率计测量土壤的电阻率计电阻。土壤压缩特性随土壤质地、有机质含量和初始含水量的变化而变化。贯入阻力值随着孔隙比的减小而增加，可以用预压应力和压缩特性的斜率来解释，使用一个简单的方程，参数与土壤类型无关。我们的方程解释了84%的电阻率计电阻的方差。
Soil compaction is a serious issue that affects the growth of crop roots. Penetrometer resistance is often used as an indicator of the resistance of soil to root elongation. We developed a simple function to estimate penetrometer resistance from the soil compression characteristic. Five soils with contrasting textures and organic matter contents were used in this work. Air-dry soil samples were saturated on a tension table and then drained to different matric potentials not less than -30 kPa. The equilibrated soils were compacted in a uniaxial compression device to give precompression stresses in the range of 30 to 1000 kPa. The penetrometer resistance of the soils was then measured with a 2-mm-diameter 60 degrees cone penetrometer. Soil compression characteristics varied with soil texture, organic matter content, and initial soil water content. Penetrometer resistance values increased with decreasing void ratio and could be explained by the precompression stress and the slope of the compression characteristic, using a simple equation with parameters independent of soil type. Our equation explained 84% of the variance in penetrometer resistance.