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首页> 外文期刊>International journal of soil science >Homomorphic Modelling of Shrinkage Properties of Soils of Southeastern Nigeria for Sustainable Land Use
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Homomorphic Modelling of Shrinkage Properties of Soils of Southeastern Nigeria for Sustainable Land Use

机译：尼日利亚东南部土地可持续利用的土地收缩特性的同态建模

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Responsiveness of soils to volume change at all moisture statuses affect infrastructural development of soils. Volume Shrinkage (VS) was estimated from Coefficient of Linear Extensibility (COLE) values, using 150 soil samples from 30 soil profile pits in southeastern Nigeria. The objective of this study was to use soil properties related to shrinkage in predicting and monitoring volume changes in these soils in southeastern region of Nigeria. The value of liquid limit (26-30%) was higher than that of plastic limit (11-13%). Plasticity index was lower (16-17%) in the upper soil layer (0-40 cm) than in the lower horizons (41-80 cm layer) by 24%. Volume shrinkage value (11.20-11.80%) was least at the topmost horizon (0-40 cm depth) and increased to between 14-18% in the lower part of the profile (40-100 cm). Soils at all depths showed low to moderate shrink-swell properties having coefficient of linear extensibility of 0.036-0.057 cm cm-1 with middle layers showing higher shrink-swell characteristics. These results show moderate shrinkage (VS = 10-20) although intra-pedal variability was prominent. Multiple regression analysis showed good predictive ability (R2 = 0.76): p = l.05; n = 150) of Atterberg?s limits, texture, bulk density and organic matter (OM) in determining shrinkage properties. Accuracy of prediction was defined by a low Root Mean Square Error (RMSE) value of 0.01 while the model overestimated slightly (bias±0.00001).
机译：在所有湿度条件下，土壤对体积变化的响应能力都会影响土壤的基础设施发展。根据线性膨胀系数（COLE）值，使用尼日利亚东南部30个土壤剖面坑中的150个土壤样品，估算了体积收缩率（VS）。这项研究的目的是利用与收缩有关的土​​壤特性来预测和监测尼日利亚东南部地区这些土壤的体积变化。液体极限值（26-30％）高于塑料极限值（11-13％）。上部土壤层（0-40厘米）的可塑性指数比下部层（41-80厘米层）的可塑性指数低（16-17％）24％。体积收缩值（11.20-11.80％）在最上层水平（0-40厘米深度）处最小，在剖面下部（40-100厘米）处增加至14-18％之间。所有深度的土壤都表现出低至中等的收缩膨胀特性，其线性延伸系数为0.036-0.057 cm cm -1 ，中间层具有较高的收缩膨胀特性。这些结果显示出适度的收缩（VS = 10-20），尽管脚内变异性很明显。多元回归分析显示出良好的预测能力（R 2 = 0.76）：p = 1.05; n = 150）在确定收缩性能时的极限，织构，堆积密度和有机质（OM）。预测的准确性由0.01的低均方根误差（RMSE）值定义，而模型略微高估了（bias±0.00001）。

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