BALANCED ENTROPY INDEX TO CHARACTERIZE SOIL TEXTURE FOR SOIL WATER RETENTION ESTIMATION

BALANCED ENTROPY INDEX TO CHARACTERIZE SOIL TEXTURE FOR SOIL WATER RETENTION ESTIMATION
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平衡熵指数表征土壤质地以估算土壤持水量

DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
W. Rawls
W. Rawls
中科院分区：
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文献类型：
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作者：
M. Martín;Y. Pachepsky;J. Rey;J. Taguas;W. Rawls

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大多数有关污染物迁移和归宿的项目都需要土壤水力参数。 Pedotransfer 程序通常用于根据土壤调查提供的基本土壤数据来估计土壤水力特性。已知土壤粒度分布或质地是影响土壤保留和传输水和溶质能力的主要土壤特性。人们在寻找可用于估计土壤水力特性的纹理参数方面付出了巨大的努力。最近提出了一种新的基于熵的指数来表征粒度分布的不均匀性。这个称为平衡熵的指数有可能反映土壤颗粒的可能堆积。我们的目标是看看平衡熵是否可以与其他基本土壤特性一起作为土壤保水量的变量预测因子之一。我们计算了 NRCS 土壤特征数据库中 9871 个土壤样本的平衡熵，并应用数据挖掘工具根据土壤质地组成、有机碳含量和堆积密度来估计保水量。平衡熵是−33 kPa 体积含水量的最佳单一预测因子​​和最重要的预测因子，而众所周知，体积含水量很难估计。使用平衡熵是提高土壤水力特性估计准确性的一种有前途的方法。
Soil hydraulic parameters are needed in most projects on transport and fate of pollutants. Pedotransfer procedures are often used to estimate soil hydraulic properties from basic soil data available from soil surveys. Soil particle size distribution, or texture, is known to be a leading soil property affecting soil ability to retain and transmit water and solutes. A substantial effort has been put in searching for texture parameters useful for estimating soil hydraulic properties. Recently a new, entropy-based index has been proposed that characterizes the non-evenness of particle size distributions. This index called balanced entropy has a potential to reflect probable packing of soil particles. Our objective was to see whether the balanced entropy can serve along with other basic soil properties as one of variables-predictors of soil water retention. We computed the balanced entropy for 9871 soil samples in the NRCS soil characterization database and applied the data mining tools to estimate water retention from soil textural composition, organic carbon content, and bulk density. The balanced entropy was the best single predictor and the most important predictor of volumetric water contents at −33 kPa, which are notoriously difficult to estimate. Using the balanced entropy is a promising approach to improve the accuracy of estimated soil hydraulic properties.