ESTIMATING GENERALIZED SOIL-WATER CHARACTERISTICS FROM TEXTURE
ESTIMATING GENERALIZED SOIL-WATER CHARACTERISTICS FROM TEXTURE
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DOI：
10.2136/sssaj1986.03615995005000040039x
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发表时间：
1986-07-01
影响因子：
2.9
通讯作者：
PAPENDICK, RI
中科院分区：
文献类型：
--
作者：
SAXTON, KE;RAWLS, WJ;PAPENDICK, RI
土壤水势和导水率与土壤含水量的关系是许多植物和土壤水分研究所需要的。这些关系的测量是昂贵的，困难的，往往是不切实际的。对许多目的而言，根据更容易获得的信息，如土壤质地，进行一般性估计就足够了。最近的研究已经开发了土壤质地和选定的土壤电位之间的统计相关性，使用一个大的数据库，也选定的土壤质地和水力传导率之间。本研究的目的是扩展这些结果，通过提供数学方程的连续估计在广泛的土壤质地，水势，和水力传导率。从最近的统计分析的结果被用来计算水势为广泛的土壤质地，然后这些都是适合的多元分析，以提供连续的潜在估计所有包容性的纹理。同样地，针对所有包容性结构的非饱和水力传导率，也建立了相应的方程。虽然开发的方程只代表一个统计估计，只有纹理的影响，他们提供了非常有用的估计，为许多常见的土壤-水的情况。该方程提供了良好的计算效率模型的应用和纹理可用作校准参数，现场或实验室土壤水分特征数据。预测值成功地与几个独立的测量土壤水势。
Soil-water potential and hydraulic conductivity relationships with soil-water content are needed for many plant and soil-water studies. Measurement of these relationships is costly, difficult, and often impractical. For many purposes, general estimates based on more readily available information such as soil texture are sufficient. Recent studies have developed statistical correlations between soil texture and selected soil potentials using a large data base, and also between selected soil textures and hydraulic conductivity. The objective of this study was to extend these results by providing mathematical equations for continuous estimates over broad ranges of soil texture, water potentials, and hydraulic conductivities. Results from the recent statistical analyses were used to calculate water potentials for a wide range of soil textures, then these were fit by multivariate analyses to provide continuous potential estimates for all inclusive textures. Similarly, equations were developed for unsaturated hydraulic conductivities for all inclusive textures. While the developed equations only represent a statistical estimate and only the textural influence, they provide quite useful estimates for many usual soil-water cases. The equations provide excellent computational efficiency for model applications and the textures can be used as calibration parameters where field or laboratory soil water characteristic data are available. Predicted values were successfully compared with several independent measurements of soil-water potential.