Effect of daily soil temperature fluctuations on soil electrical conductivity as measured with the Geonics® EM-38

被引：35

作者：

Brevik E.C. ^{[1
]}

Fenton T.E. ^{[2
]}

Horton R. ^{[3
]}

机构：

[1] Dept. of Phys., Astron., and Geosci., Valdosta State University, Valdosta

[2] Soil Survey, Iowa State University, Ames

[3] Agronomy Department, Iowa State University, Ames

来源：

Precision Agriculture | 2004年 / 5卷 / 2期

关键词：

Diurnal temperature fluctuations; Electrical conductivity; EM-38;

D O I：

10.1023/B:PRAG.0000022359.79184.92

中图分类号：

学科分类号：

摘要：

Soil electrical conductivity (ECa) measured by electromagnetic induction (EM) using the EM-38 has shown promise as a soil survey tool. Soil temperature influences ECa readings, and temperature can fluctuate considerably in the upper 10 cm of the soil during a day. ECa readings were taken in the horizontal and vertical dipole orientations once an hour from 8 a.m. to 8 p.m. at four sites on three separate days to determine if ECa values were influenced by diurnal temperature variations. Soil temperature readings were taken at the same times at four depths. EM-38 readings remained steady at all four sites all 3 days. Linear regression analysis when temperature in the upper 10 cm was plotted against ECa yielded low r2 values and slopes, indicating no correlation between soil temperature in the upper 10 cm and ECa values. Diurnal changes in soil temperature do not significantly influence soil ECa readings obtained with the EM-38 under the conditions encountered during the study.

引用

页码：145 / 152

页数：7

共 24 条

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