PRECISION OF NEUTRON-SCATTERING AND CAPACITANCE TYPE SOIL-WATER CONTENT GAUGES FROM FIELD CALIBRATION
PRECISION OF NEUTRON-SCATTERING AND CAPACITANCE TYPE SOIL-WATER CONTENT GAUGES FROM FIELD CALIBRATION
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DOI：
10.2136/sssaj1995.03615995005900040001x
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发表时间：
1995-07-01
影响因子：
2.9
通讯作者：
STEINER, JL
中科院分区：
文献类型：
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作者：
EVETT, SR;STEINER, JL
基于中子散射（NS）的土壤含水量仪已经成为土壤水分调查的一个有价值的工具，约40年。然而，许可证，培训和安全法规有关的放射源在这些仪表使他们的使用昂贵，并阻止使用在某些情况下，如无人值守的监测。电容探针（CP）压力计的特性似乎使其成为NS压力计的理想替代品。我们在现场校准练习中确定了两种品牌的NS规（各三个规）和一种品牌的CP规（四个规）的相对精度。两种品牌的NS测量仪均根据土壤体积含水量进行校准，确定系数（r（2））范围为0.97至0.99，均方根误差（RMSE）
Soil water content gauges based on neutron scattering (NS) have been a valuable tool for soil water investigations for some 40 yr. However, licensing, training, and safety regulations pertaining to the radioactive source in these gauges makes their use expensive and prevents use In some situations such as unattended monitoring. A capacitance probe (CP) gauge has characteristics that would seem to make it an ideal replacement for NS gauges. We determined the relative precision of two brands of NS gauges (three gauges of each) and a brand of CP gauge (four gauges) in a field calibration exercise. Both brands of NS gauges were calibrated vs. volumetric soil water content with coefficients of determination (r(2)) ranging from 0.97 to 0.99 and root mean squared errors (RMSE)