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首页> 外文期刊>Soil Science Society of America Journal >Lysimetry versus Neutron Moisture Meter for Evapotranspiration Determination in Four Soils
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Lysimetry versus Neutron Moisture Meter for Evapotranspiration Determination in Four Soils

机译：溶速与中子水分仪测定四种土壤的蒸散量

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Knowledge of evapotranspiration (ET) is vital for the management of our freshwater resources. One method for determining ET is through the measurement of the soil water balance, where ET is the residual calculated from the change in soil water storage plus precipitation and irrigation and minus drainage and runoff. The objective of this research was to compare the ET calculations where the change in soil water storage was measured using the neutron moisture meter (NMM), or ET sub(NMM), vs. using weighing lysimeters (ET sub(LYS)) in four soils. Cotton (Gossypium hirsutum L.) was grown in 2006 and 2007 in weighing lysimeters with NMM access tubes and drainage systems. The soil textures ranged from fine sand to clay loam. The ET sub(NMM) was <4% of the ET sub(LYS) for the clay loam and sandy loam soils, but ET sub(NMM) was 8% less than ET sub(LYS) in the fine sand due to errors created by the timing of drainage and NMM measurements. At ET sub(LYS) amounts <50 mm, the difference between ET sub(LYS) and ET sub(NMM) for individual measurement intervals could be as much as 28 mm and the average ET sub(NMM)/ET sub(LYS) ratios as much as 1.20. Beyond 100 mm of ET sub(LYS), the average ET sub(NMM)/ET sub(LYS) ratios became near 1.0 except for the fine sand, where unmeasured drainage out of the NMM sensor zone resulted in an underestimation of ET. When all other soil water balance components were quantified, a field-calibrated NMM accurately determined the change in soil water storage for the calculation of ET in three of the four soils.
机译：蒸散（ET）的知识对于我们淡水资源的管理至关重要。确定ET的一种方法是测量土壤水平衡，其中ET是根据土壤蓄水量加上降水和灌溉量以及减去排水和径流量的变化计算出的残差。这项研究的目的是比较ET的计算方法，其中使用中子水分计（NMM）或ET sub（NMM）来测量土壤储水量的变化，与使用称重溶度计（ET sub（LYS））来进行测量土壤。棉花（Gossypium hirsutum L.）于2006年和2007年在带有NMM接入管和排水系统的称重渗漏计中生长。土壤质地从细砂到粘土壤土不等。粘土壤土和沙质壤土的ET sub（NMM）小于ET sub（LYS）的4％，但由于产生的误差，细砂中的ET sub（NMM）比ET sub（LYS）低8％通过排水和NMM测量的时间。当ET sub（LYS）的量小于50 mm时，单个测量间隔的ET sub（LYS）和ET sub（NMM）之差可能高达28 mm，平均ET sub（NMM）/ ET sub（LYS）比率高达1.20。在ET sub（LYS）超过100 mm时，除细砂外，平均ET sub（NMM）/ ET sub（LYS）的平均比值接近1.0，在那里，未经测量的NMM传感器区域的排水量导致ET的低估。对所有其他土壤水分平衡成分进行定量分析后，经过现场校准的NMM可以准确确定土壤蓄水量的变化，以计算四种土壤中三种土壤的ET。

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