DZN3型土壤水分自动站测墒质量分析

Quality Analysis of Soil Moisture Monitoring at DZN3 Automatic Station

对2011年3—7月28次DZN3型土壤水分自动站与人工土壤相对湿度观测资料进行质量对比分析,结果显示:自动站观测数据与人工观测数据相比普遍偏小,30cm土层数据偏差最小,20、40、50cm土层次之,10、60、80、100cm土层偏差较大;10、20、80、100cm 4个土层自动站相对湿度演变趋势与人工测值较为接近,相关性较好;自动站土壤水分传感器对土壤水分变化敏感程度较低,其相同土层土壤相对湿度波动振幅小。分析结果可为评估DZN3型土壤水分自动站的监测能力及监测数据订正与应用服务提供客观依据。

The 28 soil relative humidity measurements from March to July 2011 from DZN3 automatic soil moisture observation stations and manual observation are compared and analyzed. The results indicate that measurements from the automatic station are generally smaller than those from manual observation; the difference in the 30 cm soil layer is the smaller, those of the 20, 40, 50 cm layers the next, and those of 10, 60, 80, 100 cm soil layers the greater; the variation tendency is close in 10, 20, 80, 100 cm soil layers, and their correlation is good; the sensor sensitivity of automatic observation is relatively low for soil moisture changes, and the fluctuation range of soil relative humidity is small in the same soil layer. The results can provide an objective basis for evaluating the monitoring capability and revising and applying the monitoring data from the DZN3 automatic Soil moisture observation station.