豫东平原地区田间持水量测定及误差分析

Measurement and Error Analysis of Field Water Capacity in Eastern Henan Plain

田间持水量是土壤墒情分析和干旱评估的重要指标。土壤相对湿度的确定,即干旱程度评估,田间持水量的测定是首要必须完成的工作,测定精度直接影响旱情评估的准确性,而田间持水量的测定方法有多种,测定结果均存在一定误差,文章采用自然降水法、实验室环刀、移动墒情仪法及电导率法测得的数据进行对比分析,进而提出合理监测方案,确保田间持水量符合当地实际,准确计算灌溉定额,更好地指导农业生产。

Field water capacity is an important index for soil moisture analysis and drought assessment.The determination of soil relative humidity,which assesses the degree of drought,and the determination of field water capacity are the primary tasks that must be completed.The accuracy of the determination directly affects the accuracy of drought assessment.However,there are many methods for the determination of field water capacity,and the results all have definite errors.In this paper,the data measured by natural precipitation method,laboratory circular knife,mobile moisture meter and electrical conductivity method are compared and analyzed,and then a reasonable monitoring scheme is put forward to ensure that the field water capacity is in line with the local reality.The irrigation quota is calculated accurately,so as to guide agricultural production better.