【摘要】 对中子仪测量土壤水分的合理计数时间、测量次数、曲线标定方法进行了探讨。结果表明 ,在华北京郊农田土壤条件下 ,一般大田 16 s的计数时间 1次即可 ,对刚浇过水湿度较大的耕地表层以 32 s较好。为保证精度 ,0～ 10 0 cm耕层范围内宜采用“3段式”标定法。即 0～ 5 cm用直线标定 ,5～ 30 cm用三阶多项式标定 ,30～ 10 0 cm用直线标定。通过土壤水分的变异性可以预测下年的最少田间布管数更多还原

【Abstract】 It was discussed of the reasonable collection data time, measuring times and the curve calibration method with measuring soil moisture by neutron probe. It is enough for the 16 seconds counting time in the Beijing suburbs farmland usually, but it is better for 32 seconds when the soil water content is saturated. The calibration should be divided into different layers, the calibration curves of 0～5 cm and 30～100 cm were line correlation, that of 5～30 cm was the multinomial. The least cubes for next year could be forecasted by soil water space variability.更多还原