利用中子水分仪测定棉田土壤水分含量

The Determination of Cotton Soil Moisture with Neutron Probe

研究利用中子仪对棉田土壤水分含量进行了测定。结果表明 :随着土壤深度的增加 ,土壤水分含量逐渐增加。在棉花生育期间 ,0～ 60cm土壤层次含水量变化大。其变异系数为 1 5 .88～ 74 .4 % ,含水量 (容积 % )为 3 .1 2～ 2 5 .3 6;60～ 1 2 0cm土壤层次含水量变化小。变异系数为 9.4 3～ 4 4.87% ,含水量 (容积 % )为 1 6.1 5～2 8.84 %。另外 ,两种土壤剖面类型土壤在保水上也存在着差异。结果也表明 :0～ 2 0cm土层的含水量明显低于 2 0～ 4

The measurement of cotton soil water content with neutron probe has been studied in this paper.The results show that the soil water content increases with the increase of soil depth .During the cotton growing period,the soil water content changes greatly in 0-60cm soil layer,and the coefficient of variability(cv%) is 15.88-74.48%,the water content (volume %) 3.12-25.36%. While in 60-120cm soil layer,the change is not obvious,and the cv% is 9.43-44.87% ,the water content (volume%) 16.15-28.84%.Also,there is some difference in water conservation between the two soil sections.The results also show that the water content (volume%) is lower in 0-20cm soil layer than that of in 20-40cm soil layer.