论文部分内容阅读
一、土壤水分常数在一定条件下,土壤保持水分的数值为土壤水分常数,它是表明土壤水分特征的。从不同厚度的水膜分子吸力图。可以看出不同水分常数的能量水平。不同厚度的水膜分子吸力图1.最大持水量:土壤所有孔隙均被水所充满时的饱和含水量,此时的土壤水分吸力为零。2.田间持水量:在排水良好情况下,大量灌水或降雨,覆盖1～2天后的土壤含水量,以前以1/10巴(砂土)1至1/3已(粘土)作为大致标准,现在国际上趋向于0.06巴,即土壤水分吸力为60厘米
First, the soil moisture constant Under certain conditions, the value of soil water retention for the soil moisture constant, which is indicative of soil moisture characteristics. From different thickness of the water film molecule suction map. The energy levels of different moisture constants can be seen. Figure 1. Maximum water holding capacity: saturated water content when all the pores in the soil are filled with water. At this moment, the soil water suction is zero. 2. Field water holding capacity: In the case of good drainage, a large number of irrigation or rainfall, covering 1 to 2 days after the soil moisture content, before the 1/10 bar (sand) 1 to 1/3 of the (clay) as a rough standard, Nowadays the international trend is 0.06 bar, that is, the soil moisture suction is 60 cm