秸秆-膨润土-PAM改良材料对沙质土壤田间持水量的影响

Effect of Straw-Bentonite-PAM-Improved Materials on Field Capacity of a Sandy Soil

通过室内土培试验,研究由作物秸秆、膨润土和聚丙烯酰胺(PAM)配制的改良材料对沙质土壤田间持水量的影响.结果表明,施用秸秆改良材料能提高土壤田间持水量,且随改良材料施用剂量(<10g/kg)及PAM质量分数(<2%)的增加而增大.随土培时间的延长,土壤田间持水量出现了先增大后减小的趋势,在土培60d时达最大值.3种秸秆改良材料中,麦秆改良材料的改良效果最好,田间持水量达到了37.90%,为对照的2.81倍,对沙质土壤的改良效果最显著.

Indoor soil culture was carried out to identify the influence of straw-improved materials on the field capacity of a sandy yellow soil in Chongqing. Air-dried maize, wheat or rice straw was ground and made into compost, which was then mixed with bentonite and PAM with a ratio of 90 ： 10 ： 0, 90 ： 10 ： 1, 90： 10 ： 2 or 90：10 ： 3 and applied to the soil at 2, 5 or 10 g/kg soil. Soil samples were taken after 10, 30, 60 and 90 days＇ culture and their field capacity was determined. The results showed that the field capacity of the sandy soil increased with straw improved-material application. The field capacity of the sandy soil increased gradually with the increasing dosage of the straw improved materials （〈10 g/kg） and the mass fraction of PAM （〈2%）. The field capacity of the sandy soil first increased and then decreased with culture time and reached the maximum on the 60th day. Of the three materials studied, the wheat straw-improved material worked best, and its ameliorative effect on the sandy soil was the most significant, with a field capacity of 37.90%, being 2.81 times that of the control.