PAM保水剂及纳米蒙脱土对果园生草地上部生物量的影响

Effect of PAM aquasorbent and nano-montmorillonite on the aboveground biomass of planting herbage in orchard

为了实现果园生草节水效果,采用田间试验方法,研究了半量和常规灌溉条件下,不同用量的PAM保水剂(0,4,8,12 g/m2)和不同用量纳米蒙脱土(0,150,300,450 g/m2)对不同草(紫花苜蓿,黑麦草,白三叶)地上部总生物量的影响。结果表明,半量灌溉条件下,施用PAM保水剂可显著增加3种草的地上部总生物量,适宜剂量为8 g/m2,而常规灌溉条件下,不宜施用PAM保水剂。施用纳米蒙脱土可增加3种草的地上部总生物量,半量灌溉条件下,适宜剂量为150 g/m2,常规灌溉条件下,对于紫花苜蓿和黑麦草,适宜剂量为450 g/m2,对于白三叶,适宜剂量为300 g/m2。

With the water-saving purpose of orchard grass, a field experiment was conducted to study the effect of different amount of PAM aquasorbent （0, 4, 8 g/m2 and 12 g/m2） and different amount of nano-montmorillonite（0, 150, 300 g/m2 and 450 g/m2） on the aboveground biomass of different kinds of grass （Alfalfa, Ryegrass, White Clover）. The results indicate that under 50 % usual irrigation quantity condition, the use of PAM aquasorbent can significantly increase the total aboveground biomass of the three kind of grasses and the suitable amount is 8 g/m2, while under the usual irrigation quantity condition, PAM aquasorbent should not be applied. The nano-montmorillonite is good for the increase of the total aboveground biomass, when the irrigation quantity was 50 % of the usual irrigation quantity. The appropriate amount for the three kinds of grass is 150 g/m2, under the usual irrigation quantity, different kinds of grass need different amount, and 300 g/m2 is appropriate for White Clover, as for Alfalfa and Ryegrass, the amount of 450 g/m2 is suitable.