污水灌溉对小麦生物学性状的影响

Effect of Sewage Irrigation on Biological Characteristics of Wheat

试验用不同浓度的临汾市污水浇灌旱地晋麦79号和水地临优2069号2个小麦品种,通过盆栽试验,研究在不同浓度污水处理下,小麦幼苗早期生长发育及部分生理指标的变化,结果表明:低浓度污水浇灌的小麦幼苗株高、根长、根数上比对照增加,鲜重和干重高于对照,而高浓度污水则相反。随着污水浓度的增大,小麦叶片内MDA含量不断升高,SOD活性逐渐降低。旱地晋麦79号的POD活性表现为随污水浓度的增大而降低,水地临优2069号的POD活性呈先上升后下降的趋势,不同品种小麦表现出不同的抗性。低浓度污水浇灌的小麦,其叶片内游离的脯氨酸含量升高,但随污水浓度的增大又迅速降低。处理1、处理2的2个小麦品种在各项指标中表现出一定的优势,因此,适合临汾市的清污混灌比例应为1:1和1:2。

In this pot experiment, different concentrations of sewage from Linfen city was used to irrigate two wheat varieties growing in dry land or water land, and the effects of different sewage irrigation treatments on the early - stage growth and some physi- ological indexes of wheat seedlings were studied. The results indicated that wheat seedlings irrigated by low concentration of sewage had a higher value in plant height, root length, root number, fresh weight and dry weight than the control samples; on the contrary, wheat seedlings treated with high concentration of sewage had a lower value in above indexes than the control. As the concentration of sewage increased, the MDA content in wheat leaves increased, but the SOD activity decreased gradually. The POD activity of Jin- mai No. 79 in dry land decreased when the sewage concentration increased. The POD activity of Linyou No. 2069 in water land in- creased first and then decreased when the concentration of sewage increased, namely these two wheat varieties showed different re- sistances to sewage. The wheat samples irrigated by low concentration of sewage contained more free proline in their leaves, but the free proline content rapidly decreased with the increase in sewage concentration. Two wheat varieties in treatment 1 and treatment 2 showed certain advantages in each index. Therefore, the proper ratio of fresh water to sewage used to irrigate wheat in Linfen city should be between 1 ： 1 and 1 ： 2.