在土壤逐渐干旱过程中,低营养水平的春小麦叶片比高营养水平的一直保持较高的水势和相对含水量,表明营养水平提高后,植株对干旱更敏感。干旱条件下,无机营养没有使春小麦的最大渗透调节明显增强,只改变了渗透调节的变化进程;在中度至近严重干旱时,高营养水平春小麦叶片表现出较强的渗透调节。在春小麦叶片中,参予渗透调节的主要溶质之一是可溶性糖,其中还原糖占较大的比例。 During the gradual soil drought, the spring wheat leaves at low trophic levels maintained higher water potential and relative water content than high trophic levels, indicating that plants are more susceptible to drought after the nutrition level is increased. Under drought conditions, inorganic nutrition did not significantly increase the maximum osmotic adjustment of spring wheat, which only changed the process of osmotic adjustment. During medium to near severe drought, the leaves of high nutritional level spring wheat showed strong osmotic adjustment. Among spring wheat leaves, one of the major solutes involved in osmotic adjustment is soluble sugar, of which reducing sugars account for a large proportion.