本文通过模拟干旱背景研究了短芒披碱草和老芒麦内自由脯氨酸、叶气孔对干旱胁迫的反应和差异。结果表明:短芒披碱草脯氨酸积累速度慢于老芒麦,但气孔相应关闭早于老芒麦,且关闭过程明显的长于老芒麦。脯氨酸积累进程有两个明显的积累临界值:即脯氨酸积累初始临界值和脯氨酸积累显著临界值,这两个值与气孔运动过程同步。据此证明:两种禾草间脯氨酸积累速度、数量决定于叶气孔对干旱胁迫的调控适应性。 In this paper, the responses and differences of free proline and leaf stomata to drought stress in Elymus dahuricus and Eriobotrya japonica were studied by simulating arid background. The results showed that the accumulation of proline in Elymus dahurica was slower than that of Erigeron barley, but the stomatal closure was earlier than that of Erigeron barley, and the closing process was obviously longer than that of Erigeron. There are two obvious accumulation thresholds for proline accumulation: the initial critical value of proline accumulation and the critical value of proline accumulation, which are in synchrony with the stomatal movement. Proved: The accumulation rate of Proline between the two grasses depends on the regulation of leaf stomatal regulation.