Abstract: The work had been made to measure the water content and water saturation deficit as well as water saturation deficit of sublethal of plants at different phenophase in alpine Kobresia humilis meadow during growing season from May to September in 1986.The results have been analysed on water content of plants and its seasonal changes pattern,the status of water deficit of the plants and drought resistance.At the end of the paper,according to the degree of required water and the situation of water deficit of plants,preliminarily put forward some questions which effect on irrigating to Kobresia humilis meadow in different period.

Key words: alpine Kobresia humilis meadow, water content, degree of required water.

摘要： 本项工作测定了高寒矮嵩草草甸10种主要植物不同物候期的水分含量、自然饱和亏、临界饱和亏和需水程度,分析了植物含水量及其季节性动态规律,了解了植物不同发育阶段的水分亏缺状况和抗旱性,并根据植物需水程度和水分饱和亏,初步提出不同时期灌溉对矮嵩草草甸生长的影响。

关键词: 高寒矮嵩草草甸, 含水量, 需水程度