关键词: 气温, 气温, 趋势分析, 突变分析, 安康市

Abstract: Laboratory seed germination experiments were conducted to determine the influence of various environmental factors, including temperature, light, pH value, salt stress, osmotic stress, and depth of sowing, on seed germination and seedling emergence ofCapsella bursa-pastoris . The optimum germination occurred at constant temperature 20℃ and fluctuating temperature 20℃/15℃, and the onset of germination was shortened as temperature increased. Alternate light and dark did not have any effect on the germination of Capsella bursa-pastoris seeds. The highest germination inCapsella bursa-pastoris was found under neutral conditions (pH 7) with different pH value treatments; germination decreased sharply under increasing acidity and alkalinity. Seed germination was tolerant to salinity: germination still occurred at 120 mmol/L NaCl (21%), but it was sensitive to osmotic potential and totally inhibited at osmotic potential > -0.9 MPa. Seedling emergence was the highest when seeds were placed on the soil surface but declined with burial depth increasing, and no more emergence was observed with burial depth more than 1.2 cm.