樟子松、油松种子储藏寿命的预测

PREDICTING ON THE SEED STORAGE LIFE EXPECTANCY OF PINUS SYLVESTRIS VAR. MONGOLICA AND P. TABULAEFORMIS

本文定期测定在25种温湿度组合条件下储藏的樟子松和油松种子的发芽率,建立了改进生活力方程。该方程考虑了储前环境条件对种子寿命的影响,种子寿命(对数)和含水量的微凹曲线及其与储藏温度的微凸曲线,可预测不同种批在更大范围环境条件下的储藏寿命。利用改进生活力方程对樟子松和油松拟合了生活力列线图。利用此图可以预测在0—40℃,5％—25％含水量范围內,樟子松和油松种子的任一批种子在任一储藏条件下的种子寿命,并且通过此图可找出任一批种子的最佳储藏条件。

In this paper, the germination rates of Pinus sylvestris var. mongolica and P. tabulaeformis seeds stored under 25 kinds of different combination of tempcrature and moisture content are determined and the improved viability equations are established. The equation take into account the variation in seed expectancy which is affected by the environment condition of storage. The curve of relationship between lg seed life expectancy and moisture content is slightly concave and slightly convex between lg seed expectancy and temperature. In this way, the equations are more accurate over a wilder range of storage environment. These improved equations have been incorporated into a seed viability homograph for these species which may be used not only to predict seed expectancy of any seed lots in any storage environment within the range from 0℃ to 40℃ and from 50% to 20% moisture content, but also to the best storage condition for any seed lots.