不同阶段的光温因子对羊草种群种子生产性状的影响

EFFECTS OF SUNSHINE—TEMPERATURE FACTORS IN DIFFERENT STAGES ON SEED YIELD OF ANEUROLEPIDIUM CHINENSE POPULATION

本文根据羊草的花期长达一个月的自然特性,从种群水平对不同时间开花的羊草个体进行定量观测,结合相应时期的气象资料,分析不同阶段的光温因子对羊草种群穗器官及籽粒产量性状的影响。羊草种群的小穗数和小花数均与穗分化各阶段的积温和光照时间呈不同程度的负相关,其中以抽穗期前的5～15天的影响最为明显。穗的长度与穗伸长期各阶段的积温呈负相关、与抽穗期后的光照时间呈正相关,其中以抽穗期前10天的光温影响较为明显。抽穗期前20天的光温因子对结实率和每穗籽粒数的影响较为明显,每穗籽粒重量与抽穗期的前15天的光温因子的关系最为密切。

The flowering—period of Aneurolepidium chinense which lasts about one month. The flowering features of the individuals were observed quantitatively at the intervals within the population. The effects of sun shine and temperature on the spikelet and seed yield were analysis using the data collected in the field and the meteorological data. Both spikelets and florets of A. chinense population were correlated negatively with accumulated temperature and sunshine time in different extent during the stage of spike differentiation. The sunshine—temperature during the period of 5 to 15 days before earing showed the most obvious effects. The spike length was correlated negatively with accumulated temperature in extending of spike axle, and positively with sunshine time after earing—term. But sunshine—temperature during the period of 10 days before earing was the most important factor. Both setting percentage and grains per spike were more obviously influenced by the sunshine—temperature factors on 20 days before earing—term. The grain weight per spike with sushine—temperature factors were related on 15 days before earing—term most closely.