光温因子对结缕草种子产量性状的影响

对不同时间开花的结缕草(Zoysia japonica Steud.)进行定量观测,结合相应时期的气象资料,分析不同阶段光温因子对种子产量性状的影响.结果表明:结缕草的小穗数与穗分化各阶段的积温呈负相关,而与光照时间呈正相关,其中以抽穗期前15～40d的影响最为明显(r=0.89);花序长度与积温呈负相关,而与光照时数呈正相关,但相关系数都较小;结实率、种子数与积温、光照时数均呈正相关,其中以抽穗期前5d和后15d光温因子互作对结实率和种子数的影响较大;种子千粒重与积温呈负相关,而与光照时数呈正相关(r=0.95),以抽穗期后10～20d光温因子互作对千粒重影响较大.

Effects of Light Duration and Temperature to the Seed Yield of Zoysia japonica Steud

We surveyed from April to June 2003 zoysiagrass plants flowering at different times, and analyzed the effect off sunlight duration and temperature of different days of the month to the zoysiagrass seed yield, in reference to the meteorological data of relevant periods. The result shows that the number of zoysiagrass spikelet is correlated negatively with the accumulated temperature and positively with the light duration during the different stages of the spike differentiation period; the effect is more obvious within 15 to 40 days prior to the plant heading period(r=0.89). The spike length is correlated negatively to the accumulated temperature, and positively to the light duration, though the correlation coefficient is limited, The setting percentage, and the seed number per spike are positively correlated to the light duration and accumulated temperature, more particularly, during the 5 days before and 15 days after the plant heading period. The thousand-seed weight of zoysiagrass is negatively correlated to accumulate temperature but positively to the light duration(r=0.95), particularly, 10 to 20 days after the plant heading period.