蒙古莸种子萌发特性研究

Study on Germination Characteristics of Caryopteris mongolica Bunge Seed

摘要: 作为蒙古高原的特有植物，蒙古莸的繁殖特征值得探究。本文研究了温度、光照、土壤含水量和埋藏深度对蒙古莸种子萌发的影响，以期从种子生物学角度揭示蒙古莸种群在干旱地区胁迫环境中生存和繁衍的适应性策略。研究结果表明：蒙古莸种子萌发的最适温度为20℃~25℃，低温和高温对种子萌发均具有明显的抑制作用；而光照对种子萌发具有一定的促进作用；蒙古莸种子在含水量为7%~20%的土壤中具有较高的出苗率，其中以15%最为合适；在5 mm左右覆土厚度下出苗率最高。

Abstract: As one of the endemic plants in Mongolian plateau, the reproductive characteristics of Caryopteris mongolica Bunge deserve more concern. In this paper, effects of temperature, light, soil moisture and burial depth on the germination characteristics of C. mongolica Bunge seed were studied to reveal the adaptation strategy of survival and reproduction of C. mongolica population in arid areas from the perspective of seed biology. The results showed that the optimum temperature for seed germination was 20˚C - 25˚C; low temperature and high temperature inhibited the seeds germination significantly, while light illumination promoted the germination. The optimum soil water content was 7% - 20% and the emergence rate of seedlings came up to 86% when soil moisture was 15%. A layer of 2 - 5 mm covering soil led to the best of seed germination.