不同放牧条件下小叶锦鸡儿种子萌发特性研究

Study on Effect of Different Stocking Rates on Seed Germination of Caragana microphylla Lam.

小叶锦鸡儿（Caragana microphylla Lam.）是广泛分布于中国北方草地及农牧交错地区丰富的小灌木,具有很高的生态学和经济价值。通过萌发实验探讨了不同放牧强度下小叶锦鸡儿的种子萌发特性,从而为该种在该地区的植被恢复过程中的作用提供理论数据。研究表明,小叶锦鸡儿的种子萌发不需要光照,在较高温度（20~28℃）时萌发率较高且种子萌发较快,而此时补充光照有利于提高萌发率。采自轻度放牧与重度放牧样地的种子萌发率在相同温度下没有明显的差异,但是放牧强度明显影响了萌发速率。

Caragana microphylla Lam.is a widely distributed shrub species in the northern steppe and agro-pastoral ecotone of China.It has a great ecological and economic value.Many studies concerning the effects of temperature and light on seed germination had been conducted in many parts of the word,however,the studies about different grazing intensities and Caragana genus plant were rare.The study result showed that seed germination of C.microphylla was not influenced by light or darkness.Under 20-28℃ treatments,the species had a higher final percent germination and germination rate,and could increase the final percent germination if supplying light at the same temperature treatment.There were no significant differences in seed final percent germination between the seeds from the light and heavy grazing paddocks,however,the germination rate was decreasing with the increase of grazing intensities.