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作 者 ：王迎春, 侯艳伟, 张颖娟, 杨持

期 刊 ：植物生态学报 2001年 25卷 6期 页码：699-703

关键词：四合木；生殖对策；有性生殖；

Keywords:Tetraena mongolica Maxim, Reproductive strategy, Sexual reproduction,

摘 要 ：通过研究四合木(Tetraena mongolica Maxim)种群的生殖对策，发现四合木既可进行有性生殖，又可进行营养繁殖，以有性生殖为其主要的生殖方式。有性生殖过程中具以下特征：1)具有自交和异交相结合的交配系统，异交比例(50％)高于自交比例(15％)；2)具有花多果少的生殖格局，其开花率与生境、降水、植株年龄关系密切，不同种群的开花率有一定差异，种群的年龄结构对开花率有较大影响。在3～5月降水丰富的情况下，不仅开花比例高(40％～80％)，且每一植株的花量很大。不同年份种群结实率普遍偏低，3～5月降雨较少的1996年平均结实率为19.8％；3～5月降雨较多的1998年为12.2％。只是由于开花基数大，对四合木种群种子的总产量不会造成较大威胁；3)胚胎发育过程中败育比率极高，只有约10％～20％的胚能发育成熟。

Abstract:While sexual reproduction is the major reproductive process in Tetraena mongolica Maxim vegetative propagation is also important. The following are the characteristics of sexual reproduction: 1) a mixed breeding system with self- (15%) and cross-breeding (50%); 2) a pattern of fruit and seed yield in which plants produce many more flowers than fruits; the flowering rate contacts with environment, amount of rainfall, age of plant, which is different in different populations; age structure has a significant effect on the flowering rate of populations; in high rainfall years, both flowering rates (40%-80%), and flowers per plant are high; population seeding rates were low in all of the three years studied (from 19.8% in 1996 to 12.2% in 1998); because of the large amount of flowers produced, the yield of populations is not greatly affected by this low seeding ratio; 3) the embryo abortion rate is very high, with only 10%-20% of embryos maturing.

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