中国特有植物四合木种群的生殖生态特征——种群生殖值及生殖分配研究  

THE CHARACTERISTICS OF REPRODUCTIVE ECOLOGY OF ENDEMIC SPECIES TETRAENA MONGOLICA POPULATION IN CHINA—?Reproductive Value and Reproductive Allocation

作　　者：徐庆[1] 刘世荣[1] 臧润国[1] 郭泉水[1] 郝玉光[2] 

机构地区：[1]中国林业科学研究院森林生态环境与保护所,北京100091 [2]中国林业科学研究院沙漠林业实验中心,磴口015200

出　　处：《林业科学》2001年第2期36-41,共6页Scientia Silvae Sinicae

基　　金：本研究为国家自然科学基金九.五重大项目!(3989336 0 );国家林业局森林生态环境重点实验室基金资助

摘　　要：对四合木种群生殖值和生殖分配进行了研究 ,结果表明 :四合木种群的生殖值从低龄组到高龄组 ,呈现出一种低→高→低的趋势。 3～9a生殖值缓慢增加 ,1 0～ 2 1a生殖值迅速增高 ,1 9～ 2 1a达到最大值 ,2 1a以后生殖值缓慢下降并渐渐平缓。在生境条件较差的群落中 ,四合木种群生殖值较高 ,这可能是其适应恶劣环境所采取的生殖对策。四合木的生殖值受环境因子的选择压力 (kx)以及种群存活率 (Lx)所控制。生殖分配 (RA)与生殖阶段有关 ,从花期到果期 ,RA呈下降的趋势。四合木种群在 4～ 2 1a之间 ,其RA随年龄增大逐渐递增 ,2 1a以后 ,随年龄增大逐渐递减。根据其生殖年龄和生殖分配值大小 ,可将四合木种群的生殖期分为生殖起动期 ( <9a)、生殖增长期 ( 9～ 1 2a)、生殖高峰期 ( 1 3～ 2 7a)和生殖衰退期 ( >2 7a)In this paper,the reproductive value and reproductive allocation of Tetraena mongolica were studied.The results showed that the curve of reproductive value ( V x ) with increasing age tended to be low\|high\|low pattern.The change pattern of V x in the age of 3～9,10～21,and older than 21 years was in the state of slow increase,rapid increase,and slow decrease respectively.The reproductive value was controlled by both the selective pressure of environment ( K x ) and its own survival rate ( L x ).The reproductive allocation value ( RA ) changed with the reproductive phase of T.Mongolica.RA decreased from the stage of flowering to frutiting. RA value increased with the age in the period of 4～21 years and decreased after 21 years.According to the relationship between reproductive age and reproductive allocation,the reproductive phase of the population could be divided into 4 stages:initial (less than 9 years old),increment (from 9～12 years old),peak (13～27 years old),and decline reproductive phase (older than 27 years old).

关 键 词：四合木 种群 生殖值 生殖分配 生殖阶段 生殖年龄 生殖生态学 

分 类 号：Q949.752.6[生物学—植物学]