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破碎生境中种群大小对缙云卫矛生殖成功的影响

胡世俊1,何平2**,张春平2,张益锋2   

  1. (1西南林业大学林学院 国家林业局西南地区生物多样性保育重点实验室, 昆明 650224; 2西南大学生命科学学院,重庆 400715)
  • 出版日期:2013-04-10 发布日期:2013-04-10

Effects of population size on reproductive success of endangered plant Euonymus chloranthoides Yang in fragmented habitat.

HU Shi-jun1, HE Ping2**, ZHANG Chun-ping2, ZHANG Yi-feng2   

  1. (1Key Laboratory of Biodiversity Conservation in Southwest China (State Forestry Administration), Faculty of Forestry, Southwest Forestry University, Kunming 650224, China; 2Life Science Faculty, Southwest University, Chongqing 400715, China)
  • Online:2013-04-10 Published:2013-04-10

摘要:

生境破碎导致种群大小的降低,了解种群大小对生殖成功的影响对物种保护具有重要的指导意义。缙云卫矛(Euonymus chloranthoides Yang)为重庆特有濒危植物,目前缙云卫矛种群已遭受了严重的生境破碎,种群小且多处于隔离状态。本文对位于重庆北碚的该物种6个种群的生殖成功进行了研究。结果表明:小种群的自然坐果率低,种群间坐果率差异极显著(P=0.002);种群大小与坐果率之间呈显著相关(r=0.837, P=0.038);种群大小与种群幼苗比例呈显著相关(P=0.045),较小的种群中一龄级幼苗的比例也较小。这表明生境破碎后小种群不利于该物种的生殖成功,导致小种群的坐果率与幼苗比例降低。对该物种的保护要提高小种群的座果率,改善小种群的更新。
 

关键词: 生长策略, 形态特征,  , 养分吸收, 河竹, 鞭根系统, 淹水

Abstract: Habitat fragmentation can cause the decline of population size. To understand the effects of population size on reproductive success is of significance in species conservation. Euonymus chloranthoides Yang is an endemic and endangered plant in Chongqing of Southwest China. At present, the E. chloranthoides population has suffered from severe habitat fragmentation, with small population size and mostly in isolate status. In this paper, six E. chloranthoides populations at Beibei in Chongqing were selected to study the effects of population size on their reproductive success. Smaller populations had a lower natural fruiting rate, and the differences in the fruiting rate among the six populations were extremely significant (P=0.002). There was a significant correlation between the population size and fruiting rate (r=0.837, P=0.038). The population size had a significant correlation with population’s seedling ratio (P=0.045), and the first ageclass seedling ratio of the smaller populations was also smaller. The present study indicated that habitat fragmentation induced the decrease of the fruiting rate and seedling ratio of smaller populations of E. chloranthoides, which was not beneficial to the reproductive success of the plant species. Therefore, to conserve the E. chloranthoides, it would be necessary to enhance the fruiting rate of the small populations and improve their regeneration.

Key words: growth strategy, morphological characteristics, nutrient absorption, Phyllostachys rivalis,  rhizome and root system, waterlogging.