岷江干旱河谷黄蔷薇和川滇蔷薇更新能力及其限制因素
DOI:
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:

中国科学院西部行动计划资助项目(KZCX2-XB2-02); 国家“西部之光”计划与中国生态系统网络台站基金茂县生态站共同资助项目


Capability and limitation of regeneration of Rosa hugonis and Rosa soulieana in the dry valley of the upper Minjiang River
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 文章评论
    摘要:

    植物种子、种子库和幼苗库的研究是种群更新和植被恢复的重要内容。研究了岷江干旱河谷两种乡土灌木(黄蔷薇和川滇蔷薇)的种子、种子库和幼苗库特征。黄蔷薇和川滇蔷薇种子产量较高, 分别为(627±216)和(7832±4347)果/丛,但种子质量较差,饱满率分别为(49.62±1.03)%和(73.83±3.42)%,活力为(32.25±0.67)%和(55.38±2.5)%。黄蔷薇种子产量和活力低于川滇蔷薇,但其种子重量和休眠程度却远高于川滇蔷薇。两种蔷薇土壤种子库的水平和垂直分布格局相似:在水平分布上,离植株基部越近,种子密度越高;在垂直分布上,种子主要分布在地表层。黄蔷薇和川滇蔷薇种子库密度均较高,分别为(560±90)粒m2和(1955±235)粒/m2,但活力种子数量较少,分别为(26±4)粒/m2和(152±18)粒/m2, 处于休眠状态的种子,黄蔷薇(60.6%)较川滇蔷薇(18.4%)高,可萌发的种子,两者分别为(10±1)粒/m2和(124±14)粒/m2。黄蔷薇(65.3%)的种子库中被啮齿动物取食的比例较川滇蔷薇(0.5%)高。两种蔷薇的幼苗密度差异不大,黄薇幼苗密度((4.28±0.49)株/m2)略小于川滇蔷薇((5.24±1.28)株/m2)。幼苗组成的总体趋势是高度级低的幼苗所占的比例相对较高,且Ⅰ级幼苗数显著高于较其他级幼苗数。研究表明,两种蔷薇种子存在休眠,能形成持久种子库,种子特征对种子库和幼苗库具有深刻影响。两种蔷薇更新状况不佳,比较而言,黄蔷薇更新较川滇蔷薇好。黄蔷薇更新的主要限制因素是动物对种子的破坏,而川滇蔷薇更新的主要限制因素是幼苗存活定居。

    Abstract:

    It is always a problem faced by concerned scientists and ecosystem managers to improve to the vegetation and restore the degraded ecosystem in the dry valley of the upper Minjiang River in China. Investigation of seed bank and seedling establishment is the most important work to understand plant natural regeneration, prompt its use in conservation, restoration and management. In order to address the regeneration capacity and its limitation of two native rose species (Rosa hugonis and Rosa soulieane), the characteristics of seeds, seed banks and seedling banks were investigated along the dry valley of the upper Minjiang River. 60 soil samples with 15 cm×15 cm×5 cm respectively for R. hugonis and R. soulieane were collected to determine the seed densities. 20 samples with 2 m×2 m under the crown were investigated for seedling densities. Seed dormancy was identified as germination percentage of 16-week stratified achenes in 5℃ refrigerator. Both rose species produced large quantity of seeds with poor quality. Relatively low seed number ((627.6±216.3) hips) and viability ((32.25±0.67)%), but high seed weight ((13.97±0.23) mg) and deep seed dormancy were observed in R. hugonis compared with R. soulieane. Two rose species showed the similar distribution pattern of soil seed bank in both upright and horizontal positions. Seeds mainly distributed in the soil surface, and the higher seed density was often observed near the clump. Both R. hugonis and R. soulieana showed high total seed densities ((560±90) and (1955±235) seeds/m2, respectively), but low viable seed densities ((26±4) and (152±18)seeds/m2, respectively). Viable seeds of R. hugonis were distributed deeper in soil than those of R. soulieana. However, much more R. hugonis (65.3%) seeds were nibbled compared to R. soulieana (0.5%) seeds. Additionally, the seedling density of R. hugonis ((4.28±0.49) individuals/m2) was slightly lower than that of R. soulieana ((5.24±1.28) individuals/m2). Most seedlings were only between 1 and 5 cm high for both species. The results suggested that both rose seeds are dormant and have persistent soil seed banks. The distribution and composition of seed banks and seedling banks are closely related to seed characteristics. Poor regeneration capability is found in both rose plants, and R. hugonis behaves better than R. soulieana. The main limitation of regeneration might be the seed destroying by rodents for R. hugonis and the high seedling mortality for R. soulieana.

    参考文献
    相似文献
    引证文献
引用本文

周志琼,包维楷,吴福忠,吴宁*.岷江干旱河谷黄蔷薇和川滇蔷薇更新能力及其限制因素.生态学报,2009,29(4):1931~1939

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数: