生物多样性 ›› 2008, Vol. 16 ›› Issue (2): 126-132.DOI: 10.3724/SP.J.1003.2008.06232

• 论文 • 上一篇    下一篇

紫茎泽兰入侵地区土壤种子库特征

党伟光1,2, 高贤明1,*(), 王瑾芳1,2, 李爱芳1,2   

  1. 1 中国科学院植物研究所植被与环境变化国家重点实验室, 北京 100093
    2 中国科学院研究生院, 北京 100049
  • 收稿日期:2007-11-24 接受日期:2007-12-12 出版日期:2008-03-20 发布日期:2008-02-20
  • 通讯作者: 高贤明
  • 作者简介:*E-mail:xmgao@ibcas.ac.cn
  • 基金资助:
    中国科学院知识创新工程重大项目(KSCX1-SW-13-03-06)

Soil seed bank traits in an area invaded by Eupatorium adenophorum

Weiguang Dang1,2, Xianming Gao1,*(), Jinfang Wang1,2, Aifang Li1,2   

  1. 1 State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093
    2 Graduate University of Chinese Academy of Sciences, Beijing 100049
  • Received:2007-11-24 Accepted:2007-12-12 Online:2008-03-20 Published:2008-02-20
  • Contact: Xianming Gao

摘要:

土壤种子库是植物潜在的种群, 其时空分布格局对植物群落的动态与稳定性有着举足轻重的影响, 尤其是在受外来种入侵危害地区, 土壤种子库的特征对生态系统的恢复和未来植被的结构、功能、组成与动态等更为重要。本文通过野外调查与萌发实验相结合的方法研究了四川攀枝花市紫茎泽兰(Eupatorium adenophorum)入侵地区的植被组成和紫茎泽兰种子雨前后土壤种子库的变化, 初步探讨了受入侵地区种子库中包括紫茎泽兰在内的物种的种类与储量情况。结果表明: (1)在紫茎泽兰危害严重的地带, 群落组成比较简单, 草本层以紫茎泽兰最为丰富, 种群构成为1-4年生植株及其荫庇下大量的实生幼苗, Drude多度极大, 频度达100%; (2) 在土壤种子库中有13种高等植物出现, 与植被组成的相似度为0.31; 土壤种子库总储量为3,180粒/m2, 其中紫茎泽兰1,950粒/m2, 占总储量的61.3%。种子库各层种子储量不同, 上层种子少于中下层, 差异不显著 (P>0.05), 在土壤下层(5-10 cm层)的紫茎泽兰种子仍然可以萌发; (3) 种子雨后,表层土中(0-2 cm)紫茎泽兰种子总储量为4,733粒/m2;紫茎泽兰种子雨后种子萌发出现2个峰值, 分别为第9天与第17天, 表明土壤中的紫茎泽兰种子会阶段性打破休眠。紫茎泽兰在当地植被和土壤种子库中都占绝对优势, 其他物种从种子阶段就开始亏缺, 是紫茎泽兰不断更新和难以彻底控制的重要原因。

关键词: Eupatorium adenophorum, 种子库, 种子雨, 本地植物, 恢复

Abstract

Soil seed banks are potential plant populations; therefore, their temporal and spatial patterns affect future plant community dynamics and stability. In the regions invaded by Eupatorium adenophorum, soil seed bank traits can play a key role in construction and function of future ecosystems. We studied the vegetation and soil seed banks in an area invaded by E. adenophorum in Panzhihua, Sichuan Province using a combination of field work and germination trails. We explored seed density and species composition in soil seed banks before and after a seed rain of E. adenophorum. The results showed that: (1) The experimental sites were so heavily damaged byE. adenophorum that the vegetation was simple; in shrub layers, mean coverage and frequency of Coriaria nepalensis, Ficus tikoua, Desmodiunm elegans, Abelia parvifolia and Pistacia weinmannifolia were higher than other shrubs. In herb layer, E. adenophorum, ranging in age between 0 and 4 years, was the most abundant as its Drude abundance was Soc and the frequency was 100%. (2) Seeds of 13 species were found in soil seed banks. The similarity index for species in the vegetation and in the soil seed bank was 0.31. The density ofE. adenophorum seeds was 1,950/m2, accounting for 61.3% of total storage in the soil seed bank (3,180/m2), and there were not significantly (P>0.05) fewer seeds in upper layer than other layers. (3) Total seed storage before the seed rain ofE. adenophorum (1,950 seeds/m2) accounted for 41.2% of the storage after the seed rain (4,733 seeds/m2). After the seed rain, germination of E. adenophorum seeds from the soil showed two peaks at the 9th and 17th day, implying that seeds could periodically break dormancy. Our results indicated that E. adenophorum played a priority role in the soil seeds. The scarcity of other species in the seed banks was the main reason that E. adenophorum population regenerated and flourished continuously, and the invasion of E. adenophorum was hard to control.

Key words: Eupatorium adenophorum, soil seed banks, seed rain, local plant species