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应用生态学报 ›› 2005, Vol. 16 ›› Issue (5): 885-889.

• 研究论文 • 上一篇    下一篇

不同供氮条件下水稻的化感抑草作用与资源竞争分析

熊君, 林文雄, 周军建, 吴敏鸿, 陈祥旭, 何华勤, 郭玉春, 梁义元   

  1. 福建农林大学生命科学学院, 福州 350002
  • 收稿日期:2004-11-17 修回日期:2005-02-03 出版日期:2005-05-15 发布日期:2005-05-15
  • 通讯作者: 林文雄,E-mail:zjwxlin@pub5.fz.fj.cn
  • 基金资助:
    国家自然科学基金项目(30471028)和福建省科技厅重大资助项目(20020F012,2004NZ01-4).

Allelopathy and resources competition of rice under different nitrogen supplies

  1. School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
  • Received:2004-11-17 Revised:2005-02-03 Online:2005-05-15 Published:2005-05-15

摘要: 为探讨化感水稻在不同氮素水平下的生物干扰现象,提出了一种新的测试方法———化感竞争分离法(allelopathyandcompetitionseparation basedbioassay,ACS),成功地区分了在稻/稗共生系统中水稻化感作用与资源竞争及其在不同N条件下的反应特性.结果表明,水稻PI312777具有较强的生物干扰能力.在不同N水平下,其资源竞争能力较强且表现稳定,但化感作用潜力则随供N水平的下降而明显增强.水稻Lemont不具化感作用潜力,在供N水平正常或充足条件下,其资源竞争能力减弱,但在N胁迫下却明显增强.这是在环境资源贫乏时,稻/稗共生系统中生态位竞争加剧的结果.

关键词: 水稻, 化感作用, 资源竞争, N胁迫, 生态位, 化感, 竞争分离法

Abstract: In order to explore the bio-interference of allelopathic rice with barnyardgrass under different nitrogen supplies,a new bioassay method,i.e.,allelopathy-competition separation based (ACS) approach was recommended in this study.The results indicated that ACS could be successfully used to distinguish the rice allelopathy from its resources competition in rice-weed co-culture system,and to evaluate its response characteristics under different N supplies.The test rice accession PI312777 had a higher ability in interfering target weed barnyardgrass (BYD),represented by its stable and higher ability in resources competition,as well as its increasing allelopathic potential in suppressing companion weed BYD when the N supply decreased in the co-cultured system.The reverse was true in the case of rice accession Lemont,which had a lower allelopathic potential under all N supply levels,and a lower ability in resources competition under normal or rich N supply.But,Lemont had an obviously increased ability in resources competition under lower N supply,which was considered as the result of econiche competition in rice-weed system.

Key words: Oryza sativa, Allelopathy, Resources competition, Nitrogen stress, Econiche, Allelopathy-competition separation based bioassay (ACS)

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