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不同供氮条件下水稻的化感抑草作用与资源竞争分析
引用本文:熊君,林文雄,周军建,吴敏鸿,陈祥旭,何华勤,郭玉春,梁义元. 不同供氮条件下水稻的化感抑草作用与资源竞争分析[J]. 应用生态学报, 2005, 16(5): 885-889
作者姓名:熊君  林文雄  周军建  吴敏鸿  陈祥旭  何华勤  郭玉春  梁义元
作者单位:福建农林大学生命科学学院, 福州 350002
基金项目:国家自然科学基金项目(30471028),福建省科技厅重大资助项目(20020F012,2004NZ014).
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  
文章编号:1001-9332(2005)05-0885-05
收稿时间:2004-11-17
修稿时间:2004-11-17

Allelopathy and resources competition of rice under different nitrogen supplies
XIONG Jun,Lin Wenxiong,ZHOU Junjian,WU Minhong,CHEN Xiangxu,HE Huaqin,GUO Yuchun,LANG Yiyuan. Allelopathy and resources competition of rice under different nitrogen supplies[J]. The journal of applied ecology, 2005, 16(5): 885-889
Authors:XIONG Jun  Lin Wenxiong  ZHOU Junjian  WU Minhong  CHEN Xiangxu  HE Huaqin  GUO Yuchun  LANG Yiyuan
Affiliation:School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
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.
Keywords:Oryza sativa   Allelopathy   Resources competition   Nitrogen stress   Econiche   Allelopathy-competition separation based bioassay (ACS).
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