不同供氮水平下间甲酚对玉米的化感作用  

Allelopathic effect of 3-methyl-phenol on maize under different nitrogen doses

作　　者：柴强[1] 黄高宝[1] 

机构地区：[1]甘肃农业大学农学院,兰州730070

出　　处：《中国生态农业学报》2008年第4期883-886,共4页Chinese Journal of Eco-Agriculture

基　　金：国家自然科学基金(30771264);国家科技支撑计划(2007BAD89B17);甘肃省中青年科学基金(3YS061-A25-021)资助

摘　　要：通过发芽和管栽试验研究了不同供氮水平下,小麦根系分泌物间甲酚对玉米的化感作用。结果表明,间甲酚对玉米幼苗根系产生的化感作用较弱,对地上组织的化感作用较强,其中苗高受间甲酚的影响最明显。氮素与间甲酚对玉米生物产量和根重均存在显著的互作作用,施氮量与间甲酚对成熟期玉米生物产量产生的化感作用呈显著负相关,施N量为300mg·kg-1(土)时,浓度为300×10-6mol·kg-1(土)的间甲酚对玉米生物产量表现为化感抑制作用,但施N量为150mg·kg-1(土)时,相同浓度的间甲酚对玉米生物产量表现为促进作用。间甲酚可增大玉米的根重,施氮可显著提高间甲酚增加根重的作用。农田生态系统中,当存在化感物质时,选择适宜的施肥水平十分重要。Germination and soil column experiments were conducted to investigate the allelopathic effect of 3-methyl-phenol on the growth characteristics of maize. The results show weak effect of 3-methyl-phenol on maize seedling root, but a rather strong effect on aboveground organs, especially seedling height. Significant interaction between nitrogen and 3-methyl-phonel is presented on their effects on bio-productivity, and root weight of maize, with a negative but significant correlation between nitrogen supply and alleopathic effect of 3-methyl-phenol allelopathic on maize bio-productivity at maturity stage. 3-methy-phonel at a concentration of 3.00×10^-4 mol·kg^-1 has a negative effect on maize productivity with a nitrogen dose of 300 mg·kg^-1, but the reverse occurs as nitrogen dose decreases to 150 mg·kg^-1. 3-methyl-phenol increases root weight of maize, and nitrogen application enhances the incresasing effects by 3-methyl-phonel. Therefore, it is very important to determine appropriate fertilizer application rate for allelochemical ecosystems.

关 键 词：化感作用 发芽试验 生物产量 根重 施氮量 

分 类 号：S147.2[农业科学—肥料学]