几种化感物质对杉木幼苗生长的影响

EFFECTS OF THREE KINDS OF ALLELOCHEMICALS ON GROWTH OF CHINESE FIR SEEDLINGS

采用培养皿滤纸法 ,研究了不同浓度的肉桂酸、苯甲酸、对羟基苯甲酸对杉木 (Cunninghamialanceolata)幼苗生长的影响 .结果表明肉桂酸、苯甲酸、对羟基苯甲酸分别在 1× 10 -5molL-1、1× 10 -3molL-1、1× 10 -4 molL-1浓度时降低了叶绿素含量 (P =0 .0 5 ) ,而在 1× 10 -6molL-1、1× 10 -4 molL-1、1× 10 -5molL-1浓度时抑制了杉木幼苗胚根和胚芽的生长 (P =0 .0 1) .3种酚类物质对胚根生长的抑制作用明显高于对胚芽生长的抑制作用 .在 3种酚类物质中 ,肉桂酸对杉木幼苗生长的抑制作用最强 ,对羟基苯甲酸次之 ,苯甲酸最弱 .这表明酚类物质能在不同程度上抑制杉木幼苗的生长 ,降低其生产力 ,可能是连栽杉木人工林生产力降低的因素之一 .图 2表 1参

The effects of three kinds of allelochemicals with different concentrations on the growth of Chinese fir (Cunninghamia lanceolata) seedlings were studied on filter paper in the 9 cm petri dishes. The results showed that cinnamic acid, benzoic acid and P-hydroxybenzoic acid significantly reduced the chlorophyll content in seedlings of C. lanceolata at concentratioins of 1×10 -6mol L -1, 1×10 -4mol L -1 and 1×10 -5mol L -1 (P=0.05), respectively, while inhibited the growth of seedling radicle and stem at concentratioins of 1×10 -5mol L -1, 1×10 -3mol L -1 and 1×10 -4mol L -1 (P=0.01), respectively. Inhibition on the radicle growth was stronger than that of stem. The effects of allelochemicals on the seedling growth in the order of cinnamic acid>P-hydroxybenzoic acid>benzoic acid. It was suggested that these allelochemicals could reduce productivity of Chinese fir plantation by inhibting growth of its seedlings. Fig 2, Tab 1, Ref 14