下寨65和青薯2号化感抑草作用研究

Study on Allelopathic and Weed-inhibiting Effects of Xiazhai 65 and Qingshu 2

【目的】探究高原马铃薯品种对小油菜和野燕麦的化感作用效应。【方法】采用室内生测法,分别测定2个不同的马铃薯品种(下寨65和青薯2号)的地上部分和地下部分粗提物及秸秆腐解液对小油菜和野燕麦种子萌发的影响。【结果】2个品种的粗提物和腐解液对小油菜以及野燕麦的化感作用均具有明显的浓度效应,即随着粗提物和腐解液质量浓度的增加,其对小油菜和野燕麦的化感作用均增强;下寨65和青薯2号地下部分的化感作用明显高于地上部分,粗提物处理组的发芽率明显高于腐解液。【结论】马铃薯化感物质多存在于下寨65和青薯2号的地下部分,且下寨65和青薯2号的粗提物对小油菜和野燕麦的化感作用强于腐解液。

[Objective]This study aims to explore the allelopathic effect of plateau potato on rape and Avena fatua L..[Method]Indoor bioassays were used to determine the effects of the aboveground and underground crude extracts and straw decomposing liquid of two different potato varieties(Xiazhai 65 and Qingshu 2)on the germination of rape and Avena fatua L..[Result]The results showed that the crude extracts and decomposing liquids of the two varieties had obvious concentration effects on the allelopathic effects of rape and Avena fatua L.,that is,with the increase of the mass concentrations of crude extracts and decomposing liquids,their effects on allelopathy of rape and Avena fatua L.were significantly increased.The allelopathic effect of the underground part of Xiazhai 65 and Qingshu 2 was significantly higher than that of the aerial part,and the germination rate of the crude extract was significantly higher than that of the decomposing liquid.[Conclusion]The results indicated that the allelopathic substances mostly existed in the underground part of Xiazhai 65 and Qingshu 2,and the crude extracts of Xiazhai 65 and Qingshu 2 had better allelopathic effects of rape and Avena fatua L.than the decomposing liquid.