【摘要】 利用连续流动收集系统收集了油菜、荞麦根分泌物，对介质ｐＨ变化、分泌物中碳水化合物组成及有机酸进行了测定。结果表明，荞麦、油菜生长介质中ｐＨ值变化的差异反映了它们泌质子能力的差异。在油菜分泌物中检测出高水平的鼠李糖，在荞麦中则是阿拉伯糖含量最高。草酸、琥珀酸是两种作物根分泌物的主要有机酸。苹果酸、柠檬酸在油菜根分泌物中没有检测出。更多还原

【Abstract】 The pH value changes in the rooting medium,composition of carbohy-drates,and organic acids of the rape and buckwheat root exudates,got with continuousflowing collecting system,were determined.The results show that the different changesof pH values reflect the different H￣+ -excetion ability in the two crops. High level ofRhampose was found out from the root exudates of rape while high level of Arabinosefrom buckwheat.Oxalic and Succinic acids were the main organic acids in the root exu-dates from both crops. No malic and citric acids were found in rape exudates.更多还原