【摘要】 研究探讨了中国荞麦属1个种及1变种对氮的需肥特性,不同肥料梯度处理对其生理、农艺性状等的综合影响。净光合速率(Pn)与蒸腾速率(Tr)、气孔导度(G s)、胞间间隙CO2浓度(CO2)、叶面温度(Tleaf)、叶绿素含量、光强(PAR)的变化情况及相互关系,对植株体不同层次叶片光合特性进行比较。对3个材料盆栽试验,氮肥(尿素)设5个水平,分底肥(2/3)、追肥(1/3)2次施用,1个对照,共48个处理。盆栽试验处理中,野生荞麦与栽培苦荞对氮素吸收利用表现型差异明显。金荞麦、齿翅野荞对氮的需求能力强于西荞1号;耐低氮瘠薄能力以齿翅野荞为强,西荞1号、金荞麦之间差异不明显;齿翅野荞适应能力强。更多还原

【Abstract】 The paper discussed genotype difference in demand of nitrogen fertilizer use efficiency between cultivated tartary buckwheat and wild buckwheat,including the change and relationship of net photosynthesis(Pn),transpiration(Tr),stomatal conductance(Gs),internal CO2(CO2),temperature of leaf(Tleaf),chlorophyll content.The character of photosynthesis of the different level position leaf was compared.Nitrogen fertilizer adopted two ways.48 treatments was made on five levels and three spcies,additional one CK.Through pod experiment,the genotype difference from nitrogen fertilizer utilization was obvious between cultivatied tartary buckwheat and wild buckwheat.The demand of nitrogen fertilizer of F.cymosum and F.graclipes var.were stronger than that of cultivated species ’Xiqiao No.1’.F.graclipes var.could endure lower fertilizer-nitrogen.F.cymosum and Xiqiao No.1 reaction were almost similar to lower level fertilizer-nitrogen.The adaptability of F.graclipes Var.was strong.更多还原