【摘要】 在不同供氮水平条件下 ,不同桑树品种根、枝、叶中全氮、全磷含量及其累积量存在着极显著差异。施氮处理比无氮处理根、枝、叶中全氮含量及其累积量极显著增加 ,全磷含量极显著降低 ,磷素累积量除叶片无显著差异外 ,根和枝条中均极显著增加。整个植株全氮含量 :叶片 >根 >枝条 ;全磷含量 :根≈叶片 >枝条。整个植株根、枝、叶的氮素累积及无氮处理的磷素累积 :叶片 >根 >枝条 ;施氮处理 ,根、枝条、叶片中磷素累积量相差不大更多还原

【Abstract】 Under the different nitrogen conditions the content and accumulation of nitrogen and phosphorus in different organs of mulberry trees were significantly different.At higher nitrogen rate the content of total nitrogen and accumulated nitrogen were increased significantly,and the content of total phosphorus was increased in roots and shoots except leaves.According to content and accumulation of nitrogen and the accumulation of phosphorus in roots in treatment without nitrogen supplying decreased in the order:leaves,roots,shoots.The content of phosphorus in leaves was almost the same to that in roots and higher than that in shoots.The accumulated phosphorus in roots,shoots and leaves at higher nitrogen rate was not significantly different更多还原