<正>将毛竹（Phyllostachys edulis）竹秆等长分割成40段，分别测量备竹段底边周长、壁厚、节隔厚，研究毛竹竹秆直径与材积的垂直格局。并构建毛竹竹秆直径相对值、相对外围累计村积、相对实际累计材积和相对节隔累计材积与竹秆相对高度的回归模型、毛竹外围村积、实际材积和节隔材积与胸径的回归模型等共7个模型。结果表明：不同胸径的毛竹竹秆直径相对值、各相对累计材积随着相对高度的增加·变化规律表现出显著的一致性，反映了毛竹竹秆结构方面的共性。

The ultra-structure of Liriodendron chinense (Hemsl.) Sarg.×L. tulipifera L. pollen was studied by transmission electron microscope. Correlative physiological indexes were determined during the development of bud. The results showed that the form of abortive microspore mother cell was abnormal, the cytoplasm was condensed and the structure of organelle was fuzzy at the initial stage of anther development. Then it lost division function and couldn’t under go meiosis. Generally normal microspore mother cells were round or oval. The cell whose cytoplasm was abundant and organelle structure was clear could complete the normal meiosis. Contrarily, it only could enter meiosis but not finish it. So the normal tetrad didn’t come into being. And the deformed tapetum cell caused stasis of anther development, disintegrating of cells, fusing, piling up and deforming. At the same time, the content of RNA, protein and amino acids reduced constantly in the course of stamen development.