大豆生殖生长时期,从植株主茎下部3—4节位起随节位升高比叶重、全氮含量逐渐增加。开花结荚期,下部和中上部节位叶片叶绿素a+b含量较低,中部较高;中下部叶片叶绿素a/b比值较低。鼓粒期,植株中上部叶片的比叶重,叶绿索含量、叶绿素a/b比值明显高于中下部叶片。 Soybean reproductive growth period, from the lower part of the main stem of the plant 3-4 nodes with leaf position higher than the leaf weight, total nitrogen content increased. During the flowering and podding stage, the contents of chlorophyll a + b were lower in the lower and middle upper nodes, and higher in the middle and lower in the middle and lower leaves. At the druing stage, the specific leaf weight, chlorophyll content and chlorophyll a / b ratio of the upper leaves in the plants were significantly higher than those in the middle and lower leaves.