对连香树一年生实生苗一个展叶时期内的单叶生长动态及其叶绿素含量相关性进行了研究，结果表明，单叶叶面积增加持续时间为22 d，平均增长幅度1.98 cm2/d， 叶长、叶宽、叶柄长、叶绿素含量、成熟叶面积的发育趋势为8月份＞7月份＞6月份，展叶速率在展叶期间呈现波动变化，最高每天达41.4％。成熟叶面积越大，其展叶速率越慢。对展叶速率与叶长、叶宽、叶柄长、叶面积、叶绿素含量的相关分析显示，在P=0.01水平上， 展叶速率与叶长、叶宽、叶柄长、叶面积、叶绿素含量呈极显著负相关，叶面积与叶长、叶宽、叶柄长、叶绿素含量呈极显著正相关。叶面积与生长时间的关系符合S型曲线模型。

Dynamic comparation of single leaf in fast-growing period and their correlation of chlorophyll content of Cercidiphyllum japonicum of one year old seedlings was studied， including the indexes of leaf length， leaf width， petiole length， leaf area， leaf thickness and chlorophyll content . The results showed that the increasing duration of average leaf area was 22 d . The average growth rate 1.98 cm2/d， The development trend of leaf length， leaf width， petiole length， leaf area and chlorophyll content was August > July > June.The change of the leaf expansion rate took was fluctuating， the highest value reached to 41.4％ per day; the larger of mature leaf area， the slower of the leaf expansion rate. The correlation analysis between leaf expansion rate and leaf length， leaf width， petiole length， leaf area and leaf thickness showed that the leaf expansion rate had very significant negative correlation with leaf length， leaf width， petiole length， leaf area and chlorophyll content， at P=0.01 level， leaf area has very significant positive correlation with leaf length， leaf width， petiole length and chlorophyll content at P=0.01 level， the relationship between leaf area of katsura tree and growth time did accord with S curve model in different fast-growing period .

S688