浙江天童亚热带常绿阔叶林栲树叶片发育动态

Leaf Growth of Castanopsis fargesii in Evergreen Broad-Leaved Forest in Tiantong National Forest Park of Zhejiang,China

于2008年3—6月,定期记录了浙江天童亚热带常绿阔叶林栲树(Castanopsis fargesii)的展叶情况,包括标记枝的叶长、叶宽、叶面积、叶干重、叶鲜重和叶绿素含量等指标。结果表明,所调查的栲树叶面积增加持续时间为34 d,展叶速率最高达40.5%.d-1;成熟叶面积越大,其展叶速率越快;比叶重随叶面积增加呈波动变化,含水量在叶片发育过程中呈先增加后降低的变化趋势,叶绿素含量则随叶面积的增加而逐渐增高。对栲树展叶速率、叶面积和叶属性之间的相关分析结果显示,展叶速率分别与叶面积、叶绿素含量在α=0.01水平上呈显著正相关,叶面积分别与含水量、叶绿素含量在α=0.01水平上呈显著正相关;叶绿素含量与含水量在α=0.01水平上呈显著正相关。

Leaf expansion and leaf traits of Castanopsis fargesii,including leaf length,leaf width,leaf area,leaf dry mass per unit area and chlorophyll,together with leaf phenology,including timing of leaf emergence,duration of emergence,expansion,and leaf expansion rate,were investigated from the beginning of March to early June of 2008,in the evergreen broad-leaved forest in the Tiantong National Forest Park of Zhejiang,China.It was found that the leaf area increment duration was 34 days;the highest leaf expansion rate 40.5%·d-1;the larger the mature leaf area,the higher the leaf expansion rate;the specific leaf weight increased in a fluctuant way;the leaf water content increased in the first phase of leaf development and declined in the late phase;and the leaf chlorophyll content increased gradually with the leaf area.The correlation analyses of the leaf expansion rate,leaf area and leaf properties show that leaf expansion rate is positively and significantly related to leaf area and chlorophyll content（α=0.01） separately.Leaf area is positively and significantly related to leaf water content and chlorophyll content（α=0.01） separately.Leaf chlorophyll content is also positively and significantly related to leaf water content（α=0.01）.