Effects of Altitudes and the DBH of Seed Trees on Biological Characteristics of Tetracentron sinense (Tetracentraceae) Seeds
In this paper,the dry weight,plumpness,morphological characteristics and germination of Tetracentron sinense seeds collected from different altitude and DBH (diameter at breast height) in Meigu Dafengding Nature Reserve were investigated,and the effects of altitude and DBH on the biological characteristic of T.sinense seeds were discussed.With the increase of altitude,the dry weight and plumpness of T.sinense seeds increased first and then decreased,but the germination and morphological characteristics decreased gradually.All biological characteristics showed a highly significant correlation with altitude except for dry weight.With the increase of DBH,all biological characteristics of T.sinense seeds first gradually increased and then decreased.The width and thickness of seeds were highly correlated with DBH,but others were not significant.The results showed that:(1) The altitude was one of the most dominating ecological factors leading to geographical variation of biological characteristics of T.sinense seeds; (2) The DBH has little impact on the biological characteristic of T.sinense seeds; (3) The reproductive period of T.sinense could be divided into four periods,and the period with the DBH of 30-40 cm maybe in reproductive peak.
NETL
NSTL
万方数据
维普
