Plant Diversity ›› 2015, Vol. 37 ›› Issue (2): 177-183.doi: 10.7677/ynzwyj201514085

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Effects of Altitudes and the DBH of Seed Trees on Biological Characteristics of Tetracentron sinense (Tetracentraceae) Seeds

 LI  Huai-Chun, GAN  Xiao-Hong   

  1. College of Life Science, China West Normal University, Nanchong, Sichuan 637009, China
  • Received:2014-05-30 Online:2015-03-25 Published:2014-09-15
  • Supported by:

    国家自然科学基金项目“种子遗传质量是否是限制水青树种群更新的根本原因?—以美姑龙窝水青树种群为例” (31370367);四川省教育厅自然科学重点项目“濒危植物水青树种群更新限制的影响机制研究” (12ZA169)

Abstract:

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 30-40cm maybe in reproductive peak.

Key words: Tetracentron sinense, Altitude, DBH, Seed, Biological characteristic

CLC Number: 

  • Q 948.1