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

doi:10.7677/ynzwyj201514085

Abstract

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

摘要：

通过对美姑大风顶自然保护区不同海拔和不同胸径水青树（Tetracentron sinense）种子的干重、饱满度、形态特征及萌发特性进行观测，分析了海拔高度和母树大小对水青树种子生物学特性的影响。结果表明，随着海拔高度的增加，水青树种子的干重和饱满度先增加后减小，而萌发率、发芽势、活力指数和形态特征却随海拔的升高而减小；除干重外，水青树种子的其他生物学特性均与海拔之间呈极显著相关。随着胸径的增大，水青树种子的生物学特征均表现出先增加后减小的趋势。除种子的宽和厚与胸径之间具有极显著的相关性外，其他的生物学特征与胸径之间的相关性不显著。结果显示：（1）海拔是影响水青树种子生物学特性的主要生态因子之一；（2）母树大小对水青树种子的生物学特性影响较小；（3）水青树生殖期可分为四个时期，其中30~40cm径级处于生殖高峰期。

关键词: 水青树, 海拔, 胸径, 种子, 生物学特征

CLC Number:

Q 948.1

LI Huai-Chun, GAN Xiao-Hong. Effects of Altitudes and the DBH of Seed Trees on Biological Characteristics of Tetracentron sinense (Tetracentraceae) Seeds[J]. Plant Diversity, 2015, 37(2): 177-183.

李怀春, 甘小洪. 不同海拔与母树大小对水青树种子生物学特性的影响[J]. Plant Diversity, 2015, 37(2): 177-183.

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