四季竹生态自适应的立竹秆形结构特征

The characteristics of culm structure to ecological self adaptability of Oligostachyum lubricum ramet

关键词:  四季竹  秆形结构因子  生态自适应性

Key words:  Oligostachyum lubricum  culm structure factors  ecological auto adaptability

摘要:

植株结构是植物对环境响应的基础，是植物生态自适应的机制之一。为探究四季竹的生态自适应性，对四季竹立竹秆形结构因子进行了调查和分析。结果表明：四季竹立竹胸径与立竹全高、立竹枝下高、立竹胸高壁厚，立竹全高与立竹胸高壁厚、立竹枝下高均呈极显著正相关，立竹节间长与立竹全高呈显著正相关，其它结构因子间相关性不显著。立竹全高、立竹枝下高与立竹胸径间均具有极显著的二次函数关系，分别为TH=-171.849+69.96D-0.194D2和BH=47.306+7.433D-0.115D2，立竹胸高壁厚与立竹胸径呈极显著的线性函数关系，WT=-0.1447+0.2453D。在试验四季竹林中立竹相对全高、相对枝下高和相对胸高壁厚的平均值均比较稳定，分别为30.27、9.36和0.24。立竹秆形结构特征在一定程度上可以解释四季竹的生态自适应性。

Abstract:

Modular structure，the basic of environmental response of plant，is one of the ecological auto adaptive mechanisms of plant. Characteristics and relationship among culm structure factors of ramet were measured and analyzed to reveal ecological auto adaptability of Oligostachyum lubricum. Very significant positive correlation between diameter at breast height(DBH) and stem total height(TH)，height under branch(BH)，wall thickness at breast height(WT)，and between TH and WT，BH were found. There were significant positive correlation between internode length(IL)and TH，while no significant positive correlation among other culm structure factors wes found. The relation between DBH and TH，BH，WT could be described as TH=-171849+69.96D-0.194D2，BH=47.306+7.433D-0.115D2，WT=-0.1447+0.2453D，respectively. Ramet relative TH (RTH)、relative BH (RBH) and relative WT(RWT) were 30.27，9.36 and 0.24 respectively，and were stable in test forest. The characteristics of culm structure could reveal the mechanism of ecological auto adaptability of O.lubricum ramet to some extent.