摘要
辽东栎种子产量对其种群更新和恢复具有重要意义.调查研究了黄土高原马栏林区天然辽东栎次生林的种子产量,结果表明,该区天然辽东栎次生林处于较成熟阶段,结实植株所占比例高且种子产量丰富.分析发现,辽东栎结实植株数目表现出密度依赖效应,即样地结实植株密度与辽东栎植株的大小呈极显著的负相关,而辽东栎结实植株比例与样地密度呈极显著的负相关.通过对标准枝上发育良好种子和败育种子数目的分析发现,在植株水平受精胚珠数与其发育种子数呈极显著的正相关;单株理论种子产量与胸径呈极显著的线性关系,表明辽东栎个体大的植株产生更多的种子;而对不同结实枝条,其高度与受精胚珠数、败育种子数和发育种子数均呈极显著的线性关系,表明传粉或光照可能起到重要作用.此外,阳坡辽东栎林结实植株比例显著低于阴坡,表明样地水平坡向对辽东栎林结实也有一定的影响.
The seed production of Quercus wutaishanica is important for the regeneration and restoration of its population. The investigation of seed production from the natural secondary forest of Q. wutaishanica in Malan Forest Region on the Loess Plateau, China demonstrated that the oak forest was at stable stage with high frequency of trees with abundant seeds. Analysis showed that the number of trees with seeds was density dependent. Among the samples average tree size was negatively correlative to the density of adult trees, while stand density was negatively correlative to the frequency of trees with seeds. The statistics of well developed and aborted seeds in standard branches indicated that the number of fertilized ovules was positively correlative to that of well developed seeds. It was linear between estimated seed production and DBH in plants, suggesting that larger trees had more seeds. For the branches with seeds, the height of branch was positively correlative to the numbers of fertilized ovules, and developed and aborted seeds, indicating the important effect of pollen and light. Moreover, the frequency of adult trees was lower on sunny slopes than on shady slopes, indicating that seeds in oak trees were affected by slope aspect. Fig 5, Tab 3, Ref 19
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2009年第1期16-20,共5页
Chinese Journal of Applied and Environmental Biology
基金
国家重点基础研究与发展规划资助项目("973"项目
No.2002CB111505)~~
关键词
种子产量
种子败育
辽东栎
天然次生林
黄土高原
seed production
seed abortion
Quercus wutaishanica
natural secondary forest
the Loess Plateau
作者简介
通讯作者Corresponding author（E-mail：wangxa@snnu．edu.cn）
