水青树不同径级个体构件水平上的生殖配置研究  

Reproductive Allocation in Each DBH Class for Tetracentron sinense Oliv.at Individual Modules Level

作　　者：王东[1,2] 甘小洪[1,2] 张雪梅[1,2] 童佳惠 陈杨[1,2] 吴小松[2] 

机构地区：[1]西华师范大学西南野生动植物资源保护教育部重点实验室,四川南充637009 [2]西华师范大学生命科学学院,四川南充637009

出　　处：《林业科学研究》2017年第4期667-673,共7页Forest Research

基　　金：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"(NO.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"(NO.12ZA169)

摘　　要：[目的]通过对濒危植物水青树的生殖配置进行研究,探讨其生殖与生存之间的权衡关系,揭示其生活史对策及其濒危机制。[方法]对固定样地内的不同径级水青树个体的标准生殖枝生物量进行观测,对不同径级个体的差异采用多重比较分析,对生殖配置(RA)、生殖构件与营养构件生物量采用相关性分析和线性回归分析,对种子数量与千粒质量进行相关性分析。[结果](1)随径级的增大,水青树的生殖和营养投入呈现同增同减的趋势,没有明显的权衡关系;(2)水青树的生殖分配(RA)随径级的变化呈现先上升后下降的趋势;(3)水青树的生殖投入与营养投入、叶生物量之间呈显著正相关,而其RA与营养投入、叶生物量之间呈显著负相关;(4)生殖构件各组分中,种子生物量所占比重均为最小,且远远低于生殖的附属结构(果序轴和果皮);种子数与种子大小之间存在权衡关系。[结论]在构件水平上,水青树的营养投入对生殖投入具有促进作用;其生殖期可划分为生殖初始期、生殖增长期、生殖高峰期和生殖衰退期等4个时期;其种子特征在生殖不同时期分别采取不同的生活史对策,可能是水青树在长期演化发展过程中形成的生殖适应性对策。[Objective] The purpose of this study is to explore the reproductive allocation （RA） of Tetracentron sinense Oliv. and the relationship between reproductive and vegetative investment, and thus investigate the life history strategies and reasons causing this species endangered. [Method] Using fixed-area sampling plot in Meigu Dafengding Nature Reserve, the reproductive modules biomass of individuals with different DBH（diameter at breast height）class were collected and measured. Multiple comparison analysis was conducted to compare the differences in reproductive investment and allocation among different DBH class. The relationships between RA, reproductive modules biomass and the nutrient modules biomass were analyzed by correlation and linear regression analysis. [Result] （1） With increasing DBH, the reproductive and vegetative investment showed the same changing trend, and no trade off appeared between them; （2） At the level of modules, the RA value increased at the beginning and then decreased with increasing DBH; （3） The reproductive investment was positively correlated with the vegetative investment or leaf biomass significantly. However, RA was negatively correlated with the vegetative investment or leaf biomass significantly; （4） For the reproductive module, RA was significantly and negatively correlated with the dry weight of the shaft infructescence axis biomass. In contrast, there was a significantly positive correlation between seed biomass and pericarp biomass. A trade-off existed between seed quantity and size. [Conclusion] Vegetative investment had a promotional effect on the reproductive investment. The reproductive period of T. sinense. could be divided into four periods： initial, increment, peak, and decline phases. The seeds at different reproductive phases may have different life history strategies, reflecting the reproductive adaptation strategies during the process of evolution and development in this species.

关 键 词：水青树 构件 径级 生殖配置 

分 类 号：S792.99[农业科学—林木遗传育种]