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Plant Diversity ›› 2010, Vol. 32 ›› Issue (03): 270-280.DOI: 10.3724/SP.J.1143.2010.10015

• 研究论文 • 上一篇    下一篇



  1. 1 中国科学院青藏高原研究所昆明部,中国科学院昆明植物研究所,云南 昆明650204;
    2 济南市园林管理局,山东 济南250102
  • 收稿日期:2010-01-14 出版日期:2010-06-25 发布日期:2010-09-06
  • 通讯作者: 杨永平

Altitudinal Variations in Reproductive Allocation of Bergenia purpurascens (Saxifragaceae)

WANG Yun1, HU LiJuan2, DUAN YuanWen1, YANG YongPing1   

  1. 1 Institute of Tibetan Plateau Research at Kunming, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, China; 2 Horticutlure Administration Bureau of Jinan, Jinan 250102, China
  • Received:2010-01-14 Online:2010-06-25 Published:2010-09-06
  • Contact: YANG YongPing

摘要: 资源分配策略是植物生活史研究的重要内容之一,植物用于繁殖的相对资源比例(即繁殖分配)与植株的生活史特征、个体大小及植株的生境密切相关。本文研究了藏东南色季拉山一个阴坡上海拔4 200 m~4 640 m范围内6个不同居群的虎耳草科多年生草本植物岩白菜(Bergenia purpurascens)的繁殖分配特征,结果发现:(1)繁殖器官生物量、营养器官生物量、地上部分总生物量、花数目、花序轴长度均随海拔的升高而显著降低,而叶数目随海拔变化不大,繁殖分配值则先降低后升高,转折点在林线过渡带(海拔4 400 m)处;(2)各居群(海拔4 300 m居群除外)营养器官生物量与繁殖器官生物量均显著正相关,而营养器官生物量与繁殖分配则负相关,但各居群的显著性不同;(3)各居群繁殖器官生物量与植株个体大小(营养器官生物量)呈不同程度的异速增长,而繁殖分配则与植株个体大小负相关;(4)各居群植株都存在一个繁殖所需的个体大小阈值,而且这一阈值在林线以下区域随海拔的升高而显著增大,在林线以上区域变化不显著。研究结果表明,海拔并不是影响岩白菜繁殖分配策略的唯一生态因子,不同居群的生境状况和植株个体大小都与其资源分配策略密切相关,高山地区林线的存在对植物资源的权衡方式会产生巨大影响。

关键词: 繁殖分配;个体大小依赖;繁殖阈值;林线;多年生植物

Abstract: The strategy of resource allocation between vegetative and reproductive functions, quantitative relationship between size and reproductive output are central aspects of plant lifehistory. To test the tactics of resource allocation and its altitudinal trend, we examined the reproductive allocation (RA) of Bergenia purpurascens (Saxifragaceae), in six populations along a shady slope in Sejila Mountain of southeast Tibet, at an altitude gradient from 4 200 m to 4 640 m. Our results showed that (1) with increasing altitude, vegetative biomass, reproductive biomass, total aboveground biomass, flower number per plant and length of flower stalk decreased significantly, but the number of leaves did not change greatly. However, the change of RA did not show a monotonic trend when altitude increased, shifting from significantly decreasing below the tree line to slightly increasing above it; (2) vegetative biomass was positively correlated with reproductive biomass, but negatively correlated with RA in all populations, but the level of significance was different among the populations; (3) RA decreased with individual size in all populations, whereas the relationship between absolute resource allocated to reproduction and individual size was allometric; (4) reproductive allometry and a size threshold for reproduction did exist in this alpine perennial, but the obvious altitudinal trend was only found along the populations below the tree line, not above it. We then concluded the altitude could not fully explain the change of resource allocation strategy of this alpine perennial, and different effects of size and habitat on RA may result from various environmental constraints along the altitudinal gradient or genetic background. Therefore, each individual within a population will follow its own developmental trajectory shaped by its genotype and the habitats. The most innovative finding was plant adaptation and resource tradeoff might be sharply altered at the tree line, which is a sensitive area in alpine mountains. Further investigations are needed to better understand the relationship between the reproductive allocation and changing environmental conditions.

Key words: Reproductive allocation