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OALib Journal期刊
ISSN: 2333-9721
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岷江百合的生物量分配对策及其海拔效应
DOI: 10.3724/SP.J.1145.2014.00254, PP. 254-260
Keywords: 异速生长,同速生长,岷江百合,繁殖分配,营养分配
Abstract:
生物量分配关系是植物生活史对策研究的核心内容，生境梯度对植物各组分生物量分配关系特别是营养与繁殖分配权衡具有重要影响.以集中分布于岷江上游的珍贵野生资源植物岷江百合（liliumregale）为对象，采用标准化主轴估计（standardizedmajoraxisestimation，sma）和异速生长分析（allometricscalinganalysis）的方法，研究其各组分在海拔梯度上的分配比例及各组分之间的生物量分配关系.结果表明，岷江百合个体总生物量在数值上以中海拔较高（中海拔为100.45g，高、低海拔分别为81.48g，67.94g），但各组分生物量百分比随着海拔变化呈现出不同的分配格局，总体上营养分配比例随着海拔升高而降低，繁殖分配比例随着海拔升高而升高.植株各组分（除叶外）生物量之间均呈现成比例（同速，共同斜率为0.963-1.127，p为0.416-0.985）生长关系.岷江百合全株、地上和地下部分的营养与繁殖分配均为同速生长关系（共同斜率为0.856-0.891，p为0.403-0.873）；在营养分配一定的情况下，高海拔植株的繁殖分配比例较低海拔高.植物叶片生物量与总生物量呈现不成比例的生长关系（斜率大于1，p=0.575），可能原因是叶面积与叶生物量和总生物量分配的“报酬递减效应”.因此，与群落尺度上的研究类似，单个物种各组分之间的生物量分配同速生长关系是普遍存在的；生境压力相对较大的高海拔物种的生物量分配对策倾向于繁殖分配高于营养分配.
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