岷江百合的生物量分配对策及其海拔效应  

Biomass allocation strategies of Lilium regale and their altitudinal effects

作　　者：丁建林[1] 韩越 包维楷[1] 向双[1] 

机构地区：[1]中国科学院成都生物研究所生态恢复重点实验室,成都610041 [2]汶川县林业局,汶川623000

出　　处：《应用与环境生物学报》2014年第2期254-260,共7页Chinese Journal of Applied and Environmental Biology

基　　金：国家"十二五"科技支撑计划项目(2011BAC09B04);国家自然科学基金项目(31000290;31370594)资助~~

摘　　要：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(Lilium regale)为对象,采用标准化主轴估计(Standardized major axis estimation,SMA)和异速生长分析(Allometric scaling analysis)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100.45 g,高、低海拔分别为81.48 g,67.94 g),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.Biomass allocation is a crucial topic of plant life history strategy research. Natural environments always affect the relationship of plant module biomass partitioning, especially that of reproductive and vegetative biomass allocation. Liliurn regale is one kind of valuable wild resource plant in the Minjiang River. The objective of this study was to test if there were allometric relationships between the component biomass allocation changes along altitudes and the biomass allocation among components of L. regale, abd if reproductive biomass allocation increased with the altitude in the way that vegetative biomass allocation did. The biomass of each module and total plant was sampled from three altitudes with three to four habitats at each altitude. One-way ANOVA and LSD comparison were employed to test the differences of biomass values and percentages of individual components of L. regale from three altitudes. The standardized major axis estimation （SMA） was used to test the allometry of bivariate scaling relationship between module traits. We found that the individual total biomass was higher in the middle than the lower altitude, but modules biomass partitioning had different patterns at each altitude. Vegetative partitioning percentages decreased with increase of altitude, but their counterpart reproductive partitioning percentages increased with increase of altitude. The isometric relationship was found between each pair of module biomass allocation except that of leaf mass versus other components biomass. The isometric relationship was also shown between vegetative and reproductive biomass allocation of total, above-ground and below-ground modules. Reproductive allocation was higher in higher altitudes than in lower altitudes at given vegetative biomass. The allometric scaling relationship between leaf mass and total biomass might be due to the ＂diminishing returns effect＂ of leaf area. This study suggested that similar to the previous interspecific results, the common isometric scaling relationship

关 键 词：异速生长 同速生长 岷江百合 繁殖分配 营养分配 

分 类 号：Q948[生物学—植物学]