FECUNDITY ALLOCATION IN HERBACEOUS PLANTS
FECUNDITY ALLOCATION IN HERBACEOUS PLANTS
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DOI：
10.2307/3545013
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发表时间：
1992-11-01
期刊：
影响因子：
3.4
通讯作者：
TAYLOR, DR
中科院分区：
文献类型：
--
作者：
AARSSEN, LW;TAYLOR, DR
本文研究了21种草本植物的生殖力与植物大小（生殖力分配）的关系。在物种内，大小/繁殖力回归主要是线性的，但往往不同的网站之间的斜率显着。物种在r2和坡度上变化很大。一次结实的物种一般有更大的r2值和更陡的斜率比多次结实的物种，特别是无性系多年生植物。物种之间的繁殖力分配的变化的影响进行了探讨，在其作为竞争能力的一个组成部分（即竞争下的健身）的作用。对于线性关系，生殖力分配作为竞争能力的一个组成部分的作用是定义的斜率和X-截距的生殖力与大小回归。它们的相对作用取决于竞争的激烈程度（即资源供求比率）。我们预测，一个更大的斜率变得更加重要，在定义相对竞争能力时，植物。当植物被迫相对较小时（在相对激烈的竞争或资源贫乏的条件下），较小的X截距变得更加重要。
The relationship between fecundity and plant size (fecundity allocation) was studied in twenty-one herbaceous species collected from natural populations. Within species, size/fecundity regressions were predominantly linear but the slopes often varied significantly among sites. Species varied widely in r2 and slope. Monocarpic species generally had greater r2 values and steeper slopes than polycarpic species, especially clonal perennials. The implications of variation in fecundity allocation among species are explored in terms of its role as a component of competitive ability (i.e. fitness under competition). For linear relationships, the role of fecundity allocation as a component of competitive ability is defined by both the slope and the X-intercept of the fecundity versus size regression. Their relative roles depend on the intensity of competition (i.e. the resource supply/demand ratio). We predict that a greater slope becomes more important in defining relative competitive abilities when plants are. allowed to get relatively large (under relatively weak competition or resource-rich conditions), whereas a smaller X-intercept becomes more important when plants are forced to be relatively small (under relatively intense competition or resource-impoverished conditions).