短命植物小车前构件属性特征及其相互关系

以准噶尔荒漠广泛分布的短命植物小车前(Plantago minuta)为研究对象,通过野外调查取样,系统分析了植物构件形态、生物量分配特征及其异速比例关系。结果表明,小车前体型较小,全株生物量仅有0.402 3g;根冠比为0.157,繁殖分配和叶片生物量分别占44.2%和36.9%,生物量分配具有个体大小依赖。小车前形态指标之间、构件生物量之间及二者之间多具有显著相关性(P0.05)和异速比例关系,其中构件生物量间多为等比例关系(异速指数=1),形态指标间多为指数1的异速比例关系,而形态特征与生物量间多为指数1的异速比例关系,本研究部分验证了理论预测。构件水平差异化的异速比例关系体现了小车前不同构件对外界环境和内在发育规律的不同响应和适应特征。

Characteristics of modular traits and interrelationships of the ephemeral species Plantago minuta

In this study,the ephemeral species Plantago m inuta,wildly distributed in the Gurbantunggut Desert in central Junggar Basin,China,was selected as the target species,and its the modular morphology,biomass allocation and allometric scaling relationships were systematically analysed based on field investigation and sampling.The results showed that,the body size of P.minuta was small,and its total biomass was only 0.402 3 g.Inaddition,the root to shoot ratio was 0.157,reproductive biomass and leaf biomass accounted for 44.2％ and 36.9％,respectively,and biomass allocation was independent of body size.Significant correlations and allometric scaling relationships were generally found between modular morphological indices,between modular biomasses,and between morphological indices and biomasses.Among these,modular biomass commonly exhibited isometric scaling relationships (allometric scaling exponent=1),modular morphological indices generally showed allometric scaling relationships with the exponent ＞ 1,while allometric scaling relationships with the exponent ＜1 were commonly found between morphological indices and modular biomass.The results partly confirmed the theoretical prediction.The differential allometric scaling relationships of P.minuta at the modular level demonstrated different response and adaptations to the external environment and development regularity of different modular components.