蒲公英花期种群构件的生物量结构与异速生长分析
2017-08-30张丽辉倪秀珍汤庆莲
张丽辉 倪秀珍 汤庆莲
摘要:采用大样本随机取样的方法,选取30株蒲公英(Taraxacum mongolicum Hand.Mazz)开花植株,对其根、茎、叶、花等构件的生物量及物质分配关系进行定量分析。结果表明:蒲公英种群花期各构件生物量的变异系数分别为54.11%、59.48%、111.21%和64.65%,具有较大的表型可塑性;其生物量与生物量分配的大小具有相同的规律:叶>花>根>茎。蒲公英植株大小随着根、茎、叶及花生物量的增加呈幂函数形式增加,各功能构件生物量与有性繁殖构件之间均呈极显著的幂函数异速生长关系。
关键词:蒲公英;花期;种群;构件;生物量;异速生长;物质分配;表型可塑性;幂函数
中图分类号:Q945.5文献标志码:A文章编号:1003-935X(2017)01-0020-05
Biomass Structure and Allometric Analysis on the Modules of
Taraxacum mongolicum Population at Flowering Stage
ZHANG Lihui1,NI Xiuzhen1,TANG Qinglian2
(1.School of Life Seienee,Changehun Normal University,Changchun 130032,China;
2. The Fourth Middle School of Jiutai District of Changchun City,Changchun 130051,China)
Abstract: The biomass of the root,stem,leaf and flower,as well as the relationship of biomass allocation were studied in 30 flowering plants of Taraxacum mongolicum with a large number of random samples in the field. The results showed that the module biomass and biomass allocation of T. mongolicum were decreased in the order of leaf>flower>root>stem at the ripening stage. Their variation coefficients were 167.51%,173.79%,207.37% and 125.79%,respectively,indicating a high phenotypic plasticity. The module biomass had significant positive correlations with biomass allocation,which exhibited similar pattern: leaf>flower>root>stem (modules). The size of T. mongolicum plants increased with an increase of the module biomass,which was described by a power function. Reproductive modules had significant positive correlation with the functional modules at the power function with the latter increment.
Key words: Taraxacum mongolicum;module;biomass;allometry
收稿日期:2017-02-16
基金项目:国家自然科学基金(编号:31570412);吉林省教育厅科学技术研究项目[编号:吉教科合字(2016) 第394号]。
作者简介:张丽辉(1971—),女,河北昌黎人,博士,副教授,主要从事繁殖生态学研究。E-mail:zhanglihui_91@163.com。
通信作者:倪秀珍,博士,教授,主要从事生物化学的教学与研究。E-mail:xiuzhenni@163.com。异速生长是指生物体某一特征的相对生长速率不等于第2种特征的相对生长速率[1],植物各个功能器官或构件表现出生长不同步的现象,它通常以幂函数的形式表示[2]。异速生长分析可以了解许多植物的表型可塑性,能揭示植物生物学特征间的与尺度无关的内在规律,因而引起生态学家的高度重视,相关报道较多[3-4]。Kleiber定律认为,新陈代谢率和个体大小呈现3/4幂指数关系,但该定律是否具有“普适性”是目前争论的焦点,迫切需要对植物进行大量系统性的研究[2]。……p>
