生态学报2018，Vol.38Issue(11)：3931-3942,12.DOI:10.5846/stxb201705030818
种群密度对大果虫实形态特征与异速生长的影响
Influence of population density on morphological traits and allometric growth of Corispermum macrocarpum
摘要
Abstract
The aims of this study were to reveal the allometric relationships between population density,plant morphological characteristics,and organ biomass allocation,and to elucidate the adaptive strategy of the plant during the restoration of degraded land.Specifically,we used allometric analysis to evaluate the effect of density on morphological characteristics and the distribution of the biomass of organs in Corispermum macrocarpum.Our results showed that density strongly affects the plant architecture.With an increase in density,the height of C.macrocarpum decreased,and the branch number and length clearly decreased.The biomass of all organs decreased significantly with an increase in density.With an increase in the population density,the biomass allocation was decreased to stem and reproductive organs,but increased to the root and leaf organs.These findings are consistent with the prediction of optimal allocation theory in the context of moisture,nutrient,and light limitation.The allometric relationship of height vs.root biomass was significantly influenced by density.Changes of root vs.above-ground biomass,leaf vs.root,and reproductive organs vs.root were not related to population density,indicating a state of ' apparent plasticity.' The allometric relationships of root vs.stem,stem vs.above-ground biomass,leaf vs.other organs,and reproductive organs vs.other organs were significantly affected by population density,showing a state of ' true plasticity.' Our results suggest that population density changes the ontogenesis system of plant architecture in C.macrocarpum,and can indeed affect the allometric relationships of organs,resulting in a trade-off in biomass allocation among organs to complete the life history.关键词
异速生长/株高/生物量分配/表型可塑性/大果虫实Key words
allometry/height/biomass allocation/phenotypic plasticity/Corispermum macrocarpum引用本文复制引用
范高华,张金伟,黄迎新,神祥金,禹朴家,赵学勇..种群密度对大果虫实形态特征与异速生长的影响[J].生态学报,2018,38(11):3931-3942,12.基金项目
国家重点研发计划(2016YFC0500606) （2016YFC0500606）
国家自然科学基金项目(31570454) （31570454）
中国科学院野外台站联盟项目(KFJ-SW-YW026) （KFJ-SW-YW026）
