草业学报2017，Vol.26Issue(3)：53-64,12.DOI:10.11686/cyxb2016147
种群密度对沙米异速生长的影响
Effect of population density on the allometric growth of Agriophyllum squarrosum
摘要
Abstract
The allometric relationships between plant organs determine the strategies of life history,affecting the coexistence and biodiversity of species.Traditional methods are not able to distinguish the responses of plant traits to environmental or genetic differences but allometric analysis can help solve this problem.Allometric analysis was used to study the relationships between different organs of Agriophyllum squarrosum by simulating different population densities of A.squarrosum (16,44.4,100 and 400 plants/m2) during the restoration of degraded grassland.The results showed that there are significant allometric relationships between organ pairs.Changes in root vs.aboveground biomass,root vs.main stem biomass,leaf vs.root biomass and main stem vs.aboveground biomass were not influenced by population density,indicating ‘apparent plasticity’ The allometric relationships of root vs.stem,stem vs.aboveground,leaf vs.stem biomass and their respective biomass ratio were significantly affected by population density,reflecting ‘real plasticity’.The allometric index of leaf vs.aboveground biomass at 44.4 plants/m2 was approximately 0.75,while the allometric indices at other plant densities were significantly different from 0.75 (P＜0.001),suggesting that environmental changes resulted in changes in growth strategy of A.squarrosum.The influence of population density on the allometric relationships between reproductive and other organs is not significant,indicating that A.squarrosum will adopt the same strategy under different densities,but that density differences will result in different allometric scaling and size of individual reproductive organ during different periods of reproductive development.It is important to consider changes in plant growth stages when investigating the relationships between reproductive organs and individual plants.关键词
种群密度/异速生长/生物量分配/表型可塑性/沙米Key words
population density/allometry/biomass allocation/phenotypic plasticity/Agriophyllum squarrosum引用本文复制引用
范高华,黄迎新,赵学勇,神祥金..种群密度对沙米异速生长的影响[J].草业学报,2017,26(3):53-64,12.基金项目
国家重点研发计划(2016YFC0500606),国家自然科学基金项目(31570454),中国科学院青年创新促进研究会(2016210)和中国科学院野外站联盟项目(KFJ-SW-YW026)资助. （2016YFC0500606）
