密度对尖头叶藜生物量分配格局及异速生长的影响
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国家自然科学基金项目(31570454);国家重点研发计划(2016YFC0500606);中国科学院青年创新促进研究会(2016210)


Effects of population density on the biomass allocation and allometric growth of Chenopodium acuminatum
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    摘要:

    植物器官指示植物不同的功能,而植物器官生物量分配比例的变化表征了植物对资源获取能力的调整。在植物生长发育过程中,植物各器官呈一种明显的异速生长规律。利用异速生长分析方法,通过模拟不同密度(16、44.4、100、400株/m2)下尖头叶藜(Chenopodium acuminatum)的生长特性,研究密度对尖头叶藜器官生物量分配格局及异速生长的影响。结果表明,随密度增加,尖头叶藜地上和地下器官都存在不同程度的竞争:其中,根和主茎生物量分配增加,茎和地上生物量分配减少,而叶和繁殖生物量分配不随密度变化而变化。研究发现,尖头叶藜各器官间具有显著的异速生长关系:其中叶:主茎、根:地上部分、根:茎、根:主茎、繁殖器官:地上部分及繁殖器官:根生物量间的异速生长不随密度变化而变化,属于表观可塑性;而叶:地上部分、叶:根、叶:茎、茎:地上部分、主茎:地上部分、繁殖器官:茎、繁殖器官:主茎生物量间具有极显著的异速生长关系,异速指数和个体大小显著受密度变化影响,属于真正可塑性,这表明密度能够影响尖头叶藜各器官的生长变化。尖头叶藜叶:主茎、叶:根及主茎:地上部分生物量间的异速指数在D4-密度时与3/4差异不显著(P>0.05),符合生态代谢理论,而在D1-D3密度时与3/4差异显著(P<0.05),表明充分竞争的植株更符合代谢理论,而竞争不激烈的植株对资源的投入具有物种特异性。

    Abstract:

    The organs of plants have different functions and the allocation ratio of organ biomass is closely related to the ability to obtain resources for the plants.Plants organs present allometric phenomena during growth and development.By simulating the growth characteristic of Chenopodium acuminatum in different densities (16,44.4,100,and 400 plants/m2),we used allometry analysis to study the effects of density on the biomass allocation and allometric growth of C.acuminatum.The results showed that,with the increase of density,there were different levels of competition for both aboveground and belowground organs,ie.,the distribution of root and main stem increased,and the distribution of stem and aboveground organs decreased,but the distribution of leaves and reproductive organs did not change with the density.There were significant allometric relationships between each pair organs.The changes of leaves vs.main stem,root vs.aboveground organs,root vs.stem,root vs.main stem,reproductive vs.aboveground organs,and reproductive vs.root of biomass were not affected by the density,with these exhibiting ‘apparent’ plasticity.The allometric relationships of biomass in leaves vs.aboveground organs,leaves vs.root,leaves vs.stem,stem vs.aboveground organs,main stem vs.aboveground organs,reproductive organs vs.stem,and reproductive organs vs.main stem were significantly affected by density,representing ‘true’ plasticity.The results showed that density could affect the growth of C.acuminatum.The allometric index of biomass between leaves vs.main stem,leaves vs.root and main stem vs.aboveground organs in 400 plants/m2 was close to 3/4,which is in accord with the metabolic theory of ecology,while the allometric indexes were significantly (P<0.001) different from 3/4 among other densities.This suggests that the plants with complete competition are more likely to conform to the predictions of metabolic theory,while plants with weak competition exhibit species-specific resource investment.

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范高华,崔桢,张金伟,黄迎新,神祥金,赵学勇.密度对尖头叶藜生物量分配格局及异速生长的影响.生态学报,2017,37(15):5080~5090

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  • 收稿日期:2016-05-03
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  • 在线发布日期: 2017-08-15
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