不同供氮水平下野慈菇生物量分配及形态可塑性的研究  

A Study on Biomass Allocation and Morphological Plasticity of Sagittaria trifolia L.under Different Nitrogen Levels

作　　者：郭伟[1] 邓巍[1] 孙备[1] 潘星极[1] 赵丽丽[1] 燕雪飞[1] 

机构地区：[1]沈阳农业大学农学院,辽宁沈阳110866

出　　处：《江西农业大学学报》2011年第3期452-457,共6页Acta Agriculturae Universitatis Jiangxiensis

基　　金：辽宁省教育厅高等学校创新团队科研项目(2009T088);沈阳农业大学博士后基金项目

摘　　要：通过对盆栽,并以不同氮素水平处理的稻田杂草野慈菇(Sagittatia trifolia L.)的取样测定,研究野慈菇在不同生育期各构件的生物量分配特点以及形态特征。结果表明:不同处理下,野慈菇的叶柄长和叶片长具有较大的可塑性,而处理间的变异度较小;从开花前期到结实期,野慈菇各器官生物量及总生物量呈增加趋势,根茎生物量分配比例上升,叶生物量分配比例下降,生殖器官分配比例上升;在盛花期,生物量分配格局表现为:叶>根茎>生殖附属器官(花葶)>花,随着供氮量的增加,根茎生物量分配呈增大趋势,叶生物量分配呈减小趋势;在结实期分配格局则为:根茎>叶>果>生殖附属器官(花葶),优先将生物量分配给营养贮藏器官——根茎,随着供氮量的增加,根茎生物量分配呈下降趋势,叶生物量分配呈上升趋势。同时,在低供氮量下(CK和N1),氮素成为限制因素,野慈菇以营养生长和无性繁殖为主;在高供氮量下(N2和N3),野慈菇则以生殖生长和有性繁殖为主。供氮量影响野慈菇营养繁殖器官和有性繁殖器官生物量分配策略,使其生长和繁殖策略都出现权衡。Through potting and sampling measures for the paddy field weed Sagittaria trifolia L.under different nitrogen element levels,each component biomass allocation and the morphological characters were studred in different growth stages.The results indicated that in each treatment,there was a large plasticity on the petiole length and leaf length,and a small variation among treatments.From the seeding stage to the ripening stage,each organ biomass and the total biomass increased,the biomass allocation of root and stem increased,that of leaf decreased,that of the reproductive organ increased.In the flowering stage,the biomass allocation pattern showed that leaf root and stemscape flower,and the biomass of root and stem increased,that of leaf decreased with increasing nitrogen supply.In the ripening stage,the biomass allocation pattern showed that root and stem leaf fruitscape,the priority of biomass was allocate to reserve organ（root and stem）,and the biomass allocation of root and stem decreased,that of leaf increased with increasing nitrogen supply.Meanwhile,the nitrogen element became a limiting factor,giving priority to vegetative growth and clone reproduction in a low nitrogen supply level（CK and N1）.And Sagittatia trifolia L.gave priority to reproductive growth and sexual reproduction in a high nitrogen supply level（N2 and N3）.Nitrogen supply affected biomass allocation strategy of vegetative reproductive organ and sexual reproductive organ,making its growth and reproductive strategy trade-off.

关 键 词：氮 野慈菇 生物量 生殖分配 可塑性 

分 类 号：S451.1[农业科学—植物保护]