【摘要】 通过不同氮水平稻田杂草野慈菇(Sagittatia trifolia)的取样测定,研究了野慈菇在开花前期、盛花期和结实期各构件的营养元素(N)生殖分配特点。结果表明:从开花前期到结实期,野慈菇各器官中的全氮含量及总氮含量基本呈增加趋势,根茎中氮元素分配比例上升,叶中氮元素分配比例下降,生殖器官中氮元素分配比例上升;在盛花期,氮元素分配格局表现为:叶>根茎>花>生殖附属器官(花葶),随着供氮量的增加,根茎中氮元素分配呈增大趋势,叶中氮元素分配呈减小趋势,氮元素生殖分配比例为:N2>N3>N1>CK;在结实期分配格局,则为:根茎>叶>果>生殖附属器官(花葶),优先将氮元素分配给营养贮藏器官——根茎,随着供氮量的增加,根茎中氮元素分配呈下降趋势,叶中氮元素分配呈上升趋势,氮元素生殖分配比例为:N3>N2>CK>N1;同时,在低供氮量下(CK和N1),野慈菇以无性繁殖为主;在高供氮量下(N2和N3),野慈菇则以有性繁殖为主。更多还原

【Abstract】 Through sampling measure on paddy field weed Sagittaria trifolia under different nitrogen levels, each component nutrient element (N) reproductive allocation was researched in the seeding stage, the flowering stage and the ripening stage. The results indicated that from seeding stage to ripening stage, each organ total nitrogen content and the whole nitrogen content increased, nitrogen element allocation to root and stem increased, to leaf decreased, to the reproductive organs increased. In flowering stage, nitrogen element allocation pattern showed that leaf > root and stem > flower > scape, and nitrogen element to root and stem increased, to leaf decreased with supplying nitrogen increased and nitrogen element reproductive allocation ratio show that N 2 >N 3 >N 1 >CK. In ripening stage, nitrogen element allocation pattern showed that root and stem > leaf > fruit > scape, the priority of nitrogen element was allocate to reserve organ (root and stem), and nitrogen element allocation to root and stem decreased, to leaf increased with supplying nitrogen increased, and nitrogen element reproductive allocation ratio show that N 3 >N 2 >CK>N 1 . Meanwhile, Sagittatia trifolia gave priority to clone reproduction in low nitrogen supply level (CK and N 1 ), to sexual reproduction in high nitrogen supply level (N 2 and N 3 ).更多还原