无芒雀麦地上生物量及各构件生物量分配动态

Allocated Dynamics of Aboveground Biomass and Structural Biomass in Bromus inermis Leyss

对栽培条件下的4份无芒雀麦材料不同生育期单株地上总生物量及其构件生物量分配变化规律进行了初步研究。结果显示：植株地上总生物量，从拔节期到完熟期4份材料均呈逐渐升高的趋势，从孕穗期到完熟期奇台无芒雀麦和Elsberry无芒雀麦显著高于公农无芒雀麦（P〈0．05）。随生育期的推进，营养枝茎和叶生物量分配先降低后升高，生殖枝茎和花序生物量分配先升高后降低，生殖枝叶生物量分配逐渐降低，立枯体变化规律不明显。生殖生长过程中生殖枝生物量分配占57％～90％。各构件生物量分配中，生殖枝茎占较大比例为21％～53％，花序占3％～30％。在同一生育期，相同构件生物量分配4份材料间差异不显著。在植株构件生物量分配相对稳定的前提下，提高花序生物量是提高种子产量的有效途径。

Allocation of total aboveground biomass of individual and structural biomass of 4 brome grasses in their different growing time under cultivated conditions were studied. The results showed that the total aboveground biomass of the four materials increased gradually from node drawing to full mature while that of Bromus inermis Leyss. cv. ＂Qitai＂ and B. inermis Leyss. cv. ＂Elsberry＂ was obviously higher than B. inermis Leyss. cv. ＂Gongnong＂ from spike gestating to full mature （P（0.05）. As growing time progressed, the allocation of biomass of stem and leaf decreased at first and then increased, but that of the stem of the reproductive shoots and inflorescence increased at first and then decreased, that of leaf in reproductive shoot decreased gradually, and the change of wilted parts among them was not regular. The biomass of reproductive shoots allocated was 57%-90% during reproductive growth. The stem of reproductive shoots was 21%-53% and the inflorescence was 3%-30% in allocation of structural biomass. The difference in the allocation of the same structural biomass among 4 materials was not significant in the same growing stage. So improving the biomass of inflorescence was an effective way to increase the seed yield under the steady allocation of structural biomass.