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通过实验检验了克隆植物结缕草在异质生境条件下的生理整合作用。结缕草被栽植于4种类型的“生境”内(它们的总体土壤氮素资源水平呈现梯度变化),并同时对匍匐茎的节间实施连接与切断2种处理。实验结果表明,呈连接状态的结缕草克隆的平均复合节数量、平均匍匐茎长度和生物量在各个生境类型间并未表现出明显的差异。但主匍匐茎实施切断处理后的结缕草克隆的上述各项指标均显著减小。生长于贫瘠土壤斑块上的复合节平均根系生物量和根/茎比均高于肥沃土壤斑块。这一特征与其它典型的克隆植物明显不同。结缕草克隆在保持连接的情况下,土壤氮素对节间长度和比节间长度的伸长生长以及分蘖的形成具有促进作用。实验过程中的节间切断处理抑制了节间的进一步伸长但提高了比节间长度。保持结缕草克隆整合并尽量避免严重干扰显得十分重要,特别是在结缕草早期生长阶段。
The physiological integration of the clonal plant Zoysiagrass under heterogeneous habitat was tested through experiments. Zoysiagrass was planted in four types of “habitats” (their total soil nitrogen resource levels showed a gradient change), and at the same time, the stolons were connected and cut in two ways. The experimental results showed that the average number of knots, average stolon length and biomass in the ligated grass-roots were not significantly different among different habitat types. However, all the above indexes of zoysiagrass cloned after the stolons were severed were significantly reduced. The average root biomass and root / shoot ratio of the hybrids grown on the infertile soil patches were higher than those of the fertile soil patches. This feature is significantly different from other typical clonal plants. Zoysiagrass colonization promoted the growth of internode length and internode length and the formation of tillering by soil nitrogen, while maintaining connectivity. Internode cut-off during the experiment inhibited further internode elongation but increased specific internode length. It is important to keep the zoysiagrass integrated and try to avoid serious interference, especially in the early growth stages of zoysiagrass.