Gebauer G, Schubert B, Schuhmacher M I, Rehder H, Ziegler H
Institut für Botanik und Mikrobiologie der Technischen Universität München, Arcisstr. 21, D-8000, München 2.
Centro de Ecologia, Universidad National de Cordoba, Argentina.
Oecologia. 1987 Mar;71(4):613-617. doi: 10.1007/BF00379307.
Two C grasses (Hordeum vulgare L., Avena sativa L.) and two C grasses (Panicum miliaceum L., Panicum crus-galli L.) were cultivated in standard soil in the open air in pure cultures and in various mixed cultures at low and high nitrogen fertilization levels. After three months the dry weight, length and nitrogen content of the aboveground and below-ground parts of the plants and the shoot/root ratios were determined. Hordeum vulgare was the most successful species irrespective of the nitrogen fertilization level, and also exhibited in most cases the highest nitrogen concentrations. Panicum miliaceum, on the other hand, was the species least able to compete. The production of biomass was reduced in cultures growing under nitrogen starvation conditions, this phenomenon being more pronounced with respect to the C than to the C species. The decrease in the production of biomass at low N conditions was most drastic with Panicum crus-galli, the species with the lowest nitrogen content and thus assumed to be best adapted to nitrogen starvation conditions. In cultures growing at low nitrogen fertilization levels the shoot/root ratios of all species.shifted in favour of an increasing root proportion. The extent of this shift, however, differed from species to species.
两种C₃禾本科植物（大麦、燕麦）和两种C₄禾本科植物（黍、稗）在露天的标准土壤中进行纯培养，并在低氮和高氮施肥水平下进行各种混合培养。三个月后，测定了植物地上和地下部分的干重、长度、氮含量以及茎/根比。无论氮肥水平如何，大麦都是最成功的物种，并且在大多数情况下其氮浓度也最高。另一方面，黍是最不具竞争力的物种。在氮饥饿条件下生长的培养物中生物量产量降低，这种现象在C₃物种中比在C₄物种中更为明显。在低氮条件下，生物量产量下降最为剧烈的是稗，该物种氮含量最低，因此被认为最适应氮饥饿条件。在低氮肥水平下生长的培养物中，所有物种的茎/根比都朝着根比例增加的方向变化。然而，这种变化的程度因物种而异。
