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首页> 外文期刊>Limnology >Factors controlling the distribution of aquatic macrophyte communities with special reference to the rapid expansion of a semi-emergent Phalaris arundinacea L. in Bibi River, Hokkaido, northern Japan
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Factors controlling the distribution of aquatic macrophyte communities with special reference to the rapid expansion of a semi-emergent Phalaris arundinacea L. in Bibi River, Hokkaido, northern Japan

机译：控制水生植物群落分布的因素，特别是在日本北部北海道比比河中半生的ala鱼arundinacea L.的迅速扩张

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摘要

To identify the causes of the rapid expansion of the semi-emergent Phalaris arundinacea L. community in a nutrient-loaded river, we investigated the factors that determine the distribution of the Phalaris and other aquatic macrophyte communities and the shoot growth of P. arundinacea. The Phalaris community was distributed through areas with high organic nitrogen (Org-N), total phosphorus (T-P), PO4-P and suspended solids (SS) concentrations and low dissolved oxygen (DO). P. arundinacea shoots grow better in deep mud and high SS and T-P, all of which were strongly correlated with slower stream currents. Accordingly, although the concentration of total nitrogen constantly increased from 1985 to 1998, the determining nutrient for the expansion of the Phalaris community and P. arundinacea shoot growth stimulation was phosphorus rather than nitrogen. The Phalaris community increased rapidly between 1991 and 1996, when brief but prominent loadings of phosphorus were observed. We concluded that the Phalaris community was restricted due to phosphorus deficiency under nitrogen excess until 1991 and subsequently rapidly expanded over the channel due to the temporary excess phosphorus present during this period. Thereafter, the rapid expansion of the Phalaris community was maintained by the clogging effect of the floating mats formed by shoots and their remains of P. arundinacea, which results in slower currents. A slower current resulted in low DO, the sedimentation of degraded plant remains (high Org-N), and the adsorption of phosphorus by suspended matter (high SS and T-P). The anaerobic conditions caused by low oxygen and the accumulation of decomposable organic matter ensure the continuous development of the Phalaris community through the release of soluble phosphorus from the sediment.
机译：为了确定在营养丰富的河流中半萌生的ala草群落快速扩张的原因，我们调查了决定and草和其他水生植物群落分布以及and草苗生长的因素。 ala草群落分布在有机氮（Org-N），总磷（T-P），PO4 -P和悬浮固体（SS）浓度高，溶解氧（DO）低的区域。 P. arundinacea枝条在深泥浆和高SS和T-P中生长更好，所有这些与缓慢的水流密切相关。因此，尽管从1985年到1998年总氮的浓度不断增加，但是，用于扩展ala草群落和P. arundinacea芽生长的决定性养分是磷而不是氮。在1991年至1996年之间，当观察到短暂但突出的磷含量时，Ph草群落迅速增加。我们得出的结论是，直到1991年，由于在氮过多的情况下磷缺乏，deficiency草群落受到限制，由于在此期间存在暂时的过量磷，因此在整个通道内迅速扩张。此后，通过由芽和其残留的铜绿假单胞菌形成的漂浮垫的堵塞作用，保持了ala草群落的快速扩张，这导致了水流变慢。较慢的电流导致低溶解氧，降解的植物残渣沉淀（高Org-N）和悬浮物对磷的吸附（高SS和T-P）。低氧和可分解有机物的积累引起的厌氧条件，通过从沉积物中释放出可溶性磷，确保了ala草群落的持续发展。

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