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首页> 外文期刊>Limnology >Effects of nutrient levels in surface water and sediment on the growth of the floating-leaved macrophyte Trapa maximowiczii: Implication for management of macrophytes in East Bay of Lake Taihu, China
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Effects of nutrient levels in surface water and sediment on the growth of the floating-leaved macrophyte Trapa maximowiczii: Implication for management of macrophytes in East Bay of Lake Taihu, China

机译：地表水和沉积物中养分水平对浮叶大型植物Trapa maximowiczii生长的影响：对太湖东湾大型植物管理的启示

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摘要

Trapa maximowiczii is a floating-leaved macrophyte common in China. The plant population in East Bay, Lake Taihu, has been expanding rapidly in recent years. In order to better understand the mechanisms controlling the population dynamics in this species, two outdoor experiments were conducted from 9 May to 8 July 2007, evaluating the effect on the growth of T. maximowiczii of different nutrient levels in water column and sediment. Results showed that high concentration of nutrients (nitrogen and phosphorous) in water led to significant increases in rosette diameter and plant dry weight, dry weight of aquatic roots and anchoring roots, but had no effect on plant height or main stem node count. Phosphorus enrichment resulted in increases in plant dry weight and seed number. However, no such difference was observed between the nitrogen enrichment treatment and the control. Sediment fertility had significant effects on plant growth. Plant height, plant dry weight, dry weight of aquatic and anchoring roots, and maximum rosette diameter were significantly greater in high-nutrient sediment than those in low-nutrient sediment. This study suggests that eutrophication of water (especially increasing phosphorus loading) and accumulated nutrients in sediment may be among the causes leading to increasing biomass of the floating-leaved macrophyte T. maximowiczii in East Bay of Lake Taihu.
机译：Trapa maximowiczii是中国常见的浮叶大型植物。近年来，太湖东湾的植物种群迅速增加。为了更好地了解控制该物种种群动态的机制，于2007年5月9日至7月8日进行了两次户外实验，评估了水柱和沉积物中不同养分水平对大锥虫生长的影响。结果表明，水中高浓度的养分（氮和磷）导致莲座丛直径和植物干重，水生根和锚定根的干重显着增加，但对植物高度或主茎节数没有影响。磷的富集导致植物干重和种子数量的增加。但是，在氮富集处理和对照之间没有观察到这种差异。沉积物的肥力对植物的生长有重要影响。高养分沉积物中的植物高度，植物干重，水生根和锚固根的干重以及最大莲座丛直径显着大于低养分沉积物。这项研究表明，水的富营养化（尤其是磷含量的增加）和沉积物中积累的养分可能是导致太湖东湾浮叶大型植物T. maximowiczii生物量增加的原因之一。

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