不同水生植物对磷的吸收特性

Phosphorus uptake characteristics of six aquatic plants

试验用营养液培养方法研究6种水生植物对磷的吸收特性。结果表明:慈菇等6种水生植物对磷均有较强的吸收能力,磷水平的高低会影响植物的生长;在不同生长阶段,植物对磷的吸收速率有明显差异;试验过程中慈菇的总吸收量最高,香蒲的总吸收量最低。采用耗竭法做吸收动力学试验,结果表明空心莲子草和泽泻的最大吸收速率较高,对磷的亲和力较强,香蒲和狭叶泽泻的最大吸收速率较低,对磷的亲和力较弱。

The ability of phosphorus uptake by aquatic plants was investigated in nutrient solution experiments. The results showed that the six aquatic plants had strong ability in phosphorus uptake. Phosphorus levels had a great effect on growth of the plants and all the plants had different phosphorus uptake rate at different grow periods. Sagittaria sagittfolia had the highest total uptake quantity, while Typha orientalis Presl had the lowest total uptake quantity. The uptake kinetics experiments results indicated that Herba alternantherae and Alisma plantagoaquatica Linn had higher uptake rate and stronger affinity for phosphorus. Typha orientalis Presl and A. canaliculatum had lower maximum uptake rate and weaker affinity for phosphorus.