Wang Zhen-yu, Wen Sheng-fang, Xing Bao-shan, Gao Dong-mei, Li Feng-min, Hu Hong-ying, Sakoda Akiyoshi, Sagehashi Masaki
Key Laboratory of Ocean Ecology & Environment, Ministry of Education, College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
Huan Jing Ke Xue. 2008 Sep;29(9):2475-80.
Four aquatic plants (Alternanthera philoxeroides, Typha latifolia, Sagittaria sagittifolia, Phragmites communis ) were cultured on P-enriched soil in a pot experiment to assess the phosphorus rhizosphere depletion effect and analysis the ratio of root to shoot, root morphology, phosphorus uptake efficiency and phosphorus use efficiency. An obvious variation in P concentration of the soil in the rhizophere and non- rhizophere was observed. Compared with the non-rhizosphere (available P: 167.53 microg x g(-1)), the available P in the rhizosphere soil of Alternanthera philoxeroides, Typha latifolia, Sagittaria sagittifolia and Phragmites communis was reduced to 80.17, 124.37, 155.38 and 161.75 microg x g(-1) respectively, with 81%, 42%, 18% and 16% reduction ratio of water-soluble phosphorus. More effective phosphorus depletion was achieved in Alternanthera philoxeroides by higher phosphorus uptake efficiency (1.32 mg x m(-1)), while rooting system was small and phosphorus use efficiency was low (0.34 g x mg(-1)). Phosphorus uptake efficiency of Typha latjfolia is much lower (0.52 mg x m(-1)) than that of Alternanthera philoxeroides, however, its strong rooting system enhanced soil exploration, with higher phosphorus use efficiency (0.64 g x mg(-1)) and the ratio of root to shoot (0.35). Alternantshera philoxeroides and Typha latfolia were more effective in phosphorus depletion of the rhizosphere soil than that in Sagittaria sagittifolia and Phragmites communis.
通过盆栽试验，在富含磷的土壤上培养了四种水生植物（空心莲子草、宽叶香蒲、慈姑、芦苇），以评估磷的根际耗竭效应，并分析根冠比、根系形态、磷吸收效率和磷利用效率。观察到根际和非根际土壤中磷浓度存在明显差异。与非根际（有效磷：167.53μg x g(-1)）相比，空心莲子草、宽叶香蒲、慈姑和芦苇根际土壤中的有效磷分别降至80.17、124.37、155.38和161.75μg x g(-1)，水溶性磷的降低比例分别为81%、42%、18%和16%。空心莲子草通过较高的磷吸收效率（1.32mg x m(-1)）实现了更有效的磷耗竭，但其根系较小，磷利用效率较低（0.34g x mg(-1)）。宽叶香蒲的磷吸收效率（0.52mg x m(-1)）远低于空心莲子草，然而，其强大的根系增强了对土壤的探索，具有较高的磷利用效率（0.64g x mg(-1)）和根冠比（0.35）。空心莲子草和宽叶香蒲在根际土壤磷耗竭方面比慈姑和芦苇更有效。
