The biomass variation of Potamogeton malaianus and its influential factors in Lake Taihu Influences of Allelopathy from Potamogeton malaianus on Isozymes of Scenedesmus obliquus Effects of arsenic speciations on contents of main organic acids in Hydrilla verticillata and Potamogeton malaianus Effects of different water depths and sediments on Potamogeton malaianus in Lake Taihu Seed Germination of Potamogeton malaianus ESTIMATION OF LEAF AREA OF POTAMOGETON MALAIANUS MIQ.AND PRILIMINARY STUDY ON ITS RELATIONS WITH CULTIVATION DENSITIES ECOLOGICAL STUDIES ON POTAMOGETON MALAIANUS MIQ. IN CHINA Physiological Reactions of Potamogeton malaianus to Different N and P Concentrations in the Growth Medium