Effect of surface water accumulation on morphological structure and biomass of Phragmites australis.

Effects of surface water accumulating on Morphological Structure and Growth of Phragmites australis were studied.The results showed that,(1)Effects of the depth of surface water on rhizome width,internode length,and knot number of P.australis were significantly;(2)The average rhizome widths of Phragmites australis under three kinds of water accumulating status on soil surface ranked perennial droughtseasonal hydroceleperennial hydrocele;(3)The water accumulating affected significantly the proportion of rhizome to fibre.The proportion of rhizome weight to whole underground biomasses in perennial drought condition was 91.84%,that in perennial hydrocele was 54.95%,but that in seasonal hydrocele condition was 45.13%;(4)The water accumulating had significant effects on the individual growth of P.australist.The individual in perennial drought condition was thickset and rare,and the density of individuals in seasonal hydrocele soil was small,but the biomasses were most,while individuals in perennial hydrocele condition were thin and dense.