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Table 1 Distribution of the three biomass fractions (g fresh weight/m ² ) for the defined vegetation types

From: Occurrence of macrophyte monocultures in drainage ditches relates to phosphorus in both sediment and water

		Duckweed type (n=20)	Waterweed type (n=17)	Mixed type (n=13)
June 2007
Free floating plants	Mean	1080	27	307
	Standard error	240	15	155
	Minimum	14	0	0
	Maximum	3411	231	2056
Elodea nuttallii	Mean	16	1102	233
	Standard error	16	302	104
	Minimum	0	18	0
	Maximum	318	4708	1078
Other submerged plants	Mean	0	91	794
	Standard error	0	58	317
	Minimum	0	0	0
	Maximum	3	833	3444
Total	Mean	1096	1219	1335
	Standard error	239	320	319
	Minimum	14	18	150
	Maximum	3411	4708	3444
September 2007
Free floating plants	Mean	1120	61	202
	Standard error	224	38	84
	Minimum	7	0	0
	Maximum	3811	572	866
Elodea nuttallii	Mean	15	757	149
	Standard error	15	149	60
	Minimum	0	11	0
	Maximum	300	2328	607
Other submerged plants	Mean	11	43	1174
	Standard error	11	29	336
	Minimum	0	0	67
	Maximum	210	502	4579
Total	Mean	1146	860	1525
	Standard error	221	165	376
	Minimum	7	11	79
	Maximum	3811	2385	4676

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