Ecological Archives E086-011-A5

H. M. Valett, M. A. Baker, J. A. Morrice, C. S. Crawford, M. C. Molles, Jr., C. N. Dahm, D. L. Moyer, J. R. Thibault, and Lisa M. Ellis. 2005. Biogeochemical and metabolic responses to the flood pulse in a semiarid floodplain. Ecology 86:220–234.

Appendix E. Average surface and groundwater concentration (µg/L) of nitrate-nitrogen (NO3-N) and soluble reactive phosphorus (PO4-P) associated with flooding of the experimental flood and outside-levee control sites on the disconnected floodplain.

   1993   1994    1995  
  Control site
groundwater		 Flood site groundwater Flood site surface water Control site
groundwater		 Flood site groundwater Flood site surface water Control site
groundwater		 Flood site groundwater Flood site surface water
NO3-N                  
Pre-flood na na na 17 
± 4 (39)
19 
± 3 (39)
na
11 
± 1 (50)
17 
± 5 (38)
na
Flood period
11 
± 3 (45)
28 
± 1 (36)
12  
± 6 (34) 		10 
± 2 (142)		 9 
± 2 (143) 		3 
± 1 (53)
5
± 1 (150)
9 
± 3(150)
6 
± 2 (50)
Post-flood na na na
6 
± 1 (17)
11 
± 1 (16) 		na
12 
± 1 (33)
17
± 10 (29)
na
PO4-P                  
Pre-flood na na na 29 
± 3 (51)
24 
± 3 (48)
na
36 
± 4 (51)
51 
± 11 (39)
na
Flood period 48
± 6 (43)
41 
± 5 (34)
62
± 3 (20) 		36 
± 3 (126) 		50
± 6 (114) 		80
 ± 8 (59)
36
± 2 (150)
50 
± 5 (149)
82 
± 7 (50)
Post-flood na na na
27 
± 4 (17)
24
 ± 2 (16)
na
40 
± 7 (16)
50
± 7 (14)
na

   Notes: Data are means ± SE (n) for samples taken before, during, and following experimental flooding for each of three experimental floods  (1993–1995). na = data not available.

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