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Last modified
7/14/2009 5:02:33 PM
Creation date
5/20/2009 10:50:49 AM
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UCREFRP
UCREFRP Catalog Number
8132
Author
Lieberman, D. and T. Burke.
Title
Limnology and Drift of Particulate Organic Matter Through the Lower Colorado River.
USFW Year
1991.
USFW - Doc Type
Denver, CO.
Copyright Material
NO
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Mean, range, and standard deviation for phosphorus <br />and nitrogen concentrations measured during <br />phase 1 are shown in table 2. The phosphorus forms <br />analyzed during the study were total phosphorus (TP) <br />and orthophosphate phosphorus (PO4-P). All main <br />river stations had low levels of TP and PO4-P. PO4-P <br />was only rarely detected from upstream to down- <br />stream stations (table 10A). For all stations, the mean <br />TP for phase 1 was 0.014 mg/L or below. Increases <br />in TP concentrations were noted from December <br />1986 through February 1987 (at all stations) because <br />of higher flows. For example, TP concentration at <br />(table 11 A): <br />• Davis Dam was 0.004 mg/L in October 1986 and <br />increased to 0.023 mg/L for both December 1986 <br />and January 1987, respectively. <br />• Headgate Rock Dam (further downstream) was <br />0.003 mg/L in October 1986 and increased to <br />0.033 mg/L and 0.043 mg/L during December 1986 <br />and January 1987, respectively. <br />• Yuma was below the detectable limit during <br />October 1986, but increased to 0.036 mg/L and <br />0.030 mg/L during December 1986 and January <br />1987, respectively. <br />The nitrogen forms analyzed were nitrate (NO3-N), <br />nitrite (NO2-N), and ammonia (NH3-N). These three <br />inorganic nitrogen forms are immediately available <br />for uptake by the phytoplankton (Golterman, 1975 <br />[171). Total Kjeldahl nitrogen (TKN), which includes <br />organic nitrogen and ammonia but not nitrite nor <br />nitrate, was analyzed during this study. Mean NO3-N <br />concentrations were lowest during October 1986 (for <br />all stations) and then increased in December 1986, <br />which corresponded to the increased flow <br />(table 12A). <br />• At Davis Dam, NO3-N concentrations were <br />0.127 mg/L during October 1986 and increased to <br />0.391 mg/L during December 1986. <br />• At Imperial Dam, N03-N concentrations were <br />0.111 mg/L during October 1986 and increased to <br />0.362 mg/L during high flows in December 1986. <br />• At Yuma, the same trend was observed where <br />NO3-N concentrations were 0.136 and 0.386 mg/L <br />during October and December 1986, respectively. <br />Table 2.-Range, mean x, and standard deviation s <br />of phosphorus and nitrogen concentrations for <br />phase 1 (Oct. 1986 to June 1987). <br />Standard <br />Station* Nutrient Mean, x Range deviation s <br />mg/L <br />Davis Dam <br />Park Moabi <br />Parker Dam <br />Headgate <br />Rock Dam <br />Palo Verde <br />Diversion <br />Dam <br />Cibola <br />Imperial Dam <br />P04-P 0.001 ndt - 0.008 0.003 <br />Total P 0.007 nd - 0.023 0.010 <br />N03-N 0.348 0.127 - 0.527 0.113 <br />N02-N 0.001 nd - 0.002 0.001 <br />NH3-N nd nd nd <br />TKN 0.252 0.181 - 0.362 0.070 <br />P04-P nd nd nd <br />Total P 0.011 nd - 0.040 0.016 <br />N03-N 0.335 0.134 - 0.504 0.116 <br />N02-N nd nd nd <br />NH3-N nd nd - 0.011 nd <br />TKN 0.283 0.170 - 0.647 0.153 <br />P04-P nd nd nd <br />Total P 0.011 nd - 0.036 0.013 <br />N03-N 0.302 0.091 - 0.482 0.125 <br />N02-N nd nd nd <br />NH3-N nd nd - 0.015 nd <br />TKN 0.246 0.167 - 0.518 0.116 <br />P04-P 0.003 nd - 0.021 0.007 <br />Total P 0.014 nd - 0.043 0.017 <br />N03-N 0.313 0.097 - 0.509 0.123 <br />N02-N nd nd nd <br />NH3-N nd nd nd <br />TKN 0.233 0.152 - 0.323 0.062 <br />P04-P 0.001 nd - 0.009 0.003 <br />Total P 0.003 nd - 0.027 0.010 <br />N03-N 0.306 0.097 - 0.428 0.105 <br />N02-N nd nd nd <br />NH3-N nd nd - 0.031 nd <br />TKN 0.216 0.155 - 0.336 0.062 <br />P04-P nd nd nd <br />Total P 0.009 nd - 0.036 0.016 <br />N03-N 0.317 0.000 - 0.504 0.123 <br />N02-N nd nd nd <br />NH3-N nd nd nd <br />TKN 0.218 0.136 - 0.285 0.047 <br />P04-P nd nd nd <br />Total P 0.011 nd - 0.033 0.014 <br />N03-N 0.313 0.111 - 0.432 0.104 <br />N02-N nd nd nd <br />NH3-N nd nd - 0.031 nd <br />TKN 0.233 0.145 - 0.377 0.074 <br />P04-P nd nd nd <br />Total P 0.010 nd - 0.036 0.015 <br />N03-N 0.342 0.136 - 0.430 0.094 <br />N02-N nd nd nd <br />NH3-N nd nd - 0.011 nd <br />TKN 0.233 0.168 - 0.334 0.057 <br />Ammonia nitrogen is included in the TKN fraction Yuma <br />along with organic nitrogen, although, at all stations, <br />in this system, ammonia concentrations were <br />generally undetected. Mean TKN concentrations, <br />mg/L, were (table 2): <br />- Davis Dam .................. 0.252 <br />- Parker Dam ................. 0.246 <br />- Palo Verde Diversion Dam ... 0.216 <br />- Imperial Dam ............... 0.233 <br />- Yuma ...................... 0.233 <br />t nd = not detected at listed detection limit; detection limits <br />are P04-P = 0.001 mg/L, Total P = 0.001 mg/L, <br />N03-N = 0.030 mg/L, N02-N = 0.001 mg/L, NH3-N = <br />0.010 mg/L, and TKN = 0.050 mg/L. <br />* Number of samples at all stations is 8.
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