Koontz, J., D.G. Huggins, C.C. Freeman, D.S. Baker - Central Plains ...

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nitrogen in the reference sites is greater than in the random sites, indicating higher microbial productivity. Wetlands that have well established, diverse microbial communities are considered to be high quality, functional ecosystems that play a significant role in attenuation of the floodplain nutrients, especially in areas with agricultural runoff. No significant differences and no interactions were found among ecoregions, classes, or types when multiple factor ANOVA‟s were used to examine those nitrogen measures that significantly differed among the sample populations. Some indication of difference (Kruskal-Wallace p = 0.009) in mean total nitrogen concentrations among the types was found when only the samples from the random population were examined (Figure 26c). Aquatic bed types had significantly lower mean total nitrogen (0.83 mg/L) than emergent macrophyte beds (1.43 mg/L). Organic nitrogen significantly differed between populations (ANOVA and Tukey-Kramer multiple comparison test, p ≤ 0.05). Within the random population, the MIX and UB types had similar mean total nitrogen values, 0.92 and 0.99 mg/L respectively. Though no interactions were identified, total nitrogen levels within both populations appeared to be influenced by the distribution and number of wetland types in each grouping (multiple factor ANOVA). More than half the reference population was composed of EM sites (9); the rest of the sites being one AB, four MIX, and three UB. In the random population, fewer than half the sites were EM (16), while there were three MIX, eight AB, and 11 UB types. Group composition by type becomes more significant when considering conductivity and its relationship to percent adventives and mean conservatism, and the distribution of these types along the floodplain corridor. Emergent bed types have the capacity to cycle and store larger amounts of nitrogen (e.g. Moshiri 1993). Shallow water depths allow for the establishment of dense stands of macrophytes that senesce and contribute large amounts of detritus to the wetland sediment and water column. Increased evapotranspiration along with the substantial biomass accumulation associated with these persistent species contribute significantly to EM type and its significant numbers among the sample population. Though many wetland managers attempt to control these dominant plants in hopes to provide more open water areas for waterfowl and obligate aquatic flora, the EM type does represent a large population of sites along the Missouri River that functionally can provide significantly to the cycling and retention of nutrients. 42 of 84
Nitrate:Ammonia Ratio Phase II Total Nitrogen mg-N/L 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 a b 1 2 Study Phase c AB EM MIX UB Wetland Type Figure 26. Error bar plots of (a) nitrate to ammonia ratio and total nitrogen concentrations (mg N/L) (b) in reference and random populations and by (c) wetland type. Error bar plots are one standard error. CDF 100 90 80 70 60 50 40 30 20 10 0 Total Nitrogen mg-N/L 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 Figure 27. Cumulative distribution frequency (CDF) of total nitrogen for reference (Phase I) and random (Phase II) populations. 43 of 84 1 2 Study Phase 0 1 2 3 4 Total N mg/L Phase One Phase Two
Page 1 and 2: Assessment of Floodplain Wetlands o
Page 3 and 4: Nitrogen ..........................
Page 5 and 6: Executive Summary This project soug
Page 7 and 8: other wetland parameters and assess
Page 9 and 10: quality of plant community, respect
Page 11 and 12: was inevitable, but care was taken
Page 13 and 14: Evidence that waterfowl and/or amph
Page 15 and 16: Floristic Quality Assessments Flori
Page 17 and 18: FQAI ALL 30 25 20 15 10 5 0 Figure
Page 19 and 20: MEAN CONSERVATISM ALL 6 5 4 3 2 1 0
Page 21 and 22: Mean Conductivity mS/cm 0.6 0.5 0.4
Page 23 and 24: Table 7). The wide range of values
Page 25 and 26: Nitrogen - N mg/L Total Nitrogen mg
Page 27 and 28: N:P ratio 30.0 24.0 18.0 12.0 6.0 0
Page 29 and 30: Chlorophyll a ug/L 200 180 160 140
Page 31 and 32: wetlands, respectively. Macroinvert
Page 33 and 34: from analysis did not show signific
Page 35 and 36: major wetland classes when ANOVA an
Page 37 and 38: measurement. There are sites within
Page 39 and 40: measurements, turbidity was conside
Page 41: TOC mg/L TOC mg/L 16 14 12 10 8 6 4
Page 45 and 46: CDF 100 90 80 70 60 50 40 30 20 10
Page 47 and 48: was true for organic nitrogen (R 2
Page 49 and 50: Figure 34. Error bar plots of mean
Page 51 and 52: and deethylatrazine were both prese
Page 53 and 54: suspected that differences in sampl
Page 55 and 56: Figure 38. Cumulative distribution
Page 57 and 58: Table 11. Metrics used in the devel
Page 59 and 60: tested: Percent Clingers (+) (p=0.0
Page 61 and 62: CDF Figure 42. Cumulative distribut
Page 63 and 64: Total Nitrogen mg/L Mean Conductivi
Page 65 and 66: Percent Hydroptilidae = 1.463766 +
Page 67 and 68: Table 14. Descriptive statistics fo
Page 69 and 70: MMI Scores 100 90 80 70 60 50 40 30
Page 71 and 72: ecoregions. Mean pH was also found
Page 73 and 74: MMI Scores UB Wetland Type MMI Scor
Page 75 and 76: Acknowledgements Field crew members
Page 77 and 78: Smith, L.M., N.H. Euliss, D.A. Wilc
Page 79 and 80: a. Land and soils coverage maps. b.
Page 81 and 82: Code Phase Longitude Latitude Site
Page 83 and 84: Appendix C. Laboratory measurements

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