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

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Phosphorus Orthophosphate was significantly higher (Kruskal-Wallace p = 0.036) in the random population (mean = 171.41 µg-P/L) than in the reference group (93.28 µg-P/L, Figure 28a). Total phosphorus did not differ between study populations, with mean group values being somewhat over 400 µg/L. Total phosphorus was significantly (negatively) related to mean depth, but little of the variance in this relationship was explained (R 2 = -0.07, p = 0.029). Orthophosphate was not significantly related to mean depth. Total phosphorus and organic phosphorus held similar robust linear regression relationships with maximum depth, with total phosphorus exhibiting a stronger relationship. Total phosphorus had significant (p < 0.000) positive linear relationships with both TOC (R 2 = 0.25) and DOC (R 2 = 0.35). The DOC fraction of TOC seems to be the largest contributor to organic carbon in these systems (Figure 28b). This indicates that adsorption processes are dominating the phosphorus speciation and location in the wetlands. This is further illustrated by the small but significant positive relationship between orthophosphate and DOC, and that no significant relationship was found for TOC. While total phosphorus was not significantly related to chlorophyll-a levels in the study wetlands, orthophosphate and chlorophyll-a were significantly correlated (R 2 = 0.36). The CDF curves for total phosphorus in the random and reference groups suggested that there is little difference in these groups based on phosphorus levels within the populations (Figure 29). a b Figure 28. Error bar plots of (a) phosphorus and (b) carbon measures from study Phases I and II. Error bars are standard error. 44 of 84
CDF 100 90 80 70 60 50 40 30 20 10 0 0 1000 2000 3000 4000 Total Phosphorus µg/L Figure 29. Cumulative distribution frequency (CDF) of total phosphorus for reference (Phase I) and random (Phase II) populations. TN:TP ratio The log mean ratio of total nitrogen to total phosphorus was higher (p = 0.012) in reference wetlands than in the random group due to the significantly higher total nitrogen values in the reference wetlands (Figure 30a). Mean TN:TP ratios for reference and random populations were 8.50 and 5.34, respectively. No significant differences were found among ecoregions, classes, or types for TN:TP. However, phosphorus had that most influence on the ratios. Robust linear regression indicated that total phosphorus explained 19% of the variation in TN:TP ratios while TN was not a significant independent variable (Figure 30c and d). Evaluating the study phases separately showed this relationship of total phosphorus to be substantially stronger within the reference population (R 2 = 0.4). 45 of 84 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 and 42: TOC mg/L TOC mg/L 16 14 12 10 8 6 4
Page 43: Nitrate:Ammonia Ratio Phase II Tota
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

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

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