Catchment 690 INDEX

Fig 4. Multiplicative Au Ag index for catchment outlet sediment samples after MMI extraction. 

In the Front Range of the Rocky Mountains, the N enrichment of alpine catchments from increased atmospheric N deposition from agricultural and urban development on the plains is an important environmental and resource issue (Williams et al., 1996). The difference in N content (about 0.5-1.0% for terrestrially derived DOM vs. about 2-3% for microbially derived DOM) could be significant in terms of estimating the contribution of dissolved fulvic acid flux to the yield of N from alpine and subalpine catchments in the Rocky Mountains. The example for this alpine catchment illustrates the potential usefulness of the fluorescence index in field studies addressing applied issues related to environmental management. 

Rusinek, O.T. et al. (eds.), Index of Animal Species Inhabiting Lake Baikal and its Catchment Area. Vol. 

Figure 9.14. Relationship between McKnight et al. (2001) fluorescence index (FI) (a, b) and freshness index (jS/0 ) (c, d) to characteristics of land cover and nutrients for 34 watersheds. FI correlated positively with % of continuous cropland in the riparian zone (a) and negatively with % wetland in the riparian zone (square root transformed) (b) whereas (j8/a) correlated positively with both % of continuous cropland (c) and log total dissolved nitrogen (TDN) (d). These results support the ability of fluorescence indices to respond to changes in catchment and stream characteristics. (Adapted from Wilson and Xenopoulos, 2009.)...

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