Eutrophication and Land Use: Lake Dillon, Colorado - download pdf or read online

Environmental Studies

By William M. Lewis Jr., J. F. Saunders, D. W. Crumpacker, C. M. Brendecke

Nutrient enrichment (eutrophication) is a huge topic in freshwater ecology. a few subject matters come and cross, however the inevitable unencumber of phosphorus and nitrogen that ac­ businesses human presence turns out to make sure that eutrophication won't quickly develop into an superseded topic of analysis. Eutrophication increases concerns that variety from the pressingly sensible difficulties of phosphorus removing to the very primary ecological questions surrounding organic group law by means of source provide. even though it is feasible to take a reductionist method of a few facets of eutrophication, the examine of eutro­ phication is essentially a department of environment ecology. to appreciate eutrophication in a given atmosphere, one is necessarily compelled to think about actual, chemical, and organic phenomena jointly. hence whereas eutrophication is the focal point of our learn of Lake Dillon, we now have assumed extensive base of lirnnological info is a prerequisite starting place. Eutrophication of a lake could be studied strictly from a lirnnological viewpoint. if this is the case, the nutrient source of revenue of the lake is quantified however the resources are mixed inside a black field whose merely very important function is overall loading. it's also attainable, in spite of the fact that, to regard the watershed and lake as both vital elements of a hybrid method. for this reason the nutrient assets has to be dissected and their variability and dependence on key elements similar to runoff has to be quantified.

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Extra resources for Eutrophication and Land Use: Lake Dillon, Colorado

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I» E z· I0. W 30 0 40 J J A S J J A 1981 S 1982 Figure 19. Calculated inflow depth of the Snake River (S) , Blue River (B), and Ten· mile Creek (T) during stratification in 1981 and 1982. In 1981 the penetration began at about 10 m, just below the thermocline, and in· creased to about 25 m by late stratification (due mainly to warming of the lakewater). In 1982, penetration was not so deep; it began at about 5 m ,and slowly passed down to about 15 m. The larger flow of cold water to the metalimnion and continual heat Ice 8 Z 0.

The average SRP values were very low in both years and showed virtually no trend with depth. The averages for 1982 were slightly higher, however. This is explained mainly by the greater flow of water into the lake in 1982, as described more fully below in connection with seasonal trends. Soluble organic P was similar to SRP in showing no real trend with depth in the averages and in the slightly higher average for 1982. Particulate P, in contrast, was essentially the same the 2 years and showed a slight tendency toward higher values near the surface both years, probably due to the ability of phytoplankton, which are located mostly near the surface, to sequester phosphorus.

Table 19 summarizes the results of a two-way ANOYA similar to the one that was carried out on the phosphorus data. The ANOYA confirms statistically the difference between years in concentration of soluble organic nitrogen and total nitrogen. The difference between years in nitrate was not significant because it appeared only in deep water rather than over the entire water column. The ANOYA-confirms statistically the differences in mean nitrate concentration with depth. Figure 24 shows the seasonal changes in concentration of all nitrogen fractions at the surface of the lake.

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