*3.3.3 Analysis by land use*

To assess the variability of ammonium atmospheric deposition fluxes by land use, sampling sites were grouped according to the prevailing land use as follows:

Industrial land use: Sites I, II, III, IV, V.

Urban land use: Sites VI, VII, VIII, IX, X.

In the case of sites grouped with an urban land use, the mean value obtained was 3.97 Kg Ha<sup>−</sup><sup>1</sup> year<sup>−</sup><sup>1</sup> , with a maximum of 14.04 Kg Ha<sup>−</sup><sup>1</sup> year<sup>−</sup><sup>1</sup> . Regarding extreme values, the highest values were found in site VI (Zoológico at NE), whereas in the case of sites grouped with an industrial land use, the mean value obtained was 4.45 Kg Ha<sup>−</sup><sup>1</sup> year<sup>−</sup><sup>1</sup> , with a maximum of 15.78 Kg Ha<sup>−</sup><sup>1</sup> year<sup>−</sup><sup>1</sup> . The highest mean value was registered in site IV (Instituto Tecnológico de León at SE) (**Figure 10**). From **Figure 10**, it can be observed that the mean ammonium deposition flux did not

**55**

**Figure 10.**

**Figure 9.**

*Mapping and Estimation of Nitrogen and Sulfur Atmospheric Deposition Fluxes…*

show any variability or trend with respect to land use; however, the extreme values were higher in those sites with an industrial land use; however, when Friedman test

was applied, any significant difference was found.

*Ammonium atmospheric deposition fluxes by land use.*

*DOI: http://dx.doi.org/10.5772/intechopen.90878*

*Ammonium atmospheric deposition fluxes by site.*

*Mapping and Estimation of Nitrogen and Sulfur Atmospheric Deposition Fluxes… DOI: http://dx.doi.org/10.5772/intechopen.90878*

**Figure 9.** *Ammonium atmospheric deposition fluxes by site.*

*Spatial Variability in Environmental Science - Patterns, Processes, and Analyses*

occurring during this season in comparison with the other two seasons of the year. Second, the temporality of sources could be important, since the use of agrochemicals can be intensive during the cold dry season, resulting in levels considerably high during this season. This was demonstrated applying Friedman test, whose

To assess the spatial variability and their distribution, ammonium deposition

To assess the variability of ammonium atmospheric deposition fluxes by land use, sampling sites were grouped according to the prevailing land use as follows:

In the case of sites grouped with an urban land use, the mean value obtained was

values, the highest values were found in site VI (Zoológico at NE), whereas in the case of sites grouped with an industrial land use, the mean value obtained was 4.45

was registered in site IV (Instituto Tecnológico de León at SE) (**Figure 10**). From **Figure 10**, it can be observed that the mean ammonium deposition flux did not

year<sup>−</sup><sup>1</sup>

year<sup>−</sup><sup>1</sup>

. Regarding extreme

. The highest mean value

, with a maximum of 14.04 Kg Ha<sup>−</sup><sup>1</sup>

, with a maximum of 15.78 Kg Ha<sup>−</sup><sup>1</sup>

 year<sup>−</sup><sup>1</sup> ,

fluxes were analyzed by sampling site, finding a mean value of 4.29 Kg Ha<sup>−</sup><sup>1</sup>

with the highest value registered in site X (Loma Blanca at SW) (**Figure 9**). However, applying Friedman test, it was concluded that there were not significant differences between sampling sites. It suggests that the differences found could be attributed only to sampling season as a result of agricultural activities and the effect

results confirmed that differences between seasons were significant.

*3.3.2 Spatial variability*

*Ammonium atmospheric deposition fluxes by season.*

**Figure 8.**

of atmospheric dilution.

*3.3.3 Analysis by land use*

year<sup>−</sup><sup>1</sup>

year<sup>−</sup><sup>1</sup>

3.97 Kg Ha<sup>−</sup><sup>1</sup>

Kg Ha<sup>−</sup><sup>1</sup>

Industrial land use: Sites I, II, III, IV, V. Urban land use: Sites VI, VII, VIII, IX, X.

**54**

**Figure 10.** *Ammonium atmospheric deposition fluxes by land use.*

show any variability or trend with respect to land use; however, the extreme values were higher in those sites with an industrial land use; however, when Friedman test was applied, any significant difference was found.
