3.3. Spatial in-stream inorganic nutrients and TSS modeling
SAR analysis showed the significant spatial relationships between arable land and water quality indicators, particularly N-NO3- and TSS, for the Mszanka surface waters. For the Smugawka surface waters, a significant spatial relationship was revealed between arable land and the P-PO43- concentrations (Table 4). A significant spatial relationship was observed between permanent grasslands and the P-PO43- and TSS concentrations in Mszanka, whereas only the concentration of N-NH4+ was associated with grasslands in Smugawka (Table 5). The forested part of the catchment areas showed significant spatial relationships between the N-NO3- concentration and the Mszanka surface water, but there were no significant relationships between the forested region and water indicators of the Smugawka stream (Table 6).
Table 4 A spatial autoregression model for nutrient concentration and TSS in watercourses flowing through arable land.