. 2007 Nov 13;41(3):367–377. doi: 10.1007/s00267-007-9033-y

Table 2.

Partial correlations among nutrient concentrations and riparian land cover classifications

Water chemistry parameter	Catchment land cover	Riparian land cover	r	p-value
Watershed
TN	Grass, forest	Grass, urban	Grass = −0.06	0.687
TN	Grass, forest	Grass, urban	Urban = 0.20	0.134
NO⁻₃	Crop, urban	Crop, urban	Crop = 0.22	0.071
NO⁻₃	Crop, urban	Crop, urban	Urban = 0.48	0.000
NH⁺₄	Grass, forest	Grass, forest	Grass = −0.03	0.803
NH⁺₄	Grass, forest	Grass, forest	Wood = −0.11	0.370
TP	Crop, urban, forest	Crop, urban	Crop = 0.04	0.779
TP	Crop, urban, forest	Crop, urban	Urban = 0.58	0.000
First order
TN	Crop, grass	Crop, urban	Crop = 0.25	0.068
TN	Crop, grass	Crop, urban	Urban = 0.33	0.013
NO⁻₃	Crop, urban	Crop, urban	Crop = 0.26	0.033
NO⁻₃	Crop, urban	Crop, urban	Urban = 0.50	0.000
NH⁺₄	Grass, forest	Grass, forest	Grass = −0.00	0.994
NH⁺₄	Grass, forest	Grass, forest	Forest = −0.08	0.543
TP	Crop, urban	Crop, urban	Crop = 0.04	0.724
TP	Crop, urban	Crop, urban	Urban = 0.68	0.000

Note. Correlations controlled for catchment land cover classifications that were significant predictors in regression models and were used to partition additional variance explained by riparian land cover from variance explained by catchment land cover. Partial correlations (r) for which riparian crop land (crop), forest, grassland (grass), and urban land (urban) explained >30% of the variation in water chemistry parameters among sites (see Table 1 and Fig. 3) are presented