Table 1 Covariates of total nitrogen (TN) included in the study and their correlation with log (TN) within all streams
Variable | Description | Units | r |
|---|---|---|---|
ELEV | Elevation | m | − 0.18 |
Longitude | Longitude | Degree | 0.57 |
Log(PRECIP) | Annual precipitation in log scale | mm | − 0.58 |
Log(AREA) | Catchment area in log scale | km2 | 0.47 |
Log(CL) | Cl− concentration in log scale | μg/L | 0.62 |
Log(HCO3) | HCO3− concentration in log scale | μg/L | 0.55 |
Log(SO4) | SO4−2 concentration in log scale | μg/L | 0.61 |
SED | Sand and fine substrate in the stream (< 2 mm in diameter) | μg/L | 0.63 |
STRMTEMP | Stream temperature | Degree | 0.49 |
Percent.AGT | Percentage of catchment in agricultural land use | μg/L | 0.57 |
Percent.URB | Percentage of catchment in urban land | Percentage | 0.30 |
Percent.Canopy | Percentage of open canopy | Percentage | 0.47 |
Riparian.Disturb | Riparian agricultural disturbance index | Index | 0.49 |