Effects of Nitrogen on Temporal and Spatial Patterns of Nitrate in Streams and Soil Solution of a Central Hardwood Forest
Figure 2
Mean annual stream water for WS3 (treatment: solid symbols) and WS4 (control: open symbols) at Fernow Experimental Forest, West Virginia. Arrow indicates initiation of N treatments on WS3. Horizontal dashed lines represent thresholds based on The State of the Nationβs Ecosystems (see text). Heavy dashed line represents correlation between mean annual stream water and time from 1981 to 2004 for WS4 (, ); solid line represents relationship from 1998 to 2004 for WS3 (, ).