
TY  - JOUR
A1  - Hauer, FR 
A1  - Spencer, CN 
T1  - Phosphorus and Nitrogen Dynamics in Streams Associated With Wildfire: a Study of Immediate and Longterm Effects
JF  - International Journal of Wildland Fire
JO  - Int. J. Wildland Fire
Y1  - 1998
VL  - 8
IS  - 4
SP  - 183
EP  - 198
KW  - Rocky Mountains; wildfire; streams; nutrients; phosphorus; nitrogen; water chemistry
UR  - https://doi.org/10.1071/WF9980183 
N2  - Stream nutrient data were collected both during a wildfire and over a subsequent five-year period. Sampling was from a series of paired watersheds located within and outside of the wildfire. Phosphorus and nitrogen concentrations increased from 5 to 60 fold over background levels during the first few days of the month-long wildfire with maximum recorded concentrations as high as 135 &#956;g/L soluble reactive phosphorus, 261 &#956;g/L ammonium, and 61 &#956;g/L nitrate. Total phosphorus and total nitrogen during this same time period increased up to 206 &#956;g/L and 349 m&#956;g/L, respectively. Nutrient concentrations declined to background levels (<5-10 &#956;g/L) within a few weeks after the fire. Over the following five years we observed dissolved nutrient concentrations reaching >40 &#956;g/L soluble reactive phosphorus and >125 &#956;g/L nitrate in impacted streams, concentrations >5 fold over those observed in control streams. In high gradient watersheds, all nutrients were easily transported to the streams with most notable impact during the early years after the fire. In less steep terrain, soluble reactive phosphorus concentrations were significantly higher 3 to 5 years after the fire, which also corresponded to relatively high spring hydrographs. In contrast, nitrogen compounds were observed to be significantly higher in concentration in fire impact streams in the years immediately following the fire. We attribute these differences in the rate of nutrient loads to be the result of the different mobilization mechanisms of phosphorus and nitrogen and the different soil and geomorphic settings of the watersheds drained by the different streams. 
ER  -

