About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in JEQ

  1. Vol. 25 No. 4, p. 828-836
     
    Received: July 17, 1995
    Published: July, 1996


    * Corresponding author(s):
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/jeq1996.00472425002500040026x

Modification of Snowmelt Chemistry by Forest Floor and Mineral Soil, Northern Michigan

  1. Robert Stottlemyer * and
  2. David Toczydlowski
  1. Nat. Biol. Serv., 240 W. Prospect Rd., Ft. Collins, CO 80526;
    Dep. of Biol. Sci., Michigan Technological Univ., Houghton, MI 49931.

Abstract

Abstract

Precipitation, snowpack, snowmelt, forest floor percolate, soil water, and streamwater chemistry were studied throughout winter for 7 yr in a small (176 ha) Northern Michigan watershed vegetated by northern hardwoods. The objective was to see how precipitation and snowmelt chemistry is modified before it reaches the stream. Intermittent snowmelt occurred throughout winter, and 65 to 78% of total snowpack loss of H+, NH+4, NO3, and SO2−4 occurred before peak snowpack and snowmelt. From 70 to 95% of snowmelt H+, NH6+4, and NO3 was retained in the forest floor and shallow mineral soil by exchange, adsorption, or biological uptake. Snowmelt SO2−4 concentration was enriched in forest floor percolate and shallow soil water probably by organic mineralization, low adsorption, and perhaps desorption. The significant relationship between dissolved organic carbon (DOC) and SO2−4 concentration in forest floor percolate and shallow soil water indicates organics may contribute to reduced SO2−4 adsorption. Sulfate and organic anions were major contributors to base cation (CB) flux in the forest floor while SO2−4 was related to CB flux in shallow soils. A decline in mineral soil and streamwater DOC concentration and increase in streamwater HCO3 relative to concentrations in forest floor percolate suggests the relative importance of organic decomposition decreased and soil mineral weathering increased with soil depth. High streamwater Ca2+, Mg2+, and HCO3 concentrations indicated that soil mineral weathering was a major process altering snowmelt chemistry at the watershed level.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .