HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Clausen, J. C. Articles by Johnson, G. D. Search for Related Content PubMed Articles by Clausen, J. C. Articles by Johnson, G. D. Agricola Articles by Clausen, J. C. Articles by Johnson, G. D.

Lake Level Influences on Sediment and Nutrient Retention in a Lakeside Wetland

School of Nat. Resourc., Aiken Center, Univ. of Vermont, Burlington, VT 05405;

G. D. Johnson

Minn. Pollut. Control Agency, St. Paul, MN 55155;

^* Corresponding author.

ABSTRACT

Lake levels, sediment and nutrient retention, and flows were studied in a 180-ha wetland adjacent to Lake Champlain, VT, to assess the role of lake levels on sediment and nutrient retention within the wetland. This wetland received both point and nonpoint sources of nutrients. Input, output, and within-wetland water samples were collected at 15 sites, and flows were measured nine times in 1983 at lake levels varying over 2 m. The ratio of wetland inflow to outflow was related to changes in lake levels. During spring, the concentrations of total suspended solids, total P, and total Kjeldahl N throughout the wetland were lower than during summer and fall periods. Wetland outlet concentrations decreased with rising lake levels. When wetland inflows exceeded outflow, there was a net mass retention of total suspended solids, total P, and total Kjeldahl N. Exports from the wetland decreased as lake level increased. The sediment and nutrient treatment capacity of this lakeside wetland appeared to be dominated by hydrologic influences.

Contribution from the School of Natural Resources, Univ. of Vermont.

Funding provided by USDA-ASCS and SCS.

Received for publication July 11, 1988.