Environmental Management

, Volume 45, Issue 2, pp 336–350

Influences of Spatial Scale and Soil Permeability on Relationships Between Land Cover and Baseflow Stream Nutrient Concentrations

  • F. Bernard Daniel
  • Michael B. Griffith
  • Michael E. Troyer
Article

DOI: 10.1007/s00267-009-9401-x

Cite this article as:
Daniel, F.B., Griffith, M.B. & Troyer, M.E. Environmental Management (2010) 45: 336. doi:10.1007/s00267-009-9401-x

Abstract

The Little Miami River (LMR) basin, dominated by agriculture, contains two geologically-distinct regions; a glaciated northern till plain with soils three times more permeable than a southern, pre-Wisconsinan drift plain. The influences of two landscape measures, percent row crop cover (%RCC, computed at three spatial scales), and soil permeability (PERM), on baseflow nutrient concentrations were modeled using linear regressions. Quarterly water samples collected for four years were analyzed for nitrate-N (NN), Kjeldahl-N (KN), total-N (TN), and total-P (TP). In till plain streams (n = 17), NN concentrations were 8.5-times greater than drift plain streams (n = 18), but KN and TP were 20–40% lower at comparable %RCC. These differences resulted in TN/TP molar ratios >80 in till plain streams, but <6 in drift plain streams. For till plain steams regression models based on %RCC accounted for 79% of the variance in NN concentrations but only 27% in drift plain streams. However, regressions on %RCC accounted for 68–75% of the KN and TP concentration variance in the drift plain streams but essentially none in the till plain. Catchment PERM influenced the regional NN/KN ratios which were 10-fold higher in the drift plain streams. For both till and drift streams the catchment scale %RCC gave the best predictions of NN, a water soluble anion, but the smaller spatial scales produced better models for insoluble nutrient species (e.g., KN and TP). Published literature on Ohio streams indicates that these inter-regional differences in nutrient ratios have potential implications for aquatic biota in the receiving streams.

Keywords

Land cover Row crop Spatial scale Non-point source Nutrients Soil permeability Water quality Aquatic biotic integrity 

Copyright information

© U.S. Government 2009

Authors and Affiliations

  • F. Bernard Daniel
    • 1
  • Michael B. Griffith
    • 2
  • Michael E. Troyer
    • 2
  1. 1.National Exposure Research Laboratory, Office of Research and DevelopmentU.S. Environmental Protection AgencyCincinnatiUSA
  2. 2.National Center for Environmental Assessment, Office of Research and DevelopmentU.S. Environmental Protection AgencyCincinnatiUSA

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