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Dentrification potential of different landuse types in an agricultural watershed, lower Mississippi valley.

Ullah, Sami and Faulkner, Stephen (2006) Dentrification potential of different landuse types in an agricultural watershed, lower Mississippi valley. Ecological Engineering, 28 (2). pp. 131-140. ISSN 0925-8574

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      Abstract

      Expansion of agricultural land and excessive nitrogen (N) fertilizer use in the Mississippi River watershed has resulted in a three-fold increase in the nitrate load of the river since the early 1950s. One way to reduce this nitrate load is to restore wetlands at suitable locations between croplands and receiving waters to remove run-off nitrate through previous termdenitrification.next term This research investigated previous termdenitrificationnext term potential (DP) of different land uses and its controlling factors in an agricultural watershed in the lower Mississippi valley (previous termLMV)next term to help identify sites with high DP for reducing run-off nitrate. Soil samples collected from seven land-use types of an agricultural watershed during spring, summer, fall and winter were incubated in the laboratory for DP determination. Low-elevation clay soils in wetlands exhibited 6.3 and 2.5 times greater DP compared to high-elevation silt loam and low-elevation clay soils in croplands, respectively. DP of vegetated-ditches was 1.3 and 4.2 times that of un-vegetated ditches and cultivated soils, respectively. Soil carbon and nitrogen availability, bulk density, and soil moisture significantly affected DP. These factors were significantly influenced in turn by landscape position and land-use type of the watershed. It is evident from these results that low-elevation, fine-textured soils under natural wetlands are the best locations for mediating nitrate loss from agricultural watersheds in the previous termLMV.next term Landscape position and land-use types can be used as indices for the assessment/modeling of previous termdenitrificationnext term potential and identification of sites for restoration for nitrate removal in agricultural watersheds.

      Item Type: Article
      Journal or Publication Title: Ecological Engineering
      Additional Information: The final, definitive version of this article has been published in the Journal, Ecological Engineering, 28 (2), 2006, © ELSEVIER.
      Uncontrolled Keywords: Bottomland hardwoods ; Denitrification ; Forested wetlands ; NO3 pollution control ; Wetlands restoration
      Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
      Departments: Faculty of Science and Technology > Lancaster Environment Centre
      ID Code: 31470
      Deposited By: Dr. Sami Ullah
      Deposited On: 19 Jan 2010 15:02
      Refereed?: Yes
      Published?: Published
      Last Modified: 26 Jul 2012 16:58
      Identification Number:
      URI: http://eprints.lancs.ac.uk/id/eprint/31470

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