Title

Optimal Control Of Harvesting In A Stochastic Metapopulation Model

Abstract

Substantially different biogeochemical processes affecting nitrogen fate and transport were observed beneath two stormwater infiltration basins in north-central Florida. Differences are related to soil textural properties that deeply link hydroclimatic conditions with soil moisture variations in a humid, subtropical climate. During 2008, shallow groundwater beneath the basin with predominantly clayey soils (median, 41% silt+clay) exhibited decreases in dissolved oxygen from 3.8 to 0.1 mg L -1 and decreases in nitrate nitrogen (NO 3--N) from 2.7 mg L -1 to <0.016 mg L -1, followed by manganese and iron reduction, sulfate reduction, and methanogenesis. In contrast, beneath the basin with predominantly sandy soils (median, 2% silt+clay), aerobic conditions persisted from 2007 through 2009 (dissolved oxygen, 5.0-7.8 mg L -1), resulting in NO 3--N of 1.3 to 3.3 mg L -1 in shallow groundwater. Enrichment of δ 15N and δ 18O of NO 3- combined with water chemistry data indicates denitrification beneath the clayey basin and relatively conservative NO 3- transport beneath the sandy basin. Soil-extractable NO 3--N was significantly lower and the copper-containing nitrite reductase gene density was significantly higher beneath the clayey basin. Differences in moisture retention capacity between fine- and coarse-textured soils resulted in median volumetric gas-phase contents of 0.04 beneath the clayey basin and 0.19 beneath the sandy basin, inhibiting surface/subsurface oxygen exchange beneath the clayey basin. Results can inform development of soil amendments to maintain elevated moisture content in shallow soils of stormwater infiltration basins, which can be incorporated in improved best management practices to mitigate NO 3- impacts. © 2012 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.

Publication Date

3-1-2012

Publication Title

Optimal Control Applications and Methods

Volume

33

Issue

2

Number of Pages

127-142

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1002/oca.977

Socpus ID

84858665771 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84858665771

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