Assessing the Impacts of Future Climate Conditions on the Effectiveness of Winter Cover Crops in Reducing Nitrate Loads into the Chesapeake Bay Watersheds Using the SWAT Model

Lee, Sangchul; Sadeghi, Ali; Yeo, In‐Young; McCarty, Gregory W.; Hively, W. Dean

doi:10.13031/trans.12390

Cited by 13 publications

(13 citation statements)

References 38 publications

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“…Muenich et al (2017) used SWAT to assess BMPs for improving runoff quality in a basin draining into Lake Erie. Other studies (e.g., Lee et al, 2017, discussed below) focused on the drainage areas of other lakes in the Great Lakes system, as well as Chesapeake Bay and other locations across the U.S. The lack of consistency between upstream BMP implementation and downstream water quality results is currently the primary roadblock to widespread PFP implementation.…”

Section: Watershed Technology Tools and Techniques For Sustainabilitymentioning

confidence: 99%

“…The 2014 Watershed Technology Conference (Tollner and DouglasMankin, 2016) highlighted similar work in New Zealand, where the concept is now used to determine practices that farmers and ranchers may employ on their land. Lee et al (2017) examined a specific BMP in detail, i.e., the use of winter cover crops in reducing nitrate loads in Chesapeake Bay. They suggested that climate change may exacerbate the degradation of water quality in Chesapeake Bay.…”

Section: Watershed Technology Tools and Techniques For Sustainabilitymentioning

confidence: 99%

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International Watershed Technology: Improving Water Quality and Quantity at the Local, Basin, and Regional Scales

Tollner¹,

Douglas-Mankin²

2017

Transactions of the ASABE

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ABSTRACT. This article introduces the five papers in the "atershed science and engineering have advanced rapidly in recent decades with the development and application of expanded knowledge and cutting-edge technologies in environmental monitoring, geospatial data processing, modeling, and analysis. While these approaches have solved many critical problems, many more challenges remain.Advances in international watershed technology have been summarized in two recent American Society of Agricultural and Biological Engineers (ASABE) special collections Douglas-Mankin, 2013, 2016) that resulted from the third and fourth in a series of international conferences on the topic. Efforts to increase exchange of the latest international research and technology related to sustainable watershed resource management continued with the fifth biennial ASABE 21st Century Watershed Technology Conference and Workshop: Improving Water Quality and the Environment. The conference received broad sponsorship from ASABE; the Texas Institute for Applied Environmental Research (TiAER) at Tarleton State University; Universidad Regional Amazonica (IKIAM), Quito, Ecuador; Secretary of Education, Office of Science, Technology, and Innovation (SENESCYT), Quito, Ecuador; the University of Florida; and the USDA-ARS. Professionals working in watershed technology and related areas met in Quito, Ecuador, on 3-9 December 2016 to exchange information on science, applications, and developments in watershed science and technology. The meeting papers are available in the ASABE Technical Library (http://elibrary.asabe.org) and may be located with a search of the conference papers.The presentations included a breadth of quality work relating to applications of agricultural and biological engineering in developing and developed countries to solve practical problems. Five papers from the conference were selected for inclusion in this collection as exemplary contributions to advancing watershed technology and science. This introductory article introduces and summarizes these papers.

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Section: Watershed Technology Tools and Techniques For Sustainabilitymentioning

confidence: 99%

Section: Watershed Technology Tools and Techniques For Sustainabilitymentioning

confidence: 99%

International Watershed Technology: Improving Water Quality and Quantity at the Local, Basin, and Regional Scales

Tollner¹,

Douglas-Mankin²

2017

Transactions of the ASABE

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“…However, the study did not report the effect of cover crop on cash crop production under climate change and conditions within the Chesapeake Bay Watershed are considerably different from conditions in the northern Mississippi River Basin [37]. Mehan et al [38] used the SWAT model to estimate that N loads were reduced under climate change compared to baseline conditions in a predominately subsurface drained agricultural watershed in northeastern Indiana, which contrasted with the results of other studies [16,37]. Missing in the studies of Lee and Mehan [37,38] were the complete N budget including mineralization and uptake by crops under projected climate change.…”

Section: Introductionmentioning

confidence: 98%

“…While few, if any, studies have investigated both corn-soybean production and N loss to subsurface drainage with winter rye cover crops under climate change in the Mississippi River Basin, the SWAT model has been used to investigate the effectiveness of winter rye cover crop in reducing N loads to streams within the Chesapeake Bay Watershed under climate change [37].This study [37] also reported that without winter cover crops, annual nitrate loads increased under climate change compared with baseline climate. However, the study did not report the effect of cover crop on cash crop production under climate change and conditions within the Chesapeake Bay Watershed are considerably different from conditions in the northern Mississippi River Basin [37]. Mehan et al [38] used the SWAT model to estimate that N loads were reduced under climate change compared to baseline conditions in a predominately subsurface drained agricultural watershed in northeastern Indiana, which contrasted with the results of other studies [16,37].…”

Section: Introductionmentioning

confidence: 99%

“…RZWQM has also been used to investigate both crop production and drainage N loads under climate change [16]. RZWQM may simulate N dynamics more realistically than the SWAT simulations mentioned above [37,38]. Malone et al [42] reported that RZWQM simulates N dynamics in corn-soybean rotations differently and perhaps more accurately than the SWAT model because of more mechanistic soil N mineralization and microbial immobilization routines.…”

Section: Introductionmentioning

confidence: 99%

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Drainage N Loads Under Climate Change with Winter Rye Cover Crop in a Northern Mississippi River Basin Corn-Soybean Rotation

et al. 2020

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To help reduce future N loads entering the Gulf of Mexico from the Mississippi River 45%, Iowa set the goal of reducing non-point source N loads 41%. Studies show that implementing winter rye cover crops into agricultural systems reduces N loads from subsurface drainage, but its effectiveness in the Mississippi River Basin under expected climate change is uncertain. We used the field-tested Root Zone Water Quality Model (RZWQM) to estimate drainage N loads, crop yield, and rye growth in central Iowa corn-soybean rotations. RZWQM scenarios included baseline (BL) observed weather (1991–2011) and ambient CO2 with cover crop and no cover crop treatments (BL_CC and BL_NCC). Scenarios also included projected future temperature and precipitation change (2065–2085) from six general circulation models (GCMs) and elevated CO2 with cover crop and no cover crop treatments (CC and NCC). Average annual drainage N loads under NCC, BL_NCC, CC and BL_CC were 63.6, 47.5, 17.0, and 18.9 kg N ha−1. Winter rye cover crop was more effective at reducing drainage N losses under climate change than under baseline conditions (73 and 60% for future and baseline climate), mostly because the projected temperatures and atmospheric CO2 resulted in greater rye growth and crop N uptake. Annual CC drainage N loads were reduced compared with BL_NCC more than the targeted 41% for 18 to 20 years of the 21-year simulation, depending on the GCM. Under projected climate change, average annual simulated crop yield differences between scenarios with and without winter rye were approximately 0.1 Mg ha−1. These results suggest that implementing winter rye cover crop in a corn-soybean rotation effectively addresses the goal of drainage N load reduction under climate change in a northern Mississippi River Basin agricultural system without affecting cash crop production.

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Integrating terrestrial and aquatic processes toward watershed scale modeling of dissolved organic carbon fluxes

Du¹,

Mukundan²,

Hoang

et al. 2019

Environmental Pollution

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Assessing the Impacts of Future Climate Conditions on the Effectiveness of Winter Cover Crops in Reducing Nitrate Loads into the Chesapeake Bay Watersheds Using the SWAT Model

Abstract: ABSTRACT. Winter cover crops (WCCs) have been widely implemented in the Coastal Plain of the Chesapeake Bay Watershed (CBW)

Cited by 13 publications

References 38 publications

International Watershed Technology: Improving Water Quality and Quantity at the Local, Basin, and Regional Scales

International Watershed Technology: Improving Water Quality and Quantity at the Local, Basin, and Regional Scales

Drainage N Loads Under Climate Change with Winter Rye Cover Crop in a Northern Mississippi River Basin Corn-Soybean Rotation

Integrating terrestrial and aquatic processes toward watershed scale modeling of dissolved organic carbon fluxes

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