Modeling the impacts of soil management practices on runoff, sediment yield, maize productivity, and soil organic carbon using APEX

Wang, X.; Gassman, Philip W.; Williams, J. R.; Potter, Steven R.; Kemanian, Armen R.

doi:10.1016/j.still.2008.07.014

Cited by 55 publications

(29 citation statements)

References 34 publications

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“…Detailed models such as Century, EPIC, APEX, and SWAT can be used to simulate the effects of land management decisions on soil, water, nutrients and watersheds; however, these tools are data intensive and suffer from high model complexity [150][151][152]. The Integrated Valuation of Ecosystems Services and Tradeoffs (InVEST) modeling suite can be used to quantify and map a variety of regional ecosystems goods services as well as biodiversity for both terrestrial and marine environments including crop pollination, habitat quality, habitat risk assessment, managed timber production, managed fish aquaculture, marine water quality, sediment retention, water purification, carbon sequestration, and others [153].…”

Section: Ecosystems Scalementioning

confidence: 99%

Design of Sustainable Biofuel Processes and Supply Chains: Challenges and Opportunities

et al. 2015

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Abstract:The current methodological approach for developing sustainable biofuel processes and supply chains is flawed. Life cycle principles are often retrospectively incorporated in the design phase resulting in incremental environmental improvement rather than selection of fuel pathways that minimize environmental impacts across the life cycle. Further, designing sustainable biofuel supply chains requires joint consideration of economic, environmental, and social factors that span multiple spatial and temporal scales. However, traditional life cycle assessment (LCA) ignores economic aspects and the role of ecological goods and services in supply chains, and hence is limited in its ability for guiding decisionmaking among alternatives-often resulting in sub-optimal solutions. Simultaneously incorporating economic and environment objectives in the design and optimization of emerging biofuel supply chains requires a radical new paradigm. This work discusses key research opportunities and challenges in the design of emerging biofuel supply chains and provides a high-level overview of the current "state of the art" in environmental sustainability assessment of biofuel production. Additionally, a bibliometric analysis of over 20,000 biofuel research articles from 2000-to-present is performed to identify active topical areas of research in the biofuel literature, quantify the relative strength of connections between various biofuels research domains, and determine any potential research gaps. OPEN ACCESSProcesses 2015, 3 635

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Section: Ecosystems Scalementioning

confidence: 99%

Design of Sustainable Biofuel Processes and Supply Chains: Challenges and Opportunities

et al. 2015

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“…23 A long-term study at a USDA research station in Iowa demonstrated that ridge tillage increased corn yields by nearly 4% over conventional tillage. 24 Ridge tillage is an economically viable alternative to conventional tillage, as it can reduce fuel, labor, and equipment costs. 25,26 Another similarly targeted technique is banded fertilizer placement.…”

Section: Ackerman Et Al Would Banning Atrazine Benefit Farmers?mentioning

confidence: 99%

Would banning atrazine benefit farmers?

Ackerman

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Knight

2014

International Journal of Occupational and Environmental Health

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“…Models can provide long-term simulations of various combinations of cropping systems and conservation practices, effects of best management practices, and assist in selection of appropriate conservation approaches for improved environmental benefits (Wang et al 2008). Models calibrated and validated with measured runoff, sediment and nutrient losses from watersheds have been used to assist policy makers in selecting conservation practices and allocating resources (Singh and Frevert 2006).…”

Section: Introductionmentioning

confidence: 99%

“…This model was developed in the 1990s to address environmental problems associated with livestock and other agricultural production systems on a field-scale, on the whole farm-scale, or on small watersheds (Gassman et al 2005). The model was developed from several existing and well tested models (Wang et al 2008). A few examples from where the APEX model components are derived, as reported by Wang et al (2008), include: (i) the soil carbon cycling submodel taken from the Century model (Parton et al 1993;Parton et al 1994) as developed by Izaurralde et al (2006), (ii) the pesticide component submodel was derived from the Groundwater Loading Effects of Agricultural Management Systems (GLEAMS; Leonard et al 1987), and (iii) the plant competition component was derived from the ALMANAC model (Kiniry et al 1992).…”

Section: Introductionmentioning

confidence: 99%

“…The model was developed from several existing and well tested models (Wang et al 2008). A few examples from where the APEX model components are derived, as reported by Wang et al (2008), include: (i) the soil carbon cycling submodel taken from the Century model (Parton et al 1993;Parton et al 1994) as developed by Izaurralde et al (2006), (ii) the pesticide component submodel was derived from the Groundwater Loading Effects of Agricultural Management Systems (GLEAMS; Leonard et al 1987), and (iii) the plant competition component was derived from the ALMANAC model (Kiniry et al 1992). Harman et al (2004) reported that the APEX model simulates various combinations of cropping and management practices and their environmental effects on a whole farm basis, which is a larger scale of simulation compared to the EPIC model.…”

Section: Introductionmentioning

confidence: 99%

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APEX model simulation of runoff and sediment losses for grazed pasture watersheds with agroforestry buffers

et al. 2010

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Buffers have been found to reduce nonpoint source pollution (NPSP) from watersheds. Hydrologic simulation models assist in predicting the effects of buffers on runoff and sediment losses from small watersheds. The objective of this study was to calibrate, validate and simulate runoff and sediment losses and compare buffer effects on NPSP losses relative to control watersheds (no buffer) for seven years. The experimental design consists of four watersheds under pasture management which were monitored from 2002 through 2008; two with agroforestry buffers (AgB 100 and AgB 300) and two control watersheds (CW 400 and CW 600). Pasture areas included red clover (Trifolium pretense L.) and lespedeza (Kummerowia stipulacea Maxim.) planted into fescue (Festuca arundinacea Schreb.) while the agroforestry buffer area included Eastern cottonwood trees (Populus deltoids Bortr. ex Marsh.) planted into fescue. The APEX model was calibrated from 2002 to 2005 and was validated from 2006 to 2008. The r 2 and NSE values for the calibration and validation periods of the runoff varied from 0.52 to 0.78 and 0.50 to 0.74, respectively. The model did not predict sediment loss very well probably due to insufficient number of measured events and low measured sediment loss. The measured runoff was 57% higher for CW watersheds compared to AgB watersheds. The measured sediment loss was 95% higher for CW watersheds compared to AgB watersheds. After calibrating and validating the model, it was run for long-term scenario analyses for 10 years from 1999 to 2008. Simulated buffer width had a significant influence on runoff. Simulated runoff decreased by 24% when the buffer width was doubled compared to losses associated with the measured buffer width. Simulated runoff from the CW watersheds was 11% higher with double stocking density (relative to measured density) compared to AgB watersheds with double stocking density. With half stocking density (relative to measured density), the AgB watershed had 18% lower runoff compared to CW. Results from this study imply that establishment of agroforestry buffers on grazed pasture watersheds reduce runoff and sediment losses compared to control watersheds without buffers.

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Modeling the impacts of soil management practices on runoff, sediment yield, maize productivity, and soil organic carbon using APEX

Cited by 55 publications

References 34 publications

Design of Sustainable Biofuel Processes and Supply Chains: Challenges and Opportunities

Design of Sustainable Biofuel Processes and Supply Chains: Challenges and Opportunities

Would banning atrazine benefit farmers?

APEX model simulation of runoff and sediment losses for grazed pasture watersheds with agroforestry buffers

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