Improving and disaggregating N2O emission factors for ruminant excreta on temperate pasture soils

pre-printCattle excreta deposited on grazed grasslands are a major source of the greenhouse gas (GHG) nitrous oxide (N2O). Currently, many countries use the IPCC default emission factor (EF) of 2% to estimate excreta-derived N2O emissions. However, emissions can vary greatly depending on the type of excreta (dung or urine), soil type and timing of application. Therefore three experiments were conducted to quantify excreta-derived N2O emissions and their associated EFs, and to assess the effect of soil type, season of application and type of excreta on the magnitude of losses. Cattle dung, urine and artificial urine treatments were applied in spring, summer and autumn to three temperate grassland sites with varying soil and weather conditions. Nitrous oxide emissions were measured from the three experiments over 12 months to generate annual N2O emission factors. The EFs from urine treated soil was greater (0.30–4.81% for real urine and 0.13–3.82% for synthetic urine) when compared with dung (− 0.02–1.48%) treatments. Nitrous oxide emissions were driven by environmental conditions and could be predicted by rainfall and temperature before, and soil moisture deficit after application; highlighting the potential for a decision support tool to reduce N2O emissions by modifying grazing management based on these parameters. Emission factors varied seasonally with the highest EFs in autumn and were also dependent on soil type, with the lowest EFs observed from well-drained and the highest from imperfectly drained soil. The EFs averaged 0.31 and 1.18% for cattle dung and urine, respectively, both of which were considerably lower than the IPCC default value of 2%. These results support both lowering and disaggregating EFs by excreta type.This research was financially supported under the National Development Plan, through the Research Stimulus Fund, administered by the Department of Agriculture, Food and the Marine (Grant numbers RSF10/RD/SC/716 and 11S138)

McGrath Corridor - A vision for the future in Somerville, MA

Project Goals This project seeks to create opportunities for green connections and city beautification along the McGrath Highway corridor. Key directives are: • Build greenway connections including pedestrian path and bike lanes • Increase open space • Minimize storm water flows and create on site infiltration through green infrastructure. • Improve tree canopy • Enhance economic growth and revitalization The studio’s primary goal is to plan this urban greenway project at multiple scales. The studio synthesizes information about natural features, recreation resources, and development patterns to create a green infrastructure network that addresses the unique problems and opportunities of the study area. Moreover, the studio focuses on finding innovative strategies for enhancing green space in the city, creating urban wildlife habitats, improving recreation access, and enhancing environmental quality

Western Woburn Greenway Study

In spring 2010, the Department of Landscape Architecture and Regional Planning at the University of Massachusetts Amherst was asked to complete a landscape planning study, the “Western Woburn Greenway Study” for the City of Woburn, MA. The study was undertaken by a team of graduate students, supervised by Professor Jack Ahern. The goals of that study are as follows. The City of Woburn currently has two large parcel groups of undeveloped land, Whispering Hill (the north focus area) and Winning/Shannon Farms (the south focus area) that are, or may become, available for acquisition (see “Scope of Project” below). The first goal of the study was to analyze these focus areas and conduct suitability assessments for potential land uses that meet the needs of the residents of Woburn, as well as meet the goals specified by the town’s 2004 Open Space and Recreation Plan. The analysis and land use recommendations could be used by the city in current and future land acquisition decisions. The second goal of the study was to evaluate strategies and actions for connecting these focus areas with linkages to each other, to other existing open spaces in Woburn, and to other green spaces in neighboring towns. These linkages could be obtained with Green Streets an