Dissertation Research: The effect of human management and soil properties on heavy metal content of Los Angeles Community Garden soils

论文研究：人类管理和土壤性质对洛杉矶社区花园土壤重金属含量的影响

• 批准号: 1210953
• 负责人: George Jenerette
• 金额: $ 1.5万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-06-01 至 2014-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1210953&HistoricalAwards=false
• 关键词: Dissertation; Research; effect; human; management

Community gardens are hotspots of interactions between humans and the environment. Little is known about biogeochemical cycles or metal accumulation in these constructed ecosystems, both of which can impact the health of crops and the people who consume them. These knowledge gaps will be addressed by investigating the impact of management, land use legacy, and neighborhood on soil and crop metal availability in Los Angeles community gardens. Soils will be collected in 12 gardens from cultivated, uncultivated, and surrounding locations and analyzed for pH and concentrations of nutrients, organic matter, and 29 metals. Leafy and root vegetable samples will be collected from each garden and tested for metal concentrations to determine bioavailability and human exposure risk. Gardeners will also be interviewed about their management activities. A multiple regression framework will be used to determine if gardening practices or neighborhood characteristics (e.g., freeway proximity, previous land use) can be used to predict soil metal concentrations and bioavailability at gardener, garden, and regional scales.Data pertaining to management influence on metal availability will be of use to garden managers and city planning departments. The metal content of urban soils and crops in Los Angeles has important human health implications. Reports on metal content of garden soils and crops, as well as educational materials on soil testing, will be presented to garden managers, participants, and supporting non-profit agencies. These activities will provide access to scientific resources for minority populations.

社区花园是人类与环境互动的热点。人们对这些人造生态系统中的生物地球化学循环或金属积累知之甚少，这两者都会影响农作物和食用农作物的人的健康。这些知识差距将通过调查管理、土地利用遗产和社区对洛杉矶社区花园土壤和农作物金属可用性的影响来解决。将从耕种、未耕种和周边地区收集 12 个花园的土壤，并分析 pH 值以及养分、有机质和 29 种金属的浓度。将从每个花园收集叶类和根类蔬菜样品并测试金属浓度，以确定生物利用度和人类暴露风险。园丁还将接受有关他们管理活动的采访。将使用多元回归框架来确定园艺实践或社区特征（例如，高速公路邻近度、以前的土地使用情况）是否可用于预测园丁、花园和区域尺度的土壤金属浓度和生物有效性。有关管理对金属可用性影响的数据将供花园管理者和城市规划部门使用。洛杉矶城市土壤和农作物的金属含量对人类健康具有重要影响。关于花园土壤和农作物金属含量的报告以及土壤测试的教育材料将提交给花园管理者、参与者和支持非营利机构。这些活动将为少数群体提供获得科学资源的机会。