2019/2020 Bushfire and Water Quality Project: Impact of temperatures on soil leachability

This soil burn and leachate data set was prepared to assess the impact of fire on soil leachability and potential ecological risks. Soils representative of major geological types, unaffected by fires, were collected from nine locations along the east coast of NSW: consisting of three sedimentary soil types: Cumberland State Forest, Lake Parramatta and Hat Head, two metamorphic soil types: Port Macquarie and Yarriabini National Park, three igneous soil types: Bellmore Falls (Budderoo), Robertson National Park and Middle Brother National Park, and one coastal plains organic soil: Crescent Head/Bellmore Swamp. The soils were characterised for metal and nutrient (N, P) levels and analysed using X-ray diffractometry (XRD) to determine their mineralogical composition. The soils were then subjected to a simulated fire impact experiment, where they were treated at temperatures of 200 °C (low-moderate severity), 500 °C (high severity), and 850 °C (extreme severity) for 30 minutes, along with an untreated control (unburnt). After cooling, the soils were leached using a modified version of the Toxicity Characteristic Leaching Procedure (TCLP) as outlined in the USEPA SW-846 Test Method 1311 in freshwater. Dissolved metals, total nutrients, and dissolved nutrients were sampled and analysed in the leachates. This data fed into a leachate assessment and a preliminary aquatic ecological risk assessment, with a report to be released soon. The data presented in this spreadsheet is:\r\n•\tinitial characterisation data set for each soil including metals, nutrients organic matter and moisture content.\r\n•\tXRD data for the soils in unburnt, 200 °C and 850 °C treatments.\r\n•\tLeachate data for total nutrients, dissolved nutrients and dissolved metals.\r\n

本土壤燃烧与渗滤液数据集旨在评估火灾对土壤渗滤性及潜在生态风险的影响。研究从新南威尔士州（New South Wales, NSW）东海岸9个点位采集了未受火灾干扰的典型主要地质类型土壤，其中包含3种沉积型土壤：坎伯兰州立森林、帕拉马塔湖与哈特角；2种变质型土壤：麦夸里港及亚里亚比尼国家公园；3种火成型土壤：贝尔莫尔瀑布（巴德罗）、罗伯逊国家公园与中兄弟国家公园；以及1种海岸平原有机土壤：新月角/贝尔莫尔沼泽。研究人员对这些土壤的金属与养分（氮、磷）水平进行了表征，并采用X射线衍射法（X-ray diffractometry, XRD）分析其矿物组成。随后对土壤开展模拟火灾影响试验，分别以200℃（中低烈度）、500℃（高烈度）与850℃（极端烈度）处理30分钟，同时设置未处理对照组（未燃烧样本）。待土壤冷却后，采用美国环境保护署（United States Environmental Protection Agency, USEPA）SW-846测试方法1311中规定的改进型毒性特征浸出程序（Toxicity Characteristic Leaching Procedure, TCLP）在淡水环境中进行浸提操作。随后对浸提液中的溶解态金属、总养分及溶解态养分进行采样与分析。本数据集将用于渗滤液评估及初步水生生态风险评估，相关研究报告即将发布。本电子表格包含如下数据：
• 各土壤的初始表征数据集，涵盖金属、养分、有机质与含水率。
• 未处理、200℃及850℃处理组土壤的XRD数据。
• 总养分、溶解态养分及溶解态金属的浸提液数据。