Sturt Plains Flux Data Release 2025_v2

This release consists of flux tower measurements of the exchange of energy and mass between the surface and the atmospheric boundary-layer using eddy covariance techniques. Data were processed using PyFluxPro (v3.4.21) as described by Isaac et al. (2017). PyFluxPro produces a final, gap-filled product with Net Ecosystem Exchange (NEE) partitioned into Gross Primary Productivity (GPP) and Ecosystem Respiration (ER).

The site is located on a low lying plain dominated by Mitchell Grass (Astrebla spp.). Elevation of the site is close to 250 m and mean annual precipitation at a nearby Bureau of Meteorology site is 640 mm. Maximum temperatures range from 28.4 °C (in June/ July) to 39.1 °C (in December), while minimum temperatures range from 11.2 °C (in July) to 24.4 °C (in December).

The instrument mast is 5 m tall. Heat, water vapour and carbon dioxide measurements are taken using the open-path eddy flux technique. Temperature, humidity, wind speed, wind direction, rainfall and net radiation are measured. Soil heat fluxes are measured and soil moisture content is gathered using time domain reflectometry.

Ancillary measurements taken at the site include LAI, leaf-scale physiological properties (gas exchange, leaf isotope ratios, nitrogen and chlorophyll concentrations), vegetation optical properties and soil physical properties. Airborne based remote sensing (Lidar and hyperspectral measurements) was carried out at the site in September 2008. Biomass harvest measured: mean live biomass 0.00 gm-2 (standard error: 0.00), mean standing dead biomass 163.42 gm-2 (standard error: 16.73), mean litter biomass 148.99 gm-2 (standard error: 21.32), total mean biomass 312.40 gm-2 (standard error: 30.80). Soil consists of: clay 14.47%, silt 51.23%, sand 34.30%.

本数据集包含采用涡度协方差技术（eddy covariance techniques）获取的地表-大气边界层能量与物质交换通量塔观测数据。数据处理采用PyFluxPro（v3.4.21）完成，处理流程参照Isaac等人（2017）的研究方法。PyFluxPro可生成最终的间隙填充数据集，将净生态系统交换（Net Ecosystem Exchange）划分为总初级生产力（Gross Primary Productivity）与生态系统呼吸（Ecosystem Respiration）。
该站点位于以米切尔草（Astrebla属）为优势物种的低海拔平原。站点海拔接近250米，邻近澳大利亚气象局站点记录的年平均降水量为640毫米。最高气温介于28.4℃（6/7月）至39.1℃（12月）之间，最低气温介于11.2℃（7月）至24.4℃（12月）之间。
观测塔高5米。采用开路式涡度通量技术测量感热、水汽与二氧化碳通量。同步观测气温、相对湿度、风速、风向、降雨量及净辐射。土壤热通量通过实测获取，土壤含水率则采用时域反射仪（time domain reflectometry）采集。
站点配套观测项目还包括叶面积指数（LAI）、叶片尺度生理特性（气体交换、叶片同位素比值、氮与叶绿素浓度）、植被光学特性及土壤物理特性。2008年9月于该站点开展了机载遥感观测，涵盖激光雷达（Lidar）与高光谱测量。生物量采样结果如下：活生物量均值为0.00克每平方米（标准误：0.00），立枯生物量均值为163.42克每平方米（标准误：16.73），凋落物生物量均值为148.99克每平方米（标准误：21.32），总生物量均值为312.40克每平方米（标准误：30.80）。土壤颗粒组成：黏土占比14.47%，粉粒占比51.23%，砂粒占比34.30%。