Daly Pasture OzFlux tower site

The Daly River Pasture flux station is located 62km south west of Pine Creek, Northern Territory: 14?03?48?S, 131?19?05?E.

The flux tower site is identified as tropical pasture, and the vegetation is dominated by species Chamaecrista rotundifolia (Round-leaf cassia cv. Wynn), Digitaria milijiana (Jarra grass) and Aristida sp. standing at approximately 0.3m tall. The soil at the site is a mixture of red kandosol and deep sand. Elevation of the site is close to 70m and mean annual precipitation at a nearby Bureau of Meteorology site is 1250mm.

Maximum temperatures range from 37.5?C (in October) to 31.2?C (in June), while minimum temperatures range from 12.6?C (in July) to 23.8?C (in January). Maximum temperatures vary on a seasonal basis between 6.3?C while minimum temperatures vary by 11.2?C.

The instrument mast is 15 meters tall. Heat, water vapour and carbon dioxide measurements are taken using the open-path eddy flux technique. Temperature, humidity, wind speed, wind direction, rainfall, incoming and reflected shortwave radiation and net radiation are measured.

Ancillary measurements taken at the site include LAI, leaf-scale physiological properties (gas exchange, leaf isotope ratios, N and chlorophyll concentrations), vegetation optical properties and soil physical properties. Airborne based remote sensing (Lidar and hyperspectral measurements) was carried out across the transect in September 2008.

戴利河牧场通量站（Daly River Pasture flux station）坐落于北领地派恩克里克西南62公里处，地理坐标为南纬14°03′48″、东经131°19′05″。

该通量塔站点为热带牧场类型，植被优势种为圆叶决明（Chamaecrista rotundifolia，Wynn品种）、贾拉草（Digitaria milijiana，Jarra grass）以及三芒草属（Aristida sp.），植株高度约0.3米。站点土壤为红色刚果土（red kandosol）与深沙的混合体，海拔接近70米；附近澳大利亚气象局站点记录的年平均降水量为1250毫米。

极端最高气温介于37.5℃（10月）至31.2℃（6月）之间，极端最低气温则介于12.6℃（7月）至23.8℃（1月）之间。最高气温的季节波动幅度为6.3℃，最低气温的季节波动幅度为11.2℃。

观测桅杆高15米。采用开路涡度通量技术（open-path eddy flux technique）开展热量、水汽与二氧化碳的通量观测。同步测量的参数包括气温、相对湿度、风速、风向、降雨量、入射与反射短波辐射以及净辐射。

站点配套开展的辅助观测项目包括叶面积指数（LAI）、叶片尺度生理特性（气体交换、叶片同位素比率、氮与叶绿素浓度）、植被光学特性以及土壤物理特性。2008年9月，研究团队沿样带开展了机载遥感探测，涵盖激光雷达（Lidar）与高光谱测量。

搜集汇总

背景与挑战

背景概述

该数据集是澳大利亚北领地Daly河牧场通量塔站点的长期观测数据，属于OzFlux项目的一部分。它通过开路涡度协方差技术测量热、水蒸气和二氧化碳通量，并记录温度、湿度、风速、辐射等多种环境参数，覆盖2007年至2013年期间，主要用于热带牧场生态系统的气候和生态研究。