Tumbarumba 1 FLUXNET Release 2026_r1

<p>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 as described by Isaac et al. (2017) for the quality control and post-processing steps. The final, gap-filled product containing Net Ecosystem Exchange (NEE) partitioned into Gross Primary Productivity (GPP) and Ecosystem Respiration (ER) has been produced using the ONEFlux software as described in Pastorello et al. (2020). This data set has been produced as part of the FLUXNET Shuttle project.</p> <p>The Tumbarumba flux station is located in the Bago State forest in south eastern New South Wales (GPS coordinates: -35.6566, 148.1517)<br />The forest is classified as wet sclerophyll, the dominant species is alpine ash (<em>Eucalyptus delegatensis</em>), and average tree height is 40m. Elevation of the site is 1200m and mean annual precipitation is 1000mm. The Bago and Maragle State Forests are adjacent to the south west slopes of southern New South Wales and the 48,400 ha of native forest have been managed for wood production for over 100 years.<br />The instrument mast is 70m tall. Fluxes of heat, water vapour and carbon dioxide are measured using the open-path eddy flux technique. Supplementary measurements above the canopy include temperature, humidity, wind speed, wind direction, rainfall, incoming and reflected shortwave radiation and net radiation. Profiles of temperature, humidity and CO₂ are measured at seven levels within the canopy. Soil moisture content is measured using Time Domain reflectometry, while soil heat fluxes and temperature are also measured. Hyperspectral radiometric measurements are being used to determine canopy leaf-level properties.</p> <p><strong>Bushfire Disturbance</strong><br />On New Year's Eve 2019 (31/12/2019) a bushfire swept through the Bago State Forest with a moderate severity burn (full understorey consumption but no canopy consumption). Prior to the fire, the forest had been growing without major disturbance over a period of almost 40 years, enabling study of its response to ongoing smaller disturbances such as insect outbreaks, droughts, normal weather fluctuations and internal stand dynamics.<br />The regrowth forest is structurally and functionally different to pre-fire conditions. The fast ground-fire caused nearly 100% mortality of the ash tree species, where the mountain gum (<em>Eucalyptus dalrympleana</em>) species resprouted with epicormic growth. There are high levels of ash regenerating from seedlings and other eucalypt trees (mountain gum and peppermint) are rapidly re-sprouting. There were around 10 months of data gap after the fire.</p>

本数据集发布版包含采用涡度协方差法（eddy covariance）开展的地表与大气边界层间能量与物质交换通量塔（flux tower）观测数据。数据的质量控制与后处理步骤采用PyFluxPro完成，处理流程参照Isaac等人（2017）的研究。最终的间隙填充数据集产品包含净生态系统交换（Net Ecosystem Exchange, NEE），该指标被划分为总初级生产力（Gross Primary Productivity, GPP）与生态系统呼吸（Ecosystem Respiration, ER），其生成采用了ONEFlux软件，流程参照Pastorello等人（2020）的研究。本数据集作为FLUXNET穿梭项目（FLUXNET Shuttle project）的一部分产出。

Tumbarumba通量站位于新南威尔士州东南部的巴戈国家森林公园（GPS坐标：-35.6566, 148.1517）。该森林属于湿硬叶林（wet sclerophyll），优势树种为高山桉（*Eucalyptus delegatensis*），平均树高40米。站点海拔1200米，年平均降水量1000毫米。巴戈与马格尔国家森林公园毗邻新南威尔士州南部的西南坡，这片4.84万公顷的原生林已有超百年的木材生产管理历史。
观测仪器塔高70米，采用开路式涡度通量技术测量热量、水汽与二氧化碳通量。冠层上方的补充观测包括温度、湿度、风速、风向、降雨量、入射与反射短波辐射以及净辐射。冠层内7个高度层分别开展温度、湿度与二氧化碳廓线观测。土壤含水率采用时域反射法（Time Domain reflectometry）测量，同时同步观测土壤热通量与土壤温度。当前正采用高光谱辐射测量手段获取冠层叶片级属性参数。

**火灾干扰**
2019年新年前夜（2019/12/31），一场中度烈度山火席卷巴戈国家森林公园，火烧导致林下植被完全焚毁，但未破坏冠层。火灾发生前，该森林已近40年未经历重大扰动，为研究其对昆虫暴发、干旱、常规气象波动以及林分内部动态等小型持续扰动的响应提供了理想条件。
火后再生林在结构与功能上均与火前状态存在差异：快速蔓延的地表火烧导致高山桉几乎100%死亡，而山毛榉桉（*Eucalyptus dalrympleana*，即mountain gum）则通过萌蘖更新存活。目前已有大量高山桉实生苗完成更新，其他桉树树种（山毛榉桉与薄荷桉）亦在快速萌蘖恢复。火灾后该站点存在约10个月的观测数据缺失期。