FluoSpec 2—An Automated Field Spectroscopy System to Monitor Canopy Solar-Induced Fluorescence
Xi Yang,
Hanyu Shi,
Atticus Stovall,
Kaiyu Guan,
Guofang Miao,
Yongguang Zhang,
Yao Zhang,
Xiangming Xiao,
Youngryel Ryu,
Jung-Eun Lee
Affiliations
Xi Yang
Department of Environmental Sciences, University of Virginia, Charlottesville, VA 22904, USA
Hanyu Shi
Department of Environmental Sciences, University of Virginia, Charlottesville, VA 22904, USA
Atticus Stovall
Department of Environmental Sciences, University of Virginia, Charlottesville, VA 22904, USA
Kaiyu Guan
Department of Natural Resources and Environmental Sciences, University of Illinois at Urbana and Champaign, Champaign, IL 61801, USA
Guofang Miao
Department of Natural Resources and Environmental Sciences, University of Illinois at Urbana and Champaign, Champaign, IL 61801, USA
Yongguang Zhang
Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Sciences, Nanjing University, Nanjing 210023, China
Yao Zhang
Department of Microbiology and Plant Biology, Center for Spatial Analysis, University of Oklahoma, Norman, OK 73019, USA
Xiangming Xiao
Department of Microbiology and Plant Biology, Center for Spatial Analysis, University of Oklahoma, Norman, OK 73019, USA
Youngryel Ryu
Department of Landscape Architecture and Rural Systems Engineering, Seoul National University, Seoul 08826, Korea
Jung-Eun Lee
Department of Earth, Environment, and Planetary Sciences, Brown University, Providence, RI 02912, USA
Accurate estimation of terrestrial photosynthesis has broad scientific and societal impacts. Measurements of photosynthesis can be used to assess plant health, quantify crop yield, and determine the largest CO2 flux in the carbon cycle. Long-term and continuous monitoring of vegetation optical properties can provide valuable information about plant physiology. Recent developments of the remote sensing of solar-induced chlorophyll fluorescence (SIF) and vegetation spectroscopy have shown promising results in using this information to quantify plant photosynthetic activities and stresses at the ecosystem scale. However, there are few automated systems that allow for unattended observations over months to years. Here we present FluoSpec 2, an automated system for collecting irradiance and canopy radiance that has been deployed in various ecosystems in the past years. The instrument design, calibration, and tests are recorded in detail. We discuss the future directions of this field spectroscopy system. A network of SIF sensors, FluoNet, is established to measure the diurnal and seasonal variations of SIF in several ecosystems. Automated systems such as FluoSpec 2 can provide unique information on ecosystem functioning and provide important support to the satellite remote sensing of canopy photosynthesis.
