The 2013 FLEX—US airborne campaign at the Parker Tract Loblolly Pine Plantation in North Carolina, USA
作者： Elizabeth Middleton , Uwe Rascher , Lawrence Corp , K. Huemmrich , Bruce Cook
DOI: 10.3390/RS9060612
关键词:
摘要: The first European Space Agency (ESA) and NASA collaboration in an airborne campaign to support ESA’s FLuorescence EXplorer (FLEX) mission was conducted North Carolina, USA during September–October 2013 (FLEX-US 2013) at the Parker Tract Loblolly Pine (LP) Plantation (Plymouth, NC, USA). This combined two unique instrument packages obtain simultaneous observations of solar-induced fluorescence (SIF), LiDAR-based canopy structural information, visible through shortwave infrared (VSWIR) reflectance spectra, surface temperature, advance vegetation studies carbon cycle dynamics ecosystem health. We obtained statistically significant results for fluorescence, tower fluxes from data collected four times day over consecutive autumn days across age class chronosequence. Both red (F685) far-red (F740) radiances had highest values mid-day, but their yields exhibited different diurnal responses LP classes. trends F685 varied with forest temperature difference (canopy minus air), having a stronger daily amplitude change young vs. old canopies. Photochemical Reflectance Index (PRI) positively correlated this variable cycle. Tower measurements mature loblolly stand showed red/far-red ratio linearly related light use efficiency (LUE) cycle, performed even better morning/afternoon (without midday) observations. study demonstrates importance interpretation dynamics, need understand physiological processes, benefits combining reflectance, structure information clarify function versus characteristics coniferous forest.
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