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Terrestrial vegetation is a key component of the biosphere, regulating global carbon, water and energy cycles. As the initial carbon fixed by vegetation through photosynthesis, terrestrial gross primary productivity (GPP) serves as a primary driver of the global carbon cycle and a key regulator of basic ecosystem functions, such as respiration and growth. Terrestrial GPP provides the total carbohydrate matter to sustain the food web, which directly contributes to human welfare. As a vital component of the water cycle, evapotranspiration (ET) is the sum of plant transpiration, soil evaporation and canopy interception. ET not only controls soil moisture and catchment water yield, but also affects regional precipitation patterns due to its feedback to the climate system. Overall, photosynthetic carbon uptake and water consumption through evapotranspiration are inherently coupled and represent two of the most critical functions of terrestrial vegetation. The advent of digital optical remote sensing and advanced ecosystem models have revolutionized our ability to monitor their dynamics.
- References:
Zhang, Y., Song, C., Sun, G., Band, L.E., 2019. No proportial increase of terrestrial gross primary production from the greening Earth. Journal of Geophysical Research: Biogeosciences.
Zhang, Y., Song, C., Sun, G., Band, L.E., McNulty, S., Noormets, A., Zhang, Q. and Zhang, Z., 2016. Development of a coupled carbon and water model for estimating global gross primary productivity and evapotranspiration based on eddy flux and remote sensing data. Agricultural and forest meteorology, 223, pp.116-131. https://doi.org/10.1016/j.agrformet.2016.04.003
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