![]() ![]() Terrestrial and marine GPP and ecosystem respiration (ER, as the respiration from all heterotrophic and autotrophic organisms) control land-atmosphere and ocean-atmosphere CO 2 exchange with feedbacks on the world’s climate (Falkowski and others 1998 Heimann and Reichstein 2008 Beer and others 2010). Terrestrial GPP is the largest global carbon flux on Earth and drives critical ecosystem functions, foremost respiration, growth, and nutrient cycling. Primary producers fix carbon dioxide (CO 2) as organic carbon through photosynthesis, a flux known at the ecosystem level as gross primary production (GPP). Our machine learning approach sheds new light on the spatiotemporal dynamics of ecosystem metabolism at the network scale, which is a prerequisite to integrate aquatic and terrestrial carbon cycling at relevant scales. Furthermore, we found large terrestrial subsidies fueling ER, pointing to an unexpectedly high network-scale level of heterotrophy, otherwise masked by simply considering reach-scale NEP estimations. Our results suggest that ER rather than GPP drives the metabolic stability at the network scale, which is likely attributable to the buffering function of the streambed for ER, while GPP is more susceptible to flow-induced disturbance and fluctuations in light availability. In agreement with the River Continuum Concept, small headwaters and larger downstream reaches contributed 16% and 60%, respectively, to the annual network-scale GPP. We found that the annual network-scale metabolism was heterotrophic yet with a clear peak of autotrophy in spring. ![]() We further predicted available light and thermal regimes for the entire network and expanded the library of stream metabolism predictors. Here, combining Random Forest (RF) with time series of sensor data in 12 reach sites, we predicted annual regimes of GPP, ER, and NEP in 292 individual stream reaches and disclosed properties emerging from the network they form. Yet, resolving in both space and time gross primary production (GPP), ecosystem respiration (ER) and net ecosystem production (NEP) at the scale of entire stream networks has been elusive so far. ![]() Tech Research Trend: Hear from Consumer Technology Association on what tech trends are on the horizon and being showcased at CES 2023.Streams and rivers form dense networks that drain the terrestrial landscape and are relevant for biodiversity dynamics, ecosystem functioning, and transport and transformation of carbon.Distribution in the Energy Sector: Vision for 2050: Less consumption and more innovation in the transformation to a green, efficient, and smart energy.Building Equitable Technology in the Finance Sector: How companies ensure their tech is built by and for end users to maximize inclusion and business outcomes.Leadership in Scaling for a Better Tomorrow: Learn how leadership is impacting areas like climate, digital, energy, clean water, and supply chain.Join us to see how global partnerships create tech for a better tomorrow. The event was produced in partnership with the Netherlands Ministry of Economic Affairs and Climate Policy.įrom promising startups to established brands, the CES Unveiled series provides the ultimate sneak peek of what will be launched to the world at CES 2023 in Las Vegas. Thursday, 13 October 2022 Beurs van BerlageĬES ® Unveiled returned to the Netherlands to preview and showcase upcoming products and trends in technology. ![]()
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