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A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters

A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters

Published on: December 16, 2022

Response of bottom dissolved oxygen reduction to net ecosystem production observed by a wave-driven profiler in the

Di Wu¹, Kui Wang², Wei Fan¹

¹Ocean College, Zhejiang University, Zhoushan, Zhejiang, 316021, China.

Marine Environmental Research

|October 17, 2024

Abstract:

Coastal hypoxia, exacerbated by the combined influence of eutrophication and global warming, presents a significant environmental challenge. However, the lag correlation between organic matter (OM) export from the upper layers and bottom dissolved oxygen (DO_BOT) reduction still lack clear elucidation. This study investigated the coupling between net ecosystem production (NEP, representing the maximum OM export) and DO_BOT in the Changjiang River plume (CRP), using a wave-driven profiler system. The high-resolution profiles revealed rhythmic fluctuations in water column NEP, with sediment-water exchange (-74.6%) and NEP (-4.0%) dominating DO_BOT reduction. Notably, surface NEP impacts DO_BOT with a lag time of 25.65 h, indicating an OM sinking speed of 1.32 mm s^-1. NEP at a depth of 3.4 m exerted the most significant influence on DO_BOT, explaining a 12% reduction. These findings elucidate the response mechanism of DO_BOT reduction to upper OM export and provide insights for hypoxia prediction in coastal and estuarine areas.

Keywords:

Changjiang River Plume Coastal hypoxia Lag time Net ecosystem production Oxygen mass balance model Wave-driven profiler

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Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.

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