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Changing climate intensifies downstream eutrophication by enhancing nitrogen availability from tropical forests.

Pengtao Wang¹, Dongyang Han², Fei Yu¹

¹College of Life Sciences, Henan Normal University, Xinxiang 453007, Henan, PR China; Puyang Field Scientific Observation and Research Station for Yellow River Wetland Ecosystem, Henan, PR China.

The Science of the Total Environment

|October 17, 2024

Summary

Diffuse nutrient exports from tropical forests significantly impact downstream water quality. Rising temperatures and altered precipitation patterns exacerbate eutrophication by increasing nitrogen availability, threatening reservoir health.

Keywords:

Climate change Diffuse nutrient Eutrophication Tropical forest Watershed simulation

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Area of Science:

Environmental Science
Ecology
Water Quality Management

Background:

Diffuse nutrient exports from forests are a major driver of downstream eutrophication.
The complex interactions between nutrient runoff and meteorological factors remain insufficiently understood.

Purpose of the Study:

To investigate the impact of diffuse nutrient exports from tropical forests on chlorophyll a concentration.
To elucidate the coupling mechanisms between nutrient exports, meteorological factors, and eutrophication dynamics.

Main Methods:

Field sampling and laboratory analysis of water samples.
Statistical analysis, including correlation and regression.
Structural equation modeling and Monte Carlo simulations.

Main Results:

A strong positive correlation exists between air temperature and chlorophyll a concentration.
Diffuse nitrate exports significantly stimulate microalgal growth, with a positive linear relationship to chlorophyll a.
Temperature and precipitation are key regulators of chlorophyll a, influencing nitrogen availability.

Conclusions:

Eutrophication risks in tropical forest-adjacent reservoirs are heightened by climate change, particularly reduced precipitation.
Effective nitrate mitigation strategies are crucial for managing eutrophic water bodies in tropical regions.
Findings provide theoretical guidance for restoring eutrophic water systems under changing climatic conditions.