Evaluation of soil nitrogen emissions from riparian zones coupling simple process-oriented models with remote sensing...

Area of Science:

• Environmental Science
• Soil Science
• Ecology

Background:

• Riparian ecosystems play a crucial role in mitigating non-point source pollution and sustaining aquatic health.
• Understanding nitrogen (N) cycling and gaseous N emissions in these zones is essential for effective environmental management.

Purpose of the Study:

• To enhance the spatial and temporal prediction of gaseous N emissions from soils in riparian buffer zones.
• To couple a process-oriented soil denitrification model with remote sensing data for improved N emission modeling.

Main Methods:

• Extended a soil denitrification model with a nitrogen (N) cycle model and integrated land surface remote sensing data (SPOT-5, Landsat-5 TM).
• Incorporated soil heat budget, moisture variations, N movement, nitrification, denitrification, and ammonia volatilization.
• Used laboratory and in situ experiments for parameter estimation, calibration, and validation; verified simulated N emissions with R(2)=0.83.

Main Results:

• Soil moisture was identified as the most sensitive parameter influencing gaseous N emissions.
• Denitrification emerged as the primary process responsible for N losses to the atmosphere in the riparian area.
• The model successfully predicted N emissions with high accuracy.

Conclusions:

• The study highlights the importance of adapting land cover and land use strategies in riparian areas.
• Recommendations focus on enhancing ecological restoration of wetland systems surrounding critical water resources like the Guanting reservoir.
• Optimized land management can improve the ecological function of riparian buffers.