Combined effects of short term rainfall patterns and soil texture on soil nitrogen cycling - a modeling analysis

Journal of Contaminant Hydrology
Chuanhui Gu, William J Riley

Abstract

Precipitation variability and magnitude are expected to change in many parts of the world over the 21st century. We examined the potential effects of intra-annual rainfall patterns on soil nitrogen (N) transport and transformation in the unsaturated soil zone using a deterministic dynamic modeling approach. The model based on TOUGHREACT [corrected], which has been tested and applied in several experimental and observational systems, mechanistically accounts for microbial activity, soil moisture dynamics that respond to precipitation variability, and gaseous and aqueous tracer transport in the soil. Here, we further tested and calibrated the model against data from a precipitation variability experiment in a tropical system in Costa Rica. The model was then used to simulate responses of soil moisture, microbial dynamics, N leaching, and N trace-gas emissions to changes in rainfall patterns; the effect of soil texture was also examined. The temporal variability of nitrate leaching and NO, NH(3), and N(2)O effluxes were significantly influenced by rainfall dynamics. Soil texture combined with rainfall dynamics altered soil moisture dynamics, and consequently regulated soil N responses to precipitation changes. The clay loam soil m...Continue Reading

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Citations

Apr 4, 2016·Environmental Monitoring and Assessment·Mariela A YevenesLaura Farías
Jun 29, 2011·FEMS Microbiology Ecology·Julien OllivierMichael Schloter
Apr 18, 2020·Global Change Biology·Zhaolei LiShuli Niu
Mar 1, 2012·Journal of Environmental Quality·Andrew M O'ReillyZhemin Xuan
Jun 14, 2017·Antonie van Leeuwenhoek·Nguyen E López-LozanoJoana Falcão Salles
Apr 6, 2021·Frontiers in Microbiology·Qiong WangChunxiang Hu

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