Modelling spatio-temporal patterns of soil carbon and greenhouse gas emissions in grazing lands: Current status and prospects

A - Papers appearing in refereed journals

Wang, J., Li, Y., Bork, E. W., Richter, G. M., Eum, H-I., Chen, C., Shah. S. H. H. and Mezbahiddin, S. 2020. Modelling spatio-temporal patterns of soil carbon and greenhouse gas emissions in grazing lands: Current status and prospects. Science of the Total Environment. 739 (Article), p. 139092. https://doi.org/10.1016/j.scitotenv.2020.139092

AuthorsWang, J., Li, Y., Bork, E. W., Richter, G. M., Eum, H-I., Chen, C., Shah. S. H. H. and Mezbahiddin, S.
Abstract

The sustainability of grazing lands lies in the nexus of human consumption behavior, livestock productivity, and environmental footprint. Due to fast growing global food demands, many grazing lands have suffered from overgrazing, leading to soil degradation, air and water pollution, and biodiversity losses. Multidisciplinary efforts are required to understand how these lands can be better assessed and managed to attain predictable outcomes of optimal benefit to society. This paper synthesizes our understanding based on previous work done on modelling the influences of grazing of soil carbon (SC) and greenhouse gas emissions to identify current knowledge gaps and research priorities. We revisit three widely-used process-based models: DeNitrification DeComposition (DNDC), DayCent, and the Pasture Simulation model (PaSim) and two watershed models: The Soil & Water Assessment Tool (SWAT) and Variable Infiltration Capacity Model (VIC), which are widely used to simulate C, nutrient and water cycles. We review their structures and ability as process-based models in representing key feedbacks among grazing management, SOM decomposition and hydrological processes in grazing lands. Then we review some significant advances in the use of models combining biogeochemical and hydrological processes. Finally, we examine challenges of incorporating spatial heterogeneity and temporal variability into modelling C and nutrient cycling in grazing lands and discuss their weakness and strengths. We also highlight key research direction for improving the knowledge base and code structure in modelling C and nutrient cycling in grazing lands, which are essential to conserve grazing lands and maintain their ecosystem goods and services.

KeywordsGrasslands; Agroecosystem; Coupling biogeochemical and hydrological modelling; Grazing management; Soil carbon; Nutrient cycles
Year of Publication2020
JournalScience of the Total Environment
Journal citation739 (Article), p. 139092
Digital Object Identifier (DOI)https://doi.org/10.1016/j.scitotenv.2020.139092
Web address (URL)https://www.sciencedirect.com/science/article/abs/pii/S0048969720326097?via%3Dihub
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeS2N - Soil to Nutrition - Work package 3 (WP3) - Sustainable intensification - optimisation at multiple scales
Output statusPublished
Publication dates
Online05 May 2020
Publication process dates
Accepted27 Apr 2020
PublisherElsevier Science Bv
ISSN0048-9697

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