Simulating measurable ecosystem carbon and nitrogen dynamics with the mechanistically defined MEMS 2.0 model

For decades, predominant soil biogeochemical models have used conceptual soil organic matter (SOM) pools and only simulated them to a shallow depth in soil. Efforts to overcome these limitations have prompted the development of the new generation SOM models, including MEMS 1.0, which represents meas...

Celý popis

Uloženo v:

Podrobná bibliografie
Vydáno v:	Biogeosciences Ročník 18; číslo 10; s. 3147 - 3171
Hlavní autoři:	Zhang, Yao, Lavallee, Jocelyn M., Robertson, Andy D., Even, Rebecca, Ogle, Stephen M., Paustian, Keith, Cotrufo, M. Francesca
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Katlenburg-Lindau Copernicus GmbH 26.05.2021 Copernicus Publications, EGU Copernicus Publications
Témata:	Accuracy Analysis Biogeochemistry Calibration Carbon Carbon content Decomposition Dynamics Ecosystem models Ecosystems Efficiency Environmental aspects ENVIRONMENTAL SCIENCES environmental sciences & ecology Evapotranspiration Farming systems Forest management geology Grasslands Hypotheses Immobilization Microelectromechanical systems Mineralization Moisture content Nitrogen Organic matter Plant growth Primary production Root zone Seasonal variation Seasonal variations Simulation Soil Soil organic matter Soil profiles Soil properties Soil temperature Soil water Soils Stocks Temperature
ISSN:	1726-4189, 1726-4170, 1726-4189
On-line přístup:	Získat plný text
Tagy:	Přidat tag Žádné tagy, Buďte první, kdo vytvoří štítek k tomuto záznamu!

Popis
Shrnutí:	For decades, predominant soil biogeochemical models have used conceptual soil organic matter (SOM) pools and only simulated them to a shallow depth in soil. Efforts to overcome these limitations have prompted the development of the new generation SOM models, including MEMS 1.0, which represents measurable biophysical SOM fractions, over the entire root zone, and embodies recent understanding of the processes that govern SOM dynamics. Here we present the result of continued development of the MEMS model, version 2.0. MEMS 2.0 is a full ecosystem model with modules simulating plant growth with above- and belowground inputs, soil water and temperature by layer, decomposition of plant inputs and SOM, and mineralization and immobilization of nitrogen (N). The model simulates two commonly measured SOM pools – particulate and mineral-associated organic matter (POM and MAOM, respectively). We present results of calibration and validation of the model with several grassland sites in the US. MEMS 2.0 generally captured the soil carbon (C) stocks (R2 of 0.89 and 0.6 for calibration and validation, respectively) and their distributions between POM and MAOM throughout the entire soil profile. The simulated soil N matches measurements but with lower accuracy (R2 of 0.73 and 0.31 for calibration and validation of total N in SOM, respectively) than for soil C. Simulated soil water and temperature were compared with measurements, and the accuracy is comparable to the other commonly used models. The seasonal variation in gross primary production (GPP; R2 = 0.83), ecosystem respiration (ER; R2 = 0.89), net ecosystem exchange (NEE; R2 = 0.67), and evapotranspiration (ET; R2 = 0.71) was well captured by the model. We will further develop the model to represent forest and agricultural systems and improve it to incorporate new understanding of SOM decomposition.
Bibliografie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 AR0000826; 1743237; 2016003; 4550183252 National Science Foundation (NSF) Shell Inc. USDOE Advanced Research Projects Agency - Energy (ARPA-E)
ISSN:	1726-4189 1726-4170 1726-4189
DOI:	10.5194/bg-18-3147-2021