Photodegradation accelerates ecosystem N cycling in a simulated California grassland

Asao, Shinichi; Parton, William J.; Chen, Maosi; Gao, Wei

doi:10.1002/ecs2.2370

Title: Photodegradation accelerates ecosystem N cycling in a simulated California grassland

Journal Article · Mon Aug 13 00:00:00 EDT 2018 · Ecosphere

DOI:https://doi.org/10.1002/ecs2.2370· OSTI ID:1464424

^[1]; Parton, William J. ^[1]; Chen, Maosi ^[1]; Gao, Wei ^[2]

USDA UV‐B Monitoring and Research Program Natural Resource Ecology Laboratory Colorado State University Fort Collins Colorado 80523 USA
USDA UV‐B Monitoring and Research Program Natural Resource Ecology Laboratory Colorado State University Fort Collins Colorado 80523 USA, Department of Ecosystem Science and Sustainability Colorado State University Fort Collins Colorado 80523 USA

Abstract Photodegradation accelerates litter decay in arid grasslands where plant growth and litter decay are strongly controlled by precipitation and evapotranspiration. However, the effects of photodegradation on ecosystem C and N dynamics are not well understood. We examined the effects using an ecosystem biogeochemical model DayCent‐ UV with photodegradation explicitly represented and validated. The model was parameterized for a California grassland where photodegradation was documented to release CO ₂ from litter. The model was parameterized with an inverse modeling approach using an extensive data set of six years of daily observed carbon and water gas exchange (gross primary production, ecosystem respiration, and evapotranspiration), soil temperature, and soil moisture. DayCent‐ UV correctly simulated the seasonal patterns of the observed gas exchange and closely simulated the inter‐annual variation in the gas exchange and biomass production rates. The simulations suggested that the inter‐annual variation is driven more by actual evapotranspiration than by precipitation because a large portion of precipitation is lost as runoff during wet years. Photodegradation in DayCent‐ UV accelerated C and N cycling, decreasing system C and N by 9.2% and 9.5% and C and N residence times by 9.4% and 18.2%. Accelerated N cycling made a greater fraction of system N available for plants, increasing net N mineralization and plant production for a given amount of system N. Increased net N mineralization was due to decreased immobilization by microbes in the aboveground organic matter. Photodegradation did not alter the control on plant production by evapotranspiration. These results suggest that at the ecosystem level, the central effect of photodegradation is to suppress microbial activity. We conclude that photodegradation accelerates N cycling at the expense of microbes in this grassland, making it more efficient in supporting plant growth for a given amount of N in the system.

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Research Organization:: Univ. of Illinois, Champaign, IL (United States). Center for Advanced Bioenergy and Bioproducts Innovation

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Contributing Organization:: U.S. Department of Agriculture (USDA) UV-B Monitoring and Research Program, Colorado State University, under USDA National Institute of Food and Agriculture Grant 2016-34263-25763. S. Asao was also supported by Australian Research Council Grant CE140100008. AmeriFlux data used were supported in part by the Office of Science (BER), U.S. Department of Energy, Grant No. DE-FG02-03ER63638. W.J. Parton was also supported by USDA cooperative agreements (58-5402-4-001, 59-1902-4-00), the USDA National Institute of Food and Agriculture (NIFA) project (2015-67003-23456),

Grant/Contract Number:: DE‐FG02‐03ER63638; SC0018420

OSTI ID:: 1464424

Alternate ID(s):: OSTI ID: 1465377; OSTI ID: 1467752

Journal Information:: Ecosphere, Journal Name: Ecosphere Vol. 9 Journal Issue: 8; ISSN 2150-8925

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 9 works

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54 ENVIRONMENTAL SCIENCES
biogeochemistry
C and N cycling
DayCent
ecosystem modeling
grassland
litter decomposition
photodecay
photodegradation
solar radiation
ultraviolet radiation

Title: Photodegradation accelerates ecosystem N cycling in a simulated California grassland

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