Decadal-scale dynamics of water, carbon and nitrogen in a California chaparral ecosystem

DAYCENT modeling results

Xuyong Li, Thomas Meixner, James O. Sickman, Amy E. Miller, Joshua P. Schimel, John M. Melack

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

The Mediterranean climate, with its characteristic of dry summers and wet winters, influences the hydrologic and microbial processes that control carbon (C) and nitrogen (N) biogeochemical processes in chaparral ecosystems. These biogeochemical processes in turn determine N cycling under chronic N deposition. In order to examine connections between climate and N dynamics, we quantified decadal-scale water, C and N states and fluxes at annual, monthly and daily time steps for a California chaparral ecosystem in the Sierra Nevada using the DAYCENT model. The daily output simulations of net mineralization, stream flow and stream nitrate (NO3 -) export were developed for DAYCENT in order to simulate the N dynamics most appropriate for the abrupt rewetting events characteristic of Mediterranean chaparral ecosystems. Overall, the magnitude of annual modeled net N mineralization, soil and plant biomass C and N, nitrate export and gaseous N emission agreed with those of observations. Gaseous N emission was a major N loss pathway in chaparral ecosystems, in which nitric oxide (NO) is the dominant species. The modeled C and N fluxes of net primary production (NPP), N uptake and N mineralization, NO3 - export and gaseous N emission showed both high inter-annual and intra-annual variability. Our simulations also showed dramatic fire effects on NPP, N uptake, N mineralization and gaseous N emission for three years of postfire. The decease in simulated soil organic C and N storages was not dramatic, but lasted a longer time. For the seasonal pattern, the predicted C and N fluxes were greatest during December to March, and lowest in the summer. The model predictions suggested that an increase in the N deposition rate would increase N losses through gaseous N emission and stream N export in the chaparral ecosystems of the Sierra Nevada due to changes in N saturation status. The model predictions could not capture stream NO3 - export during most rewetting events suggesting that a dry-rewetting mechanism representing the increase in N mineralization following soil wetting needs to be incorporated into biogeochemical models of semi-arid ecosystems.

Original languageEnglish (US)
Pages (from-to)217-245
Number of pages29
JournalBiogeochemistry
Volume77
Issue number2
DOIs
StatePublished - Feb 2006

Fingerprint

ecosystem modeling
chaparral
Ecosystems
Nitrogen
Carbon
rewetting
Water
mineralization
ecosystem
nitrogen
carbon
net primary production
Fluxes
Soils
Nitrates
water
nitrate
Stream flow
summer
nitric oxide

Keywords

  • Carbon and nitrogen cycling
  • Chaparral ecosystem
  • DAYCENT
  • Drying-rewetting pulse
  • Fire disturbance
  • Mediterranean-climate
  • Nitrogen deposition

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Environmental Science(all)

Cite this

Decadal-scale dynamics of water, carbon and nitrogen in a California chaparral ecosystem : DAYCENT modeling results. / Li, Xuyong; Meixner, Thomas; Sickman, James O.; Miller, Amy E.; Schimel, Joshua P.; Melack, John M.

In: Biogeochemistry, Vol. 77, No. 2, 02.2006, p. 217-245.

Research output: Contribution to journalArticle

Li, Xuyong ; Meixner, Thomas ; Sickman, James O. ; Miller, Amy E. ; Schimel, Joshua P. ; Melack, John M. / Decadal-scale dynamics of water, carbon and nitrogen in a California chaparral ecosystem : DAYCENT modeling results. In: Biogeochemistry. 2006 ; Vol. 77, No. 2. pp. 217-245.
@article{8304216e80504c31980233c6ef3a9c46,
title = "Decadal-scale dynamics of water, carbon and nitrogen in a California chaparral ecosystem: DAYCENT modeling results",
abstract = "The Mediterranean climate, with its characteristic of dry summers and wet winters, influences the hydrologic and microbial processes that control carbon (C) and nitrogen (N) biogeochemical processes in chaparral ecosystems. These biogeochemical processes in turn determine N cycling under chronic N deposition. In order to examine connections between climate and N dynamics, we quantified decadal-scale water, C and N states and fluxes at annual, monthly and daily time steps for a California chaparral ecosystem in the Sierra Nevada using the DAYCENT model. The daily output simulations of net mineralization, stream flow and stream nitrate (NO3 -) export were developed for DAYCENT in order to simulate the N dynamics most appropriate for the abrupt rewetting events characteristic of Mediterranean chaparral ecosystems. Overall, the magnitude of annual modeled net N mineralization, soil and plant biomass C and N, nitrate export and gaseous N emission agreed with those of observations. Gaseous N emission was a major N loss pathway in chaparral ecosystems, in which nitric oxide (NO) is the dominant species. The modeled C and N fluxes of net primary production (NPP), N uptake and N mineralization, NO3 - export and gaseous N emission showed both high inter-annual and intra-annual variability. Our simulations also showed dramatic fire effects on NPP, N uptake, N mineralization and gaseous N emission for three years of postfire. The decease in simulated soil organic C and N storages was not dramatic, but lasted a longer time. For the seasonal pattern, the predicted C and N fluxes were greatest during December to March, and lowest in the summer. The model predictions suggested that an increase in the N deposition rate would increase N losses through gaseous N emission and stream N export in the chaparral ecosystems of the Sierra Nevada due to changes in N saturation status. The model predictions could not capture stream NO3 - export during most rewetting events suggesting that a dry-rewetting mechanism representing the increase in N mineralization following soil wetting needs to be incorporated into biogeochemical models of semi-arid ecosystems.",
keywords = "Carbon and nitrogen cycling, Chaparral ecosystem, DAYCENT, Drying-rewetting pulse, Fire disturbance, Mediterranean-climate, Nitrogen deposition",
author = "Xuyong Li and Thomas Meixner and Sickman, {James O.} and Miller, {Amy E.} and Schimel, {Joshua P.} and Melack, {John M.}",
year = "2006",
month = "2",
doi = "10.1007/s10533-005-1391-z",
language = "English (US)",
volume = "77",
pages = "217--245",
journal = "Biogeochemistry",
issn = "0168-2563",
publisher = "Springer Netherlands",
number = "2",

}

TY - JOUR

T1 - Decadal-scale dynamics of water, carbon and nitrogen in a California chaparral ecosystem

T2 - DAYCENT modeling results

AU - Li, Xuyong

AU - Meixner, Thomas

AU - Sickman, James O.

AU - Miller, Amy E.

AU - Schimel, Joshua P.

AU - Melack, John M.

PY - 2006/2

Y1 - 2006/2

N2 - The Mediterranean climate, with its characteristic of dry summers and wet winters, influences the hydrologic and microbial processes that control carbon (C) and nitrogen (N) biogeochemical processes in chaparral ecosystems. These biogeochemical processes in turn determine N cycling under chronic N deposition. In order to examine connections between climate and N dynamics, we quantified decadal-scale water, C and N states and fluxes at annual, monthly and daily time steps for a California chaparral ecosystem in the Sierra Nevada using the DAYCENT model. The daily output simulations of net mineralization, stream flow and stream nitrate (NO3 -) export were developed for DAYCENT in order to simulate the N dynamics most appropriate for the abrupt rewetting events characteristic of Mediterranean chaparral ecosystems. Overall, the magnitude of annual modeled net N mineralization, soil and plant biomass C and N, nitrate export and gaseous N emission agreed with those of observations. Gaseous N emission was a major N loss pathway in chaparral ecosystems, in which nitric oxide (NO) is the dominant species. The modeled C and N fluxes of net primary production (NPP), N uptake and N mineralization, NO3 - export and gaseous N emission showed both high inter-annual and intra-annual variability. Our simulations also showed dramatic fire effects on NPP, N uptake, N mineralization and gaseous N emission for three years of postfire. The decease in simulated soil organic C and N storages was not dramatic, but lasted a longer time. For the seasonal pattern, the predicted C and N fluxes were greatest during December to March, and lowest in the summer. The model predictions suggested that an increase in the N deposition rate would increase N losses through gaseous N emission and stream N export in the chaparral ecosystems of the Sierra Nevada due to changes in N saturation status. The model predictions could not capture stream NO3 - export during most rewetting events suggesting that a dry-rewetting mechanism representing the increase in N mineralization following soil wetting needs to be incorporated into biogeochemical models of semi-arid ecosystems.

AB - The Mediterranean climate, with its characteristic of dry summers and wet winters, influences the hydrologic and microbial processes that control carbon (C) and nitrogen (N) biogeochemical processes in chaparral ecosystems. These biogeochemical processes in turn determine N cycling under chronic N deposition. In order to examine connections between climate and N dynamics, we quantified decadal-scale water, C and N states and fluxes at annual, monthly and daily time steps for a California chaparral ecosystem in the Sierra Nevada using the DAYCENT model. The daily output simulations of net mineralization, stream flow and stream nitrate (NO3 -) export were developed for DAYCENT in order to simulate the N dynamics most appropriate for the abrupt rewetting events characteristic of Mediterranean chaparral ecosystems. Overall, the magnitude of annual modeled net N mineralization, soil and plant biomass C and N, nitrate export and gaseous N emission agreed with those of observations. Gaseous N emission was a major N loss pathway in chaparral ecosystems, in which nitric oxide (NO) is the dominant species. The modeled C and N fluxes of net primary production (NPP), N uptake and N mineralization, NO3 - export and gaseous N emission showed both high inter-annual and intra-annual variability. Our simulations also showed dramatic fire effects on NPP, N uptake, N mineralization and gaseous N emission for three years of postfire. The decease in simulated soil organic C and N storages was not dramatic, but lasted a longer time. For the seasonal pattern, the predicted C and N fluxes were greatest during December to March, and lowest in the summer. The model predictions suggested that an increase in the N deposition rate would increase N losses through gaseous N emission and stream N export in the chaparral ecosystems of the Sierra Nevada due to changes in N saturation status. The model predictions could not capture stream NO3 - export during most rewetting events suggesting that a dry-rewetting mechanism representing the increase in N mineralization following soil wetting needs to be incorporated into biogeochemical models of semi-arid ecosystems.

KW - Carbon and nitrogen cycling

KW - Chaparral ecosystem

KW - DAYCENT

KW - Drying-rewetting pulse

KW - Fire disturbance

KW - Mediterranean-climate

KW - Nitrogen deposition

UR - http://www.scopus.com/inward/record.url?scp=32644454546&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=32644454546&partnerID=8YFLogxK

U2 - 10.1007/s10533-005-1391-z

DO - 10.1007/s10533-005-1391-z

M3 - Article

VL - 77

SP - 217

EP - 245

JO - Biogeochemistry

JF - Biogeochemistry

SN - 0168-2563

IS - 2

ER -