Effects of nitrogen deposition and insect herbivory on patterns of ecosystem-level carbon and nitrogen dynamics: Results from the CENTURY model

Heather Throop, Elisabeth A. Holland, William J. Parton, Dennis S. Ojima, Cynthia A. Keough

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Atmospheric nitrogen deposition may indirectly affect ecosystems through deposition-induced changes in the rates of insect herbivory. Plant nitrogen (N) status can affect the consumption rates and population dynamics of herbivorous insects, but the extent to which N deposition-induced changes in herbivory might lead to changes in ecosystem-level carbon (C) and N dynamics is unknown. We created three insect herbivory functions based on empirical responses of insect consumption and population dynamics to changes in foliar N and implemented them into the CENTURY model. We modeled the responses of C and N storage patterns and flux rates to N deposition and insect herbivory in an herbaceous system. Results from the model indicate that N deposition caused a strong increase in plant production, decreased plant C: N ratios, increased soil organic C (SOC), and enhanced rates of N mineralization. In contrast, herbivory decreased both vegetative and SOC storage and depressed N mineralization rates. The results suggest that herbivory plays a particularly important role in affecting ecosystem processes by regulating the threshold value of N deposition at which ecosystem C storage saturates; C storage saturated at lower rates of N deposition with increasing intensity of herbivory. Differences in the results among the modeled insect herbivory functions suggests that distinct physiological and population response of insect herbivores can have a large impact on ecosystem processes. Including the effects of herbivory in ecosystem studies, particularly in systems where rates of herbivory are high and linked to plant C: N, will be important in generating accurate predictions of the effects of atmospheric N deposition on ecosystem C and N dynamics.

Original languageEnglish (US)
Pages (from-to)1092-1105
Number of pages14
JournalGlobal Change Biology
Volume10
Issue number7
DOIs
StatePublished - Jul 2004
Externally publishedYes

Fingerprint

herbivory
Ecosystems
Nitrogen
Carbon
insect
ecosystem
nitrogen
carbon
Population dynamics
organic soil
population dynamics
Soils
effect
mineralization
rate
Fluxes
herbivore
prediction

Keywords

  • Carbon cycle
  • CENTURY model
  • Herbivory
  • Nitrogen deposition
  • SOC

ASJC Scopus subject areas

  • Environmental Science(all)
  • Ecology
  • Environmental Chemistry
  • Global and Planetary Change

Cite this

Effects of nitrogen deposition and insect herbivory on patterns of ecosystem-level carbon and nitrogen dynamics : Results from the CENTURY model. / Throop, Heather; Holland, Elisabeth A.; Parton, William J.; Ojima, Dennis S.; Keough, Cynthia A.

In: Global Change Biology, Vol. 10, No. 7, 07.2004, p. 1092-1105.

Research output: Contribution to journalArticle

Throop, Heather ; Holland, Elisabeth A. ; Parton, William J. ; Ojima, Dennis S. ; Keough, Cynthia A. / Effects of nitrogen deposition and insect herbivory on patterns of ecosystem-level carbon and nitrogen dynamics : Results from the CENTURY model. In: Global Change Biology. 2004 ; Vol. 10, No. 7. pp. 1092-1105.
@article{d090f2760c7442189658d09d1d17fa1b,
title = "Effects of nitrogen deposition and insect herbivory on patterns of ecosystem-level carbon and nitrogen dynamics: Results from the CENTURY model",
abstract = "Atmospheric nitrogen deposition may indirectly affect ecosystems through deposition-induced changes in the rates of insect herbivory. Plant nitrogen (N) status can affect the consumption rates and population dynamics of herbivorous insects, but the extent to which N deposition-induced changes in herbivory might lead to changes in ecosystem-level carbon (C) and N dynamics is unknown. We created three insect herbivory functions based on empirical responses of insect consumption and population dynamics to changes in foliar N and implemented them into the CENTURY model. We modeled the responses of C and N storage patterns and flux rates to N deposition and insect herbivory in an herbaceous system. Results from the model indicate that N deposition caused a strong increase in plant production, decreased plant C: N ratios, increased soil organic C (SOC), and enhanced rates of N mineralization. In contrast, herbivory decreased both vegetative and SOC storage and depressed N mineralization rates. The results suggest that herbivory plays a particularly important role in affecting ecosystem processes by regulating the threshold value of N deposition at which ecosystem C storage saturates; C storage saturated at lower rates of N deposition with increasing intensity of herbivory. Differences in the results among the modeled insect herbivory functions suggests that distinct physiological and population response of insect herbivores can have a large impact on ecosystem processes. Including the effects of herbivory in ecosystem studies, particularly in systems where rates of herbivory are high and linked to plant C: N, will be important in generating accurate predictions of the effects of atmospheric N deposition on ecosystem C and N dynamics.",
keywords = "Carbon cycle, CENTURY model, Herbivory, Nitrogen deposition, SOC",
author = "Heather Throop and Holland, {Elisabeth A.} and Parton, {William J.} and Ojima, {Dennis S.} and Keough, {Cynthia A.}",
year = "2004",
month = "7",
doi = "10.1111/j.1529-8817.2003.00791.x",
language = "English (US)",
volume = "10",
pages = "1092--1105",
journal = "Global Change Biology",
issn = "1354-1013",
publisher = "Wiley-Blackwell",
number = "7",

}

TY - JOUR

T1 - Effects of nitrogen deposition and insect herbivory on patterns of ecosystem-level carbon and nitrogen dynamics

T2 - Results from the CENTURY model

AU - Throop, Heather

AU - Holland, Elisabeth A.

AU - Parton, William J.

AU - Ojima, Dennis S.

AU - Keough, Cynthia A.

PY - 2004/7

Y1 - 2004/7

N2 - Atmospheric nitrogen deposition may indirectly affect ecosystems through deposition-induced changes in the rates of insect herbivory. Plant nitrogen (N) status can affect the consumption rates and population dynamics of herbivorous insects, but the extent to which N deposition-induced changes in herbivory might lead to changes in ecosystem-level carbon (C) and N dynamics is unknown. We created three insect herbivory functions based on empirical responses of insect consumption and population dynamics to changes in foliar N and implemented them into the CENTURY model. We modeled the responses of C and N storage patterns and flux rates to N deposition and insect herbivory in an herbaceous system. Results from the model indicate that N deposition caused a strong increase in plant production, decreased plant C: N ratios, increased soil organic C (SOC), and enhanced rates of N mineralization. In contrast, herbivory decreased both vegetative and SOC storage and depressed N mineralization rates. The results suggest that herbivory plays a particularly important role in affecting ecosystem processes by regulating the threshold value of N deposition at which ecosystem C storage saturates; C storage saturated at lower rates of N deposition with increasing intensity of herbivory. Differences in the results among the modeled insect herbivory functions suggests that distinct physiological and population response of insect herbivores can have a large impact on ecosystem processes. Including the effects of herbivory in ecosystem studies, particularly in systems where rates of herbivory are high and linked to plant C: N, will be important in generating accurate predictions of the effects of atmospheric N deposition on ecosystem C and N dynamics.

AB - Atmospheric nitrogen deposition may indirectly affect ecosystems through deposition-induced changes in the rates of insect herbivory. Plant nitrogen (N) status can affect the consumption rates and population dynamics of herbivorous insects, but the extent to which N deposition-induced changes in herbivory might lead to changes in ecosystem-level carbon (C) and N dynamics is unknown. We created three insect herbivory functions based on empirical responses of insect consumption and population dynamics to changes in foliar N and implemented them into the CENTURY model. We modeled the responses of C and N storage patterns and flux rates to N deposition and insect herbivory in an herbaceous system. Results from the model indicate that N deposition caused a strong increase in plant production, decreased plant C: N ratios, increased soil organic C (SOC), and enhanced rates of N mineralization. In contrast, herbivory decreased both vegetative and SOC storage and depressed N mineralization rates. The results suggest that herbivory plays a particularly important role in affecting ecosystem processes by regulating the threshold value of N deposition at which ecosystem C storage saturates; C storage saturated at lower rates of N deposition with increasing intensity of herbivory. Differences in the results among the modeled insect herbivory functions suggests that distinct physiological and population response of insect herbivores can have a large impact on ecosystem processes. Including the effects of herbivory in ecosystem studies, particularly in systems where rates of herbivory are high and linked to plant C: N, will be important in generating accurate predictions of the effects of atmospheric N deposition on ecosystem C and N dynamics.

KW - Carbon cycle

KW - CENTURY model

KW - Herbivory

KW - Nitrogen deposition

KW - SOC

UR - http://www.scopus.com/inward/record.url?scp=3242656129&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=3242656129&partnerID=8YFLogxK

U2 - 10.1111/j.1529-8817.2003.00791.x

DO - 10.1111/j.1529-8817.2003.00791.x

M3 - Article

AN - SCOPUS:3242656129

VL - 10

SP - 1092

EP - 1105

JO - Global Change Biology

JF - Global Change Biology

SN - 1354-1013

IS - 7

ER -