Woody plant proliferation in North American drylands

A synthesis of impacts on ecosystem carbon balance

Nichole N. Barger, Steve Archer, John L. Campbell, Cho Ying Huang, Jeffery A. Morton, Alan K. Knapp

Research output: Contribution to journalArticle

124 Citations (Scopus)

Abstract

Changes in the magnitude and direction of ecosystem carbon (C) balance accompanying woody plant encroachment are among the largest contributors to the uncertainty in the North American C budget. In this synthesis we identify the important species contributing to woody encroachment, summarize our current knowledge of aboveground and belowground C storage change with woody encroachment, and evaluate the range of human and natural disturbance factors that alter the course of C gains and losses within ecosystems experiencing woody encroachment. Available data indicate that relative to the historic vegetation, aboveground net primary production (ANPP) decreases with woody plant encroachment in arid regions (mean annual precipitation (MAP) < 336 mm), but increases in semiarid and subhumid regions (on the order of 0.7 g C m -2 yr-1 per mm of MAP over 336 mm). Soil organic carbon response to woody plant encroachment ranged from losses of 6200 g C m -2 to gains of 2700 g C m-2 with an average accumulation of 385 g C m-2 across all studies and did not appear to be closely coupled to ANPP. Taken together, in the absence of disturbance, woody encroachment appears to result in a net ecosystem C gain across most species and ecoregions. However, disturbance associated with wildfire, land management practices, and drought may quickly and significantly offset these gains and should be explicitly factored into regional-scale C balance estimates. Our findings may be used to better constrain future estimates of woody plant encroachment influences on the North American C budget.

Original languageEnglish (US)
Article numberG00K07
JournalJournal of Geophysical Research: Space Physics
Volume116
Issue number3
DOIs
StatePublished - 2011

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carbon balance
ecosystems
woody plant
woody plants
arid lands
Ecosystems
Carbon
synthesis
disturbances
carbon
ecosystem
net primary production
disturbance
budgets
primary productivity
Arid regions
land management
Drought
Organic carbon
drought

ASJC Scopus subject areas

  • Soil Science
  • Forestry
  • Water Science and Technology
  • Palaeontology
  • Atmospheric Science
  • Aquatic Science
  • Ecology

Cite this

Woody plant proliferation in North American drylands : A synthesis of impacts on ecosystem carbon balance. / Barger, Nichole N.; Archer, Steve; Campbell, John L.; Huang, Cho Ying; Morton, Jeffery A.; Knapp, Alan K.

In: Journal of Geophysical Research: Space Physics, Vol. 116, No. 3, G00K07, 2011.

Research output: Contribution to journalArticle

Barger, Nichole N. ; Archer, Steve ; Campbell, John L. ; Huang, Cho Ying ; Morton, Jeffery A. ; Knapp, Alan K. / Woody plant proliferation in North American drylands : A synthesis of impacts on ecosystem carbon balance. In: Journal of Geophysical Research: Space Physics. 2011 ; Vol. 116, No. 3.
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