Desertification alters patterns of aboveground net primary production in Chihuahuan ecosystems

Laura F Huenneke, John P. Anderson, Marta Remmenga, William H. Schlesinger

Research output: Contribution to journalArticle

164 Citations (Scopus)

Abstract

The Chihuahuan desert of New Mexico, USA, has changed in historical times from semiarid grassland to desert shrublands dominated by Larrea tridentata and Prosopis glandulosa. Similar displacement of perennial grasslands by shrubs typifies desertification in many regions. Such structural vegetation change could alter average values of net primary productivity, as well as spatial and temporal patterns of production. We investigated patterns of aboveground plant biomass and net primary production in five ecosystem types of the Jornada Basin Long-Term Ecological Research (LTER) site. Comparisons of shrub-dominated desertified system and remnant grass-dominated systems allowed us to test the prediction that shrublands are more heterogeneous spatially, but less variable over time, than grasslands. We measured aboveground plant biomass and aboveground net primary productivity (ANPP) by species, three times per year for 10 years, in 15 sites of five ecosystem types (three each in Larrea shrubland, Bouteloua eriopoda grassland, Prosopis dune systems, Flourensia cernua alluvial flats, and grass-dominated dry lakes or playas). Spatial heterogeneity of biomass at the scale of our measurements was significantly greater in shrub-dominated systems than in grass-dominated vegetation. ANPP was homogeneous across space in grass-dominated systems, and in most growing seasons was significantly more patchy in shrub vegetation. Substantial interannual variability in ANPP complicates comparison of mean values across ecosystem types, but grasslands tended to support higher ANPP values than did shrub-dominated systems. There were significant interactions between ecosystem type and season. Grassland demonstrated higher interannual variation than did shrub systems. Desertification has apparently altered the seasonality of productivity in these systems; grasslands were dominated by summer growth, while sites dominated by Larrea or Prosopis tended to have higher spring ANPP. Production was frequently uncorrelated across sites of an ecosystem type, suggesting that factors other than season, regional climate, or dominant vegetation may be significant determinants of actual NPP.

Original languageEnglish (US)
Pages (from-to)247-264
Number of pages18
JournalGlobal Change Biology
Volume8
Issue number3
DOIs
StatePublished - 2002
Externally publishedYes

Fingerprint

net primary production
desertification
Ecosystems
Productivity
grassland
shrub
productivity
ecosystem
shrubland
grass
Biomass
vegetation
biomass
desert
playa
regional climate
annual variation
seasonality
Lakes
dune

Keywords

  • Chihuahuan desert
  • Desertification
  • Jornada LTER
  • Larrea tridentata
  • Net primary
  • Productivity
  • Prosopis glandulosa

ASJC Scopus subject areas

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

Cite this

Desertification alters patterns of aboveground net primary production in Chihuahuan ecosystems. / Huenneke, Laura F; Anderson, John P.; Remmenga, Marta; Schlesinger, William H.

In: Global Change Biology, Vol. 8, No. 3, 2002, p. 247-264.

Research output: Contribution to journalArticle

Huenneke, Laura F ; Anderson, John P. ; Remmenga, Marta ; Schlesinger, William H. / Desertification alters patterns of aboveground net primary production in Chihuahuan ecosystems. In: Global Change Biology. 2002 ; Vol. 8, No. 3. pp. 247-264.
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