Response of a native perennial grass stand to disturbance in California's Coast Range Grassland

James W. Bartolome, Jeffrey Fehmi, Randall D. Jackson, Barbara Allen-Diaz

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

To assess the potential for enhancing an existing stand of native perennial grasses on a California Coast Range Grassland site, we experimentally manipulated the seasonal timing and presence of grazing for 3 years (1994 through 1996) and of autumn burning for 2 years (1994 and 1995) and measured species cover for 6 years (1993 through 1998). We subjected the species matrix to classification (TWINSPAN) and ordination (CCA) and tested the ordination site scores as well as diversity indices with linear mixed effects models. Four distinct plant community groups emerged from the classification. Two of these were dominated by annual grasses and two by perennial grasses. No treatment effects were observed on diversity. For composition, temporal and spatial random effects were important mixed effects model parameters, as was the fixed effect covariate, pre-treatment CCA site score, indicating the importance of random environmental variation and initial starting conditions. Incorporation of these random effects and initial condition terms made for more powerful tests of the fixed effects, grazing season, and burning. We found no significant burning effects. Grazing removal imparted a shift in plant community from more annual-dominated toward more perennial-dominated vegetation. Individual perennial grass species responded differently according to genus and species. Nassella spp. increased gradually over time regardless of grazing treatment. Nassella pulchra (purple needlegrass) increase was greatest under spring grazing and N. lepida (foothill needlegrass) was greatest with grazing removal. Danthonia californica (California oatgrass) had little response over time under seasonal grazing treatments, but increased with grazing removal. Under relatively mesic weather conditions it appears that grazing removal from Coast Range Grasslands with existing native perennial grass populations can increase their cover. However if N. pulchra is the sole existing population, spring season-restricted grazing should be equally effective at enhancing cover of the native grass species.

Original languageEnglish (US)
Pages (from-to)279-289
Number of pages11
JournalRestoration Ecology
Volume12
Issue number2
DOIs
StatePublished - Jun 2004
Externally publishedYes

Fingerprint

sward
rangelands
grazing
grassland
grass
disturbance
coasts
coast
grasses
ordination
plant community
plant communities
Nassella
Danthonia
taxonomy
TWINSPAN
effect
spring (season)
diversity index
weather

Keywords

  • Burning
  • Linear mixed effects models
  • Live-stock grazing
  • Native perennial grassland
  • Ordination
  • Restoration
  • TWINSPAN

ASJC Scopus subject areas

  • Ecology

Cite this

Response of a native perennial grass stand to disturbance in California's Coast Range Grassland. / Bartolome, James W.; Fehmi, Jeffrey; Jackson, Randall D.; Allen-Diaz, Barbara.

In: Restoration Ecology, Vol. 12, No. 2, 06.2004, p. 279-289.

Research output: Contribution to journalArticle

Bartolome, James W. ; Fehmi, Jeffrey ; Jackson, Randall D. ; Allen-Diaz, Barbara. / Response of a native perennial grass stand to disturbance in California's Coast Range Grassland. In: Restoration Ecology. 2004 ; Vol. 12, No. 2. pp. 279-289.
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