Rare drought-induced mortality of juniper is enhanced by edaphic stressors and influenced by stand density

Matthew A Bowker, A. Muñoz, T. Martinez, M. K. Lau

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

During 2001-2003, a severe sub-continental drought resulted in a mortality event involving multiple woody plant species. Mass-mortality (up to 65% mortality in the locality studied) of the most drought resistant tree in the region, Juniperus monosperma (Engelm)Sarq., resulted in a conspicuously heterogeneous dieback pattern. Mortality was over three times greater in grassland landscapes compared to adjacent woodlands. We investigated the relative importance of biotic stressors (abundance of grass, tree density), edaphic stressors (soil texture), and climatic stressors (heat load) in determination of mortality. Using a multivariate modeling approach we separated the correlated edaphic and climatic influences, and determined that soil texture was the primary driver. We hypothesize that hydraulic failure in juniper was influenced by small-scale variation in matrix water potential (ψm). Density of tree stands also exerted an apparent competitive effect in grasslands and an apparent facilitative effect in woodlands. This study offers a rare glimpse of the extreme drought response of an anisohydric tree. The characteristics of sites with high juniper mortality may allow insight into the consequences of climate change impacts, enabling prediction of the types of sites which may be affected in the future.

Original languageEnglish (US)
Pages (from-to)9-16
Number of pages8
JournalJournal of Arid Environments
Volume76
Issue number1
DOIs
StatePublished - Jan 2012
Externally publishedYes

Fingerprint

stand density
drought
mortality
soil texture
woodland
grassland
woodlands
Juniperus monosperma
grasslands
mass mortality
dieback
woody plant
woody plants
water potential
grass
fluid mechanics
hydraulics
climate change
matrix
grasses

Keywords

  • Competition
  • Drought
  • Global change
  • Grassland-woodland transitions
  • Piñon-juniper woodlands

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Earth-Surface Processes
  • Ecology

Cite this

Rare drought-induced mortality of juniper is enhanced by edaphic stressors and influenced by stand density. / Bowker, Matthew A; Muñoz, A.; Martinez, T.; Lau, M. K.

In: Journal of Arid Environments, Vol. 76, No. 1, 01.2012, p. 9-16.

Research output: Contribution to journalArticle

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