Piñon pine (Pinus edulis Engelm.) growth responses to climate and substrate in southern Utah, U.S.A.

Nichole N. Barger, Connie Woodhouse

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Piñon pines (Pinus edulis Engelm.) are a widely distributed species across the western United States (U.S.) providing habitat for wildlife species in addition to forest products for humans. Thus, understanding factors that promote the productivity of this species is important to predict future responses to environmental change. We examined piñon pine growth from tree-ring records and evaluated whether growth responses to climate may be explained by local site characteristics such as geologic substrate from the late 1900s through the early 2000s. Cluster analysis revealed two distinct clusters that differed in their growth response (i.e., tree-ring width) to July temperature of the current growing season (cluster 1, r = −0.45; cluster 2, r = −0.31). Clusters 1 and 2 displayed synchronous growth throughout the early to mid-twentieth century but growth patterns diverged in the 1970s. Ring widths in cluster 1, which were most sensitive to average July temperature, showed a downward trend in the 1970s through the 2000s. By contrast, cluster 2 growth showed positive growth responses during the 1980s followed by growth declines during the multi-year drought of the 1990s. There was evidence that these growth patterns may be partially explained by geologic substrate (i.e., shale, sandstone, alluvial fan). Pearson’s r values of tree growth over time were strongly negative on shales and sandstones (r = −0.30, P = 0.009; r = −0.34, P = 0.003), whereas those on alluvial fans were not significant (r = 0.13, P = 0.23). Reported values of soil available water capacity on the shale and sandstone substrates are low relative to the alluvial fans, which may partially explain the differential growth responses. Our findings suggest that consideration of increasing summer temperatures on low availability water capacity geologic substrates may be important in predicting future piñon pine growth declines.

Original languageEnglish (US)
Pages (from-to)913-923
Number of pages11
JournalPlant Ecology
Volume216
Issue number7
DOIs
StatePublished - May 9 2015

Fingerprint

Pinus edulis
sandstone
growth response
shale
growth rings
climate
substrate
available water capacity
temperature
wildlife habitats
alluvial fan
forest products
Western United States
tree growth
cluster analysis
Pinus
tree ring
drought
growing season
summer

Keywords

  • Climate
  • Piñon pine
  • Soil water
  • Tree growth
  • Tree ring

ASJC Scopus subject areas

  • Ecology
  • Plant Science

Cite this

Piñon pine (Pinus edulis Engelm.) growth responses to climate and substrate in southern Utah, U.S.A. / Barger, Nichole N.; Woodhouse, Connie.

In: Plant Ecology, Vol. 216, No. 7, 09.05.2015, p. 913-923.

Research output: Contribution to journalArticle

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abstract = "Pi{\~n}on pines (Pinus edulis Engelm.) are a widely distributed species across the western United States (U.S.) providing habitat for wildlife species in addition to forest products for humans. Thus, understanding factors that promote the productivity of this species is important to predict future responses to environmental change. We examined pi{\~n}on pine growth from tree-ring records and evaluated whether growth responses to climate may be explained by local site characteristics such as geologic substrate from the late 1900s through the early 2000s. Cluster analysis revealed two distinct clusters that differed in their growth response (i.e., tree-ring width) to July temperature of the current growing season (cluster 1, r = −0.45; cluster 2, r = −0.31). Clusters 1 and 2 displayed synchronous growth throughout the early to mid-twentieth century but growth patterns diverged in the 1970s. Ring widths in cluster 1, which were most sensitive to average July temperature, showed a downward trend in the 1970s through the 2000s. By contrast, cluster 2 growth showed positive growth responses during the 1980s followed by growth declines during the multi-year drought of the 1990s. There was evidence that these growth patterns may be partially explained by geologic substrate (i.e., shale, sandstone, alluvial fan). Pearson’s r values of tree growth over time were strongly negative on shales and sandstones (r = −0.30, P = 0.009; r = −0.34, P = 0.003), whereas those on alluvial fans were not significant (r = 0.13, P = 0.23). Reported values of soil available water capacity on the shale and sandstone substrates are low relative to the alluvial fans, which may partially explain the differential growth responses. Our findings suggest that consideration of increasing summer temperatures on low availability water capacity geologic substrates may be important in predicting future pi{\~n}on pine growth declines.",
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