Comparison of Tree Species Sensitivity to High- and Low-Extreme Hydroclimatic Events
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Date
2001-03Author
Hidalgo León, Hugo G.
Dracup, John A.
MacDonald, Glen M.
King, Judith A.
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We present here a six-species comparison of tree-ring growth response to
extremes (below the 30th and above the 70th percentile) in temperature, precipitation,
and corresponding streamflow. The species compared are Pinus edulis (PIED), Pseudotsuga
menziesii (PSME), Pinus ponderosa (PIPO), Pinus flexilis (PIFL), Pinus aristata (PIAR),
and Picea engelmannii (PCEN). Sensitivity was determined using contingency scores
obtained by comparing tree-ring growth at different lags with hydroclimatic observations
from the Upper Colorado River Basin in the southwestern United States. The scores were
computed using dual scaling methods in which the higher scores are assigned to stronger
relationships between tree-ring growth and severe hydroclimatic occurrences. At lag 0,
PIED and PSME present the greatest sensitivity to severe streamflow events. For precipitation
and temperature the most sensitive species at lag 0 are PIED and PIPO. PIAR and
PCEN show no significant relationship with extreme hydroclimatic events. PIFL shows
more uniform lag-to-lag scores, suggesting a higher year-to-year persistence for this species.
In general, tree-ring growth for all sensitive species is more responsive to hot-dry than
to cool-moist extreme conditions. The scoring method proposed in this study for the analysis
of tree-ring records proved to be a useful tool for evaluating ring-width sensitivity to
extreme climatic forcing.
External link to the item
10.1080/02723646.2001.10642733Collections
- Geología [155]