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ELEVATED CO 2 AND TEMPERATURE ALTER THE RESPONSE OF PINUS PONDEROSA TO OZONE: A SIMULATION ANALYSIS
Author(s) -
Tingey David T.,
Laurence John A.,
Weber James A.,
Greene Joseph,
Hogsett William E.,
Brown Sandra,
Henry Lee E.
Publication year - 2001
Publication title -
ecological applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.864
H-Index - 213
eISSN - 1939-5582
pISSN - 1051-0761
DOI - 10.1890/1051-0761(2001)011[1412:ecatat]2.0.co;2
Subject(s) - environmental science , biomass (ecology) , atmospheric sciences , precipitation , ozone , pinus <genus> , ecology , limiting , climatology , biology , botany , geography , meteorology , mechanical engineering , geology , engineering
We investigated the potential impact of projected future temperature and CO 2 concentrations in combination with tropospheric O 3 on the annual biomass increment of Pinus ponderosa Doug. ex Laws. TREGRO, a process‐based whole‐tree growth model in which trees experienced a seasonal drought, was used to study the interactions of CO 2 , temperature, and O 3 on tree growth along a latitudinal gradient in California, Oregon, and Washington, USA. The annual biomass increment increased in proportion to CO 2 concentration, although the magnitude varied among sites. Increasing air temperature (+1.3°C) increased growth at most sites. Elevated CO 2 increased the temperature optimum for growth at four sites and decreased it at two sites. The annual biomass increment decreased with increasing O 3 exposure. The differences in O 3 effects among sites were primarily controlled by differences in precipitation. Although increasing CO 2 can reduce the O 3 impact, it does not eliminate the impact of O 3 . Elevated CO 2 would enhance tree growth more if O 3 exposures were reduced, especially in the more polluted sites. The greatest benefit for tree growth would come from reducing O 3 exposures in the most polluted sites, but we must also consider locations that have high inherent O 3 sensitivity because of their mesic conditions. Limiting the increase of O 3 levels in those areas will also increase tree growth.