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- W39754231 abstract "Experiments that test interactive effects of multiple environmental factors should furnish the most realistic predictions of plant response to future environments. In this study, a fast growing species, loblolly pine (Pinus taeda), and a slow growing species, ponderosa pine (Pinus ponderosa), were compared for 160 days at two CO{sub 2} levels (35 Pa and 70Pa), two air temperatures (seasonal mean and seasonal mean +5 C), and two nitrogen treatments (1 mM NH{sub 4}NO{sub 3} and 5 mM NH{sub 4}NO{sub 3}) in the Duke University Phytotron. Biomass production was much greater in loblolly pine than in ponderosa pine but both species responded strongly to CO{sub 2} enrichment (p + 0.0001). In loblolly pine, there was a significant CO{sub 2} x Temperature interaction (p = 0.035) on biomass accumulation, where the 5 C increase in temperature inhibited growth in low CO{sub 2} (-13%) but stimulated growth in elevated CO{sub 2} (27%). Although growth of loblolly pine was significantly reduced by low N availability, there was not a CO{sub 2} x N interaction on biomass accumulation of loblolly pine suggesting that low N did not limit the response to CO{sub 2}. Biomass allocation of loblolly pine was affected by N and temperature; lowmore » N increased biomass allocation to roots (14%) and high temperature increased the ratio of stem mass to branch mass (30%). Neither temperature nor N had an effect on biomass accumulation or allocation of ponderosa pine. In ponderosa pine, elevated CO{sub 2} stimulated biomass allocation of roots (18%) and the ratio of branch mass to stem mass (62%). This study suggests that both pine species are sensitive to increases in atmospheric CO{sub 2} even in forests moderately low in soil N availability. Further, future warming may interact with elevated CO{sub 2} to stimulate biomass production of loblolly pine.« less" @default.
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- W39754231 date "1995-09-01" @default.
- W39754231 modified "2023-09-27" @default.
- W39754231 title "Responses of two Pinus species to varying atmospheric CO{sub 2}, air temperature and soil N availability" @default.
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