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- W2339654277 abstract "Small greenhouses were used in the arctic to maintain Erioporum vagina- tum-dominated tussock tundra for 10 wk at ambient CO2 (340 uL/L), elevated CO2 (5 1 0 or 680 gL/L), or elevated CO2 and 40C above ambient temperature (680 gL/L, am- bient + 4?). These treatments represent present levels of atmospheric CO2 and temperature, and those predicted for the next century. Within 3 wk, plants maintained at elevated CO2 exhibited a physiological adjustment of their photosynthetic rate so that plants grown at ambient and elevated CO2 levels had similar photosynthetic rates at their respective growth CO2 concentrations. The reduction in photosynthetic capacity for plants grown at elevated CO2 levels did not appear to be due to stomatal closure or end-product inhibition. Other possible mechanisms were not explored. Transpiration rates and water use efficiency did not differ among treatments in the generally wet environment of tussock tundra. Relative leaf growth rate and the seasonal pattern of growth were also unaltered, suggesting that the growth of mature tillers is not, under normal ambient conditions, limited by temperature or carbohydrate. However, new tiller production was significantly increased at elevated CO2, suggesting that the long-term effect of CO2 enhancement in this sedge may be the production of a greater number of new tillers rather than an increase in the size or pro- ductivity of existing tillers. Our results are consistent with the notion that growth of Eriophorum vaginatum in the field is more limited by nutrient supply than by photosyn- thesis. We further suggest that photosynthetic rates reflect the sink activity. It is therefore very difficult to assign cause and effect between growth rates and photosynthetic rates." @default.
- W2339654277 created "2016-06-24" @default.
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- W2339654277 date "1987-01-01" @default.
- W2339654277 modified "2023-09-27" @default.
- W2339654277 title "RESPONSE OF ERIOPHOR UM VAGINA TUM TO ELEVATED CO2 AND TEMPERATURE IN THE" @default.
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