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Simulated global environmental changes impact plant diversity

rsity as did adding nitrogen. More water increased plant diversity and, warming alone had no effect," Zavaleta explained. The four treatment combinations that represent likely possible futures all resulted in decreased wildflower diversity; but total diversity was not affected because there was an increase in the grasses. The largest loss of wildflower diversity came with elevated CO2 plus warming and nitrogen pollution, and all four of the factors combined. "Given the importance of the wildflower species for wildlife, nutrient cycling, and natural beauty, the losses under realistic global changes are a cause for concern," said Zavaleta.

Field emphasized: "Over the last century we have witnessed an 30% increase in atmospheric CO2 , an overall global warming of about 1 F, increases in nitrogen pollution from human activities, and changes in rainfall patterns. We are in the process of determining how the interactions among these components are affecting the health of the planet. This study and others like it at Global Ecology can provide some sorely needed answers."


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Contact: Chris Field
cfield@globalecology.stanford.edu
650-325-1521 x 213
Carnegie Institution
16-Jun-2003


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