Question

They want to understand how P and S affect diversity and how they interact with other global change factors. 3. What rationale did the authors give for conducting this experiment? 4. What is the authors' research question? 5. What hypotheses are the authors testing? 6. What specific predictions do the authors make from their hypotheses? Materials and Methods 7. The authors had three different experiments. Compare and contrast the experimental design for the three experiments. 8. What dependent variable(s) did they measure? How did they measure it/them? Why did they measure so many different components? Why was this important? 9. What independent variable(s) did they manipulate? How did they do this? Did their approach seem appropriate? 10. What four functional groups did the authors select? How do these functional groups differ from one another? (Hint: think about this at many different scales) Results: Figure 1. 11. What do the bars show in the three graphs? What do the error bars represent? Why does Figure 1B not have error bars? 12. What is the difference between parts A, B, and C? 13. Does elevated CO2 and N production change plant biomass? How does this vary with number of species while standardizing for number of functional groups? Results: Figure 2. 14. What do the bars show in the three graphs? What do the error bars represent? Why does only Figure 2A have error bars? 15. What is the difference between parts A, B, and C? 16. Considering the number of functional groups, how does elevated CO2 and N production change plant biomass while the number of species remains the same? Inference 17. Which is more important to increase of plant biomass- species or functional richness? How do elevated CO2 and N contribute to these results?

They want to understand how P and S affect diversity and how they interact with other global change factors.
3. What rationale did the authors give for conducting this experiment?
4. What is the authors' research question?
5. What hypotheses are the authors testing?
6. What specific predictions do the authors make from their hypotheses?
Materials and Methods
7. The authors had three different experiments. Compare and contrast the experimental design for the three experiments.
8. What dependent variable(s) did they measure? How did they measure it/them? Why did they measure so many different components? Why was this important?
9. What independent variable(s) did they manipulate? How did they do this? Did their approach seem appropriate?
10. What four functional groups did the authors select? How do these functional groups differ from one another?
(Hint: think about this at many different scales)
Results: Figure 1.
11. What do the bars show in the three graphs? What do the error bars represent? Why does Figure 1B not have error bars?
12. What is the difference between parts A, B, and C?
13. Does elevated CO2 and N production change plant biomass? How does this vary with number of species while standardizing for number of functional groups?
Results: Figure 2.
14. What do the bars show in the three graphs? What do the error bars represent? Why does only Figure 2A have error bars?
15. What is the difference between parts A, B, and C?
16. Considering the number of functional groups, how does elevated CO2 and N production change plant biomass while the number of species remains the same?
Inference
17. Which is more important to increase of plant biomass- species or functional richness? How do elevated CO2 and N contribute to these results?

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