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Intro to the co-limitation study: synergistic effects of N+P

Intro to the co-limitation study: synergistic effects of N+P. Co-limitation. Elser et al. (2007) Ecology Letters. General Project Questions. Is productivity in the northern hardwood forest co-limited by N and P?

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Intro to the co-limitation study: synergistic effects of N+P

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  1. Intro to the co-limitation study: synergistic effects of N+P

  2. Co-limitation Elser et al. (2007) Ecology Letters

  3. General Project Questions Is productivity in the northern hardwood forest co-limited by N and P? Do mechanisms of resource optimization contribute to co-limitation in changing environments?

  4. Study Sites Mid-age forest Mature forest Young: 15-20 yrs Mid-age: 35-40 yrs Mature: 100+ yrs

  5. Study Sites 9 stands at BEF: 3 young 3 mid-age 3 mature 2 stands per site: 1 mid-age 1 mature • 3 sites: • Jeffers Brook • HBEF • BEF

  6. Study Sites 4 (sometimes 5) plots per stand

  7. Treatments Control P (10 kg/ha/yr) N+P N (30 kg/ha/yr) (And sometimes Ca)

  8. First year’s question Does excess of one nutrient influence the availability of the other? • Nutrient availability assayed with resin strips • 2 weeks after 2nd fertilization • Inserted in Oa horizon • Retrieved after 2 weeks

  9. Young Mid-age Mature Young Mid-age Mature

  10. Conclusions First year of treatment successfully elevated nutrient availability No evidence that adding one nutrient reduces availability of other Synergistic effect of N+P raised N availability We hypothesize that N+P reduced microbial allocation of N to phosphatase production

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