1 / 10

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?

vida
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related