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Five Years with MELNHE: What have we learned about Multiple Element Limitation in Northern Hardwood Ecosystems
- 1. 3 sites: •Jeffers Brook •HBEF •BEF 2 stands per site: 1 mid-age 1 mature 9 stands at BEF: 3 young 3 mid-age 3 mature Multiple Element Limitation in Northern Hardwood Ecosystems
- 3. Five Years with MELNHE: What have we learned? LIMITATION Foliar N:P is in the colimitation range. Mature stands respond to P, young to N, in aboveground growth. NP no better. Adding N decreases soil respiration. No change with P addition. P decreases sap flow, Ca increases sap flow. Adding P increased microbial P, adding N decreased microbial N. Root biomass is increased by both N and P addition. INTERACTIONS N uptake by plants and/or microbes increases in response to P addition. Foliar N is reduced by P addition. MECHANISMS Foliar N and P resorption are increased by P and N additions, respectively. Roots forage for P when P is not added, grow more when N is added. Soil phosphatase is higher where N availability is high …rooting depth? AM/EM dominance? …
- 4. NLIMITATION PLIMITATION CHALLENGES TO BALANCED NUTRITION MECHANISMS FAVORING BALANCE P binding N fixation N deposition EM fungi enzymes shallow roots N resorption weathering tree allometry P fertilization N losses AM fungi enzymes deep roots P resorption N fertilization
Notas del editor
- Tim was going to be a key presenter in this session, but he had a bike accident two weeks ago, on June 28. The good news is that he went home from the hospital on Friday, and he’s back in business—mental function unimpaired, and we need him for this grant proposal. The bad news is that he has fractures in 6 ribs, his pelvis, and his shoulder blade. Please pick up one of these diamonds and write a note for Tim. We will assemble them to tile a plane and give it to him as a poster.
- Tim was going to be a key presenter in this session, but he had a bike accident two weeks ago, on June 28. The good news is that he went home from the hospital on Friday, and he’s back in business—mental function unimpaired, and we need him for this grant proposal. The bad news is that he has fractures in 6 ribs, his pelvis, and his shoulder blade. Please pick up one of these diamonds and write a note for Tim. We will assemble them to tile a plane and give it to him as a poster.
- Tim was going to be a key presenter in this session, but he had a bike accident two weeks ago, on June 28. The good news is that he went home from the hospital on Friday, and he’s back in business—mental function unimpaired, and we need him for this grant proposal. The bad news is that he has fractures in 6 ribs, his pelvis, and his shoulder blade. Please pick up one of these diamonds and write a note for Tim. We will assemble them to tile a plane and give it to him as a poster.