Researchers in the Multiple Element Limitation in Northern Hardwood Ecosystems (MELNHE) project are studying N and P acquisition and limitation through a series of nutrient manipulations in northern hardwood forests. This project is supported by the National Science Foundation, and builds upon the Northern Hardwood Forest Calcium Cycling Project, which established our sites at Bartlett. The project has also been called the Shoestring Project, during the period of unfunded effort between major research grants.
MELNHE
Although temperate forests are generally thought of as N-limited, resource optimization
theory predicts that ecosystem productivity should be co-limited by multiple nutrients.
These ideas are represented in the Multi-Element Limitation (MEL) model (Rastetter et al. 2012). To test the patterns of resource limitation predicted
by MEL, we are conducting nutrient manipulations in three study sites in the White
Mountain National Forest in New Hampshire: Bartlett Experimental Forest, Hubbard Brook
Experimental Forest, and Jeffers Brook.
At Bartlett, we have three replicate stands of three ages, young (clearcut 1985-1990),
mid-aged (clearcut 1975-1978), and mature (clearcut 1883-1890). At Hubbard Brook and
Jeffers Brook, we have stands that correspond to the mid-aged and mature stands at
Bartlett, for 4 more stands. Each of the 13 stands has four 1/4 ha (50 m x 50 m) treatment
plots, treated annually each spring beginning in 2011, with N (30 kg N/ha/yr as NH4NO3),
P (10 kg P/ha/yr as NaH2PO4), N+P, or nothing (an untreated control). Five stands
also have a Ca treatment plot (1150 kg Ca/ha in the form of CaSiO3).
We are monitoring stem diameter, leaf litter production and nutrient flux, foliar chemistry and nutrient resorption, canopy reflectance, sap flow, root biomass and production, mycorrhizal associations, soil respiration, soil N and P availability, N mineralization, soil phosphatase activity, soil carbon and nitrogen, and bird activity. See highlights below for our results to date!
MELNHE is led by 4 principal investigators...
- Tim Fahey, Cornell University, Ithaca, NY
- Melany Fisk, Miami University of Ohio, Oxford, OH
- Matthew Vadeboncoeur, University of New Hampshire, Durham, NH
- Ruth Yanai, SUNY College of Environmental Science and Forestry, Syracuse, NY
with a host of additional collaborators, including graduate students, technicians, undergraduate students, high school teachers and visiting scientists
Highlights
- Watch Jake Beidler's capstone, August 18, 2025
- 2025 Hubbard Brook Annual Cooperators' schedule and presentations July 9-10, 2025
- 15 years and STILL the longest-running N x P manipulation in a temperate forest ecosystem. Ruth Yanai (SUNY ESF)
- Life's a beech, and then you... treat it with phosphite. Sara Sternick (SUNY ESF)
- Experimental Setup for a New BLD Treatment Method. Alex Willard (Trinity)
- The plot thickens: Mapping ingrowth in the MELNHE stands. Sophie Eldridge (Wake Forest)
- N and P availability affects decomposition of sugar maple and beech leaves. Erica Albertson (SUNY ESF)
- You won't beleaf what's happening with soil respiration--it's not explained by litterfall. Shawn Quintal (Wheaton)
- Compliments to the nutrients: Root and fungal growth complementarity. Jenn Butt (Miami U)
- All highlights available here
For access contact forestecology@esf.edu