An Ecosystem Model of Carbon, Nitrogen and Water Balances in Forests
Entry ID: EOSWEBSTER_PnET_Ecosystem_Model

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Summary
Abstract: PnET (net photosynthesis / evapotranspiration) is a nested series of
models of carbon (C), water and nitrogen dynamics in forest
ecosystems. The models can be used to predict transient responses in
net primary production (NPP), carbon and water balances, net N
mineralization and nitrification and N leaching losses, resulting from
changes in climate, N deposition, troposheric ozone and land use as
well as variation in species composition. The models use generalized
representations of physiological and ecosystem processes and were
designed to be run with relatively few input parameters that require
no calibration. At the core of each version is a multi-layered canopy
model of phenology and photosynthesis (PnET-Day) that was designed to
simulate daily canopy carbon exchange.
The PnET-II model is a canopy- to stand-level model of monthly
carbon and water balances for temperate and boreal forest ecosystems.
Central to the model are relationships between foliar nitrogen and
maximum leaf photosynthesis, and between actual photosynthesis and
stomatal conductance. Together, these provide a link between the
carbon and water balance portions of the model in that transpiration
is determined as a function of canopy photosynthesis. The model has
been applied and validated regionally in the northeastern US and
elsewhere using input parameters that reflect typical deciduous and
coniferous forests. PnET-II outputs include annual net primary
productivity (NPP), wood production and runoff under current and
climate change conditions (+6 degrees C, -15% precipitation and 2X
CO2). Climate change predictions are presented as ratios of future to
current values.

The PnET-CN model adds live biomass, litter and soil organic matter
compartments to the structure of PnET-II and simulates temporal
changes in both plant and soil C and N pools. Nitrogen is included in
all compartments and fluxes, as well as N mineralization and
nitrification, plant N uptake and leaching losses to produce complete
cycles for water, carbon and nitrogen. Canopy and soil processes
interact through C:N ratios in foliage and litter. Foliar N
concentrations vary with the availability of C and N in plants. Tissue
C:N ratios are reflected in litter, and high C/N ratios decrease net N
mineralization. PnET-CN can be applied transiently where site history
information is available. PnET-CN outputs presented here are regional
predictions of equilibrium N cycling.

Related URL
Link: VIEW RELATED INFORMATION
Description: Pnet model journal articles, PnET source code, PnET executable.


This data set description is a member of a collection. Click to see members of this collection.

Geographic Coverage
 N: 48.0 S: 38.0  E: -66.0  W: -77.0

Data Set Citation
Dataset Originator/Creator: John D. Aber, Charles T. Driscoll
Dataset Title: Effects of land use, climate variation and N deposition on N cyclign and C storage on northern hardwood forests
Dataset Release Date: 1997
Dataset Publisher: Global Biogeochemical cycles (1997) 11(4) pp 639-648
Data Presentation Form: ASCII and image

Dataset Originator/Creator: John D. Aber,Scott V. Ollinger, C. Anthony Federer, Peter B. Reich, Michael L. Goulden, David W. Kicklighter, Jerry M. Melillo, Richard G. Lathrop Jr.
Dataset Title: Predicting the Effects of Climate Change on water yield and Forest Production in the Northeastern United States
Dataset Release Date: 1995
Dataset Publisher: Climate Research
Data Presentation Form: ASCII and image

Dataset Originator/Creator: John D. Aber
Dataset Title: An Ecosystem Model of Carbon, Nitrogen and Water Balances in Forests
Dataset Release Date: 1999
Dataset Release Place: Durham, NH, USA
Dataset Publisher: CSRC, University of New Hampshire
Data Presentation Form: ASCII and image
Online Resource: http://eos-earthdata.sr.unh.edu/

Dataset Originator/Creator: John D. Aber, Peter B. Reich, Michael L. Goulden
Dataset Title: Extrapolating leaf CO2 exchange to the canopy: a generalized model
Dataset Release Date: 1996
Dataset Publisher: Oecologia (1996) 106: 257-265
Data Presentation Form: ASCII and image


Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > Northeastern United States


Science Keywords
ATMOSPHERE >PRECIPITATION >PRECIPITATION AMOUNT    [Definition]
BIOSPHERE >VEGETATION >BIOMASS    [Definition]
BIOSPHERE >VEGETATION >CARBON    [Definition]
HUMAN DIMENSIONS >ENVIRONMENTAL GOVERNANCE/MANAGEMENT >LAND MANAGEMENT >LAND USE CLASSES    [Definition]
TERRESTRIAL HYDROSPHERE >SURFACE WATER >RUNOFF    [Definition]
LAND SURFACE >LAND USE/LAND COVER >LAND USE CLASSES    [Definition]
BIOSPHERE >VEGETATION >PLANT PHENOLOGY    [Definition]
ATMOSPHERE >ATMOSPHERIC CHEMISTRY >NITROGEN COMPOUNDS >MOLECULAR NITROGEN    [Definition]
BIOSPHERE >ECOLOGICAL DYNAMICS >ECOSYSTEM FUNCTIONS >BIOGEOCHEMICAL CYCLES    [Definition]
BIOSPHERE >ECOLOGICAL DYNAMICS >ECOSYSTEM FUNCTIONS >PRIMARY PRODUCTION    [Definition]


ISO Topic Category
BIOTA
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Project
ESIP >Earth Science Information Partners Program    [Information]


Keywords
ATMOSPHERIC DEPOSITION
CARBON BUDGET
CLIMATE CHANGE
CLIMCALC
FOREST COVER
LANDUSE
NET ECOSYSTEM PRODUCTIVITY
PNET
SULFUR
WATER BALANCE
TEMS
GTOS
G3OS


Data Set Progress
IN WORK


Data Center
EOS-EARTHDATA, Complex Systems Research Center, Institute for the Study of Earth, Oceans, and Space, Univ. of New Hampshire    [Information]
Data Center URL: http://eos-earthdata.sr.unh.edu/

Data Center Personnel
Name: EARTH SYSTEMS RESEARCH CENTER
Phone: 1-603-862-3785
Fax: 603-862-0188
Email: eosearthdatasupport at foghorn.sr.unh.edu
Contact Address:
Complex Systems Research Center
Institute for the Study of Earth, Oceans, and Space
Morse Hall
University of New Hampshire
City: Durham
Province or State: New Hampshire
Postal Code: 03824
Country: USA



Distribution
Distribution_Media: CD-ROM, online WWW download
Distribution_Format: ASCII, GIF images
Fees: None


Personnel
JOHN D. ABER
Role: INVESTIGATOR
Phone: 603-862-3045
Email: John.Aber at unh.edu
Contact Address:
University of New Hampshire
Complex Systems Research Center
City: Durham
Province or State: NH
Postal Code: 03824
Country: USA


ANNETTE SCHLOSS
Role: TECHNICAL CONTACT
Phone: 603-862-0348
Fax: 603-862-0188
Email: annette.schloss at unh.edu
Contact Address:
Complex Systems Research Center
Morse Hall
University of New Hampshire
City: Durham
Province or State: New Hampshire
Postal Code: 03824
Country: USA


RITA FREUDER
Role: DIF AUTHOR
Phone: 603-862-1792
Fax: 603-862-0188
Email: Rita.Freuder at unh.edu
Contact Address:
Complex Systems Research Center
Institute for the Study of Earth, Oceans, and Space
Morse Hall
University of New Hampshire
City: Durham
Province or State: New Hampshire
Postal Code: 03824
Country: USA



Creation and Review Dates
Last DIF Revision Date: 2013-08-09

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