Net primary production of forests: a constant fraction of gross primary production?
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TLDR
The constancy of the NPP/GPP ratio supports the possibility of greatly simplifying forest growth models and provides an incentive to renew efforts to understand the environmental factors affecting partitioning of NPP above and belowground.Abstract:
Considerable progress has been made in our ability to model and measure annual gross primary production (GPP) by terrestrial vegetation. But challenges remain in estimating maintenance respiration (R(m)) and net primary production (NPP). To search for possible common relationships, we assembled annual carbon budgets from six evergreen and one deciduous forest in Oregon, USA, three pine plantations in New South Wales, Australia, a deciduous forest in Massachusetts, USA, and a Nothofagus forest on the South Island of New Zealand. At all 12 sites, a standard procedure was followed to estimate annual NPP of foliage, branches, stems, and roots, the carbon expended in synthesis of these organs (R(g)), their R(m), and that of previously produced foliage and sapwood in boles, branches, and large roots. In the survey, total NPP ranged from 120 to 1660 g C m(-2) year(-1), whereas the calculated fraction allocated to roots varied from 0.22 to 0.63. Comparative analysis indicated that the total NPP/GPP ratio was conservative (0.47 +/- 0.04 SD). This finding supports the possibility of greatly simplifying forest growth models. The constancy of the NPP/GPP ratio also provides an incentive to renew efforts to understand the environmental factors affecting partitioning of NPP above and belowground.read more
Citations
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Mechanisms of plant survival and mortality during drought: why do some plants survive while others succumb to drought?
Nate G. McDowell,William T. Pockman,Craig D. Allen,David D. Breshears,Neil S. Cobb,Thomas Kolb,Jennifer A. Plaut,John S. Sperry,Adam G. West,Adam G. West,David G. Williams,Enrico A. Yepez +11 more
TL;DR: A hydraulically based theory considering carbon balance and insect resistance that allowed development and examination of hypotheses regarding survival and mortality was developed, and incorporating this hydraulic framework may be effective for modeling plant survival andortality under future climate conditions.
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Gap filling strategies for defensible annual sums of net ecosystem exchange
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Improvements of the MODIS terrestrial gross and net primary production global data set
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Book Chapter
The Carbon Cycle and Atmospheric Carbon Dioxide
Iain Colin Prentice,Graham D. Farquhar,Mjr Fasham,Michael L. Goulden,Martin Heimann,VJ Jaramillo,Haroon S. Kheshgi,C. Le Quéré,Robert J. Scholes,D. W. R. Wallace +9 more
TL;DR: Contributing Authors D.R.A. Archer, M.M.P. Keeling, D.D.F. Weirig, T. Whorf, A.C. Sitch, R.J. Rayner, S.Q. Tans, H. Yool.
Journal ArticleDOI
The human footprint in the carbon cycle of temperate and boreal forests
Federico Magnani,Maurizio Mencuccini,Marco Borghetti,Paul Berbigier,Frank Berninger,Sylvain Delzon,Achim Grelle,Pertti Hari,Paul G. Jarvis,Pasi Kolari,Andrew S. Kowalski,Harry Lankreijer,Beverly E. Law,Anders Lindroth,Denis Loustau,Giovanni Manca,John Moncrieff,Mark Rayment,Vanessa Tedeschi,Riccardo Valentini,John Grace +20 more
TL;DR: It is shown that the temporal dynamics following stand-replacing disturbances do indeed account for a very large fraction of the overall variability in forest carbon sequestration, and that mankind is ultimately controlling the carbon balance of temperate and boreal forests.
References
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A generalised model of forest productivity using simplified concepts of radiation-use efficiency, carbon balance and partitioning
Joe Landsberg,Richard H. Waring +1 more
TL;DR: In this article, a stand growth model, called 3-PG (Use of Physiological Principles in Predicting Growth), calculates total carbon fixed (gross primary production; PG) from utilizable, absorbed photosynthetically active radiation (φp.a.u.), obtained by correcting the photosyntically active radiation absorbed by the forest canopy for the effects of soil drought, atmospheric vapour pressure deficits and stand age.
Journal ArticleDOI
A general model of forest ecosystem processes for regional applications I. Hydrologic balance, canopy gas exchange and primary production processes
TL;DR: In this paper, an ecosystem process model is described that calculates the carbon, water and nitrogen cycles through a forest ecosystem, which uses leaf area index (lai) to quantify the forest structure important for energy and mass exchange, and represents a key simplification for regional scale applications.
Journal ArticleDOI
Effects of Climate Change on Plant Respiration
TL;DR: Occurrence and control of the cyanide-resistant respiratory pathway and acclimation of respiration rates to different climates are poorly understood, but may substantially affect the reliability of model estimates of plant respiration.
Journal ArticleDOI
Exchange of Carbon Dioxide by a Deciduous Forest: Response to Interannual Climate Variability
TL;DR: The annual net uptake of CO2 by a deciduous forest in New England varied from 1.4 to 2.8 metric tons of carbon per hectare between 1991 and 1995 as mentioned in this paper.
Journal ArticleDOI
Belowground Carbon Allocation in Forest Ecosystems: Global Trends
TL;DR: In this paper, carbon allocation to roots in forest ecosystems is estimated from published data on soil respiration and litterfall, suggesting that above-and belowground production are controlled by the same factors.
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