Modelling forest ecosystem net primary production: the hybrid simulation approach used in forecast

Kimmins, J. P.; Mailly, Daniel; Seely, Brad

doi:10.1016/s0304-3800(99)00138-6

Cited by 171 publications

(172 citation statements)

References 21 publications

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“…The current portfolio of advanced modeling techniques is wide and also focused on complex systems, so that hypothetical indications on future states of forest stands and landscapes can be actually provided over a wide range of conditions (e.g. García, 1994;Kimmins et al, 1999;Saltelli et al, 2000;O'Hara et al, 2001;Haeussler et al, 2013), and robust statistical tools, like e.g. Bayesian model averaging (e.g.…”

Section: The Issue Of Low Predictabilitymentioning

confidence: 99%

Managing forests in a changing world: the need for a systemic approach. A review

et al. 2017

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Aim of study: The paper is a scientific commented discussion with the aim of defining a framework which allows both a comprehensive vision of forest dynamics, as well as an adaptive management approach and policy procedures more suited to a changing and inherently unpredictable world.Main results: We identify the main challenges facing forestry in relation to recent developments in forestry thinking, i.e. the paradox of aiming at sustainability in a changing environment, a shifting perception of the relationship between ecological and social systems, the recognition of forest ecosystems as complex adaptive systems, the need for integrating the social and ecological dimensions of forestry into a single framework, and the growing awareness of the importance of the ethical approach to the forest. We propose the concept of "systemic forestry" as a paradigm for better understanding forest dynamics and for guiding management and public actions at various levels. We compare the systemic approach with different silvicultural and forest management approaches which have been proposed in the last decades.Research highlights: Our analysis shows that a systemic approach to forestry has five main consequences: 1. forestry is viewed as a part of landscape dynamics through a multi-sectoral coordination, 2. the logic of action changes from norm to process, 3. conservation is a dynamic search for resilience, 4. multi-functionality is achieved through a multi-entries approach integrating ecological, social and economic components of sustainability, 5. forestry institutions are reframed to address the issue of changing interactions among actors, 6. a change in the ethical approach to the forest is needed.

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Section: The Issue Of Low Predictabilitymentioning

confidence: 99%

Managing forests in a changing world: the need for a systemic approach. A review

et al. 2017

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“…Furthermore, leaching outputs will likely decrease as new stands become established, even if they do not reach the age of the original old-growth forests, from which an average of~ 0.03 kg -1 ha -1 leached over the growing season (1.4 kg ha -1 yr -1 in Feller et al 2000). However, both atmospheric deposition and N fixation would have taken place even if forests were not harvested, so caution must be used when considering whether additions from these sources would compensate for increased leaching losses after harvesting using a simple N budget rather than a process-based model (e.g., Kimmins et al 1999). The second main output is N in harvested logs, which was estimated to be ~ 250 kg ha -1 in a 400-year-old stand in the Coastal Western Hemlock zone and could hence be a much greater source of N loss than leaching at MASS, especially over the short-term.…”

Section: Relative Differences Between Og Swmentioning

confidence: 99%

Post-harvest nitrogen cycling in clearcut and alternative silvicultural systems in a montane forest in coastal British Columbia

Titus¹,

Prescott²,

Maynard³

et al. 2006

The Forestry Chronicle

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The MASS (Montane Alternative Silvicultural Systems) trial was established in the coastal mountains of British Columbia to compare clearcut, patch cut, green tree and shelterwood systems. A number of studies were carried out at the MASS trial to determine the extent to which these variable levels of stand retention retained old-growth attributes of N cycling and associated ecological processes. Harvesting led to increases in N mineralization in the forest floor (2ϫ) and mineral soil (10ϫ), and fluxes of N through the upper 25 cm of mineral soil (2ϫ to 3ϫ). However, fluxes of N were not large (< 0.35 kg ha -1 per growing season). Nitrogen mineralized was predominantly ammonium and not nitrate in the forest floor (> 95% in all but clearcut, > 75% in clearcut) and upper mineral soil horizon (42-86%). The nitrate component came from heterotrophic decomposition of organic matter, not conversion of ammonium to nitrate by autotrophs, and nitrate increases resulted from decreased gross nitrate consumption with harvesting, rather than increased nitrate production. The increases in soil N availability resulting from harvesting were reflected in only slight increases in seedling foliar N concentrations for two to four years after logging (peak of~ 2% for western hemlock and ~ 1.6% for amabilis fir) before decreasing to below deficiency thresholds for both species. Overall, estimated losses of N from the rooting zone after harvesting (1 kg ha -1 yr -1 ) were minimal in comparison to estimated N inputs (4 kg ha -1 yr -1 ), N exports in logs at harvesting (250 kg ha -1 ) and soil reserves (11 400 kg ha -1 ). Although unlikely to affect future site productivity, losses of N could be reduced somewhat through the use of shelterwood harvesting.

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“…Nevertheless, empirical and process models can be married into hybrid models in which the shortcomings of both approaches can be overcome to some extent. This is the rationale behind the hybrid simulation approach to forest growth and C dynamics modelling (Kimmins, 1993;Battaglia et al, 1999;Kimmins et al, 1999;Peng, 2000b). Specifically, incorporating the key elements of empirical and process approaches into a hybrid ecosystem modelling approach can result in a model that predicts forest growth, production and C dynamics in both the short and long term (Pastor and Post, 1988;Battaglia and Sands, 1998;Kimmins et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

TRIPLEX: a generic hybrid model for predicting forest growth and carbon and nitrogen dynamics

Peng

Liu

Dang

et al. 2002

Ecological Modelling

191

120

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Modelling forest ecosystem net primary production: the hybrid simulation approach used in forecast

Cited by 171 publications

References 21 publications

Managing forests in a changing world: the need for a systemic approach. A review

Managing forests in a changing world: the need for a systemic approach. A review

Post-harvest nitrogen cycling in clearcut and alternative silvicultural systems in a montane forest in coastal British Columbia

TRIPLEX: a generic hybrid model for predicting forest growth and carbon and nitrogen dynamics

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