Standards for Regeneration Establishment in Canada: A Case Study for Douglas-fir

David G. Brand; G. F. Weetman

doi:10.5558/tfc62084-2

Standards for Regeneration Establishment in Canada: A Case Study for Douglas-fir

The Forestry Chronicle ◽

10.5558/tfc62084-2 ◽

1986 ◽

Vol 62 (2) ◽

pp. 84-90 ◽

Cited By ~ 12

Author(s):

David G. Brand ◽

G. F. Weetman

Keyword(s):

Threshold Level ◽

Douglas Fir ◽

Projection Technique ◽

Tree Establishment ◽

Growth Standards ◽

Commercial Species

Most stresses and hazards affecting plantation success occur during the initial establishment period. Ensuring that new stands are fully stocked with commercial species, growing acceptably, and not likely to be suppressed by brush or damaged by insects and animals, are the goals of regeneration silviculture. To focus silviculture efforts, the concept of the free to grow plantation has evolved. This paper discusses proposed criteria for setting quantifiable, biologically-based free-to-grow standards. A case study using Douglas-fir (Pseudotsuga menziesil (Mirb.) Franco) illustrates how free-to-grow standards could be developed. The process first requires identification of the factor or stress limiting growth. Then, free-to-growth standards are based on defining a threshold level of the factor for successful tree establishment and applying a projection technique to estimate whether the trees currently below the threshold are in danger of exceeding it.

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Effectiveness of DFS Tuning on Java Server Workload

Journal of Circuits System and Computers ◽

10.1142/s0218126616400053 ◽

2015 ◽

Vol 25 (01) ◽

pp. 1640005 ◽

Cited By ~ 1

Author(s):

Hitoshi Oi

Keyword(s):

Power Consumption ◽

Sampling Period ◽

Threshold Level ◽

Load Level ◽

Clock Frequency ◽

Frequency Scaling ◽

Dynamic Frequency Scaling ◽

Maximum Reduction ◽

Dynamic Frequency

Dynamic frequency scaling (DFS) is a feature commonly found in modern processors. It lowers the clock frequency of a core according to the load level and reduces the power consumption. In this paper, we present a case study of tuning DFS parameters on a platform with an AMD Phenom II X6 using the SPECjEnterprise2010 (jEnt10) and SPECjbb2005 (jbb05) as the workload. In jEnt10, a longer sampling period of core utilization (up to 1.5[Formula: see text]s) reduced the power by 6[Formula: see text]Watt at 25% load level. At 50% load level, combining it with an increased threshold level (98%) to switch the clock frequency further reduced the power consumption by up to 10[Formula: see text]Watt. In jbb05, stretching the sampling period was only effective up to 0.5[Formula: see text]s. The maximum reduction was observed at around 60% load level. Raising the threshold level was not effective for jbb05.

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Genotype * environment interaction: a case study for Douglas-fir in western Oregon.

10.2737/pnw-rp-455 ◽

1992 ◽

Cited By ~ 2

Author(s):

Robert K. Campbell

Keyword(s):

Douglas Fir ◽

Environment Interaction ◽

Genotype Environment Interaction

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A method for deriving net primary productivity and component respiratory fluxes from tower-based eddy covariance data: a case study using a 17-year data record from a Douglas-fir chronosequence

Global Change Biology ◽

10.1111/j.1365-2486.2006.01298.x ◽

2007 ◽

Vol 13 (2) ◽

pp. 370-385 ◽

Cited By ~ 47

Author(s):

CHRISTOPHER R. SCHWALM ◽

T. ANDREW BLACK ◽

KAI MORGENSTERN ◽

ELYN R. HUMPHREYS

Keyword(s):

Eddy Covariance ◽

Primary Productivity ◽

Net Primary Productivity ◽

Douglas Fir ◽

Data Record

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Multiple equilibria, soil conservation investments, and the resilience of agricultural systems

Environment and Development Economics ◽

10.1017/s1355770x06003056 ◽

2006 ◽

Vol 11 (4) ◽

pp. 477-492 ◽

Cited By ~ 34

Author(s):

JOHN M. ANTLE ◽

JETSE J. STOORVOGEL ◽

ROBERTO O. VALDIVIA

Keyword(s):

Soil Conservation ◽

Soil Degradation ◽

Multiple Equilibria ◽

Threshold Level ◽

Agricultural Systems ◽

Agricultural Areas ◽

Conservation Investment ◽

Positive Return ◽

Conservation Technologies

This paper provides a new explanation for the persistent land degradation in some parts of the world, despite the availability of seemingly effective soil conservation technologies. We demonstrate that soil conservation technologies may induce agricultural systems to exhibit equilibria characterized by both low and high levels of soil degradation. These two equilibria are separated by a threshold level of soil degradation beyond which a conservation investment will not yield a positive return. Once a parcel of land crosses this productivity threshold, soil degradation becomes economically irreversible (it is not profitable to invest in soil conservation) even though the degradation may be technically reversible. A case study of terracing investments in Peru is used to demonstrate the existence of multiple equilibria under conditions typical of many marginal agricultural areas. These findings help explain why attempts to encourage permanent adoption of soil conservation practices often fail, and how more successful policies could be designed.

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