Growth efficiency–survivorship relationship and effects of spacing on relative diameter growth rate of Japanese cedars

Guan, Biing T.; Lin, Shu-Tzong; Lin, Ya-Hui; Wu, Yi-Sui

doi:10.1016/j.foreco.2007.11.028

Cited by 8 publications

(9 citation statements)

References 26 publications

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“…(4), the tendency towards increasing average DBH could be expressed using the estimated parameters, suggesting that it might be possible to estimate the future average DBH growth, using the assumptions mentioned above. Although Guan et al [1] estimated growth model parameters for each permanent plot, the present study estimated the parameters across all the plots. It may therefore be possible to apply these parameters to diameter growth in other unthinned stands, depending on the initial stand condition.…”

Section: Resultsmentioning

confidence: 93%

“…Planning, decision making and the implementation of sound silvicultural practices in forest management require accurate predictions of how stand condition and density are related and likely to change over time [1]. High quality timber production has mainly relied on silvicultural practices in managed stands, such as controlling stand density by thinning.…”

Section: Introductionmentioning

confidence: 99%

“…It is also important to be able to predict growth rates in unthinned stands, and the quantity of dead-wood in them in order to make estimates of carbon stocks. Unthinned stands have long been studied in many parts of the world, including the United States [2], Europe [3,4], and Asia [1,5].…”

Section: Introductionmentioning

confidence: 99%

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Modeling Diameter Growth and Self-Thinning in Planted Sugi (Cryptomeria japonica) Stands

Nakajima¹,

Maeda²,

Shiraishi³

2011

TOFSCIJ

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Abstract:The objectives of this study were to analyze diameter growth in relation to natural thinning in high-density stands in even-aged, pure plantation forests and to develop a growth prediction system based on Japanese permanent plot data. Long-term data recorded in even-aged, pure, unthinned stand plots of Sugi (Cryptomeria japonica) forests were available. Relationships between log-transformed average diameter at breast height (DBH) and stand density were analyzed. In addition, the self-thinning ratio (STR) was analyzed from data gathered from unthinned permanent plots. Relationships between STR and the yield index, Ry (the ratio of actual stand volume to that at full stand density), were also analyzed and modeled. Based on these analyses, the diameter growth rate was formalized as a function of DBH, stand density and stand age, using parameters derived from full density curves. Goodness of fit of predictions of diameter growth in unthinned stands using the estimated parameters were evaluated by comparing predicted stand density and DBH with those observed in the permanent plots. The average error rate, derived by averaging the absolute values of all calculated error rates for the estimated stand density, was 1.8% with a maximum of 6.4%. The average error rate for the DBH was 2.9%, with a maximum of 8.1%. The squared Pearson's correlation coefficients of predicted and observed average DBH were between 0.97 and 1.0.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Modeling Diameter Growth and Self-Thinning in Planted Sugi (Cryptomeria japonica) Stands

Nakajima¹,

Maeda²,

Shiraishi³

2011

TOFSCIJ

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“…In the grazed site, the soil water content did not restrict the growth rate of the seedlings, whereas, weekly irrigation had a differential effect on the RGR of those seedlings that grew in the ungrazed site. The RGR provides a trait directly related to competitive ability, and high competition ability allows environmental restrictions to be overcome (Guan et al 2008). Soil water availability limits the growth of plants and frequently constitutes the main limiting factor in semiarid ecosystems.…”

Section: Discussionmentioning

confidence: 99%

“…The direct or indirect liberation of resources due to overgrazing by livestock positively influences the early growth of P. caldenia seedlings, enhancing the abundance of this species in the rangeland ecosystem (de Villalobos, Peláez, and Elia 2005b). Most studies evaluated the variation in RGR between species by comparing the same species in habitats with different fertility or productivity, or different species from the same habitat (e.g., native species versus exotic species) (James and Drenovsky 2007;Guan et al 2008). Although grass-shrub interactions relating to woody encroachment are well studied (Brown and Archer 1989;Jurena and Archer 2003;Maestre, Bautista, and Cortina 2003;Eldridge et al 2011) there is a gap in the literature relating to the understanding of the functional responses of woody seeding growth and grass competition under livestock grazing.…”

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confidence: 99%

Functional Responses of WoodyProsopis caldeniaSeedlings to Drought and Livestock Grazing in Semiarid Rangelands of Argentina

Villalobos

Peláez

2015

Arid Land Research and Management

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In the semiarid rangelands of Central Argentina overgrazing and drought alter the competitive balance between woody and herbaceous vegetation, favoring an increase in Prosopis caldenia. The objective of this study was to evaluate the effect of competition in perennial grasses and water stress on the relative growth rate (RGR) and related functional attributes of P. caldenia seedlings in sites with different grazing histories: a site exposed to long term (40 or more years) continuous grazing by cattle (grazed experimental site), and a long-term (around 30 years) exclosure (ungrazed experimental site). The total average RGR of the seedlings that grew in the grazed site was significantly higher, whereas the additional water supply favored those seedlings that grew in the ungrazed site. Significant relationships existed between the RGR and all the attributes measured, except in the ungrazed site where only those attributes related to leaf traits were correlated with the RGR. The above-and below-ground biomass of perennial grasses negatively affected the RGR of the P. caldenia seedlings in both experimental sites and soil moisture favored the RGR of the seedlings in the ungrazed site. Our work reveals the ability of seedlings of P. caldenia to take advantage of changes in environmental conditions, such as the release of resources due to overgrazing and to increase its RGR, which ensures its establishment.

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Survival of Cd-exposed Arabidopsis thaliana: Are these plants reproductively challenged?

Keunen

Truyens

Bruckers

et al. 2011

Plant Physiology and Biochemistry

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Growth efficiency–survivorship relationship and effects of spacing on relative diameter growth rate of Japanese cedars

Cited by 8 publications

References 26 publications

Modeling Diameter Growth and Self-Thinning in Planted Sugi (Cryptomeria japonica) Stands

Modeling Diameter Growth and Self-Thinning in Planted Sugi (Cryptomeria japonica) Stands

Functional Responses of WoodyProsopis caldeniaSeedlings to Drought and Livestock Grazing in Semiarid Rangelands of Argentina

Survival of Cd-exposed Arabidopsis thaliana: Are these plants reproductively challenged?

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