Effect of stand densities on stand dynamics in white fir (Abies concolor) forests in northeast California, USA

Zhang, Jianwei; Oliver, William W.; Ritchie, Martin W.

doi:10.1016/j.foreco.2007.03.036

Cited by 20 publications

(12 citation statements)

References 8 publications

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“…More intense growth was noted in non-thinned control stands [43][44][45]. Due to intensive thinning, the stand volume increment was smaller than in control stands [19,20,46], whereas due to low intensity management, the influence of thinning was weak or none [46,47]. Some studies show a complete lack of influence of thinning on either stand growth [21,48] or biomass production [49].…”

Section: Discussionmentioning

confidence: 99%

Aboveground Carbon Content and Storage in Mature Scots Pine Stands of Different Densities

Wegieł¹,

Polowy²

2020

Forests

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Background and Objectives: The continuous increase in the amount of atmospheric CO2 is a factor that significantly contributes to global warming. Forests can be used to mitigate climate change by absorbing carbon and storing it. Scots pine (Pinus sylvestris L.) is the most abundant tree species in Polish forests and can substantially aid carbon accumulation. The aim of the study was to determine the carbon content in the dry mass of various parts of Scots pine trees and to evaluate the relationship between the accumulation of carbon in aboveground tree biomass and some stand parameters. Materials and Methods: The research was carried out in 20 even-aged (81–90 years old) Scots pine stands in northwestern Poland (Drawno Forest District). The densities of these stands ranged from 476 to 836 trees per hectare. The aboveground biomass was calculated as the sum of the following tree compartments: stem (wood and bark), dead branches, thick branches, thin branches and needles. The carbon content and storage in these compartments was determined. Results: The mean carbon content was lowest in stem wood (47.0%) and highest in needles (50.3%). No correlation between the stand density and the level of carbon stored in the aboveground biomass of Scots pines was found.

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Section: Discussionmentioning

confidence: 99%

Aboveground Carbon Content and Storage in Mature Scots Pine Stands of Different Densities

Wegieł¹,

Polowy²

2020

Forests

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“…Fire acts as a bottleneck for tree establishment (Higgins et al, 2000) but individual trees that successfully escape the fire trap might benefit from fire because fire reduces the size of their competitors and thereby the asymmetry in competitive interactions. Although density-dependent self-thinning effects have been observed in forest systems (Niklas et al, 2003;Bagchi, 2007;McCarthy & Weetman, 2007;Zhang et al, 2007), they have only rarely been investigated in savannas (MacGregor & O'Connor, 2002) and seldom in the context of fire. Hély et al (2006) and Hickler et al (2006) report that the fire submodels of DGVMs (Thonicke et al, 2001;Sitch et al, 2003) are major sources of uncertainty.…”

Section: Discussionmentioning

confidence: 99%

Impacts of climate change on the vegetation of Africa: an adaptive dynamic vegetation modelling approach

Scheiter

Higgins

2009

Global Change Biology

356

432

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Recent IPCC projections suggest that Africa will be subject to particularly severe changes in atmospheric conditions. How the vegetation of Africa and particularly the grasslandsavanna-forest complex will respond to these changes has rarely been investigated. Most studies on global carbon cycles use vegetation models that do not adequately account for the complexity of the interactions that shape the distribution of tropical grasslands, savannas and forests. This casts doubt on their ability to reliably simulate the future vegetation of Africa. We present a new vegetation model, the adaptive dynamic global vegetation model (aDGVM) that was specifically developed for tropical vegetation. The aDGVM combines established components from existing DGVMs with novel processbased and adaptive modules for phenology, carbon allocation and fire within an individual-based framework. Thus, the model allows vegetation to adapt phenology, allocation and physiology to changing environmental conditions and disturbances in a way not possible in models based on fixed functional types. We used the model to simulate the current vegetation patterns of Africa and found good agreement between model projections and vegetation maps. We simulated vegetation in absence of fire and found that fire suppression strongly influences tree dominance at the regional scale while at a continental scale fire suppression increases biomass in vegetation by a more modest 13%. Simulations under elevated temperature and atmospheric CO 2 concentrations predicted longer growing periods, higher allocation to roots, higher fecundity, more biomass and a dramatic shift toward tree dominated biomes. Our analyses suggest that the CO 2 fertilization effect is not saturated at ambient CO 2 levels and will strongly increase in response to further increases in CO 2 levels. The model provides a general and flexible framework for describing vegetation response to the interactive effects of climate and disturbances.

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“…Heavy thinning was usually associated with a lower stand volume increment than that found on unthinned control plots (del Río et al 2008;Mäkinen and Isomäki 2004a;Valinger et al 2000). For light thinning, weak or no correlations were found (del Río et al 2008;Zhang et al 2007). Other studies found that, immediately after thinning, there was a decrease in stand volume growth, typically lasting approximately 10 years, levelling off after this period (Egnell and Ulvcrona 2015).…”

Section: Introductionmentioning

confidence: 96%

Relationship between stand density and value of timber assortments: a case study for Scots pine stands in north-western Poland

Wegieł

Bembenek

Łącka

et al. 2018

N.Z. j. of For. Sci.

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Background: Stand density changes during forest growth. Various types and intensities of thinning operations can be applied in order to improve the volume of the remaining trees. It is not clear whether or not thinning results in better total volume increment although timber value is usually higher when thicker logs are obtained from trees. The objective of this study was to determine if Scots pine (Pinus sylvestris L.) stands of lower density would produce timber of a higher value than stands with a higher density and thinner trees. Methods: The research was carried out on 20 experimental plots in 81-90-year-old Scots pine stands, located in northwestern Poland. The data obtained were used to simulate the logging of the trees into either 2.5-m logs or tree tops, which were classified into five quality classes of timber. The volume of each assortment was calculated, based on its dimensions, and the value in EUR was calculated. Results: It was found that the correlation between stand density and the total value of the wood was very weak and not statistically significant. However, taking each assortment separately, the values of sawmill wood, pulpwood and energy wood were significantly correlated with stand density. Conclusions: It was concluded that lower densities were more profitable for sawmill wood production, while higher densities might be more beneficial in biomass production.

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Effect of stand densities on stand dynamics in white fir (Abies concolor) forests in northeast California, USA

Cited by 20 publications

References 8 publications

Aboveground Carbon Content and Storage in Mature Scots Pine Stands of Different Densities

Aboveground Carbon Content and Storage in Mature Scots Pine Stands of Different Densities

Impacts of climate change on the vegetation of Africa: an adaptive dynamic vegetation modelling approach

Relationship between stand density and value of timber assortments: a case study for Scots pine stands in north-western Poland

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