A comparison of measurements of the standing crops of biomass and nutrients in a conifer stand in Nova Scotia

Freedman, Bill; Duinker, Peter N.; Morash, R.; Prager, U.

doi:10.1139/x82-078

Cited by 3 publications

(2 citation statements)

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“…In response to these concerns, the Canadian Forest Service initiated the Energy from the Forest program (ENFOR), which included the development of tools to define sustainable levels of organic matter and nutrient removals in biomass. Through ENFOR, allometric equations were defined for the estimation of tree biomass (e.g., revised equations in Ung et al 2008), large amounts of data on nutrient concentrations and contents of different tree components were generated for a variety of species (e.g., Freedman et al 1982), and forest nutrient data were collated (e.g., Kimmins et al 1985) for use in model development (e.g., FORCYTE; Kimmins and Scoullar 1979). This early Canadian work undertaken in the 1970s and 1980s, along with more recent studies by a range of agencies, has been used to estimate carbon and nutrient removal for various combinations of levels of biomass extraction with different stand/site conditions.…”

Section: Assessment Of Impactsmentioning

confidence: 99%

Intensive biomass removals and site productivity in Canada: A review of relevant issues

Thiffault¹,

Paré²,

Brais³

et al. 2010

The Forestry Chronicle

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A renewed interest in the intensive harvesting of forest biomass as a source of bioenergy in North America raises concerns about the impacts that this practice may have on the maintenance of forest soil productivity. In Canada, such concerns were first voiced in the 1970s, and studies were launched to investigate and predict the impact of intensive forest biomass removal on site productivity. Most of these studies focused on static nutrient budgets. In Canada and around the world, more detailed process models were also developed to study carbon, nitrogen and base cation cycles under different forest harvesting intensities. However, the validity of modelling results is still constrained by our lack of knowledge on the capacity of ecosystems to supply nutrients. A few sets of field trials have been established in Canada to gather empirical data on the impact of biomass removal on soil nutrient reserves as well as on tree nutrition and growth. Although still fairly recent, these field trials, along with the older ones established in other countries with similar site conditions and climates, provide opportunities to refine our understanding of the resilience of ecosystem processes and of the impacts of intensive biomass removal on ecosystem functions. Although numerous knowledge gaps and questions remain, some jurisdictions around the world have nevertheless issued policy directives and developed guidelines for biomass harvesting. As described by the concept of adaptive forest management, ecological monitoring of harvesting operations, scientific field testing and modelling can all interact to produce better knowledge that could then help improve policy directives. Key words: bioenergy, biomass, intensive harvesting, environmental sustainability

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Section: Assessment Of Impactsmentioning

confidence: 99%

Intensive biomass removals and site productivity in Canada: A review of relevant issues

Thiffault¹,

Paré²,

Brais³

et al. 2010

The Forestry Chronicle

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“…The above-ground biomass of trees was estimated using published regressions of DBH versus dry weight (Ker 1980;Freedman et al 1982;Freedman 1984). Species-specific equations were used where available, as follows: Abies balsamea, Acer rubrum, A. saccharum, Betula lutea, B. papyrifera, Picea glauca, P. mariana, P. rubens, Populus tremuloides, and P. grandidentata (Freedman et al 1984), and Fagus grandifolia, Larix laricina, Pinus banksiana, P. resinosa, P. strobus, and Tsuga canadensis (Ker 1980).…”

Section: Calculations Of Tree Biomass and Carbon Storagementioning

confidence: 99%

Tree species composition, structure, and carbon storage in stands of urban forest of varying character in Halifax, Nova Scotia

Freedman,

Love,

O'Neil

1996

The Canadian Field-Naturalist

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Characteristics of stands of urban forest in Halifax, Nova Scotia, were analyzed with regards to tree-species composition and carbon sequestration. Older stands in residential and institutional neighbourhoods are dominated by non-native species of trees, thus limiting their usefulness in terms of protection of indigenous biodiversity values. These stands do, however, provide substantial ecosystem service in terms of carbon storage, because they are dominated by relatively large trees with an almost closed canopy (averaging 83% cover), and supporting a relatively large stand biomass (averaging 131 t/ha of above-ground tree biomass). In comparison, younger residential neighbourhoods have larger frequencies of native tree species, reflecting a recent trend to preserving some natural forest as buffer strips between properties. However, the proportion of native species of trees in the younger neighbourhoods is expected to decrease with time, because non-indigenous species are the strongly dominant choice among recent plantings by homeowners. Because of recent disturbance, urban forest in younger neighbourhoods has a relatively small biomass, but this should increase with succession. Natural-forest urban parks have a tree-species composition and stand structure that are similar to that of more remote, natural forests.

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The relationship between the aboveground dry weight and diameter for a wide size range of erect land plants

Freedman¹

1984

Can. J. Bot.

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For 765 stems of plants that spanned eight orders of magnitude of aboveground dry weight (DWT) and three orders of magnitude of stem diameter (DIAM), a plot of log10DWT vs. log10DIAM was highly linear, with an r2 value of 0.997 and a slope of 2.6. The value of this slope may be related to the minimum diameters that are required by upright plants to withstand the horizontal forces of drag that arc exerted at high wind speeds. The multispecies biomass regression gave a similar estimate of the standing crop of a conifer stand to that computed using species- and site-specific tree regressions, indicating the possible general use of such equations in estimating the standing crops of terrestrial ecosystems.

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A comparison of measurements of the standing crops of biomass and nutrients in a conifer stand in Nova Scotia

Cited by 3 publications

References 0 publications

Intensive biomass removals and site productivity in Canada: A review of relevant issues

Intensive biomass removals and site productivity in Canada: A review of relevant issues

Tree species composition, structure, and carbon storage in stands of urban forest of varying character in Halifax, Nova Scotia

The relationship between the aboveground dry weight and diameter for a wide size range of erect land plants

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