Needle mass, fine root and stem wood production in response to silvicultural treatment, tree size and competitive status in radiata pine stands

2003 ◽  
Vol 186 (1-3) ◽  
pp. 287-296 ◽  
Author(s):  
Rolando Rodrı́guez ◽  
Miguel Espinosa ◽  
Glenn Hofmann ◽  
Margarita Marchant
Keyword(s):  
Fine Root ◽  
Radiata Pine ◽  
Tree Size ◽  
Wood Production ◽  
Stem Wood ◽  
Silvicultural Treatment ◽  
Pine Stands ◽  
Needle Mass

Forest Fuels in Unthinned Radiata Pine Stands

1976 ◽  
Vol 39 (4) ◽  
pp. 238-244 ◽  
Author(s):  
D. F. WILLIAMS
Keyword(s):  
Radiata Pine ◽  
Forest Fuels ◽  
Pine Stands

Effect of thinning on production and mortality of fine roots in a Pinusradiata plantation on a fertile site in New Zealand

1987 ◽  
Vol 17 (8) ◽  
pp. 919-928 ◽  
Author(s):  
D. Santantonio ◽  
E. Santantonio
Keyword(s):  
Fine Roots ◽  
Standing Crop ◽  
Fine Root ◽  
General Pattern ◽  
Minor Component ◽  
Root Decomposition ◽  
Root Production ◽  
Soil Core ◽  
Stem Wood ◽  
Small Roots

The effects of heavy thinning (60% reduction in basal area) on fine (< 1 mm diam.) and small roots (1–5 mm diam.) were evaluated during the 2nd year following treatment by periodic soil core sampling in a 12-year-old plantation of Pinusradiata D. Don. Data from these samples enabled us to estimate monthly standing crops of live and dead fine roots and seasonal rates of fine-root decomposition. We used a compartment-flow model to estimate production and mortality of fine roots with monthly resolution from these data. The general pattern of production and mortality was modal and out of phase with soil temperature. On an area basis, thinning reduced the overall standing crop of live fine roots from 1.38 to 0.55 Mg/ha; the standing crop of dead fine roots remained unchanged at 4.37 Mg/ha. The standing crop of live small roots declined from 1.03 to 0.54 Mg/ha. Annual production of fine roots was estimated at 2.2 and 1.9 Mg•ha−1•year−1 in the control and thinned treatment, respectively, and mortality was estimated at 2.1 and 2.0 Mg•ha−1•ear−1 in the control and thinned treatment, respectively. Thinning shortened mean fine-root longevity from 6.2 to 2.5 months. With respect to total dry matter production, fine-root production remained a minor component following a heavy thinning. It accounted for only 4.6 and 6.1% of the stand total in the control and thinned treatments, respectively. These results indicate that on a fertile site with a mild climate the opportunity to shift production from fine roots to another component, such as stem wood, is likely to be small.

scholarly journals Distribution of Fine Roots of Ponderosa Pine and Douglas-Fir in a Central Idaho Forest

2008 ◽  
Vol 23 (4) ◽  
pp. 202-205 ◽  
Author(s):  
Gabriel Dumm ◽  
Lauren Fins ◽  
Russell T. Graham ◽  
Theresa B. Jain
Keyword(s):  
Ponderosa Pine ◽  
Root Distribution ◽  
Fine Roots ◽  
Fine Root ◽  
Douglas Fir ◽  
Tree Size ◽  
Soil Horizon ◽  
Soil Horizons ◽  
Fine Root Distribution ◽  
Root Content

Abstract This study describes soil horizon depth and fine root distribution in cores collected at two distances from the boles of Douglas-fir and ponderosa pine trees at a study site in a central Idaho forest. Concentration and content of fine roots extracted from soil cores were compared among species, soil horizons, tree size, and distance from bole. Approximately 80% of litter and humus samples contained no fine roots. The highest fine root content and concentrations of fine roots occurred in deep mineral soil for both species (1.24 g and 2.82 g/l for Douglas-fir and 0.98g and 2.24 g/l for ponderosa pine, respectively). No statistically significant differences were found in fine root content or concentration between species in any of the four soil horizons. Tree size was not a significant factor in fine root distribution in this study. Significant variables were horizon, distance from bole, and interactions among tree size, location of sample, and soil horizon. This study, which was part of a larger US Forest Service study to develop a predictive model of postfire tree mortality, provides baseline information that may be useful in predicting postfire damage to fine roots.

Fine root growth and mortality in different-aged ponderosa pine stands

2008 ◽  
Vol 38 (7) ◽  
pp. 1797-1806 ◽  
Author(s):  
Chris P. Andersen ◽  
Donald L. Phillips ◽  
Paul T. Rygiewicz ◽  
Marjorie J. Storm
Keyword(s):  
Root Growth ◽  
Pinus Ponderosa ◽  
Ponderosa Pine ◽  
Standing Crop ◽  
Fine Root ◽  
Tree Age ◽  
Root Production ◽  
Age Classes ◽  
Old Growth ◽  
Pine Stands

Root minirhizotron tubes were installed at two sites around three different age classes of ponderosa pine ( Pinus ponderosa Dougl. ex Laws.) to follow patterns of fine root (≤2 mm diameter) dynamics during a 4 year study. Both sites were old-growth forests until 1978, when one site was clear-cut and allowed to regenerate naturally. The other site had both intermediate-aged trees (50–60 years) and old-growth trees (>250 years old). Estimates of fine root standing crop were greatest around young trees and least around intermediate-aged trees. Root production was highly synchronized in all age classes, showing a single peak in late May – early June each year. Root production and mortality were proportional to standing root crop (biomass), suggesting that allocation to new root growth was proportional to root density regardless of tree age. The turnover index (mortality/maximum standing crop) varied from 0.62 to 0.89·year–1, indicating root life spans in excess of 1 year. It appears that young ponderosa pine stands have greater rates of fine root production than older stands but lose more fine roots each year through mortality. The results indicate that soil carbon may accumulate faster in younger than in older stands.

scholarly journals TYPOLOGY, PRODUCTIVITY AND DYNAMICS OF ALEPPO PINE STANDS IN THE OUARSENIS MASSIF (ALGERIA)

AGROFOR ◽  
2020 ◽  
Vol 5 (2) ◽  
Author(s):  
Mohamed SARMOUM ◽  
Rafael NAVARRO-CIRRILLO ◽  
Frederic GUIBAL ◽  
Fatiha ABDOUN
Keyword(s):  
Natural Regeneration ◽  
Basal Area ◽  
Aleppo Pine ◽  
Direct Influence ◽  
Forest Species ◽  
Wood Production ◽  
Silvicultural Management ◽  
Long Time ◽  
Pine Stands ◽  
Semi Arid

Aleppo pine is the most important forest species in Algeria. This species has been used for a long time in reforestation programs, notably the “green dam” planted in the 1970s. Despite this importance, the Aleppo pine continues to undergo all kinds of degradation such as land clearing, illegal cutting and fire. This situation is causing reduction of potential wood production, also jeopardizing the vitality of the stands and their regeneration. This work aims to describe the typology, productivity and dynamics of Aleppo pine stands in the Ouarsenis massif (West of Algeria). 27 plots were installed to describe the stands (composition of forest species, dbh , total height, and basal area). Regeneration was estimated by the rate of juvenile individuals (dbh5cm). The results obtained shows that the Aleppo pine develops different conditions for altitude, climate and type of soil. These conditions have a direct influence on the structure of the Aleppo pine and its productivity. The best populations develop on an average altitude (500 to 1400 m), in subhumid and semi-arid climates, on southern exposures and on limestone soils. The stands are mostly young (age 70 years) with good natural regeneration. These results put focus on the factors of degradation of the Aleppo pine, in particular the recurring fires and the lack of silvicultural management which application can improve the productivity and the vitality of the stands.

Optical, Acoustical, and Fine Root Analyses of Emerald Ash Borer Infested Ash Trees

2019 ◽  
Vol 45 (5) ◽  
Author(s):  
Anand Persad ◽  
Gregory Dahle ◽  
David DeVallance ◽  
Oscar Rocha ◽  
Jason Grabosky
Keyword(s):  
Stress Wave ◽  
Material Properties ◽  
Fine Root ◽  
Emerald Ash Borer ◽  
Agrilus Planipennis ◽  
Image Correlation ◽  
Group Iii ◽  
Stem Wood ◽  
Group I ◽  
Ash Trees

This study on investigating change in the material properties of ash trees after infestation by emerald ash borer (EAB) (Agrilus planipennis) occurred at two locations in northeast Ohio in the summer of 2013. The trees at either site were divided into three groups based on % canopy lost from EAB (group I = 0 to 5%, group II = 6 to 25%, and group III = greater than 40%). A digital image correlation (DIC) system was used to evaluate and compare strain (tissue deformation) on ash branches that were (static) loaded to failure. Stress wave transmission times (Tm) of sound waves through stem wood and fine roots and root balls of the ash trees also were assessed. The DIC evaluations revealed that branches of ash trees that were in groups II and III exhibited significantly lower strain after static loading compared to that observed for trees in group I. Analysis of stress wave Tm revealed that group III trees had significantly higher Tm times compared to the other two groups. Fine root necrosis was significantly higher in group III trees and lowest in group I trees. Extracted root balls from group III trees had significantly higher percentage decay compared to that observed from trees in groups I and II. These data provide fundamental insight into the material properties of ash trees after infestation by EAB and can contribute to arboricultural guidelines for ash tree preservation and help develop safety protocols to address structural loss in trees after EAB infestation.

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

Forests ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 240 ◽  
Author(s):  
Andrzej Węgiel ◽  
Krzysztof Polowy
Keyword(s):  
Carbon Content ◽  
Scots Pine ◽  
Aboveground Biomass ◽  
Stand Density ◽  
Carbon Accumulation ◽  
Continuous Increase ◽  
Stem Wood ◽  
Pine Stands ◽  
And Storage ◽  
Scots Pine Stands

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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