scholarly journals Allometric equations, stem density and biomass expansion factors for Cryptomeria japonica in Mount Halla, Jeju Island, Korea

2014 ◽  
Vol 37 (4) ◽  
pp. 177-184
Author(s):  
Sung Cheol Jung ◽  
Roscinto Ian C. Lumbres ◽  
Hyun Kyu Won ◽  
Yeon Ok Seo
Keyword(s):  
Cryptomeria Japonica ◽  
Jeju Island ◽  
Allometric Equations ◽  
Stem Density ◽  
Biomass Expansion Factors ◽  
Density And Biomass

scholarly journals Allometric Equations and Biomass Expansion Factors by Stand Density in Cryptomeria japonica Plantations

2014 ◽  
Vol 103 (2) ◽  
pp. 175-181 ◽  
Author(s):  
Jung-Hwa Gwon ◽  
Huiyeong Seo ◽  
Kwang-Soo Lee ◽  
Byung-Oh You ◽  
Yong-Bae Park ◽  
...  
Keyword(s):  
Cryptomeria Japonica ◽  
Stand Density ◽  
Allometric Equations ◽  
Biomass Expansion Factors

Controlling Purple Jewelweed (Impatiens glandulifera): Assessment of Feasibility and Costs

2017 ◽  
Vol 10 (3) ◽  
pp. 254-261
Author(s):  
Michaël Leblanc ◽  
Claude Lavoie
Keyword(s):  
Riparian Vegetation ◽  
Stem Density ◽  
Impatiens Glandulifera ◽  
Work Time ◽  
Exotic Invasive Species ◽  
Exotic Invasive ◽  
Time Required ◽  
Density And Biomass ◽  
The Relationship ◽  
Control Campaign

We experimentally tested the feasibility of a control campaign of purple jewelweed (Impatiens glandulifera), an exotic invasive species in Europe and North America. We evaluated the amount of time and money required to control the plant along riverbanks, with particular attention paid to the recovery of riparian vegetation following hand pulling and bagging. Work time was directly and significantly related to stem density and fresh biomass of the invader, but the relationship was stronger for density. Density and biomass were strongly reduced by the first hand-pulling operation from a mean of 45 to 2 stems m−2 and from a mean of 0.95 kg m−2 to nearly zero, a good performance but not enough to negate the need for a second hand pulling later in the summer. A single hand pulling significantly reduced the cover of purple jewelweed from to 30% to 7%. Riparian vegetation disturbed by the first hand pulling largely recovered during the following 30 d. Expressed over an area of 1 ha, the total amount of time required to control purple jewelweed is 1,400 work hours over 2 yr, or a minimum investment of Can$21,000 (US$17,000). Although controlling a well-established purple jewelweed population is expensive, to properly evaluate the benefits, we must also consider the costs of soil erosion caused by this species.

scholarly journals Changes in Forest Composition, Stem Density, and Biomass from the Settlement Era (1800s) to Present in the Upper Midwestern United States

2015 ◽  
Author(s):  
Simon Goring ◽  
David J Mladenoff ◽  
Charles V Cogbill ◽  
Sydne Record ◽  
Christopher J Paciorek ◽  
...  
Keyword(s):  
United States ◽  
Land Use ◽  
The United States ◽  
Spatial Distance ◽  
Stand Age ◽  
Stem Density ◽  
Midwestern United States ◽  
South Central ◽  
Density And Biomass ◽  
Spatially Varying

EuroAmerican land use and its legacies have transformed forest structure and composition across the United States (US). More accurate reconstructions of historical states are critical to understanding the processes governing past, current, and future forest dynamics. Gridded (8x8km) estimates of pre-settlement (1800s) forests from the upper Midwestern US (Minnesota, Wisconsin, and most of Michigan) using 19th Century Public Land Survey (PLS) records provide relative composition, biomass, stem density, and basal area for 26 tree genera. This mapping is more robust than past efforts, using spatially varying correction factors to accommodate sampling design, azimuthal censoring, and biases in tree selection. We compare pre-settlement to modern forests using Forest Inventory and Analysis (FIA) data, with respect to structural changes and the prevalence of lost forests, pre-settlement forests with no current analogue, and novel forests, modern forests with no past analogs. Differences between PLSS and FIA forests are spatially structured as a result of differences in the underlying ecology and land use impacts in the Upper Midwestern United States. Modern biomass is higher than pre-settlement biomass in the northwest (Minnesota and north-eastern Wisconsin, including regions that were historically open savanna), and lower in the east (eastern Wisconsin and Michigan), due to shifts in species composition and, presumably, average stand age. Modern forests are more homogeneous, and ecotonal gradients are more diffuse today than in the past. Novel forest assemblages represent 29% of all FIA cells, while 25% of pre-settlement forests no longer exist in a modern context. Lost forests are centered around the forests of the Tension Zone, particularly in hemlock dominated forests of north-central Wisconsin, and in oak-elm-basswood forests along the forest-prairie boundary in south central Minnesota and eastern Wisconsin. Novel FIA forest assemblages are distributed evenly across the region, but novelty shows a strong relationship to spatial distance from remnant forests in the upper Midwest, with novelty predicted at between 20 to 60km from remnants, depending on historical forest type. The spatial relationships between remnant and novel forests, shifts in ecotone structure and the loss of historic forest types point to significant challenges to land managers if landscape restoration is a priority in the region. The spatial signals of novelty and ecological change also point to potential challenges in using modern spatial distributions of species and communities and their relationship to underlying geophysical and climatic attributes in understanding potential responses to changing climate. The signal of human settlement on modern forests is broad, spatially varying and acts to homogenize modern forests relative to their historic counterparts, with significant implications for future management.

scholarly journals Novel and Lost Forests in the Upper Midwestern United States, from New Estimates of Settlement-Era Composition, Stem Density, and Biomass

PLoS ONE ◽  
2016 ◽  
Vol 11 (12) ◽  
pp. e0151935 ◽  
Author(s):  
Simon J. Goring ◽  
David J. Mladenoff ◽  
Charles V. Cogbill ◽  
Sydne Record ◽  
Christopher J. Paciorek ◽  
...  
Keyword(s):  
United States ◽  
Stem Density ◽  
Midwestern United States ◽  
Density And Biomass

Stem volume models for Cryptomeria japonica of Jeju Island, Korea

2019 ◽  
Vol 38 (5) ◽  
pp. 442-456 ◽  
Author(s):  
Nova D. Doyog ◽  
Roscinto Ian C. Lumbres ◽  
Sung Cheol Jung ◽  
Young Jin Lee ◽  
Yeon Ok Seo
Keyword(s):  
Cryptomeria Japonica ◽  
Jeju Island ◽  
Stem Volume ◽  
Volume Models

Comparison of allometric equations and biomass expansion factors for six evergreen broad-leaved trees in subtropical forests in southern Korea

2018 ◽  
Vol 38 (3) ◽  
pp. 199-212 ◽  
Author(s):  
Choonsig Kim ◽  
Gyeongwon Baek ◽  
Byung Oh Yoo ◽  
Su Young Jung ◽  
Kwang Soo Lee ◽  
...  
Keyword(s):  
Allometric Equations ◽  
Subtropical Forests ◽  
Biomass Expansion Factors ◽  
Southern Korea
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