Changes in the stand structure on permanent Picea abies plots managed with single‐tree selection

1993 ◽  
Vol 8 (1-4) ◽  
pp. 510-517 ◽  
Author(s):  
Lars Lundqvist
Keyword(s):  
Picea Abies ◽  
Stand Structure ◽  
Single Tree ◽  
Single Tree Selection

Effects of Single Tree Selection Harvests on Stand Structure, Species Composition, and Understory Tree Growth in a Sierra Mixed Conifer Forest

1990 ◽  
Vol 5 (2) ◽  
pp. 43-47 ◽  
Author(s):  
R. J. Lilieholm ◽  
L. S. Davis ◽  
R. C. Heald ◽  
S. P. Holmen
Keyword(s):  
Stand Structure ◽  
Diameter Distribution ◽  
Conifer Forest ◽  
Small Tree ◽  
Single Tree ◽  
Mixed Conifer Forest ◽  
Single Tree Selection ◽  
Shade Tolerant Species ◽  
Rates Of Growth ◽  
Understory Tree

Abstract After 20-28 years of single tree selection harvests in initially irregular even-aged stands, stand structure is approaching a target uneven-aged diameter distribution. Seedling stocking in managed stands is nearly three times greater than that of unmanaged stands. Although shade-tolerant species comprise the bulk of most size classes in both managed and unmanaged stands, selection harvests have resulted in adequate quantities of seedlings from all five conifer species, including pines. In managed stands, current small-tree stocking and rates of growth appear adequate to sustain single tree selection harvests over much of a 90-year growth simulation. Simulated peak growth rates of uneven-aged stands compare favorably with actual and anticipated yields from the forest's uneven- and even-aged stands. West. J. Appl. For. 5(2):43-47, April 1990.

scholarly journals Stand Structure and Composition in a Northern Hardwood Forest after 40 Years of Single-Tree Selection

2007 ◽  
Vol 24 (3) ◽  
pp. 197-202 ◽  
Author(s):  
Jonathan K. Neuendorff ◽  
Linda M. Nagel ◽  
Christopher R. Webster ◽  
Maria K. Janowiak
Keyword(s):  
Relative Density ◽  
Sugar Maple ◽  
Stand Structure ◽  
Forest Type ◽  
Diameter Distribution ◽  
Importance Value ◽  
Clear Trend ◽  
Single Tree ◽  
Single Tree Selection ◽  
Over Time

Abstract Uneven-aged northern hardwoods of the Great Lakes region are managed primarily through single-tree selection harvesting. We quantified species composition and stand structure after 40 years of single-tree selection in five stands as compared with three stands that were untreated for 40 years. Relative density and importance value of sugar maple significantly increased under single-tree selection, whereas relative density of yellow birch significantly decreased and eastern hemlock remained unchanged. Contemporary seedling and saplings layers were dominated by sugar maple regardless of treatment, but unmanaged stands contained more species. Diameter distribution varied over time and between unmanaged and managed stands. Increasing-q was the most common distribution shape in 2004, and there was no clear trend toward a negative exponential or rotated sigmoid distribution over time. Our results suggest that long-term single-tree selection may result in regeneration of fewer tree species commonly found in this forest type, with potential implications for future stand structure.

Frost-heaving damage to one-year-old Picea abies seedlings increases with soil horizon depth and canopy gap size

2007 ◽  
Vol 37 (7) ◽  
pp. 1236-1243 ◽  
Author(s):  
Michelle de Chantal ◽  
Kjersti Holt Hanssen ◽  
Aksel Granhus ◽  
Urban Bergsten ◽  
Mikaell Ottosson Löfvenius ◽  
...  
Keyword(s):  
Picea Abies ◽  
Sandy Loam ◽  
Soil Horizon ◽  
Silt Loam ◽  
Frost Heaving ◽  
Single Tree ◽  
Single Tree Selection ◽  
Soil Preparation ◽  
Below Ground ◽  
One Year

We studied first winter frost-heaving damage to one-year-old Picea abies (L.) Karst. seedlings planted in gaps made by group fellings (large circular gaps, ca. 500 m2) and single-tree selection cuttings (small irregularly shaped gaps, ca. 175 m2), as well as in uncut forest. One-month-old seedlings were planted on manually exposed LF, Ae, and B horizons that emulated various intensities and depths of scarification. The three experimental sites were located in multistoried Pinus sylvestris L. or P. abies forests on sandy loam or silt loam in southeastern Norway. Altogether, 5% of seedlings sustained frost heaving damage on the LF horizon, compared with 20% on the Ae horizon and 45% on the B horizon. On average, 31% of the seedlings in large gaps incurred frost-heaving damage compared with 20% in small gaps and 19% in uncut forest. Exposed roots and poorly anchored or uplifted seedlings were recurring classes of damage, especially on the B horizon and in large gaps. The above- versus below-ground biomass ratio of seedlings was higher on the B than on the Ae horizon in uncut forest and large gaps, inferring broken roots. Therefore, to reduce the risk of frost-heaving damage, shallow soil preparation and smaller gap sizes should be used.

scholarly journals Impact of silvicultural system on natural regeneration in Western Himalayan moist temperate forests of Pakistan

2021 ◽  
Vol 67 (No. 3) ◽  
pp. 101-112
Author(s):  
Javed Iqbal
Keyword(s):  
Group Selection ◽  
Stand Structure ◽  
Negative Impact ◽  
Light Exposure ◽  
Selection System ◽  
Single Tree ◽  
Moisture Availability ◽  
Single Tree Selection ◽  
Silvicultural System ◽  
The Impact

Site conditions (topography, aspect, moisture availability, humus thickness, light exposure, and grazing activities) play a vital role in the germination and regeneration process. The research was conducted in the Himalayan moist temperate forest. The research site was divided based on the silvicultural system (group selection system and single-tree selection system) into 148 plots and 150 plots, respectively. The group selection system was examined on the site of 2 ha which was clear-felled under a project in the 1980's. The present study examined the impact of silvicultural systems on regeneration. The frequency table was used, and relative frequency was calculated for the species and silvicultural system, density per m2 was also calculated. Diversity indices were calculated through taxa, dominance, Simpson’s index, Shannon index, evenness, equitability, and fisher alpha. Ten taxa were found in both silvicultural systems, with individual repetition of 17 and 15 taxa, respectively. Group selection is more compact visibly as compared to the single-tree selection system. The single-tree selection system is more diversified in species composition, stand structure, moisture availability, and less humus availability. The study also highlights future predictions for the conservation of these forests, which are highly sensitive and a hotspot for wildlife and climate change phenomena. Silvicultural practices such as silvicultural system, cleaning, weeding, thinning operations are regularly practiced, which can reduce the negative impact on these productive forests.

scholarly journals Preferences for Northern Hardwood Silviculture among Family Forest Owners in Michigan’s Upper Peninsula

2020 ◽  
Author(s):  
Alexander C Helman ◽  
Matthew C Kelly ◽  
Mark D Rouleau ◽  
Yvette L Dickinson
Keyword(s):  
Species Diversity ◽  
Hardwood Forests ◽  
Family Forest Owners ◽  
Forest Owners ◽  
Upper Peninsula ◽  
Northern Hardwood Forests ◽  
Family Forest ◽  
Northern Hardwood ◽  
Single Tree ◽  
Single Tree Selection

Abstract Managing northern hardwood forests using high-frequency, low-intensity regimes, such as single-tree selection, favors shade-tolerant species and can reduce tree species diversity. Management decisions among family forest owners (FFO) can collectively affect species and structural diversity within northern hardwood forests at regional scales. We surveyed FFOs in the Western Upper Peninsula of Michigan to understand likely future use of three silvicultural treatments—single-tree selection, shelterwood, and clearcut. Our results indicate that FFOs were most likely to implement single-tree selection and least likely to implement clearcut within the next 10 years. According to logistic regression, prior use of a treatment and perceived financial benefits significantly increased the odds for likely use for all three treatments. Having received professional forestry assistance increased likely use of single-tree selection but decreased likely use of shelterwood. We discuss these results within the context of species diversity among northern hardwood forests throughout the region.

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