Felling and skidding damage to residual trees following selection cutting in Caspian forests of Iran

Tavankar, Farzam; Majnounian, Baris; Bonyad, Amir Eslam

doi:10.17221/53/2012-jfs

Cited by 35 publications

(55 citation statements)

References 11 publications

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“…Heavy machinery such as harvesters, forwarders and skidders cannot reach larger trees without cutting or damaging smaller ones along their path . This hypothesis has been confirmed in other selection cuttings where most damaged trees had a dbh smaller than 23 cm (Lamson et al, 1985;Tavankar et al, 2013). These losses seem to be reflected in this increase in the small diameters.…”

Section: Discussionsupporting

confidence: 54%

Using a segmented logistic model to predict trees to be harvested in forest growth forecasts

Fortin¹

2014

For. syst.

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Aim of the study: Predicting future harvested trees is a prerequisite to growth forecasts in managed forest stands. While harvest algorithms have been traditionally used, statistical harvest models could be an interesting alternative approach. The objective of this study was to fit statistical harvest models for different partial cutting treatments.Area of study: The study has been carried out in the province of Quebec, Canada. Material and methods:Data from provincial control survey were used to fit harvest models for three different partial cutting treatments. A two-segment logistic modelling approach was used. The harvest models were designed to be compatible with the ARTEMIS growth simulator, which is currently in use in this province.Main results: The results showed that the probability of being harvested is different across the treatments and primarily depends on tree diameter at breast height and species. In selection cutting treatments in particular, trees close to the merchantable limit (e.g., 23 cm in this study) tended to be less frequently harvested than those with smaller or larger diameters, yielding a sinusoidal pattern that was well captured by the segmented approach.Research highlights: Although the models were of average accuracy as indicated by fit statistics, they made it possible to compare different scenarios in terms of productivity and rotation length when coupled with the ARTEMIS growth simulator. Moreover, compatibility requirements between the simulator and the harvest models appeared to be a major limitation in some cases.

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Section: Discussionsupporting

confidence: 54%

Using a segmented logistic model to predict trees to be harvested in forest growth forecasts

Fortin¹

2014

For. syst.

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“…Intensively managed forest or productive forests are subjected to disturbances caused by logging operations. Damage to residual trees may increase the stand mortality both during the selection cutting operations (Tavankar et al 2011(Tavankar et al , 2013 and during thinning (Picchio et al 2011(Picchio et al , 2012Marchi et al 2014) with a consequent increase of dying or standing dead trees, which take on the confi guration of snags during time.…”

Section: Discussionmentioning

confidence: 99%

Forest management and snag characteristics in Northern Iran lowland forests

Tavankar¹,

Picchio²,

Monaco³

et al. 2014

J. For. Sci.

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Some snag characteristics were studied in three different Hyrcanian lowland forests. The highest snag density (38.4 stem·ha -1 ) was found in fully protected forests, and it was significantly higher than in selectively logged (23.7 stem·ha -1 ) and open access forests (8.8 stem·ha -1 ). The snag volume, diameter and height were also significantly higher in the fully protected forests. The number of snag species was recorded in fully protected (9), selectively logged (5) and open access forests (4). The snags were more evenly distributed among diameter, height and decay classes in the fully protected forest. The larger diameter snags (> 90 cm) and snags higher than 15 m in height were not found in the open access forest. The snags of decay class 5 had a density of 6.8 stem·ha -1 in the fully protected forest, while they had a low density (1.5 stem·ha -1 ) in the selectively logged forest and they were not found in the open access forest. Target values of snags for managed lowland forests in Iran were defined in relation to management influences.

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“…However damage to residual stand and to soil is a natural prospect of selective logging, but the level of damage should be minimized to assure future product quality . Properly planned logging will minimize adverse impacts on the environment of forest (Picchio et al, 2012;Tavankar et al, 2013;Marchi et al, 2014). Rationalization efforts have resulted in an increasing mechanization of timber harvesting systems (Stehman & Davis, 1997;Limbeck-Lilenau, 2003).…”

Section: Introductionmentioning

confidence: 99%

Damages to soil and tree species by cable-skidding in Caspian forests of Iran

et al. 2017

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Aim of study: The main aims of this study were to determine of damage level to residual stand and soil disturbance from mechanized selection logging.Area of study: Mixed beech stands in Caspian forests, northern Iran. Material and methods: Point-transect and systematic plot sampling were used for assessing damages to soil and trees, respectively.Main results: 89% of forest soil area was undisturbed or shallow disturbed, and 5.2% was deep disturbed. Soil bulk density of top 10 cm in the winching corridors, ruts and skid trails were increased 10.7%, 20.6% and 32.1% respectively than controlled area. Frequency of damages to regeneration and trees were 12% and 11.2%. The frequency of damages to regeneration was increased with increasing of their heights, but frequency of damages to trees was decreased with increasing of their diameter. The most type of damages was bole wounds in sizes of 100 to 200 cm 2 within 1 m from the ground level, and deep wounds. The frequency of damages was different in tree species (p = 0.001). The mean size of bole wounds was 174 cm 2 , and the mean height of bole wounds was 70 cm from ground level. The intensity of wounds on trees bole were decreased with increasing of their heights from ground level (p = 0.02), while their sizes were increased (p = 0.001).Research highlights: Winching of logs was the main cause of damages to soil and residual stand. The detailed planning strategy will reduce damage to level which is acceptable and predictable.

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Felling and skidding damage to residual trees following selection cutting in Caspian forests of Iran

Cited by 35 publications

References 11 publications

Using a segmented logistic model to predict trees to be harvested in forest growth forecasts

Using a segmented logistic model to predict trees to be harvested in forest growth forecasts

Forest management and snag characteristics in Northern Iran lowland forests

Damages to soil and tree species by cable-skidding in Caspian forests of Iran

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