Scarification and Seedfall affects Natural Regeneration of Scots Pine Under Two Shelterwood Densities and a Clear-cut in Southern Sweden

Béland, Martin; Agestam, Eric; Ekö, Per Magnus; Gemmel, Pelle; Nilsson, Urban

doi:10.1080/028275800750015064

Cited by 70 publications

(56 citation statements)

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“…A substantial proportion of the mortality over the 3-year study period occurred during the first winter (between late September/early October and early May the following year), which was also shown for recently germinated Norway spruce seedlings by Granhus et al (2008) and for Scots pine by Béland et al (2000). Although we were not able to identify the actual causes of first winter mortality in the current study, it is likely that several seedlings were lost due to frost heaving (Goulet 1995).…”

Section: Discussioncontrasting

confidence: 44%

“…Important factors that are strongly affected by gap size and the degree of canopy cover include e.g. the occurrence of temperature extremes (Langvall and Löfvenius 2002), establishment and amount of competing vegetation (Nilsson et al 2002), as well as the rate of regrowth in scarified patches (Béland et al 2000;Hanssen et al 2003). …”

Section: Discussionmentioning

confidence: 99%

“…However, when soil scarification is performed shortly after clear-cutting there is a risk of delay until sufficient seed fall is obtained (Sarvas 1957;Drössler et al 2017). Then, competing vegetation will be established in the scarified spots Béland et al 2000), making them less valuable as a germination substrate. Thus, there might be a discrepancy between forestry regulations and planning on one hand and the timing of site preparation with good seed years on the other.…”

Section: Introductionmentioning

confidence: 99%

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Germination and seedling establishment of Norway spruce (Picea abies) after clear-cutting is affected by timing of soil scarification

et al. 2017

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Natural regeneration of Norway spruce (Picea abies (L.) Karst.) is a relatively common practice in Norway on medium to low site indices. However, seedling establishment is often hampered by rapid regrowth of competing vegetation in scarified patches. The aim of our study was to examine the effect of coordinating scarification towards an expected seed-fall, by studying germination and seedling establishment in scarified patches of different age (fresh, one-and two-year-old). The experiment was conducted in two stands in southeast Norway that were clear-cut in 2007. Scarification was applied to subplots in autumn 2008-2010. To simulate seed-fall, seeds were sown in fresh scarification patches in spring 2009-2011, in one-year-old patches in 2010 and 2011, and in twoyear-old patches in 2011. Both germination and seedling survival were negatively affected by the age of the scarified patches. Germination was higher, and mortality lower, at the small fern woodland site, compared with the bilberry woodland site. Sowing in fresh patches also resulted in increased height and root collar diameter of the seedlings compared with sowing in older patches. It is likely that the competing vegetation both on the site and in the scarification patches affected the growth of the seedlings. In conclusion, the age of the scarified patches affected both germination and mortality, as well as early growth of the seedlings.

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Section: Discussioncontrasting

confidence: 44%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Germination and seedling establishment of Norway spruce (Picea abies) after clear-cutting is affected by timing of soil scarification

et al. 2017

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“…The removal of thick litter may eliminate the physical obstacles associated with seed germination and seedling establishment. These measurements have been reported to have a positive effect for natural regeneration in coniferous forests (Béland et al 2000;Narukawa and Yamamoto 2002;Yin et al 2007). …”

Section: Management Implicationsmentioning

confidence: 99%

Germination, osmotic adjustment, and antioxidant enzyme activities of gibberellin-pretreated Picea asperata seeds under water stress

et al. 2009

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Germination of dragon spruce (Picea asperata Mast.) seeds pretreated with gibberellin (GA) in response to water stress and changes in the levels of osmotic adjustments as well as in activities of antioxidant enzymes were investigated. With decreasing water potential caused by increasing concentrations of PEG 6000, germination percentage and germination index decreased gradually; the decrease was especially prominent under the serious water stress from PEG -0.6 MPa. In contrast, osmotic regulation substances (free proline and soluble sugar contents), lipid peroxidation (MDA), and activities of antioxidant enzyme (ascorbate peroxidase, catalase, and peroxidase) increased markedly with decreased water potential. Similarly, the values in all parameters under -0.6 MPa PEG treatment were markedly higher than the control and -0.2 MPa PEG treatment. These results suggested that P. asperata seed germination was insensitive to water stress. In addition, seeds pretreated with GA had increased tolerance to water stress as measured by germination percentage and germination index, osmotic regulation substance, and antioxidant enzyme activities.

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“…The overall natural regeneration was differentiated according to: (i) species composition; (ii) age (oneyear-old and older), due to the high mortality of oneyear-old seedlings (Béland et al 1999;Knott et al 2004). Fig.…”

Section: Resultsmentioning

confidence: 99%

The effects of cutting regimes on natural regeneration in submountain beech forests: species diversity and abundance

Barna¹

2008

J. For. Sci.

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ABstrAct:The paper summarizes the results of 15-year natural regeneration for beech of five plots with different densities situated in the Western Carpathians Mts. Three of the plots were subjected to differently intensive shelterwood cuttings (plots L, M, H), one plot was clear-cut (CC), and one was left without intervention -as a control (C). The number of one-year-old seedlings decreased proportionally with increasing cutting intensity. The ANOVA results document a significant influence of cutting intensity on the abundance of both one-year-old and older seedlings. The abundance of beech seedlings was initially increasing with increasing cutting intensity, and, having reached the peak on plot M (medium intensity), there followed a decrease in the seedling abundance. Lower numbers of beech seedlings on plots subjected to less intensive cutting (C, L) result from less favourable growth conditions in comparison with plot M. On the other hand, cutting of higher intensity (H, CC) resulted in lower numbers of fructifying parent trees. The medium cut intervention having provided the plot M with stocking of 0.5 (50% of the stand) resulted in a lower number of seed resources (limiting factor for natural regeneration). However, for the other factor -seedling establishment (survival and recruitment) this plot (M) represents an ecological optimum in beech regeneration in the given conditions.

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Scarification and Seedfall affects Natural Regeneration of Scots Pine Under Two Shelterwood Densities and a Clear-cut in Southern Sweden

Cited by 70 publications

References 0 publications

Germination and seedling establishment of Norway spruce (Picea abies) after clear-cutting is affected by timing of soil scarification

Germination and seedling establishment of Norway spruce (Picea abies) after clear-cutting is affected by timing of soil scarification

Germination, osmotic adjustment, and antioxidant enzyme activities of gibberellin-pretreated Picea asperata seeds under water stress

The effects of cutting regimes on natural regeneration in submountain beech forests: species diversity and abundance

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