Influence of Regeneration Method on the Yield and Stem Quality of Black Locust (Robinia pseudoacacia L.) Stands: a Case Study

Rédei, Károly; Csiha, Imre; Keserű, Zsolt; Gal, J.

doi:10.2478/v10303-012-0008-1

Cited by 17 publications

(25 citation statements)

References 3 publications

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“…In the present study, we observed that seed germination increased with increasing mechanical scarification. This is in line with Vines [22] and Redei et al [23]. Moreover, the seed experiment shows that germination increases when the warm-cold variation is increased.…”

Section: Discussionsupporting

confidence: 91%

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Robinia pseudoacacia L. in Short Rotation Coppice: Seed and Stump Shoot Reproduction as well as UAS-based Spreading Analysis

Carl

Lehmann²,

Landgraf

et al. 2019

Forests

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Varying reproduction strategies are an important trait that tree species need in order both to survive and to spread. Black locust is able to reproduce via seeds, stump shoots, and root suckers. However, little research has been conducted on the reproduction and spreading of black locust in short rotation coppices. This research study focused on seed germination, stump shoot resprout, and spreading by root suckering of black locust in ten short rotation coppices in Germany. Seed experiments and sample plots were analyzed for the study. Spreading was detected and measured with unmanned aerial system (UAS)-based images and classification technology-object-based image analysis (OBIA). Additionally, the classification of single UAS images was tested by applying a convolutional neural network (CNN), a deep learning model. The analyses showed that seed germination increases with increasing warm-cold variety and scarification. Moreover, it was found that the number of shoots per stump decreases as shoot age increases. Furthermore, spreading increases with greater light availability and decreasing tillage. The OBIA and CNN image analysis technologies achieved 97% and 99.5% accuracy for black locust classification in UAS images. All in all, the three reproduction strategies of black locust in short rotation coppices differ with regards to initialization, intensity, and growth performance, but all play a role in the survival and spreading of black locust.Forests 2019, 10, 235 2 of 23 energy policies aimed towards a reduction in the use of fossil fuels and greater utilization of renewable energy since 2004 [7] marked an increase in fast-growing tree production, including black locust in short rotation coppices (harvested every 2-20 years) [8,9]. Nevertheless, some studies have declared black locust to be an invasive non-native tree species in Europe [6,[10][11][12]. However, other studies consider black locust to be an alternative tree species, for example for European ash (Fraxinus excelsior) [13,14], whose high dieback is caused by the fungal pathogen Hymenoscyphus fraxineus [14].Black locust possesses many growth characteristics that makes it ideal for short-rotation biomass production such as: rapid growth, high drought tolerance, and nitrogen-fixation [15,16], as well as the ability to reproduce via stump shoots in response to harvest. Black locust starts flowering at the age of six years [17]. Many insects benefit from this characteristic, including honeybees [18]. Moreover, the production of black locust honey is very common and economically important, especially in Hungary [17]. A maximum of 15,559 flowers per tree were counted in an eight-year-old black locust plantation [18], and 12,000 seeds/m 2 were identified in a monodominant stand [6,19]; black locust thus produces an abundance of seeds. As black locust belongs to the Fabaceae family, the seed coat is hard and impermeable [20,21]. Hence, seeds require scarification for successful germination [21][22][23] and priming of seeds is favorable [21,24,25]. Seeds pre...

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Section: Discussionsupporting

confidence: 91%

“…As black locust belongs to the Fabaceae family, the seed coat is hard and impermeable [20,21]. Hence, seeds require scarification for successful germination [21][22][23] and priming of seeds is favorable [21,24,25]. Seeds prefer mineral-rich sandy and loamy-sandy soil [17,26,27].…”

mentioning

confidence: 99%

Robinia pseudoacacia L. in Short Rotation Coppice: Seed and Stump Shoot Reproduction as well as UAS-based Spreading Analysis

Carl

Lehmann²,

Landgraf

et al. 2019

Forests

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“…Crooks are tolerated in one dimension only, not more than three times the stem diameter (x 2 ); (3) The stem is crooked and leaning. Crooks may reach five times the stem diameter in one dimension and minor crookedness in a second dimension is tolerated (x 3 ); (4) Very crooked in more than one dimension, low branching, forked trees with stem defects, broken crown or stem rot (x 4 ) (Rédei et al 2012). The average stem form value (SFV) was determined on the basis of Eq.…”

Section: Methodsmentioning

confidence: 99%

Selection of promising black locust (Robinia pseudoacacia L.) cultivars in Hungary

Rédei¹,

Csiha²,

Rásó³

et al. 2017

J. For. Sci.

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Rédei K., Csiha I., Rásó J., Keserű Z. (2017): Selection of promising black locust (Robinia pseudoacacia L.) cultivars in Hungary. J. For. Sci., In Hungary the black locust (Robinia pseudoacacia Linnaeus) is one of the most important exotic stand-forming tree species growing mostly under unfavourable ecological conditions. Considering the climate change effects its importance is increasing also in many other countries. As a result of a selection programme several black locust cultivars have been improved for setting up cultivar trials. In the paper four black locust cultivars were evaluated in Central Hungary under arid hydrological and brown forest soil conditions. Significant differences (P < 5%) were found in height, DBH, mean tree volume and average stem form value (SFV).

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“…Black locust cannot be regenerated by seeds in natural way due to its very hard seed coat. On the other hand, the root system is very plastic, its vegetative growth from fragments is intensive and it is hard to uproot [4].…”

Section: Introductionmentioning

confidence: 99%

Plantation Silviculture of Black Locust (Robinia pseudoacacia L.) Cultivars in Hungary – A Review

Rédei¹,

Keserű

Csiha

et al. 2017

SEEFOR

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Influence of Regeneration Method on the Yield and Stem Quality of Black Locust (Robinia pseudoacacia L.) Stands: a Case Study

Cited by 17 publications

References 3 publications

Robinia pseudoacacia L. in Short Rotation Coppice: Seed and Stump Shoot Reproduction as well as UAS-based Spreading Analysis

Robinia pseudoacacia L. in Short Rotation Coppice: Seed and Stump Shoot Reproduction as well as UAS-based Spreading Analysis

Selection of promising black locust (Robinia pseudoacacia L.) cultivars in Hungary

Plantation Silviculture of Black Locust (Robinia pseudoacacia L.) Cultivars in Hungary – A Review

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