Optimization of maturity age for coppice oak forests within Left-Bank Forest-Steppe in Ukraine

Tkach, V. P.; Buksha, Igor; Slych, Oleksandr; Pasternak, V. P.

doi:10.2478/forj-2020-0026

Cited by 5 publications

(3 citation statements)

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“…Test plots were planted in conditions of moist poor pine site (A2) and relatively poor pine site (B2) in plantations of different ages. The terminology of the typology of forest vegetation sites is given in the publication [18]. Field and laboratory methods.…”

Section: Methodsmentioning

confidence: 99%

Peculiarities of formation of the forest litter of the water protection pine plantations in the Ukrainian interflue of the Dnipro and Desna rivers

Giustino¹,

Yukhnovskyi²,

Urliuk³

et al. 2022

Ukr. j. for. wood sci.

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The effective performance of ameliorative functions by water protection plantations is largely determined by the development of the forest litter, its structure, capacity, quality composition, and degree of mineralization. Therefore, the aim of the study was to identify the features of the formation of the forest litter of pine plantations of the Ukrainian interfluves of the Dnipro and Desna. The study of forest litter was carried out on the accounting sites in all age groups of plantations, in which 22 test plots were laid. Litter samples were taken in between rows and directly in rows of forest plantations. During the analysis of the qualitative composition of the forest litter of young plantations, the dominance of the upper horizon of the inactive fraction, which consisted mainly of needles and branches, was revealed. Here, the share of inactive litter in the conditions of moist poor pine site and moist relatively poor pine site was 8.13 t/ha or 85.1% and 12.54 t/ha or 92.1%, respectively. A large amount of dust, which forms the active fraction, was recorded in the lower horizon. Its stocks were 5.3-5.6 times higher than the reserves of inactive litter. In general, in young pine forests in the conditions of moist poor pine site, the stock of inactive litter is 15.10 t/ha (28.1%), while its presence in of moist poor pine site is 17.91 t/ha, 36.5%. In middle-aged pine forests, the share of the active litter fraction increases, which is a consequence of the active action of its decomposition processes. The share of active litter is 79.3% or 155.29 t/ha in mature stands of the conditions of moist poor pine site. This is evidence of the intensification of the processes of mineralization and activation of the circulation of substances. Three horizons are clearly distinguished in the litter of plantations of older age groups, with a strong connection between them. The lower layer of the forest litter of water conservation plantations is permeated with physiologically active roots, which forms its dense type of structure. Under such conditions, during the separation of the lower layer of litter from the upper one, it does not fall apart and its structure remains dense. The presence of strongly intertwined physiologically active roots in the third horizon of the litter is evidence of the activation of microbiological processes, which are also accelerated by the interception of moisture and the accumulation of humus particles of the soil by the lower layers of the forest litter. To prevent the development of flood processes, the effective performance of water regulation and water purification functions, it is recommended to create water conservation plantations with the formation of the identified type of forest litter

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Section: Methodsmentioning

confidence: 99%

Peculiarities of formation of the forest litter of the water protection pine plantations in the Ukrainian interflue of the Dnipro and Desna rivers

Giustino¹,

Yukhnovskyi²,

Urliuk³

et al. 2022

Ukr. j. for. wood sci.

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“…Additionally, the harvest age of oaks varies considerably from region to region due to differences in species, growing conditions, and commercial purposes, but generally ranges from 70 to 160 years and is concentrated in most regions between 80 and 100 years, as oak growth and timber quality are at a high level during this harvest period [68][69][70][71]. Tkach et al argued that the harvest age of oaks must consider forest senescence beyond 120 years because the health of oak forests with production times of 131-140 years is deteriorating in Ukraine [72]. However, our study showed that in the medium-quality STG2 and STG3, the production time of oaks with 60 cm target diameters is over 200 years, at which time the risk of tip breakage, timber heart rot, and reduced growth will increase significantly, resulting in the reduction in the commercial value of the timber.…”

Section: Harvest Age Of Different Target Diametersmentioning

confidence: 99%

The Minimum Target Diameter and the Harvest Age of Oak Natural Secondary Forests in Different Sites Conditions: Case Study in Hunan Province, China

You,

Zhu

2024

Forests

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Maintaining permanent forest canopy cover and eventually harvesting timber by predetermined target diameter are often considered as a prototype for future management of the oak natural forest. However, target diameters and harvest age based on average forest growth rates from wide geographical areas often hamper improved management of oak forests. In this study, based on the sampling of 129 target trees from 51 oak natural secondary forest plots in Hunan Province, China, an individual-tree DBH (diameter at breast height) growth model of oak target trees was developed, and the site type (41 levels) was related to the model as random effects by a nonlinear mixed-effects approach. Moreover, the 41 site types were clustered into four site type groups (STG1, STG2, STG3, and STG4) by the K-means clustering algorithm to improve the model performance and practicality. With the help of the model, the five target diameters (including 24, 30, 40, 50, and 60 cm) were simulated in each of the four STGs, and the minimum target diameter was determined for each STG based on the theory of quantitative maturity. In the four STGs, the harvest age of the 24 cm diameter target ranged from 30 to 51 years; the harvest age of the 60 cm target diameter ranged from 131 to 220 years, with the oaks failing to reach 60 cm in the lowest-quality STG4; the minimum target diameter ranged from 21 cm to 29 cm. Results showed that lower-quality sites exclude higher target diameters from optimal harvesting strategies, in contrast to the higher target diameter as a more reasonable strategy in higher quality sites, and that the minimum target diameter is significantly influenced by site conditions. Therefore, it is necessary to develop a diverse target-diameter-harvesting strategy adapted for the complex site conditions of oak forests in Hunan Province towards site-specific timber management to improve the sustainability of timber production in oak forests.

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“…For example, the growth and differentiation of the structure and composition of species are dominant processes in the case of former coppices, where variations in biomass distribution, population dynamics, regeneration, intra-and inter-specific selection, and ecological functions lead to significant changes in both abiotic and biotic conditions. [30,[48][49][50][51][52][53][54]. Given the importance of synecological and environmental factors, including climate change and variability, the characterization of the main phenotypes is another important step to achieve an understanding of the processes in place in relation to the characteristics of the site, environmental variability, previous silvicultural management and changes in the trends of climatic variables.…”

Section: The Analytical Planning Schemementioning

confidence: 99%

Adaptive Forest Management under Climate Change: Some Adaption Criteria for Practical Purposes

D'Aprile¹

2022

Preprint

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The compelling effects of climate change on forests may have been underestimated in the past few decades in practical forestry. Although the first attempts to draw attention to this complex problem appeared almost half a century ago, the debate has been conceptual rather than experimental and applicative. At first glance, the con-cerns were mainly related to sustainable forest management (SFM) issues, which obviously needed attention. Over time, the effects of climate change have been mainly considered in the context of the SFM; they started from various and somewhat different scales and goals. Over time, more research and awareness of the im-portance of SFM under the pressure of climate change have led to the development of a clearer field that can be defined as ‘adaptive forest management’ - to climate change. One of the characteristics of this discipline is to be featured by the absence of univocal methods and / or objectives to be pursued but to identify, verify, and adapt methods to the various climatic and forest types and conditions found in the field. Therefore, this work shows some phases of forest planning and management concepts and criteria over time and recalls some innovative and / or adaptive methods related to the approach to forest planning and management under climate change

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Optimization of maturity age for coppice oak forests within Left-Bank Forest-Steppe in Ukraine

Cited by 5 publications

References 5 publications

Peculiarities of formation of the forest litter of the water protection pine plantations in the Ukrainian interflue of the Dnipro and Desna rivers

Peculiarities of formation of the forest litter of the water protection pine plantations in the Ukrainian interflue of the Dnipro and Desna rivers

The Minimum Target Diameter and the Harvest Age of Oak Natural Secondary Forests in Different Sites Conditions: Case Study in Hunan Province, China

Adaptive Forest Management under Climate Change: Some Adaption Criteria for Practical Purposes

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