scholarly journals Black walnut as a valuable stand-forming tree species in Hungary – a growing technology review

2017 ◽  
pp. 129-132
Author(s):  
Károly Rédei ◽  
Borbála Antal
Keyword(s):  
Tree Species ◽  
Black Walnut ◽  
Juglans Nigra ◽  
Furniture Industry ◽  
Exotic Tree ◽  
The Future ◽  
Rotation Age ◽  
Technology Review ◽  
Natural Way

In Hungary black walnut (Juglans nigra L.) is one of the most valuable exotic tree species, mainly because of its excessively liked wood for furniture industry, that has fine tissue and singular colour. Generally it is established by seeding, it can be regenerated by coopice shoot well, but not by seeding in natural way. Black walnut crops regurarly from the age of 25–30 years and its rotation age is 75–85 years. Prosperous decorative shape of stem allows its using in tree plantings out of forests, too. In the future its role can increase mainly on good.

scholarly journals Ecology and Management of Black Walnut (Juglans nigra L.) in Hungary

2019 ◽  
Vol 10 (2) ◽  
pp. 187-191 ◽  
Author(s):  
Károly Rédei ◽  
Marianna Takács ◽  
Tamás Kiss ◽  
Zsolt Keserű
Keyword(s):  
North America ◽  
Tree Species ◽  
Management Practices ◽  
Soil Stabilization ◽  
Stand Structure ◽  
Black Walnut ◽  
Juglans Nigra ◽  
Furniture Industry ◽  
Exotic Tree ◽  
Yield Class

Background and Purpose: Black walnut ( Juglans nigra L.) was one of the first forest tree species introduced and acclimated from North America to Europe in the 17th century. Although native to North America, black walnut is now naturalized and widely planted throughout Europe. In Hungary, this species has played an important role in forest management. Black walnut can grow on various sites, but careful site selection and well-planned management practices are needed to produce successful plantations. Due to the increasing interest in black walnut growing in many countries this study complied with the aim of giving a summary on the base of research and improvement connected with the species over the past decades. Materials and Methods: Black walnut produces a well-closing, favourably differentiated stand structure in consequence of the great genetic diversity of single trees. It utilizes well the leaks of the tending cuttings. In this manner, because of its quick height growth, the systematic, individual selective method can be favourably combined with more frequent stem number reduction. The objective of tending should be to produce a high proportion of good quality saw logs from stands of yield class I, II, III and IV, and some other smaller-dimension industrial wood from stands of yield class V and VI. Conclusions: In Hungary, black walnut is one of the most valuable exotic tree species, mainly because of its wood excessively used in furniture industry. Black walnut is used in furniture industry both as solid wood and veneer. This species is among the most expensive furniture woods in the world due to its appealing surface figure and colour. Its wood is also used for making musical instruments, turned and carved ornaments, statues and marquetry. Black walnut stands are to be important in carbon sequestration, soil stabilization, and water quality protection as well.

scholarly journals Structure of black walnut (Juglans nigra L.) stands on sandy soils in Hungary

2021 ◽  
Vol 67 (No. 6) ◽  
pp. 298-305
Author(s):  
Tamás Ábri ◽  
Zsolt Keserű ◽  
Fruzsina Szabó ◽  
Károly Rédei
Keyword(s):  
Stand Structure ◽  
Sandy Soils ◽  
Black Walnut ◽  
Juglans Nigra ◽  
Structure Factors ◽  
Exotic Tree ◽  
Cultivation Technology ◽  
Rotation Age ◽  
Number Of Stems

Understanding the various processes and relationships that take place in forest ecosystems is generally possible only through long-term observations. This is especially true of the biological production of forests, through the in-depth exploration of their structure. In Hungary the black walnut (Juglans nigra L.) is one of the most valuable exotic tree species, mainly because of its very valuable wood, with fine tissues and unique colour, for furniture industry. Generally, the species is established by manual seeding, and can also be regenerated well by coppice shoots, but not by natural seeding. Black walnut regularly produces seeds from the age of 25–30 years and its rotation age is 70–80 years. It is also used outside forests due to the very decorative stem and crown shapes. In this paper, out of the stand structure factors, the relationships between age and height (r² = 0.7205), age and diameter (r² = 0.7719), age and number of stems per ha (r² = 0.3485) as well as between diameter and number of stems per ha (r² = 0.4595), all considered important for cultivation technology, were examined (based on the data collected in 34 black walnut stands, age of 7 to 67 years). We also analysed the diameter distributions in two black walnut stands with tending operations, reporting them as a case study. Its future role may be increased mainly on sandy soils of better quality, therefore the more accurate exploration of the structure of black walnut stands growing under such conditions can be considered as gap-filling.

Naturalized Exotic Tree Species in Puerto Rico

1991 ◽  
Author(s):  
John K. Francis ◽  
Henri A. Liogier
Keyword(s):  
Puerto Rico ◽  
Tree Species ◽  
Exotic Tree

Naturalized Exotic Tree Species in Puerto Rico

1991 ◽  
Author(s):  
John K. Francis ◽  
Henri A. Liogier
Keyword(s):  
Puerto Rico ◽  
Tree Species ◽  
Exotic Tree

scholarly journals Nitrogen Recovery from Enhanced Efficiency Fertilizers and Urea in Intensively Managed Black Walnut (Juglans nigra) Plantations

Forests ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 352
Author(s):  
Joshua L. Sloan ◽  
Francis K. Salifu ◽  
Douglass F. Jacobs
Keyword(s):  
Black Walnut ◽  
Juglans Nigra ◽  
Water Soluble ◽  
Growth And Yield ◽  
N Recovery ◽  
Competing Vegetation ◽  
Fertilizer N Recovery ◽  
Coated Urea ◽  
Intensively Managed ◽  
Polymer Coated Urea

Intensively managed forest plantations often require fertilization to maintain site fertility and to improve growth and yield over successive rotations. We applied urea-based “enhanced-efficiency fertilizers” (EEF) containing 0.5 atom% 15N at a rate of 224 kg N ha−1 to soils under mid-rotation black walnut (Juglans nigra L.) plantations to track the fate of applied 15N within aboveground ecosystem components during the 12-month period after application. Treatments included Agrotain Ultra (urea coated with a urease inhibitor), Arborite EC (urea coated with water-soluble boron and phosphate), Agrium ESN (polymer-coated urea), uncoated urea, and an unfertilized control. Agrotain Ultra and Arborite EC increased N concentrations of competing vegetation within one month after fertilization, while neither Agrium ESN nor uncoated urea had any effect on competing vegetation N concentrations during the experiment. Agrotain Ultra and Arborite EC increased δ15N values in leaves of crop trees above those of controls at one and two months after fertilization, respectively. By contrast, Agrium ESN and uncoated urea had no effect on δ15N values in leaves of crop trees until three months after fertilization. Fertilizer N recovery (FNR) varied among ecosystem components, with competing vegetation acting as a sink for applied nutrients. There were no significant differences in FNR for all the urea-based EEF products compared to uncoated urea. Agrium ESN was the only EEF that exhibited controlled-release activity in this study, with other fertilizers behaving similarly to uncoated urea.

scholarly journals Identification and quantitative analysis of phenolic compounds naturally occuring in wood of selected European and exotic tree species

2009 ◽  
Vol 70 (1) ◽  
pp. 27-39 ◽  
Author(s):  
Paweł Zarzyński
Keyword(s):  
Quantitative Analysis ◽  
Phenolic Compounds ◽  
Tree Species ◽  
Exotic Tree

Identyfikacja i analiza ilościowa substancji o charakterze fenolowym naturalnie występujących w drewnie wybranych gatunków drzew europejskich i egzotycznych

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