+ Most Popular
Cunninghamia lanceolata plantations in China
Mammalian lairs in paleo ecological studies and palynology
Studies on technological possibilities in utilization of anhydrous milk fat for production of recombined butter-like products
Should right-sided fibroelastomas be operated upon?
Large esophageal lipoma
Apoptosis in the mammalian thymus during normal histogenesis and under various in vitro and in vivo experimental conditions
Poissons characoides nouveaux ou non signales de l'Ilha do Bananal, Bresil
Desensitizing efficacy of Colgate Sensitive Maximum Strength and Fresh Mint Sensodyne dentifrices
Administration of fluid by subcutaneous infusion: revival of a forgotten method
Tundra mosquito control - an impossible dream?
Schizophrenia for primary care providers: how to contribute to the care of a vulnerable patient population
Geochemical pattern analysis; method of describing the Southeastern limestone regional aquifer system
Incidence of low birth weights in a hospital of Mexico City
Graded management intensity of grassland systems for enhancing floristic diversity
Microbiology and biochemistry of cheese and fermented milk
The ember tetra: a new pygmy characid tetra from the Rio das Mortes, Brazil, Hyphessobrycon amandae sp. n. (Pisces, Characoidei)
Risk factors of contrast-induced nephropathy in patients after coronary artery intervention
Renovation of onsite domestic wastewater in a poorly drained soil
Observations of the propagation velocity and formation mechanism of burst fractures caused by gunshot
Systolic blood pressure in a population of infants in the first year of life: the Brompton study
Haematological studies in rats fed with metanil yellow
Studies on pasteurellosis. I. A new species of Pasteurella encountered in chronic fowl cholera
Dormancy breaking and germination of Acacia salicina Lindl. seeds
therapy of lupus nephritis. a two-year prospective study

Dynamics of Acorn Production and Quality of English Oak Acorn (Quercus Robur L.) in Disrupted Ecological Conditions

Dynamics of Acorn Production and Quality of English Oak Acorn (Quercus Robur L.) in Disrupted Ecological Conditions

Sumarski List 135: 169-181

ISSN/ISBN: 0373-1332

Pedunculate oak is a climatogenic species and it constitutes principal forest communities. If some ecological factor in its habitat is altered, due to unfavorable biotic and abiotic factors, common oak cannot adjust fast and it suffer substantial damage over the years. Current ecological imbalance can be recognized as main reason in oak dieback. Deterioration sings become visible and they are reflected in decline of tree vitality, unsettled and low yield and also remote natural forest regeneration. Variability in acorn production is the result of sin ecological and genetic factors. Acorn yield is the most influenced by maternal trees. Pedunculate oak belongs to subgenus Lepidobalanus and has tendency of periodical yield, with return of every 4 years (abundant), and every 2 years (normal). Research on acorn production have been carried out in "Spacvanski bazen" area in period from 2006 to 2010. Main research goal was to monitor acorn crop according to quality and quantity, in stands of different age - middle aged, older and old forests, so production potential could be identified. Experimental plots were established in 2006. (Tables 1 and 2). Acorn production assessment- acorn growth and development, was monitored by cone-shaped acorn-collecting traps method. Acorn-collecting traps were placed beneath the canopy of selected trees of different crown damage classes. In the crop years acorns were collected, and in the spring next year seedlings were counted. Collected materials were analyzed in the Laboratory for testing seed quality. Seed quality was tested accordingly to ISTA methodology. Monitoring of growth and development of acorns by acorn-collecting traps method (Table 3) proved the fact that most matured and normally developed acorns came from older stands, and the least in old stands. Regarding crown damage degrees the most matured acorns came from crown damage class 2A, and least from class 2B and 3. First acorn crop was in 2006 and second in 2010. (Tables 4 and 5). In year 2006 acorn crops was more abundant than in 2010. The best acorn crop was in old stands (on average 269 kg/ha), the worst was in middle aged forests (41 kg/ha). With reduction of tree age came reduction in acorn crop. Yield in 2010 was the best in older forests (90 kg/ha) and the worst in middle aged forests (30 kg/ha). Average number of seedlings was at its peak in old forests (40000 pts/ha), the worst in older forests (16167 pts/ha). Periodicity in acorn production during the period of 1 1 years in the management unit Slavir and on the area of Forest Administration Office Vinkovci followed same trend in 11 years time (Figure 1 and 2). Annual acorn production was monitored for 11 years and crop years were: 2000, 2002, 2003, 2006 and 2010. Average quality values for acorns harvested on experimental plots were: 2006. (Figure 3)- viability 83%, insects presence 12% 1000 seed weight 5384 g, number of acorn/kg 185 pts/kg; yield 2010. (Figure 4): germination capacity 71%, rotten and decayed seed 29%, 1000 seed weight 4933 g, number of acorn/kg 203 pts/kg. Based on study of acorn periodicity yielding and quality crops conclusions can be made: degree of crown defoliation significantly influences quantity of produced acorns, old forests produced the most acorns, seed production decreased with age. Number of seedlings shows us that the most quality acorns remains in crowns and its fells after commercial seed collecting are completed. In middle aged forest number of seedlings in double the quantity than other investigated stands, acorn maturation is longest, and acorn fells on ground later Monitoring of dynamics and seed production quantity during II years, crop years occurs significantly every 2 to 3 years and they differ in quantity. During that period were 5 mast years. Abundance of yield represents productional potential of stands. In old stand abundant acorn crops is identified with average yield of 269 kg/ha or 114748 pts of acorn/ha. Seed production abundancy is far below what is considered as abundant, therefore significant effort is required for preserving acorns in crowns after maturing and felling on the ground.

Please choose payment method:

(PDF emailed within 1 workday: $29.90)

Accession: 070669359

Download citation: RISBibTeXText

Related references

Flowering biology of Quercus petraea (Matt.) Liebl. and Quercus robur L. and stimulation of acorn production. Revista padurilor industria lemnului celuloza si hirtie: silvicultura si exploatarea padurilor 97(3): 138-145, 1982

Results of an investigation of the quality of acorn of peduncled oak (Quercus robur L.) and sessile-flowered oak (Quercus petraea Liebl.) damaged by insects and fungi. Radovi Sumarski Institut Jastrebarsko 39(1): 5-18, 2004

Flower abundance, premature acorn abscission, and acorn production in Quercus alba L. Botanical Gazette 143(2): 216-218, 1982

Study of the acorn of the oak d quercus ilex d part 5 industrial production of acorn meal and extraction of its oil. Grasas y Aceites 20(5): 227-230, 1969

Process of acorn production and acorn crop variation in mizunara (Quercus mongolica var. grosseserrata) in a crossing garden. Journal of the Japanese Forestry Society 82(1): 44-49, 2000

Formation peculiarities of Quercus robur L. acorn mycobiota under conditions of Kyiv Polissya. Mikrobiolohichnyi Zhurnal 75(4): 69-73, 2013

Contribution to the investigation of the chemical composition of the acorn of various quercus spp in algeria investigating the acorn of quercus ilex. Dokladi na B"lgarskata Akademiya na Naukite 43(7): 83-86, 1990

Estimation of leaf nitrogen concentrations in Quercus robur L. using the CCM-200 portable chlorophyll meter for different patterns of vegetative growth and acorn production. New Forests 47(4): 513-527, 2016

Variability of Quercus robur L. and Quercus petraea (Matt.) Liebl. acorn size in the region of the Pomeranian plains. Dendrobiology 47(Suppl): 25-31, 2002

Antimicrobial Activity of Quercus Robur L. (Acorn). Fresenius Environmental Bulletin 26(12): 6992-6995, 2017

Acorn size as an indicator of individual variability of Quercus robur. Glasnik za Sumske Pokuse, Posebno Izdanje 4: 195-205, 1993

Frost resistance of pedunculate oak (Quercus robur L.) acorn with 42% humidity. Sylwan 140(8): 33-41, 1996

Variation in acorn characteristics in three provenances of Quercus aucheri Jaub. et Spach and provenance, temperature and storage effects on acorn germination. Seed Science and Technology 33(2): 441-447, 2005

Variability of acorn nutrient concentrations in pedunculate oak (Quercus robur L.) genotypes. Journal of Forest Science 52(2): 51-60, 2006

Drying of the aqueous extract of acorn Quercus robur in a spout-fluid bed. Journal of Agricultural Sciences, Belgrade 50(2): 173-182, 2005