Acorn production of pedunculate oak in northeast of Ukraine

Q4 Agricultural and Biological Sciences
Maksym Rumiantsev, Oleksii Kobets, Natalia Vysotska, Volodymyr Luk’yanets, Iryna Obolonyk, Olha Tupchii, Oleksandr Bondar, Vitalii Nazarenko
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Abstract

Abstract We analysed the quantity and quality of Quercus robur L. acorns after years with a very poor yield under the canopy of natural oak stands of various compositions, ages and stock densities in the northeastern part of Ukraine. We determined the mass of 1,000 healthy and damaged acorns of the current year. The levels of variability were estimated for the number and mass of acorns under the canopy of the studied stands. The dependences of the number of acorns on the age of oak stands and their stock density were studied. The total number of acorns under the canopy of natural oak stands was 9,900–19,000 seeds per hectare with a total mass of 26.8–54.1 kg per hectare in 2020 and 8,600–17,200 seeds per hectare with a total mass of 22.7–48.4 kg per hectare in 2021. The proportion of damaged acorns was about 70% both in 2020 and 2021. The largest number of acorns was concentrated under healthy trees (without signs of decline) that had a well-developed crown and, therefore, received more sunlight and heat. The identified quantitative and qualitative estimates and acorn spreading pattern need to be considered when selecting sites for further natural seed regeneration in old-aged oak stands.
乌克兰东北部有梗橡树的橡实生产
摘要在乌克兰东北部不同组成、不同树龄、不同密度的天然栎树林冠下,分析了产量极低的年份栎树橡子的数量和质量。我们测定了当年1000颗健康和受损橡子的质量。估算了研究林分冠层下橡子数量和质量的变异水平。研究了橡子数与栎树林龄和栎树密度的关系。2020年天然栎树林冠下橡子总数为9900 ~ 19000粒/公顷,总质量为26.8 ~ 54.1 kg /公顷;2021年为8600 ~ 17200粒/公顷,总质量为22.7 ~ 48.4 kg /公顷。2020年和2021年,橡果受损的比例都在70%左右。橡子数量最多的树集中在健康的树下(没有衰退的迹象),这些树的树冠发育良好,因此接受了更多的阳光和热量。在选择高龄栎林种子自然更新的场地时,需要综合考虑已确定的定量和定性估计值以及橡子的扩散模式。
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来源期刊
Forestry Studies
Forestry Studies Agricultural and Biological Sciences-Forestry
CiteScore
0.70
自引率
0.00%
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