Seed Yield and Morphological Variations of Beechnuts in Four European Beech (Fagus sylvatica L.) Populations in Croatia

IF 0.7 Q3 FORESTRY

SEEFOR-South-East European Forestry Pub Date : 2018-06-12 DOI:10.15177/SEEFOR.18-06

Anđelina Gavranović, Cvjetno naselje Hr Jastrebarsko Croatia Seed Husbandry, S. Bogdan, Miran Lanšćak, I. Čehulić, M. Ivanković, Svetošimunska Hr Zagreb Croatia Botany

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引用次数: 9

Abstract

Background and Purpose: Since the last decade, the amount and periodicity of European beech seed crops in Croatia have been disrupted, and thus the regeneration of its forests has become increasingly questionable. The aim of this study was to determine: (1) seed yield variations within and among four European beech populations and its relation with tree crowns projection, (2) variation in seed morphometric traits of the studied populations, and (3) various methods of seed yield estimates. Materials and Methods: Research was carried out in four populations of registered European beech seed stands. Experimental plots 80×60 m in size were established in 2016. Horizontal crown projections were calculated for 25 dominant beech trees at each plot. Seed yield per tree was estimated based on seed traps, and by visual scoring of seeding intensity. On a sample of twenty trees (five trees per population) total seed crops were collected by large nets covering their whole crown projections. Different methods of seed yield estimates were compared. The amount of seed yield per population (number of beechnuts per ha) was estimated as well. The length, width and mass of beechnuts were measured. Data were analysed to establish differences within and between populations. Relationships between seed yield and horizontal crown projection, as well as among seed morphometric traits were analysed. results and Conclusions: The seed trap method overestimated yields when compared with the real yields caught in the large nets. When crown projections were decreased by 25% the seed trap estimation method was improved. A positive correlation between visual scores of seeding intensity and seed yield estimates proved highly unreliable and therefore inaccurate. The results showed high variability of seed yields within and between the populations. The average yields per population varied from 2.4 to 5.9 million seeds·ha−1. A positive and significant correlation between seed yields and crown horizontal projections was shown (R2=0.6285), indicating that stand density is an important factor for seed production. A positive and statistically significant correlation between beechnut mass and width was obtained (R2=0.5875).

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四种欧洲山毛榉(Fagus sylvatica L.)种子产量及形态变异克罗地亚人口

背景和目的:自上一个十年以来，克罗地亚境内欧洲山毛榉种子作物的数量和周期受到破坏，因此其森林的再生越来越成问题。本研究的目的是确定:(1)四个欧洲山毛榉种群内和种群间种子产量的变化及其与树冠投影的关系;(2)所研究种群的种子形态特征的变化;(3)种子产量估算的各种方法。材料与方法:对已登记的欧洲山毛榉种子林的4个种群进行了研究。2016年建立试验田80×60 m。计算每个样地25棵优势山毛榉树的水平树冠投影。每棵树的种子产量是根据种子陷阱和播种强度的目视评分来估计的。在20棵树(每个人口5棵树)的样本上，用覆盖整个树冠投影的大网收集了全部种子作物。比较了不同的种子产量估算方法。每个种群的种子产量(每公顷山毛榉果的数量)也进行了估计。测定了山毛榉的长度、宽度和质量。对数据进行了分析，以确定种群内部和种群之间的差异。分析了种子产量与水平冠突及种子形态计量性状之间的关系。结果与结论:种子诱捕法与大网捕获的实际产量相比高估了产量。当树冠投影减少25%时，对种子陷阱估计方法进行了改进。播种强度和种子产量的目测分数之间的正相关被证明是高度不可靠的，因此是不准确的。结果表明，群体内和群体间的种子产量差异很大。每种群的平均产量在240万~ 590万粒·ha−1之间。种子产量与树冠水平投影呈显著正相关(R2=0.6285)，表明林分密度是影响种子产量的重要因子。山毛榉质量与宽度呈正相关，具有统计学意义(R2=0.5875)。

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来源期刊

SEEFOR-South-East European Forestry FORESTRY-

CiteScore

1.20

自引率

16.70%

发文量

审稿时长

8 weeks

期刊介绍： The primary aim of the SEEFOR journal is to publish original, novel and quality articles and thus contribute to the development of scientific, research, operational and other activities in the field of forestry. Besides scientific, the objectives of the SEEFOR are educational and informative as well. SEEFOR should stimulate intensive professional and academic work, teaching, as well as physical cooperation of institutions and interdisciplinary collaboration, a faster ascendance and affirmation of young scientific personnel. SEEFOR should contribute to the stronger cooperation between the science, practice and society, and to the overall dissemination of the forestry way-of thinking. The scope of the journal’s interests encompasses all ecological, economical, technical, technological, social and other aspects of forestry and wood technology. The journal is open for publishing research from all geographical zones and study locations, whether they are conducted in natural forests, plantations or urban environments, as long as methods used in the research and obtained results are of high interest and importance to South-east European and international forestry.