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首页> 外文期刊>South-East European Forestry >Site Index and Volume Growth Percentage Determination for Privately Owned Uneven-aged Stands of Quercus pubescens and Quercus ilex along the Croatian Adriatic Coast
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Site Index and Volume Growth Percentage Determination for Privately Owned Uneven-aged Stands of Quercus pubescens and Quercus ilex along the Croatian Adriatic Coast

机译：克罗地亚亚得里亚海沿岸的毛白栎和白栎私有不平均林分的立地指数和体积增长百分比确定

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Background and Purpose: Although organized forestry has existed in Croatia for more than 250 years, this mostly entailed state forests. During the last decade, Extension Services have started to support the development of forest management plans for privately owned forests. Lately, FMPs have been developed for nearly 3/4 of privately owned forests in Croatia. During the creation of those plans, yield tables and normal models for state-owned forests, primarily even-aged stands with long-time management, were used because similar data was not developed for uneven-aged and poorly managed forests. This research encompasses privately owned forests in the Croatian Mediterranean and sub-Mediterranean regions where holm oak (Quercus ilex L.) and downy oak (Quercus pubescens Willd.) are the prevailing species in forest stands. The main goal was to determine site indices revealed in the analysis of yearly radial increments and to create relevant yield tables. Materials and Methods: In this study, 1286 oak trees were cored to the centre on 377 locations spread in privately owned forests in Croatian Mediterranean and sub-Mediterranean regions. The ratio of trees and locations was approximately 3:1 for Q. pubescens. Some cored trees were more than two centuries old. After the standard sample preparation for dendrochronological analysis, cores were scanned, and tree-ring widths were determined. In total, ring width for over 67,000 rings was determined and measured. Results: Based on the data dispersion of cumulative tree increments at 40 years of age, 2 site index classes for Q. ilex and 3 for Q. pubescens were created based on k-means clustering. Prodan’s growth function was fitted to the created clusters to determine the site’s “model” tree. For the model trees, the percentage of volume growth was calculated. For easier field site index determination, height curves based on field data for each site index were calculated. Conclusions: For the first time in Croatia, systematic and controlled data on the growth (and age) of uneven-aged privately owned forests in the Croatian Mediterranean and sub-Mediterranean area were collected. Based on the data collected in the field, three different site indices for downy oak and two site indices for holm oak were determined. These results could find their application during operational forest management and forest exploitation because they allow for more accurate determination of the site production strength in the explored stands.
机译：背景和目的：尽管克罗地亚有组织的林业已有250多年的历史，但这主要是国有森林。在过去的十年中，推广服务已开始支持为私有林制定森林管理计划。最近，在克罗地亚为近3/4的私有森林开发了FMP。在创建这些计划时，使用了国有林的产量表和正常模型，主要是具有长期管理的平均年龄的林分，因为没有为年龄不均和管理不善的森林开发类似的数据。这项研究涵盖了克罗地亚地中海和地中海南部地区的私有森林，其中圣栎（Quercus ilex L.）和绒毛栎（Quercus pubescens Willd。）是林分中的主要树种。主要目标是确定在分析年度径向增量时揭示的场地指数，并创建相关的产量表。资料和方法：在这项研究中，以1286棵橡树为中心，分布在克罗地亚地中海和地中海南部地区私有森林中的377个位置。毛竹Q.的树木和位置的比例约为3：1。一些有芯树木已经有两个多世纪的历史了。在进行用于树木年代学分析的标准样品制备后，对岩心进行了扫描，并确定了年轮宽度。总共确定并测量了超过67,000个环的环宽度。结果：基于40岁时累积树增量的数据分散，基于k均值聚类创建了Q. ilex的2个站点索引类和pubescens的3个站点索引类。将Prodan的增长功能应用于已创建的集群，以确定站点的“模型”树。对于模型树，计算了体积增长的百分比。为了更容易确定现场站点索引，计算了基于现场数据的每个站点索引的高度曲线。结论：在克罗地亚，地中海和地中海下地区首次收集了关于年龄不均的私有林的生长（和年龄）的系统和受控数据。根据现场收集的数据，确定了毛绒橡树的三个不同站点指数和圣栎的两个站点指数。这些结果可以在操作性森林管理和森林开发中找到应用，因​​为它们可以更准确地确定所探查林分的现场生产强度。

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