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首页> 外文期刊>Forest Ecology and Management >Structure of silver fir (Abies alba Mill.) natural regeneration in the 'Jata' reserve in Poland.
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Structure of silver fir (Abies alba Mill.) natural regeneration in the 'Jata' reserve in Poland.

机译：波兰“ Jata”保护区的白枞（Abies alba Mill。）自然再生结构。

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Over the last 20 yr, investigations have been carried out to determine the influence of various ecological factors on silver fir natural regeneration and forest decline in highlands and mountains. However, there has been little research on the structure and development of fir regeneration in lowlands. The results of the study described in this paper indicate that 3 main stand characteristics (site type, percentage of fir and species composition) play a very important part in the structure of fir regeneration lowlands. The quantity, frequency and growth rate of fir regeneration were all affected by site type, with types differentiated by soil water availability and nutrient regime. conditions. One of the most important ecological factors differentiating quantity and quality of fir regeneration was the proportion of fir in a stand. With an increase in the percentage of fir the quantity and the sum of heights and the sum of height increments of fir regeneration tended to increase. The amount and development of fir regeneration were influenced by species composition of a stand, with fir regenerating not only in pure fir stands but also in mixed forests. A positive influence of pine and birch (Betula pendula) canopy on initiation and development of fir regeneration was confirmed. Optimal conditions for the growth and development of fir with respect to species composition were found in mixed fir stands with an admixture of hornbeam (Carpinus betulus). The worst conditions for fir regeneration were found in stands composed of species such as ash (Fraxinus excelsior), alder (Alnus glutinosa), oak (Quercus robur), aspen [Populus], lime (Tilia cordata) and spruce (Picea abies).
机译：在过去的20年中，已经进行了调查以确定各种生态因素对高原和山区银杉自然更新和森林退化的影响。但是，关于低地杉木再生的结构和发育的研究很少。本文描述的研究结果表明，林分再生低地的结构中有3个主要林分特征（林分类型，冷杉百分比和物种组成）起着非常重要的作用。杉木再生的数量，频率和生长速率均受场地类型的影响，其类型因土壤水分有效性和养分状况而异。条件。区分杉木再生量和质量的最重要的生态因素之一是林分中杉木的比例。随着冷杉百分比的增加，冷杉再生的数量和高度总和以及高度增量的总和趋于增加。杉木更新的数量和发展受林分物种组成的影响，冷杉不仅在纯杉木林中而且在混交林中均会再生。确认了松树和桦树冠（Betula pendula）对冷杉再生的开始和发展有积极影响。在混合有角树（Carpinus betulus）的冷杉林中，发现了关于物种组成的冷杉生长和发育的最佳条件。在由灰分（Fraxinus excelsior），al木（Alnus glutinosa），栎木（Quercus robur），白杨[Populus]，石灰（Tilia cordata）和云杉（Picea abies）组成的林分中发现了冷杉再生的最坏条件。

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