伊朗北部Hyrcanian森林中纯林和混合林的树冠间隙特征。

S. Khodaverdi, M. Amiri, D. Kartoolinejad, J. Mohammadi
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引用次数: 1

摘要

树冠间隙在森林生态学中发挥着重要作用,有助于保护生物多样性,影响营养循环,维持复杂的林分结构,也有助于森林的再生。为了调查伊朗海尔卡尼亚森林的林隙特征,对三个主要的老树林和完整林分进行了研究。对于每个冠层间隙,测量了两个参数:长度(L)是间隙内的最长距离,宽度(W)是垂直于长度的最大距离。间隙制造者(DBH≥20cm)被认为是来自上层的树木,其死亡导致树冠开口。在三个老林分中,共研究了89个冠层间隙(角木铁木48个,角木21个,山毛榉19个)。给定的树冠间隙覆盖了5.4%的土地面积,平均每公顷有8个间隙。角木铁木、角木和山毛榉林分的冠层间隙平均大小分别为291、353和565m2。上述三个林分林隙大小的频率分布呈对数正态分布。制造差距的人数从1人到8人不等,中位数为4.5人。在所研究的261个林隙形成者中,61.2%属于角梁铁木林分。此外,在三种森林类型中,有一到四个间隙制造者形成的冠层间隙,而只有在角木林中观察到五个、六个和八个间隙制造器形成的间隙。结果表明,不同森林的林冠间隙在组成、结构复杂、环境特征、间隙制造者的大小、数量和种类等方面具有不同的特征。总的来说,角梁铁木生长在海拔较低的地方,更容易受到风的影响,产生较小的间隙,但更多的间隙制造者。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Canopy gaps characteristics of pure and mixed stands in the Hyrcanian forests of north Iran.
Canopy gaps play an important role in forest ecology helping to preserve biodiversity, influence nutrient cycles, maintain the complex stand structure, and also they substantially contribute to regeneration of forests. To survey the characteristics of canopy gaps in the Hyrcanian forests of Iran, three main old-growth and intact stands were studied. For each canopy gap, two parameters were measured: the length (L) as the longest distance within the gap and the width (W) as the largest distance perpendicular to the length. The gap maker (DBH≥20 cm) was considered to be a tree from the upper tree layer whose death caused an opening in the canopy. A total of 89 canopy gaps were studied in three old-growth stands (48 gaps in hornbeam-ironwood, 21 in hornbeam, and 19 in beech-hornbeam stands). The given canopy gaps cover 5.4% of the land area with an average of eight gaps per hectare. The mean size of the canopy gaps were 291, 353 and 565m 2 for hornbeam-ironwood, hornbeam, and beech-hornbeam stands, respectively. Frequency distribution of the gap sizes the mentioned three forest stands showed a lognormal distribution. The number of gap makers ranged from one to eight with a median of 4.5. Amongst the studied 261 gap makers in all canopy gaps, 61.2% belonged to hornbeam-ironwood stand. Also, there were canopy gaps formed by one to four gap makers within the three forest types, while gaps formed by five, six and eight gap makers were only observed within hornbeam stand. The results showed that the characteristics of the canopy gaps were different in terms of the composition, complexly of structure, environmental characteristics, size, number and species of gap makers in different forests. As a whole, hornbeam-ironwood stands present in lower altitudes, are more susceptible to wind-throw and create smaller gaps but more gap makers.
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来源期刊
Annals of Silvicultural Research
Annals of Silvicultural Research Agricultural and Biological Sciences-Forestry
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2.70
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