Effects of elevation and postharvest disturbance on the composition of vegetation established after the clear-cut harvest of conifer plantations in southern Shikoku, Japan
Effects of elevation and postharvest disturbance on the composition of vegetation established after the clear-cut harvest of conifer plantations in southern Shikoku, Japan
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海拔和采后干扰对日本四国南部针叶树人工林砍伐后植被组成的影响
DOI：
10.1007/s10310-005-0182-7
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发表时间：
2006
影响因子：
1.5
通讯作者：
Y. Hirata
中科院分区：
文献类型：
--
作者：
A. Sakai;Takahisa Hirayama;S. Oshioka;Y. Hirata
以前砍伐的大片针叶树种植园最近在日本被遗弃。我们调查了砍伐地的植被，并研究了环境因素对植被物种组成的影响。我们设置了32个研究点，每个研究点由几个研究区(5×5米)组成，从220米到1060米不等。海拔和温暖指数(累积热量)是影响物种组成的主要因素，在非度量多维尺度(NMS)排序中，空旷地带的影响较小。双向指示种分析(TWINSPAN)将32个研究地点分为10个植被组，按海拔或收获后干扰(如重新种植或觅食梅花鹿)对地点进行聚类。落叶乔木和灌木在高海拔地区的植被覆盖度较高，而在梅花鹿种群较多的地区则较少。我们还调查了老树物种的丰富性，这些物种预计会在被遗弃的砍伐地点再生。在低海拔地区(600米)，常绿栎树和栎树树苗数量丰富，这表明它们将成功再生。冷杉和罗汉桦的幼树密度明显较大，在砍伐地毗邻天然林的地方，天然林有望成为种子来源。这意味着，如果砍伐地点与种子来源不同，退化的落叶林可以在中海拔和高海拔(>；600米)的砍伐后建立。有人认为，保护天然林对老树物种的再生至关重要。
Large areas of previously clear-cut conifer plantations have been recently abandoned in Japan. We investigated the vegetation in the clear-cut sites and examined the environmental factors affecting species composition of the vegetation. We set up 32 study sites, each composed of several study plots (5 × 5m), ranging from 220m to 1060m a.s.l. Elevation and warmth index (cumulated thermal quantity) were the primary factors affecting the species composition, with clear-cut areas showing a smaller effect in the nonmetric multidimensional scaling (NMS) ordination. Two-way indicator species analysis (TWINSPAN) divided the 32 study sites into ten vegetation groups, clustering the sites by elevation or by postharvest disturbances (i.e., replanting or browsing of Sika deer). Deciduous trees and shrubs were significant in the vegetation cover at higher elevations, while they were less so in areas of high Sika deer populations. We also investigated the abundance of old-growth species, which are expected to regenerate where the clear-cut site is abandoned. EvergreenQuercusandCastanopsissaplings were abundant at low elevations (<600m), suggesting that they will successfully regenerate. The sapling densities ofAbies firmaandBetula grossawere significantly large where a clear-cut site was adjacent to natural forest, which is expected to act as a seed source. This implies that degraded deciduous forests may establish after clear-cutting at intermediate and high elevations (>600m) if the clear-cut site is distinct from seed sources. It is argued that the preservation of natural forests is critical for the regeneration of old-growth species.
日本雪区白神山脉附近不成功的针叶树种植园中树木种群的结构和动态
DOI：
--
发表时间：
2004
期刊：
Forest Ecology and Management 194
影响因子：
--
作者：
Masaki T.;Ohta T.;SugitaH.;Oohara H.;Otani T.;Nagaike T.;Nakamura S.
通讯作者：
Nakamura S.