Coexistence of three canopy tree species in a riparian forest in the Chichibu Mountains, central Japan

Sakio, Hitoshi; Kubo, Masako; Shimano, Koji; Ohno, Keiichi

doi:10.1007/bf02803190

Cited by 46 publications

(37 citation statements)

References 20 publications

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“…P. rhoifolia grew in patches of even-aged trees (ca. 90 years old) based on measurements of core samples (Sakio et al, 2002). On the other hand, C. japonicum was the third most dominant species and grew up to 40 m tall and 150 cm in DBH, and almost all individuals of this species produced numerous sprouts.…”

Section: Study Site and Methodsmentioning

confidence: 99%

“…Consequently, C. japonicum can create colonies by producing sprouts of various ages, which changes the age make-up of a stand. C. japonicum juveniles are more rare than those of coexisting tree species in riparian forests (Sakio et al, 2002), because most seedlings die in the current year as a result of desiccation or washing away despite their shade-tolerance (Kubo et al, 2000;Kubo et al, 2004). However, C. japonicum can maintain its populations by sprouting over long periods, thereby compensating for sparse seedling regeneration.…”

Section: Traits Of C Japonicum Sproutsmentioning

confidence: 99%

“…et Zucc. is a common tree species in riparian forests of Japan, and it maintains its populations over long periods of time by sprouting (Kubo et al, 2001a;Sakio et al, 2002). Since the sprouts of this species are often found in unstable areas, e.g., on steep slopes, small disturbances such as soil erosion probably provide a stimulus for sprouting (Kubo et al, 2001a).…”

Section: Introductionmentioning

confidence: 99%

“…However, few studies have investigated sprouting by C. japonicum (Kubo et al, 2001a;Sakio et al, 2002), and little is known about the age structure and dynamics of sprouts or about the ability of this species to sprout after experiencing physical damage. Extended longevity by sprouting is essential to the species composition of a particular area (Malanson and Westman, 1985); therefore, it is important for conservation and/or management of riparian forests to understand the sprouting capability of C. japonicum.…”

Section: Introductionmentioning

confidence: 99%

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Age structure and dynamics of Cercidiphyllum japonicum sprouts based on growth ring analysis

Kubo¹,

Sakio²,

Shimano³

et al. 2005

Forest Ecology and Management

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We investigated the factors that encourage sprouting by Cercidiphyllum japonicum, as well as its ability to sprout after cutting, by analyzing the age structure, distribution, and growth of sprouts in one stool of this species. C. japonicum produced numerous sprouts in various age classes, ranging from 7-92 years old; the main stem was 226 years old.Sprouts that were relatively close in age (e.g., 30 or 80 years old) tended to form clusters.Based on an increase in the width of annual growth rings, we estimated that gap formation occurred about 30 years ago. This encouraged existing sprouts to grow more, and many sprouts were produced on the periphery of the stand to take advantage of the improved light conditions. After cutting, larger stems produced more simultaneous sprouts; therefore, sprout occurrence probably depends on the biomass of parent stems, although smaller stems were also able to produce some simultaneous sprouts. In the absence of physical damage, C. japonicum produced more sprouts as a function of increased age as a means of self-maintenance. C. japonicum sprouted simultaneously in response to external disturbances, such as gap formation and cutting, and it sprouted sequentially with increasing age. Therefore, although C. japonicum seedlings are rarely found in forests, C. japonicum can maintain its populations over long periods by sprouting, which compensates for sparse seedling regeneration.

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Section: Study Site and Methodsmentioning

confidence: 99%

Section: Traits Of C Japonicum Sproutsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Age structure and dynamics of Cercidiphyllum japonicum sprouts based on growth ring analysis

Kubo¹,

Sakio²,

Shimano³

et al. 2005

Forest Ecology and Management

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“…In the forests of northern Oman, for example, FISHER and GRANDER (1995) have identified variations in the population size and regeneration of juniper woodlands as being affected by the microclimate, topography and hydrology of the area. In addition to these environmental and climatological factors, however, human activities (primarily over-grazing by livestock and related disturbances) are one of the principal influences on woodland species (OLIVER 1980, AGREN and ZACH-RISSON 1990, SKARPE 1990, STEWART and ROSE 1990, WELDEN et al 1991, VEBLEN 1992, SAKIO 1997, LYKKE 1998, SAKIO et al 2002, TANAKA et al 2008.…”

Section: Introductionmentioning

confidence: 99%

Population structure of woody plants in the arid cloud forests of Dhofar, southern Oman

El-Sheikh¹

2013

Acta Botanica Croatica

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-This study evaluates the size frequency distribution of 11 trees and shrubs in the cloud forest in Wadi Garziz, southern Oman, in order to assess their current situation, which is affected by cutting, overgrazing and other constraints. A size class distribution and a vegetation structure analysis were applied in order to analyze the dynamics of this forest using census data from 51 plots selected across 5 transects covering the hill-slope and wadi-bed habitats. Some of the trees inhabiting the hill-slopes (e.g. Acacia senegal and Commiphora spp.) were found to exhibit an inverse J-shaped distribution with constant regeneration, whilst in the wadi bed these same trees exhibited a J-shaped distribution (i.e. of declining populations). On the other hand, Acacia etbaica inhabiting the hill-slopes exhibited a tendency towards a J-shaped distribution and an inverse J-shaped distribution in the wadi-bed. All the populations (i.e. inhabiting the hill-slopes and the beds) of Anogeissus dhofarica had a J-shaped distribution whereas all the populations of Blepharispermum hirtum had a more or less inverse J-shaped distribution. The Ziziphus spina--christi and Acacia tortilis populations, meanwhile, exhibited the bi-modal shape of size distribution. The shrubs inhabiting the hill-slopes (e.g. Coroton confertus and Ormocarpum dhofarense) exhibited a tendency towards a J-shaped distribution; such distribution characterizes a declining population with a limited regenerational capacity. Overall, most of the examined populations, except those of Acacia etbaica in wadi-bed and Blepharispermum hirtum, seemed to be under stress from both environmental and human factors, particularly in the wadi bed. This type of study can provide a basis for the development of a management plan to support the conservation and sustainable use of forest vegetation in an arid region.

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Stochasticity of individual competition and local matchup inequality for saplings in a niche‐structured forest

Hoshizaki

Takahashi

Tanaka

et al. 2022

Ecology

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Ecologists have recently accepted the notion that species coexistence involves both niche and neutral processes, but few studies have explained how both of these opposite views can explain coexistence in the same community. Here we focus on competition among sessile organisms and explored first the extent to which species-based niche reflects local "matchups" between nearby individuals, using 726 saplings of 10 temperate tree species, and second the members engaging in the matchups, which have rarely been quantified despite the importance in mixedspecies forests. Growth responses to light showed considerable species-level differences, suggesting commonly seen regeneration niches. Outcomes of the individual matchups were basically predictable from the species mean response, but also with substantial contribution of within-species variation. We found strong imbalance in matchup frequencies, such that some individuals meet more individuals of differing species but others meet fewer, as well as many isolated, competition-free ones. The niche and neutral processes appear to reflect, respectively, between-and within-species differences, and our findings suggest that even when niche segregation is discernible, the role of stochasticity for the frequency of local competition, as well as its outcomes, cannot be discounted in species coexistence.

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Coexistence of three canopy tree species in a riparian forest in the Chichibu Mountains, central Japan

Cited by 46 publications

References 20 publications

Age structure and dynamics of Cercidiphyllum japonicum sprouts based on growth ring analysis

Age structure and dynamics of Cercidiphyllum japonicum sprouts based on growth ring analysis

Population structure of woody plants in the arid cloud forests of Dhofar, southern Oman

Stochasticity of individual competition and local matchup inequality for saplings in a niche‐structured forest

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