The influence of the bamboo Yushania microphylla on regeneration of Abies densa in central Bhutan
- 1 October 1999
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Forest Research
- Vol. 29 (10), 1518-1527
- https://doi.org/10.1139/x99-125
Abstract
To assess the impact of a dense understory of the bamboo Yushania microphylla Munro on tree regeneration in monospecific Abies densa Griff. stands of the central Bhutan Himalayas, the age-class distribution of fir regeneration, the microsite preferences, and height growth as well as the relationship between height of the bamboo, gap fraction, and tree seedling density were studied. Seedling densities were much lower on sites with bamboo. Recruitment was more or less continuous, and there was no indication of overall synchronized single-cohort regeneration in bamboo plots. On sites with bamboo understory, the light regime at the forest floor is strongly influenced by the height of the bamboo. A large portion of the variance of tree seedling density could be explained by the height of the bamboo. The mortality of fir seedlings is considerably reduced at elevated microsites. Fir establishment on the forest floor is restricted to sites where bamboo density is low and light levels are higher. On sites with dense, unbrowsed bamboo, light levels are too low for long-term survival of fir seedlings, resulting in a lack of suppressed regeneration with minimal height growth. Because of the absence of this fraction, the average height increment of fir seedlings is higher on sites with bamboo.Keywords
This publication has 38 references indexed in Scilit:
- THE INTERPLAY OF FACILITATION AND COMPETITION IN PLANT COMMUNITIESEcology, 1997
- Competition and Facilitation: Contrasting Effects of Artemisia Tridentata on Desert vs. Montane PinesEcology, 1996
- Age structure and response to fine-scale disturbances of Abiessachalinensis, Piceajezoensis, Piceaglehnii, and Betulaermanii growing under the influence of a dwarf bamboo understory in northern JapanCanadian Journal of Forest Research, 1996
- Positive interactions among plantsThe Botanical Review, 1995
- Competition vs. Facilitation of Tree Seedling Growth and Survival in Early Successional CommunitiesEcology, 1995
- Effects of overtopping vegetation on light availability and growth of Engelmann spruce (Piceaengelmannii) seedlingsCanadian Journal of Forest Research, 1993
- Conifer-seedling success and microclimate at different levels of herb and shrub cover in a Rhododendron–Vaccinium–Menziesia community of south central British ColumbiaCanadian Journal of Forest Research, 1991
- Tree Seedlings on Logs in Picea‐Tsuga Forests of Oregon and WashingtonEcology, 1989
- Ecology of Coarse Woody Debris in Temperate EcosystemsPublished by Elsevier BV ,1986
- Mechanisms of Succession in Natural Communities and Their Role in Community Stability and OrganizationThe American Naturalist, 1977