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1.
Encarna Rodríguez-García Cristóbal Ordóñez Felipe Bravo 《Annals of Forest Science》2011,68(2):337-346
• Introduction
Shrubs are recognized as important tree regeneration niches. In this study, we experimentally analysed the effects of shrub presence, canopy cover (closed cover and open cover-gaps), and seedling size on Pinus pinaster growth. 相似文献2.
Introduction
The artificial regeneration of oaks (Quercus spp.) can supplement deficient natural regeneration, yet growth and physiology of newly planted seedlings are often negatively affected by animal herbivory. Alternative nursery stock types with improved stress resistance may help improve regeneration success. 相似文献3.
Andrea Cutini Paolo Bongi Francesco Chianucci Nives Pagon Stefano Grignolio Emilio Amorini Marco Apollonio 《Annals of Forest Science》2011,68(4):667-674
Introduction
Roe deer (Capreolus capreolus) browsing pressure on vegetative regeneration of Turkey oak (Quercus cerris) and chestnut (Castanea sativa) and roe deer use of coppiced areas were investigated. 相似文献4.
Victoria González-Rodríguez Rafael M. Navarro-Cerrillo Rafael Villar 《Annals of Forest Science》2011,68(3):637-646
Introduction
The limited ability of Quercus species to regenerate naturally in Mediterranean forests has led to the development of various artificial regeneration methods; however, there is no general consensus as to what specific method is the best one for this purpose. 相似文献5.
Background
How environmental factors affect forest regeneration is relevant for systems that depend partially or fully on natural regeneration. 相似文献6.
Micro-environmental factors viz., soil moisture and light intensity are important factors that affect natural regeneration
in forests. These factors vary spatially depending on the overhead canopy density of the forest. The present study focused
on studying the effect of variation of soil moisture and light intensity on natural regeneration of sal species (Shorea robusta) under different micro-environments due to overhead canopy of varying forest density. Experimental plots of 40m× 40m size
were laid under different overhead canopy densities in a small sal forested watershed in the foot hills of Himalayas in Nainital District of Uttarakhand State, India. The plots were monitored
on a long term basis for soil moisture at multi depths, light intensity and natural regeneration of sal. The results of the study revealed that the natural regeneration was highest under C1 (up to-0.30) canopy followed by C2
(0.30–0.50), and C3 (0.50–0.70) canopies. The C3 canopy showed the dying back of sal shoots over 4 years of study. The highest R2 value of linear regression between incremental score of plot regeneration and average soil moisture content was obtained
as 0.156 for average soil moisture content during non-monsoon months at 100 cm depth. The R2 value between incremental score of plot regeneration and annual average light intensity was obtained as 0.688 which indicated
that the regeneration is largely dependent on the light intensity conditions during the year. The multiple linear regression
analysis between the incremental score of regeneration and the average light intensity and average soil moisture content revealed
that that about 80% of variation in regeneration is explained by both the factors. 相似文献
7.
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• Construction cost (g glucose g−1), chemical composition and morphology of leaves of beech (Fagus sylvatica L.) and two co-occurring valuable broadleaved species (sycamore maple — Acer pseudoplatanus L. — and ash — Fraxinus excelsior L.) were investigated along a horizontal light gradient (3–60% of above canopy radiation) and from top to bottom within the
crowns in a fairly even-aged mixed-species thicket established by natural regeneration beneath a patchy shelterwood canopy. 相似文献
8.
9.
Faruk Bogunić Sonja Siljak-Yakovlev Edina Muratović Fatima Pustahija Safer Medjedović 《Annals of Forest Science》2011,68(1):179-187
• IntroductionThe most common representatives of the European mountain pine complex (Pinus mugo s.l.) are P. mugo s.s. and Pinus uncinata. 相似文献10.
Tarin Toledo-Aceves Silvia Purata-Velarde Charles M. Peters 《Forest Ecology and Management》2009,258(11):2481-2489
One of the main threats to the sustainability of community forestry in the Selva Maya is insufficient regeneration of commercial tree species. We evaluated the regeneration status of 22 commercial tree species in a managed semideciduous tropical rain forest in Southern Mexico. The study was carried out in six harvesting areas along a 16-year chronosequence. In each area, 10 transects (1000 m2) were established and all trees >50 cm height and <10 cm diameter were recorded. We evaluated the relationships between seedling and sapling abundance, and canopy cover and disturbance condition (closed forest, canopy gap, log landing, skid road, primary road and secondary road). The area occupied by closed forest canopy increased with age of harvesting area (65–91% of sampled area), while the area occupied by canopy gaps decreased (22–9%). Log landings occupied less than 1% of the sampled area. The predominant canopy cover was 75–80% in all harvesting areas, even in the most recently harvested areas. The highest densities of seedlings and saplings, of both shade tolerant and intolerant species, were found in log landing and skid trails, followed by secondary roads. Even Simarouba glauca, a shade tolerant species, displayed higher densities in sites with ≤65% of canopy cover. Our results support previous findings and indicate that the levels of disturbance caused by existing harvesting procedures may be inadequate to promote sufficient regeneration of not only light demanding desirable species but also for some of the evaluated shade tolerant species of commercial interest. Seedling and sapling densities exhibited by Swietenia macrophylla, for example, are insufficient to support current harvesting rates. The application of a spatial mixed system with patch-cuts of different sizes, a consequence of group felling, could be applied to provide the necessary conditions for the regeneration of the main commercial species. 相似文献
11.
David Paul Blackburn Matthew G. Hamilton Chris E. Harwood Trevor C. Innes Bradley M. Potts Dean Williams 《Annals of Forest Science》2011,68(7):1187-1195
• IntroductionThere is increasing interest in managing Eucalyptus nitens plantations for sawn timber production. 相似文献12.
Victoria González-Rodríguez Rafael Villar Raquel Casado Elena Suárez-Bonnet José Luis Quero Rafael M. Navarro-Cerrillo 《Annals of Forest Science》2011,68(7):1217-1232
IntroductionThe great spatial and temporal heterogeneity of Mediterranean ecosystems can influence establishment success in woody species, whose natural regeneration occurs to a very small extent. In this work, the effect of the spatial pattern of environmental variables (light availability, soil moisture and herbaceous production) on seedling emergence, growth, survival and establishment success was examined by using a spatially explicit approach. 相似文献13.
• IntroductionLaricio pine (Pinus nigra J.F. Arn. ssp. laricio (Poiret) Maire var Corsicana Hyl.) is a form of black pine endemic to Corsica, that may now be under threat due to current fire regimes and competition with maritime pine (Pinus pinaster Aiton). 相似文献14.
Patricia Delgado Daniel Piñero Virginia Rebolledo Lev Jardón Francisco Chi 《Annals of Forest Science》2011,68(1):121-128
• IntroductionThe recognition of endangered species takes into account geographic isolation and small size of populations, as is the case of two populations of Pinus caribaea var. hondurensis distributed in México. 相似文献15.
François Pimont Jean-Luc Dupuy Rodman R. Linn Sylvain Dupont 《Annals of Forest Science》2011,68(3):523-530
IntroductionForest fuel management in the context of fire prevention generally induces heterogeneous spatial patterns of vegetation. However, the impact of the canopy structure on both wind flows and fire behavior is not well understood. 相似文献16.
Nobumasa Bito Ryogo Nakada Eitaro Fukatsu Yasuyuki Matsushita Kazuhiko Fukushima Takanori Imai 《Annals of Forest Science》2011,68(6):1049-1056
• IntroductionIn Cryptomeria japonica, heartwood properties are considered to be affected by specific extractives. It remains unclear whether traits of specific heartwood compounds are under genetic control. 相似文献17.
Ikutaro Tsuyama Katsuhiro Nakao Tetsuya Matsui Motoki Higa Masahiro Horikawa Yuji Kominami Nobuyuki Tanaka 《Annals of Forest Science》2011,68(4):689-699
IntroductionThe aims of this study were to identify the climatic conditions controlling the distribution of Sasamorpha borealis and to assess the impact of climate change on the species in Japan. 相似文献18.
• BackgroundThe Holm oak (Quercus ilex ssp. ballota [Desf.] Samp.) is an evergreen tree widely distributed in the western Mediterranean Basin. Forest restoration programs using this species have enjoyed only limited success, and knowledge concerning the effect of fertilization on plant quality and post-transplantation response is sparse. 相似文献19.
José Ramón Arévalo Pelayo Álvarez Nelmi Narvaez Kenny Walker 《Journal of Forest Research》2009,14(2):81-87
Wildfire is an important element in the dynamics of the blue oak (Quercus douglasii) stand. We evaluated the effect of fire in the regeneration of a stand in Quail Ridge. This protected area is located on
a peninsula formed by the flooding of Berryessa Valley (California) which has helped it maintain many elements of the native
flora. Major vegetation types are blue oak woodland and forest (Q. douglasii, Fagaceae), chamise chaparral (Adenostoma fasciculatum, Rosaceae), and grasslands. In the blue oak stand, 14 plots were randomly located: seven in the burned area and seven outside
of the burned areas (control). The effect of fire on sexual regeneration, asexual regeneration, mortality and species composition
was analyzed. The fire caused changes in canopy cover, soil cover and litter cover. Asexual regeneration was significantly
favored by the fire, but the effect on sexual regeneration was not significant. Fire caused a significant reduction in the
basal area of Q. wislizeni and Arctostaphylos manzanita and a reduction in the density of Heteromeles arbutifolia. We concluded that fire does not have a significant effect on the sexual regeneration of Q. douglasii or Q. wislizeni. Fire does stimulate asexual regeneration in both species of oaks, but grazing reduces the regenerative effect of fire. Fire
increases regeneration of Arctostaphylos manzanita and Heteromeles arbutifolia by stimulating asexual and sexual regeneration. The occupancies of these chaparral species are further enhanced by their
lower palatability compared to both species of oaks. 相似文献
20.
IntroductionKnowledge of vertical variation in hydraulic parameters would improve our understanding of individual trunk functioning and likely have important implications for modeling water movement to the leaves. Specifically, understanding how foliage area (A l), sapwood area (A s), and hydraulic specific conductivity (k s) vary with canopy position to affect leaf-specific conductivity (LSC) and whole-tree leaf-specific hydraulic conductance (K l) may explain some of the contrasting patterns of A l/A s reported in the literature. 相似文献 |