Showing papers in "Forest Ecology and Management in 1990"

TL;DR: In this article, a process-based model is described and applied to a range of Pinus radiata D. The model requires inputs of daily weather data (maximum and minimum air temperatures and rainfall), physical characteristics of the site (longitude, latitude, rootzone depth and relationship between root-zone soil matric potential and volumetric water-content) and crop (stocking, crown dimensions and leaf-area index).

TL;DR: Differences in hardwood leaves suggest that acclimation to light regime exists for species representing a broad range of tolerances, and that differences in sun-shade leaf structure among species may vary with shade tolerance.

TL;DR: In this article, the magnitude and duration of response of southern pine forests to operations silvicultural treatments including site preparation, drainage, bedding, weed control, thinning, and fertilization are reviewed.

TL;DR: The reproductive processes and environmental requirements for regenerating Betula alleghaniensis, B. papyrifera, P. pendula, and B. pubescens are reviewed and the Eurasian birches from mycorrhizal relationships with many symbionts that markedly improve growth and survival are reviewed.

TL;DR: Seed storage, by both conventional and cryogenic technologies, offers a relatively cheap method of conserving a broad range of germplasm, and will likely play an essential, complementary role, in germ plasm conservation as temporary conservation until ex-situ stands are established, and as a safety measure against disastrous losses for limited numbers of seedlots.

TL;DR: Eucalyptus globulus Labill as discussed by the authors has been planted as the main tree species in the central highlands of Ethiopia since 1895, and the mean annual growth of E. globulus in fuelwood plantations varies between 10 and 30 m3 ha−1 year−1.

TL;DR: In this article, the edge-to-interior gradients of woody vegetation were examined on northern and southern aspects of two sugar-maple/beech forest fragments that differed in cultural history.

TL;DR: In this paper, the authors measured dry bulk density, steady-state infiltrability and sorptivity after manual and crawler-tractor timber extraction in different watersheds on Orthic Acrisol and Gleyic Podsol (10% clay, 80% sand).

TL;DR: The relative tolerance of red oak to low resource levels and morphology suggests adaption to moderately unproductive environments (stress-tolerant strategy), while the characteristics of yellow-poplar suggests adaptation to more productive environments (competitive strategy).

TL;DR: In this paper, three key issues are analysed competition for site resources: opportunity for and consequence of rapid development of canopy during free-growing stage; and the production and configuration of the root system.

TL;DR: Adaptations which assist trees to survive in dry and nutrient-deficient environments are discussed and differences in the biochemical involvement of nutrients at the cellular and subcellular level which contribute to differences in nutrient-use efficiency in trees are discussed.

TL;DR: In this paper, soil N mineralization was measured in situ for 2 consecutive years along a 2000-m altitudinal gradient encompassing six vegetation types in northern California, and both anaerobic and aerobic field incubations showed that soil temperature and moisture strongly controlled N release.

TL;DR: Wood biomass data obtained from destructive stem samples from Central and Copperbelt areas of Zambia were used to develop regression models for estimating dry weights of woody biomass components from stem-diameter data and leaf biomass was not significantly different between coppiced plots aged 7–29 years and old-growth miombo woodland plots.

TL;DR: The synergy between climate change and habitat destruction would threaten many more species than either factor alone as discussed by the authors, and therefore ranges of even many widespread species are likely to show a net decrease during the next century.

TL;DR: In this article, the authors measured soil respiration in immature aspen (Populus tremuloides Michx. and P. grandidentata Michx.) ecosystems of eastern Ontario subjected to cutting and burning treatments in relation to vernal leaf flush.

TL;DR: In this paper, the authors examined the factors controlling litter decomposition of eleven species of leaf litter in the Hoh Rain Forest, Olympic National Park, Washington, using the litter-bag method.

TL;DR: In this paper, a review of investigations which address changes in morphological characteristics and carbon assimilation rates under short-term flooding and/or salinity conditions is presented, showing that increased flooding and saltwater intrusion, a problem facing U.S. Golf Coast bottomland forests, can cause drastic reduction in net carbonassimilation, leaf burning and seedling mortality.

TL;DR: In this article, the authors studied the relationship between water availability and vegetation and found that changes in leaf area, such as thinning and understory control, may have dramatic effects on both.

TL;DR: In this paper, the upper C-horizon was analyzed in 19 beech and oak stands in southern Sweden over a period of 40 years, and the results confirmed a study of ten other stands of the same period.

TL;DR: Bamon deficiency of forest trees occurs in many countries, notably in exotic plantations of eucalyptus and pines, but also in plantations and natural stands of native species on soils altered by macronutrient fertilization, fire or erosion.

TL;DR: An investigation was carried out to estimate root and microbial contribution to total soil respiration in a mixed deciduous tropical forest on a hillock from Orissa, India as discussed by the authors.

TL;DR: In this paper, the effects of whole-tree clearcutting are studied in three major forest types in the northeastern United States: a spruce-fir forest in central Maine, a northern hardwood forest in New Hampshire, and a central hardwood Forest in Connecticut.

TL;DR: The U.S. Fish and Wildlife Service is conducting an inventory of the wetlands of the United States through its National Wetlands Inventory Project (NWI), after considering alternative remote-sensed data sources, the NWI selected high-altitude aerial photography (1:40 000 to 1:130 000 scale) as its primary data source.

TL;DR: Kahn and Mejia as mentioned in this paper conducted a survey of palm communities in wetland forest ecosystems of Peruvian Amazonia, and found that palm diversity is very low in the forests which are periodically flooded by blackwater streams (tahuampa); palm density, however, is often high with a characteristic patchy distribution due to clustered species.

TL;DR: The vertical and horizontal distribution of needle-area density (nad ) within the crowns of Pinus radiata trees is described with a two-dimensional beta function in this paper, where it was found that the maximum nad within the tree crown can be up to four times larger than the average nad.

TL;DR: High-yield plantations can make a valuable contribution to the conservation and sustained use of forest ecosystems as mentioned in this paper. But, despite the pressing reasons for conserving forest resources, population growth creates pressures for exploiting them.

TL;DR: In this article, a study of Pinus radiata growing on a yellow podzolic soil which had a low water-holding capacity was conducted for four years (1983-1987).

TL;DR: At age 4, the growth response due to increased nutrient supply was 13–29 times that of the best genetic response within F0H0 trees of the four slash-pine progenies of the southern hemisphere.

TL;DR: The birches are most commonly regenerated using even-aged systems, primarily clearcutting as mentioned in this paper, and the optimum proportion of birch in mixed stands is 17-25%.