scholarly journals Growth and yield characteristics according to tree species in the log cultivation of Pleurotus pulmonarius

2016 ◽  
Vol 14 (3) ◽  
pp. 105-110
Author(s):  
Jae-Hong Lee ◽  
Nam-Gil Lee ◽  
Youn-Gi Mun ◽  
Tae-Sung Jeong ◽  
Sun-Bae Kwon ◽  
...  
Keyword(s):  
Tree Species ◽  
Growth And Yield ◽  
Pleurotus Pulmonarius ◽  
Log Cultivation

Ontario's forest growth and yield modelling program: Advances resulting from the Forestry Research Partnership

2008 ◽  
Vol 84 (5) ◽  
pp. 694-703 ◽  
Author(s):  
Mahadev Sharma ◽  
John Parton ◽  
Murray Woods ◽  
Peter Newton ◽  
Margaret Penner ◽  
...  
Keyword(s):  
Tree Species ◽  
Stand Density ◽  
Forest Growth ◽  
Growth And Yield ◽  
Research Partnership ◽  
Wood Supply ◽  
Permanent Sample Plots ◽  
Forestry Research ◽  
Research Activities ◽  
Forest Growth And Yield

The province of Ontario holds approximately 70.2 million hectares of forests: about 17% of Canada’s and 2% of the world’s forests. Approximately 21 million hectares are managed as commercial forests, with an annual harvest in the early part of the decade approaching 200 000 ha. Yield tables developed by Walter Plonski in the 1950s provide the basis for most wood supply calculations and growth projections in Ontario. However, due to changes in legislation, policy, and the planning process, they no longer fully meet the needs of resource managers. Furthermore, Plonski`s tables are not appropriate for the range of silvicultural options now practised in Ontario. In October 1999, the Canadian Ecology Centre- Forestry Research Partnership (CEC-FRP) was formed and initiated a series of projects that collectively aimed at characterizing, quantifying and ultimately increasing the economically available wood supply. Comprehensive, defensible, and reliable forecasts of forest growth and yield were identified as key knowledge gaps. The CEC-FRP, with support from the broader science community and forest industry, initiated several new research activities to address these needs, the results of which are outlined briefly in this paper. We describe new stand level models (e.g., benchmark yield curves, FVS Ontario, stand density management diagrams) that were developed using data collected from permanent sample plots and permanent growth plots established and remeasured during the past 5 decades. Similarly, we discuss new height–diameter equations developed for 8 major commercial tree species that specifically account for stand density. As well, we introduce a CEC-FRP-supported project aimed at developing new taper equations for plantation grown jack pine and black spruce trees established at varying densities. Furthermore, we provide an overview of various projects undertaken to explore measures of site productivity. Available growth intercept and site index equations are being evaluated and new equations are being developed for major commercial tree species as needed. We illustrate how these efforts are advancing Ontario’s growth and yield program and supporting the CEC-FRP in achieving its objective of increasing the supply of fibre by 10% in 10 years while maintaining forest sustainability. Key words: permanent sample plots (PSPs), permanent growth plots (PGPs), normal yield tables, sustainable forest management, NEBIE plot network, forest inventory, Forest Vegetation Simulator

Estimation of potential impacts of climate change on growth and yield of temperate tree species

2013 ◽  
Vol 20 (1) ◽  
pp. 159-178 ◽  
Author(s):  
M. Irfan Ashraf ◽  
Charles P.-A. Bourque ◽  
David A. MacLean ◽  
Thom Erdle ◽  
Fan-Rui Meng
Keyword(s):  
Climate Change ◽  
Tree Species ◽  
Growth And Yield ◽  
Impacts Of Climate Change

scholarly journals Promising white poplar (Populus alba L.) clones in sandy ridges between the rivers Danube and Tisza in Hungary

2008 ◽  
Vol 14 (1-2.) ◽  
Author(s):  
K. Rédei ◽  
Zs. Keserű
Keyword(s):  
Significant Role ◽  
Tree Species ◽  
Important Task ◽  
Growth And Yield ◽  
Populus Alba ◽  
Wood Production ◽  
White Poplar ◽  
Stem Form ◽  
Forested Area

White poplar is a native stand-forming tree species in Hungary, covering 3.1 per cent of the forested area. More than 70 per cent of the white poplar stands can be found on calcareous sandy sites in the Danube—Tisza region, so they play a significant role in the poplar management of this part of the country. The most important task ahead of Hungarian poplar growers is to improve the quality of poplar stands and plantations based on selecting new clones and cultivars. The growth and yield of four promising white poplar clones was evaluated on a marginal site in central Hungary. The clones `1-1 425-4' (Populus alba x Populus alba), and 11 758' (Populus alba Mosonmagyaróvár 124) seem to be suitable for wood production, while the 427-3' (Populus alba x Populus alba cv. Bolleana) and 422-9' (Populus alba x Populus grandidentata) clones (with decorative stem form) could be better used for tree lines and ornamental plantations.

scholarly journals Multivariate Modelling for the Unexplained Relationships of tree Variables for Combretum hartmannianum

2021 ◽  
pp. 83-96
Keyword(s):  
Species Distribution ◽  
Tree Species ◽  
Abiotic Factors ◽  
Growth And Yield ◽  
Individual Tree ◽  
Spatial Variables ◽  
Stem Size ◽  
Crown Length ◽  
Sensing Applications ◽  
Canopy Area

Tree crown information contributes to the investigation of several key forest ecosystem attributes: biodiversity, productivity, sustainability, aesthetics, forest environment and wildlife. Recent remote sensing applications utilize estimation of either canopy cover or individual tree canopy area as a first stage towards timber volume. Measurement of CR size for each tree can be time-consuming and difficult to obtain in very dense stands and for very tall trees where the base of live crown is obscured. Studies have often shown that abiotic factors such as soil and topographic characteristics play a major role for species distribution. Moreover, space has been shown to be more important than environment in determining woody plant species distribution. However, trees show considerable variation and flexibility in their size of crowns, height and stem diameters. The tree stem size has its own adaptive significance to a tree. It must be strong enough to withstand the forces that act on it (weight of the tree and the drag exerted on it by the wind). The sizes, shapes and relative locations of crowns both determine and respond to the shading and constriction effects that characterize aboveground interactions between trees. The more important issue is that, whether stem diameter-at-breast height relationships with tree height, crown height, and crown diameter are the only factors that can be used to model growth and yield of trees, especially in case of natural forests and or mixed plantations with different species and sizes. This study investigates the potential for structural indices and other spatial measures to improve the prediction of crown radius and crown length for trees in natural woodlands. Field data were collected for Cambretum hartmannianum tree species from Elgarri natural forest reserve in Blue Nile State, Sudan, to test the performance of crown radius and crown length (height) models on the basis of allometric relationships with stem dimensions. A number of spatial and non-spatial variables were incorporated into modified crown dimension models. Coefficient of determination (R2) and relative bias were used to test the performance of the inclusion of spatial or non-spatial variables into the original models (using tree dimensions alone). Predictions of crown length and radius were found to be better after the incorporation of the spatial and non-spatial. Our results also confirm that not all estimation models are suitable for all forest, but subject to the local forest condition and composition. In this regard and for the studied tree species in the selected forest, Mi index is recommended for the estimation of crown radius, and DCL index for crown length.

scholarly journals Impact of planting density on wheat crop grown under different tree species in tarai agroforestry system of central himalaya, India

2018 ◽  
Vol 10 (1) ◽  
pp. 30-36
Author(s):  
Kavita Satyawali ◽  
Sumit Chaturvedi ◽  
Neema Bisht ◽  
V.C. Dhyani
Keyword(s):  
Tree Species ◽  
Eucalyptus Camaldulensis ◽  
Triticum Aestivum L ◽  
Agroforestry System ◽  
Growth And Yield ◽  
Planting Density ◽  
Melia Azedarach ◽  
Wheat Crop ◽  
Wheat Growth ◽  
Yield Attributes

A field trial based Agroforestry system was established at Pantnagar during Rabi season 2012-13 for predicting the effect of spacing on growth and yield of wheat (Triticum aestivum L.) under Eucalyptus camaldulensis and Melia azedarach. The experiment was carried out in split-plot design consisting of two tree species in main plot, viz, Eucalyptus camaldulensis and Melia azedarch and four spacing treatments in sub-plot viz, 3.0m×1.0m, 3.0m×1.5m, 3.0m×2.0m and 3.0m×2.5m with three replications. The wheat crop variety“UP-2338” was sown on December 06, 2012 and harvested on April 27, 2013. Among the tree species, the maximum (15.1 q /ha) and significantly higher grain yield with 21.8% increment was recorded under Melia as compare to Eucalyptus. Whereas, among the different spacings, the wheat growth in terms of dry biomass at 120 DAS (495.4/m2 ), yield attributes and yield in terms of grain (16.0 q/ha), straw (29.4 q/ha) and biological yield (45.4 q/ha) under Melia was significantly higher at 3 × 2.5 m spacing as compared to other planting density. The correlation coefficient (r) studies exhibited that wheat growth and yield attributing characteristics shows significantly (p<0.05) high degree (r=0.75 to 1) positive correlation with each other. The investigation was done to find out the proper planting density for intercropping of wheat with tree species without comprising the wheat growth and enhancing its sustainability.

scholarly journals 90Sr Content in the Stemwood of Forests within Ukrainian Polissya

Forests ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 270
Author(s):  
Andrii Bilous ◽  
Dmytrii Holiaka ◽  
Maksym Matsala ◽  
Valery Kashparov ◽  
Dmitry Schepaschenko ◽  
...  
Keyword(s):  
Tree Species ◽  
Forest Ecosystems ◽  
Growth Conditions ◽  
Growth And Yield ◽  
Energy Agency ◽  
Transfer Factors ◽  
Black Alder ◽  
90Sr Content ◽  
Lack Of Information ◽  
Geometrical Mean

The consequences of the Chernobyl disaster continue to threaten humans and ecosystems across fallout gradient in Northern Ukraine and nearby. Forest ecosystems contain substantial stocks of long-lived radionuclide 90Sr which was leached from the fuel matrix during the disaster. Nowadays, there is a lack of information about current transfer factors (TF) of this radionuclide from soil to the stemwood of native tree species. We have estimated 90Sr content in the forest stemwood of three tree species utilizing models of their growth and yield and collected woody samplings. TFs provided here vary greatly across studied tree species (18.0 × 2.1±1, 8.7 × 2.8±1, and 10.4 × 6.0±1 n × 10−3 m2·kg−1 (geometrical mean (GM) ± geometrical standard deviation, GSD) for the above species, respectively) and together with indicators of soil contamination allow us to reliably assess local stocks in the stemwood. Silver birch stands are estimated to deposit the highest 90Sr stocks. Herewith, at 25 years old Black alder stands could accumulate higher stocks (up to 35 MBq·ha−1) under rich growth conditions. TFs obtained in this study substantially exceed values provided by the International Atomic Energy Agency for studied tree species and thus could entail respective restrictions on use of firewood across large areas in Ukrainian Polissya. Data provided here may be harnessed to support decisions of respective stakeholders to provide credibly safe management of the contaminated forest ecosystems.

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