Efficiency of nutrient use for biomass production of a Eucalyptus clone as a function of planting density in short-rotation cropping

2020 ◽  
Vol 83 (2) ◽  
pp. 66-74
Author(s):  
P. L. Medeiros ◽  
G. G. C. Silva ◽  
E. M. M. Oliveira ◽  
C. O. Ribeiro ◽  
J. M. S. Silva ◽  
...  
Keyword(s):  
Biomass Production ◽  
Planting Density ◽  
Short Rotation ◽  
Nutrient Use ◽  
Eucalyptus Clone

scholarly journals Population dynamics of willow coppice systems and their implications for management of short-rotation forests

1993 ◽  
Vol 69 (6) ◽  
pp. 699-704 ◽  
Author(s):  
Eva Willebrand ◽  
Theo Verwijst
Keyword(s):  
Population Dynamics ◽  
Key Words ◽  
Biomass Production ◽  
Planting Density ◽  
Relative Variation ◽  
Frequency Distributions ◽  
Short Rotation ◽  
Clonal Composition ◽  
Spacing Length ◽  
Key Words Biomass

Spacing, length of rotation and clonal composition of Salix coppice systems determine the degree of within-stand competition and thereby the dynamics of the populations. Three general effects of competition are identified and their dependence on planting design and management is illustrated. (1) The dependence of yield on initial planting density disappears at higher densities and becomes weaker at low densities in later rotations. (2) The development of a competitive hierarchy between stools is reflected by a temporal increase of skewness and relative variation in weight frequency distributions. (3) Mortality of stools due to self-thinning is enhanced by high planting density and longer cutting cycles. Furthermore, the relative performance of clones in a mixture cannot be predicted from their performance in pure stands. Key words: Biomass production, Clone mixture, Competition, Rotation length, Salix, Self-thinning, Spacing, Willow coppice

Efficiency of micronutrients and sodium use of a Eucalyptus clone as a function of planting density in short-rotation cropping

2021 ◽  
pp. 1-9
Author(s):  
P. L. de Medeiros ◽  
A. S. Pimenta ◽  
G. G. C. da Silva ◽  
E. M. M. de Oliveira ◽  
D. N. da Silva Júnior ◽  
...  
Keyword(s):  
Planting Density ◽  
Short Rotation ◽  
Eucalyptus Clone

scholarly journals Direct Assessment of Biomass Productivity in Short Rotation Forestry (SRF) with the Terrestrial Laser Scanner (TLS). Case of Study in NE Part of Romania (Preliminary Results)

2020 ◽  
Vol 3 (1) ◽  
pp. 93
Author(s):  
Iulian Constantin Dănilă
Keyword(s):  
Biomass Production ◽  
Laser Scanner ◽  
Biomass Productivity ◽  
Tree Height ◽  
Allometric Equations ◽  
Accurate Information ◽  
Terrestrial Laser Scanner ◽  
North East ◽  
Short Rotation ◽  
Destructive Methods

Short rotation forestry (SRF) provides an important supply of biomass for investors in this area. In the NE (North-East) part of Romania at the present time are installed over 800 Ha of this kind of crops. The SRF enjoys the support through environmental policies, in relation to climate change and the provisions of the Kyoto Protocol to reduce the concentration of CO2 in the atmosphere. A precise estimate of biomass production is necessary for the sustainable planning of forest resources and for the exchange of energy in ecosystems. The use of the terrestrial laser scanner (TLS) in estimating the production of above ground wood biomass (AGWB) of short rotation forestry (SRF) brings an important technological leap among indirect (non-destructive) methods. TLS technology is justified when destructive methods become difficult to implement, and allometric equations do not provide accurate information. The main purpose of the research is to estimate the biomass productivity on tree parts in short rotation forestry with TLS technology. Measuring the hybrid poplars crops by TLS may have the following consequences: (1) Higher accuracy of the estimate of biomass production in the SRF; (2) cost and time effective measurements over the biomass of tree parts; (3) new and validated allometric equations for SRF in NE Romania; (4) solid instrument for industry to estimate biomass. TLS technology gives accurate estimates for DBH, tree height and location, as much as the volume on segments, commercial volume or crown volume can be determined. The accuracy of these values depends on the original scan data and their co-registration. The research will contribute to the development of knowledge in the field of hybrid crops.

scholarly journals Poplar breeding for the purpose of biomass production in short rotation periods in Germany: Problems and first findings

1993 ◽  
Vol 69 (6) ◽  
pp. 727-729 ◽  
Author(s):  
Horst Weisgerber
Keyword(s):  
Biomass Production ◽  
Plant Material ◽  
High Yield ◽  
Land Utilization ◽  
Rotation Periods ◽  
Short Rotation ◽  
European North ◽  
Basic Plant ◽  
Poplar Breeding ◽  
First Results

Investigations so far on the suitability of poplars for biomass production in short rotation periods in Germany were conducted almost exclusively with clones conceived for conventional cultivation. To introduce improved plant material, a special breeding program was implemented in Hann. Münden. It takes into consideration the most important criteria of suitability for the new form of land utilization. A report is given on findings so far from the realization of this program. Comprehensive basic plant material is available for European, North American and East Asian species from the sections Aigeiros, Leuce and Tacamahaca. Interspecific crossings are being carried out mainly in order to make the best possible use of combination and heterosis effects. A period of at least 20 years is necessary to develop new cultivars with high yield performance and yield stability. First results are presented on hybrids of species which are site-tolerant, resistant and particularly fast-growing at the juvenile phase. Plans to produce multiclonal varieties, each with 5 to 10 suitable clones with the same growing rhythm are in place. Special cultivation recommendations advocate clonal mixtures for each of the most important site units and for different rotation periods of from 2 to 5, 6 to 10 and more than 10 years. Key words: poplar, breeding, biomass, short rotation

The Energy Efficiency Of Willow Biomass Production In Poland – A Comparative Study

2015 ◽  
Vol 22 (1) ◽  
pp. 123-130 ◽  
Author(s):  
Stefan Szczukowski ◽  
Józef Tworkowski ◽  
Mariusz J. Stolarski ◽  
Michał Krzyżaniak
Keyword(s):  
Energy Efficiency ◽  
Comparative Study ◽  
Biomass Production ◽  
Field Experiments ◽  
Energy Gain ◽  
Short Rotation ◽  
Energy Inputs ◽  
The University

Abstract Field experiments with willow (Salix L.) coppice cultivation and Eko-Salix systems have been conducted at the University of Warmia and Mazury since 1992. In that wider context, the aim of the work described here was to compare energy inputs involved in setting up a plantation and producing biomass, and to assess the efficiency of willow-chips production under the coppice and Eko-Salix systems. The energy gain determined in the experiments was several to more than twenty times as great as the inputs needed to operate the plantation and to harvest willow biomass, this leaving both systems of willow cultivation under study attractive where setting up short-rotation coppices is concerned.

Silver Maple Seed Sources for Increased Biomass Production

1988 ◽  
Vol 5 (3) ◽  
pp. 180-184 ◽  
Author(s):  
Richard F. Kopp ◽  
Wayne A. Geyer ◽  
William R. Lovett
Keyword(s):  
Biomass Production ◽  
Great Plains ◽  
Height Growth ◽  
Seed Source ◽  
Stem Number ◽  
Seed Sources ◽  
Short Rotation ◽  
Silver Maple ◽  
South Central ◽  
Maple Seed

Abstract Silver maple shows promise for use in short-rotation intensive culture energy plantings. A seed source study composed of trees from 26 midwest locations was established in south-central Nebraska in 1979 to determine where silver maple seed should be collected for use in the central Great Plains. Trees were evaluated for survival, height growth, and number of dominant stems per tree during their seventh growing season. Sources from eastern Nebraska, western Iowa, eastern Kansas, and northwest Missouri generally exhibited the greatest survival, height growth, and number of dominant stems. Height growth appears to be under stronger genetic control than stem number, suggesting that selection for height should take priority when selecting trees for biomass production. Geographic trends related to survival and height growth, but not stem number, were observed. Environmental or geographic factors that are strong predictors of seed source performance could not be identified. Planting the most locally produced seed is advisable for the central Plains. North. J. Appl. For. 5:180-184, Sept. 1988.

Growth potential of different species and genotypes for biomass production in short rotation in Mediterranean environments

2015 ◽  
Vol 354 ◽  
pp. 291-299 ◽  
Author(s):  
Hortensia Sixto ◽  
Isabel Cañellas ◽  
Joost van Arendonk ◽  
Pilar Ciria ◽  
Francesc Camps ◽  
...  
Keyword(s):  
Biomass Production ◽  
Growth Potential ◽  
Short Rotation ◽  
Mediterranean Environments

scholarly journals Growth, Biomass Production and Root Development of Chinese fir in Relation to Initial Planting Density

Forests ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 236 ◽  
Author(s):  
Taimoor Farooq ◽  
Wenjing Wu ◽  
Mulualem Tigabu ◽  
Xiangqing Ma ◽  
Zongming He ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Biomass Production ◽  
Stand Density ◽  
Tree Height ◽  
Root Systems ◽  
Chinese Fir ◽  
High Density ◽  
Planting Density ◽  
Low Density ◽  
Intermediate Density

Chinese fir (Cunninghamia lanceolata (Lamb) Hook) is a commercially valuable timber species that is widely planted in southern China and accounts for 6.1% of the global plantation forests. However, appropriate planting density that ensures high plantation productivity is largely unexplored in this species. The aim of the study was to examine tree growth, biomass production, and its allocation among different organs in relation to initial planting density, and to examine whether planting density has an impact on root development. Mortality, diameter at breast height and tree-height of all trees were determined and measured in wider (2.36 × 2.36 m), intermediate (1.83 × 1.83 m) and narrow (1.44 × 1.44 m) spacing with stand density of 1450 trees ha−1, 2460 trees ha−1 and 3950 trees ha−1, respectively. In each stand, three plots of 20 × 20 m at a distance of 500 m were delineated as the sampling unit. Biomass was determined by destructive sampling of trees in each stand and developing allometric equations. Root morphological traits and their spatial distribution were also determined by carefully excavating the root systems. The results showed an increase in diameter of trees with decreasing stand density while tree height was independent of stand density. Biomass production of individual trees was significantly (p < 0.05) less in high-density stand (32.35 ± 2.98 kg tree−1) compared to low-density stand (44.72 ± 4.96 kg tree−1) and intermediate-density stand (61.35 ± 4.78 kg tree−1) while stand biomass production differed significantly in the order of intermediate (67.63 ± 5.14 t ha−1) > high (57.08 ± 3.13 t ha−1) > low (27.39 ± 3.42 t ha−1) stand density. Both average root length and root volume were significantly (p < 0.05) lower in the high-density stand than stands with low and intermediate density. Analysis of spatial distribution of root systems revealed no overlap between roots of neighboring trees in the competition zone in low-density stand, a subtle overlap in the intermediate density stand and larger overlap in the high-density stand. It can be concluded that better growth and biomass production in intermediate density stand could be explained by better root structural development coupled with minimal competition with understory vegetation and between trees; thus intermediate stand density can be optimal for sustaining long-term productivity and may reduce the management cost in the early phase of the plantation.

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