Some ecological aspects of Sitka spruce

1987 ◽  
Vol 93 (1-2) ◽  
pp. 85-92 ◽  
Author(s):  
D. C. Malcolm
Keyword(s):  
Sitka Spruce ◽  
Climatic Variables ◽  
Stand Dynamics ◽  
Soil Conditions ◽  
Atmospheric Humidity ◽  
Natural Distribution ◽  
Potential Production ◽  
Natural Stand ◽  
Ecological Aspects ◽  
Accumulated Temperature

SynopsisThe general adaptations of the species are described in relation to the environment of its natural distribution and are shown to be well suited to its use as an exotic in forestry. What is known of natural stand dynamics has little relevance to the cultivation of the species in pure plantations but the interaction with climate and soils is important in determining the limits to its growth and in prediction of productivity. Atmospheric humidity, windiness and accumulated temperature appear to be the most influential climatic variables and, given adequate soil conditions, can be used to give good estimates of potential production. Sitka spruce flowers freely and regenerates readily, demonstrating its ability to survive unaided in British conditions.

Sitka spruce (Picea sitchensis) in North America with special reference to its role in British forestry

1987 ◽  
Vol 93 (1-2) ◽  
pp. 1-12 ◽  
Author(s):  
L. Roche ◽  
P. G. Haddock
Keyword(s):  
Genetic Variation ◽  
North America ◽  
Special Reference ◽  
Picea Glauca ◽  
Natural Habitat ◽  
Sitka Spruce ◽  
Picea Sitchensis ◽  
Natural Distribution ◽  
Queen Charlotte Islands ◽  
Genetic Potential

SynopsisThe natural distribution of Sitka spruce is examined in relation to the species' role in British forestry. Particular attention is therefore given to a description of habitats on the Queen Charlotte Islands, and also on the adjacent mainland of British Columbia where Sitka spruce is sympatric with white spruce (Picea glauca) and hybridisation occurs. Examples of genetic variation are given and it is suggested that a knowledge of the genecologv of the species in its natural habitat would help to elucidate its full ecological and genetic potential in Britain.

scholarly journals ECOLOGICAL ASPECTS OF FORMATION OF HIGHEFFICIENT LEGUME–RHIZOBIAL SYSTEMS OF GLYCІNE MAX–BRADYRHІZOBІUM JAPONІCUM

2010 ◽  
Vol 10 ◽  
pp. 65-72
Author(s):  
V.V. Moskalets
Keyword(s):  
Positive Influence ◽  
Soil Conditions ◽  
Ecological Aspects ◽  
Productive Systems

It was established, that alochtonic microbiota is virulent, competitive, suitable to different grades makrosymbiont, resistant to abiotical factors, in particular climate and soil conditions as comparing to the autochtonic (native) microbiota, that had a positive influence on indicators of productivity of system Glycіne max-Bradyrhіzobіum japonіcum M 8. It was established, that at optimum sowing terms (May, 5-15, application of the microbial preparations and use of ultra early and early cultivars of a soybean, it is possible to ensure formation of highly productive systems «Glycіne max–Bradyrhіzobіum japonіcum М8» in the conditions of a transitive zone of Forrest-Steppe–Polissya.

Ecology and biogeography of Cassia brewsteri: assessment of potential sites for cultivation

2002 ◽  
Vol 42 (8) ◽  
pp. 1071 ◽  
Author(s):  
D. C. Cunningham ◽  
E. R. Anderson ◽  
K. B. Walsh
Keyword(s):  
Field Studies ◽  
Soil Conditions ◽  
Limiting Factor ◽  
Climate Modelling ◽  
High Survival ◽  
Vegetation Types ◽  
Natural Distribution ◽  
Potential Source ◽  
Survival And Growth ◽  
Ecological Parameters

Cassia brewsteri (F. Muell.) F. Muell. ex Benth. has been identified as a potential multipurpose agroforestry species, and also as a potential source of seed galactomannans (industrial gums). In this study, the natural and cultivated distributions of C. brewsteri were used as a basis for predicting potential sites for cultivation of the tree, using the climate modelling software ANUCLIM. The natural distribution was determined by compilation of data from herbaria and from field studies. The ecological parameters of natural occurrences were characterised in terms of soil and vegetation types by sampling 113 sites throughout the natural distribution in Queensland (18.583–26.150°S, 144.750–152.750°N). In addition to the natural occurrences, a further 11 sites were identified where the tree has been grown successfully in cultivation. Failures of the tree in agroforestry trials in Thailand may be explained by high temperature as a limiting factor in the distribution of the species. Failures of the species in trials in Australia, Zimbabwe and Malawi could not be attributed to climate or soil conditions at the trial sites, indicating that further research on culture of the tree is required to achieve high survival and growth rates.

Structure and physiology of Sitka spruce roots

1987 ◽  
Vol 93 (1-2) ◽  
pp. 131-144 ◽  
Author(s):  
M. P. Coutts ◽  
J. J. Philipson
Keyword(s):  
Relative Size ◽  
Local Environment ◽  
Sitka Spruce ◽  
Lateral Spread ◽  
Soil Conditions ◽  
Soil Environment ◽  
Nitrogen And Phosphorus ◽  
Tree Stability ◽  
Primary Roots ◽  
Survival And Development

SynopsisThe growth and development of Sitka spruce roots is reviewed against the practical background of tree stability. Two features of the roots which make Sitka spruce liable to windthrow on upland sites are the shallow development in unfavourable soil conditions, and restricted lateral spread and anchorage caused by some forms of cultivation. Responses to different aspects of the soil environment are discussed, with emphasis on mineral nutrition, drying of the soil, waterlogging and temperature. The development of a small number of major woody roots from an assortment of primary laterals on the transplant occurs at an early age and is determined both by the relative size and vigour of the primary roots and by their local environment. The roots, which respond to increases in nitrogen and phosphorus supply with enhanced growth, are sensitive to drying of the soil and are particularly so to waterlogging, but they show no unusual response to soil temperature. Adventitious roots can play a role in the survival and development of the root system.

New endemic species of Manihot (Euphorbiaceae) from Serra do Tombador in Goiás, Central Brazil

Phytotaxa ◽  
2016 ◽  
Vol 273 (3) ◽  
pp. 147 ◽  
Author(s):  
J. MOISES MENDOZA F. ◽  
MARCELO F. SIMON ◽  
TALITA S. REIS ◽  
ALESSANDRA FIDELIS ◽  
TACIANA B. CAVALCANTI
Keyword(s):  
New Species ◽  
New Taxa ◽  
Endemic Species ◽  
Related Species ◽  
Morphological Characteristics ◽  
Natural Distribution ◽  
Closely Related Species ◽  
Central Brazil ◽  
Ecological Aspects ◽  
Three New Species

Extensive botanical explorations focused on the taxonomy and phylogeny of the genus Manihot in the Cerrado biome permitted the finding of three new species restricted to Serra do Tombador in the municipality of Cavalcante, Goiás state, of Brazil. Manihot ebracteata, Manihot purpurea and Manihot tombadorensis, are described and illustrated. Morphological characteristics of the new taxa, relationships with closely related species, as well as comments on ecological aspects and natural distribution for each species, are provided.

Emergency Seasoning of Sitka Spruce

1919 ◽  
Vol 87 (2269supp) ◽  
pp. 404-405
Author(s):  
L. A. Welo
Keyword(s):  
Sitka Spruce
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