The viable seed content of some forest soil in coastal British Columbia

1970 ◽  
Vol 48 (7) ◽  
pp. 1383-1385 ◽  
Author(s):  
M. C. Kellman
Keyword(s):  
British Columbia ◽  
Forest Soil ◽  
Surface Soil ◽  
Coniferous Forest ◽  
Alnus Rubra ◽  
Viable Seed ◽  
Seed Content ◽  
Viable Seeds ◽  
Coastal British Columbia

The upper 10 cm of surface soil and litter beneath a coniferous forest in coastal British Columbia was found to contain over 1000 viable seeds per square meter. Alnus rubra Bong. made up 68.9% of all viable seed, although 18 other species, mainly weedy and secondary types, were recorded.

Hard-seed content of alfalfa grown in Canada

1991 ◽  
Vol 71 (2) ◽  
pp. 437-444 ◽  
Author(s):  
D. T. Fairey ◽  
L. P. Lefkovitch
Keyword(s):  
British Columbia ◽  
Geographic Location ◽  
Viable Seed ◽  
Hard Seed ◽  
Peace River ◽  
Seed Content ◽  
River Region ◽  
Hard Seeds ◽  
Viable Seeds ◽  
Production Areas

The hard-seed content of alfalfa (Medicago spp.) grown in Canada in relation to genotype and geographic location of production was surveyed for the commercial growing regions in Manitoba, Saskatchewan, Alberta and British Columbia. The average hard-seed content of all pedigreed production over a 5-yr period, ranged from 22 to 37% and that in nonpedigreed production was between 14 and 30%. A database of the five widely grown cultivars revealed that the hard-seed content of alfalfa in the most northerly growing areas in the Peace River region of Alberta and British Columbia ranged from 31 to 51%, while hard seed content of alfalfa produced elsewhere varied from 22 to 38%. There was no apparent effect of latitude on the proportion of hard seeds, while there was a small increase for two of the five cultivars in production areas further west. Of particular interest was the trend in viable seed production. There was consistent evidence suggesting that the proportion of viable seeds decreased in production areas further north, but increased in production areas further west. However, the minimum viability was always in excess of 85%. There was no correlation between hard and viable seed. Key words: Medicago spp., alfalfa, lucerne, hard seeds, viable seeds

scholarly journals Self fertility of pear varieties conditioned by natural self pollination (autogamy)

2000 ◽  
Vol 6 (1) ◽  
Author(s):  
J. Nyéki ◽  
M. Soltész ◽  
J. Iváncsics
Keyword(s):  
Fruit Set ◽  
Experimental Period ◽  
Gene Bank ◽  
Viable Seed ◽  
Ecological Conditions ◽  
Self Pollination ◽  
Seed Content ◽  
Viable Seeds ◽  
Number Of Seeds

Authors studied the autofertility depending on natural self pollination (autogamy) in 59 pear cultivars during 4 seasons at three locations with different ecological conditions (Helvetia, Kecskemet-Kisfai, Keszthely). The aim of the experiments was to determine the autogamous tendencies of varieties hitherto unexplored in the Hungarien gene bank, or to check data found in the literature. A total of 42616 isolated pear flowers produced 1.2% fruits with at least one viable seed in each. The 59 varieties observed did not set fruit by autogamy on either of the three sites during the four years of the study. The triploid (3n=51) varieties were entirely self-sterile. According to the highest autogamous fruit set, during the experimental period, the varieties have been assigned to four groups: (1) Entirely auto-incompatible (0% fruit set), (2) auto-incompatible (0.1 to 0.9%), slightly self fertile (1.1 to 5%) and (4) self fertile (5.1 to 10%). According to the number of viable seeds per fruit resulting from autogamy, the varieties are assigned to three groups as (1) low seed content (less than 3 seeds per fruit), medium (3.1 to 5) and (3) high (more than 5 seeds). Thus, the assessment of the number of seeds per fruit resulting from autogamy is indispensable as a proof of the absence of parthenocarpy.

scholarly journals Trade of commercial potting substrates: A largely overlooked means of the long-distance dispersal of plants

2021 ◽  
Author(s):  
Judit Sonkoly ◽  
Attila Takács ◽  
Attila Molnár V. ◽  
Péter Török
Keyword(s):  
Plant Species ◽  
Large Scale ◽  
Long Distance Dispersal ◽  
Viable Seed ◽  
Long Distance ◽  
Ecological Processes ◽  
Number Of Species ◽  
Seed Content ◽  
Wide Range ◽  
Viable Seeds

AbstractAlthough long-distance dispersal (LDD) events are considered to be rare and highly stochastic, they are disproportionately important and drive several large-scale ecological processes. The realisation of the disproportionate importance of LDD has led to an upsurge in studies of this phenomenon; yet, we still have a very limited understanding of its frequency, extent and consequences. Humanity intentionally spreads a high number of species, but a less obvious issue is that it is associated with the accidental dispersal of other plant species. Although the global trade of potted plants and horticultural substrates is capable of dispersing large quantities of propagules, this issue has hardly been studied from an ecological point of view. We used the seedling emergence method to assess the viable seed content of different types of commercial potting substrates to answer the following questions: (i) In what richness and density do substrates contain viable seeds? (ii) Does the composition of substrates influence their viable seed content? and (iii) Are there common characteristics of the species dispersed this way? We detected altogether 438 seedlings of 66 taxa and found that 1 litre of potting substrate contains an average of 13.27 seeds of 6.24 species, so an average 20-litre bag of substrate contains 265 viable seeds. There was a high variability in the seed content of the substrates, as substrates containing cattle manure contained a substantially higher number of species and seeds than substrates without manure. Based on this, this pathway of LDD is an interplay between endozoochory by grazing livestock and accidental human-vectored dispersal, implying that the diet preference of grazing animals largely determines the ability of a plant species to be dispersed this way. According to our results, potting substrates can disperse large quantities of seeds of a wide range of plant species, moreover, these dispersal events occur on very long distances in almost all cases. We conclude that this kind of human-vectored LDD may have complex effects on plant populations and communities; however, as this dispersal pathway is largely understudied and has hardly been considered as a type of LDD, its consequences are still largely unknown and further studies of the issue are of great importance.

Characterization of organic matter in a forest soil of coastal British Columbia by NMR and pyrolysis-field ionization mass spectrometry

1994 ◽  
Vol 158 (1) ◽  
pp. 69-82 ◽  
Author(s):  
C. M. Preston ◽  
R. Hempfling ◽  
H. -R. Schulten ◽  
M. Schnitzer ◽  
J. A. Trofymow ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
British Columbia ◽  
Organic Matter ◽  
Forest Soil ◽  
Ionization Mass Spectrometry ◽  
Field Ionization ◽  
Ionization Mass ◽  
Coastal British Columbia

Dynamic and seasonal fluctuations of microarthropod complex in coniferous forest soil

Ekologija ◽  
2008 ◽  
Vol 54 (4) ◽  
pp. 201-215 ◽  
Author(s):  
Irena Eitminavičiūtė ◽  
Audronė Matusevičiūtė ◽  
Algirdas Augustaitis
Keyword(s):  
Forest Soil ◽  
Coniferous Forest ◽  
Seasonal Fluctuations
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