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  • 1
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    Wood production and latewood percentage of Douglas-fir from different stands and vitality classes (1993)
    Canadian Science Publishing
    Details
    Publication Date: 1993-07-01
    Description: Trunk wood production and amount of latewood of 171 Douglas-firs (Pseudotsugamenziesii (Mirb.) Franco) belonging to different vitality classes are analysed. The trees originated from 10 stands in the Netherlands varying in age from 25 to 70 years. Wood production is expressed as radial and volume increment over the last 15 years before sampling. The trees of 25–35 years old showed a better average vitality (less needle loss) than the older trees, and had a higher radial increment. Percentage of needle loss at the time of sampling was significantly and negatively correlated with radial and volume increment. The average latewood percentage over the last 15 years was the lowest in non vital trees. In non vital trees the wood-biomass production over the last 15 years was only ~30% of that in more vital trees. For the Netherlands as a whole the radial and volume increment in the last 15 years are estimated to be ~20% and ~4% lower, respectively, than they hypothetically would have been if all Douglas-firs belonged to the vitality classes 0 and 1. Total biomass production by Douglas-fir stands in the Netherlands is not greatly reduced by the small decrease in density in nonvital trees and is approximately 4% lower than if all trees were vital or slightly less vital.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 2
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    A revision of the genus Indigofera (Legumemosae-Papilionoideae) in Southeast Asia (1984)
    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (0006-5196) vol.30 (1984) nr.1 p.89
    Details
    Publication Date: 2015-03-06
    Description: In Southeast Asia (excluding India) 44 taxa are recognized, 39 species, of which four are newly described ( I. kerrii, I. luzoniensis, I. emmae, and one unnamed species A, which will be treated by Nguyen Van Thuan, Paris), four subspecies, one of which is new (I. sootepensis subsp. acutifolia) and three are new combinations ( (I. suffruticosa subsp. guatemalensis, I. trifoliata subsp. unifoliata, I. trita subsp. scabra) ), and one variety which is a new combination I. spicata var. siamensis). A key, descriptions and full synonymy are given as well as 4 distribution maps and 5 figures.
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
    Format: application/pdf
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  • 3
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    A revision of the genus Indigofera (Legumemosae-Papilionoideae) in Southeast Asia (1984)
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 30 no. 1, pp. 89-151
    Details
    Publication Date: 2024-01-12
    Description: In Southeast Asia (excluding India) 44 taxa are recognized, 39 species, of which four are newly described ( I. kerrii, I. luzoniensis, I. emmae, and one unnamed species A, which will be treated by Nguyen Van Thuan, Paris), four subspecies, one of which is new (I. sootepensis subsp. acutifolia) and three are new combinations ( (I. suffruticosa subsp. guatemalensis, I. trifoliata subsp. unifoliata, I. trita subsp. scabra) ), and one variety which is a new combination I. spicata var. siamensis). A key, descriptions and full synonymy are given as well as 4 distribution maps and 5 figures.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 4
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    Over het onderscheid tussen x Festulolium loliaceum (Huds.) P. Fourn. en zijn ouders en tussen x Festulolium-hybriden onderling (1980)
    In:  Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland vol. 10 no. 2/3, pp. 25-29
    Details
    Publication Date: 2024-01-12
    Description: The difference between x Festulolium loliaceum (Huds.) P. Fourn. and Festuca pratensis L. has been investigated by the author, x Festulolium loliaceum differs from Festuca pratensis in: 1. spikelets in the upper part of the inflorescence (-branches) sessile; 2. glumes markedly unequal (difference 1-4 mm) whereas in F. pratensis the glumes differ to up to 1 mm; 3. upper glumes 5-8 mm (in F. pratensis 4-5 mm). The author disagrees with the opinion that x Festulolium loliaceum and x F. holmbergii should never have awned lemmas. Only if the awns of the lemmas are larger than c. 1,5 mm does it seem acceptable to identify a specimen as Festuca pratensis x Lolium multiflorum (only 2 collections thusfar in the Netherlands) or, when the plant has hairy auricles, as Festuca arundinacea x Lolium multiflorum. The identification of x Festulolium collections with short-awned lemmas is uncertain.\nLastly the author mentions the fact that x Festulolium loliaceum always occurs in the neighbourhood of its parents. For that reason x F. loliaceum can not belong to the Netherlands flora, as only hybrids occurring in absence of the parents are accepted in the Standard List of the Netherlands Flora.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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