Survival of Seedlings of An Alpine Clover (Trifolium Nanum Torr.)

Bonde, Erik K.

doi:10.2307/1934513

Cited by 32 publications

(20 citation statements)

References 3 publications

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“…Wager, 1938;Bonde, 1968;Newell, 1982;Maruta, 1983;Jolls & Bock, 1983). A similar mechanism has also been discussed by Dahl (1951) in connection with the high winter mortality among certain species of vascular plants when cultivated in the lowlands.…”

Section: Demographic Trends and Seedling Establishmentmentioning

confidence: 57%

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Demography of Betula pubescens ssp. tortuosa sown in contrasting habitats close to the birch tree-limit in Central Sweden

Kullman

1986

Vegetatio

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Seeds of mountain birch (Betula pubescens Ehrh. ssp. tortuosa (Ledeb.) Nyman) were sown on permanent plots in three contrasting habitats close to the birch tree-limit in Central Sweden. The habitats differed mainly in regard to the length of the growth period, as determined by the pattern of local snow-accumulation. Germination success, seedling demography (1981)(1982)(1983) and related aspects of the early stages were studied. Germination was found to start shortly after snowmelt in the year after ripening, in all three habitats. The conclusion is that germination is not the crucial phase of the life-cycle. In the habitat with the longest growth period, and where spontaneous birch stands are present, mortality mainly occurred in summer, evidently caused by soil drought. With shortening of the growth period, however, mortality during the winter became increasingly important. Survival was clearly correlated with the length of the growth period and the autumn height of seedlings. Factors which affect ecesis determine the altitude of the tree-limit and the long-term stability of the mountain birch forest ecosystem.

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Section: Demographic Trends and Seedling Establishmentmentioning

confidence: 57%

“…Ostbye, 1975;Wielgolaski & Kfirenlampi, 1975). In numerous previous studies, summer drought has been concluded to be the chief obstacle to ecesis for various plant species living in boreal, arctic and alpine environments (Brink, 1964;Bonde, 1968;Bliss & Bell, 1980;McGraw & Shaver, 1982).…”

Section: Demographic Trends and Seedling Establishmentmentioning

confidence: 99%

Demography of Betula pubescens ssp. tortuosa sown in contrasting habitats close to the birch tree-limit in Central Sweden

Kullman

1986

Vegetatio

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“…Environmental conditions in some alpine habitats are stressful for germination and seedling establishment of plants because of the short time available without snowcover (Bonde 1968). In alpine ecosystems, seedling establishment occurs either from seeds in the seed bank or seed rain (Chambers 1995) and has been observed to be strongly dependent on the dispersal mode and the successional stage of available sites (Stöcklin and Bäumler 1996;Niederfriniger-Schlag and Erschbamer 2000).…”

Section: Introductionmentioning

confidence: 99%

Dispersal and microsite limitation of a rare alpine plant

Frei

Stöcklin

2011

Plant Ecol

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Knowledge on the limitation of plant species' distributions is important for preserving alpine biodiversity, particularly when the loss of alpine habitats because of global warming or land use changes is faster than colonization of new habitats. We investigated the potential of the rare alpine plant Campanula thyrsoides L. to colonize grassland sites of different suitability on a small mountain plateau in the Swiss Alps. A total of 15 experimental sites were selected according to their differences in habitat suitability for adult C. thyrsoides, which was measured by the Beals index. At each site we applied a disturbance treatment, added seeds at different densities and monitored the survival of seedlings over two consecutive years. The number of surviving seedlings was not positively related to habitat suitability for adult C. thyrsoides. Furthermore, C. thyrsoides appears to be strongly dispersal limited at the regional scale because seed addition to unoccupied habitats resulted in successful germination and survival of seedlings. Since an increase of seed density in already occupied sites did not affect the number of seedlings, we suggest that C. thyrsoides is microsite limited at the local scale. Microsite limitation is supported by the result that seedling survival of the species was enhanced in vegetation gaps created by disturbance. We conclude that C. thyrsoides may become endangered in the future if environmental changes cause local extinction of populations. An appropriate management, such as a disturbance regime for enhancing recruitment in existing populations, may ensure the long-term survival of this rare alpine plant species.

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“…Observations also revealed that survival percentage improved with the addition of manure and litter at both sites. Addition of litter and manure increased moisture-retaining capacity of soil and protect plants from drought, a key mortality factor (Bonde, 1968;Bell and Bliss, 1980). Cultural practices may further improved survival (Manjkhola and Dhar, 2002).…”

Section: Discussionmentioning

confidence: 99%

Cultivation of <i>Angelica archangelica</i> Linn.: evaluation for economical viability at two different climatic conditions

Vashistha¹,

Nautiyal²,

Nautiyal³

2009

International Journal of Biological and Chemical Sciences

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Cultivation of an important sub alpine-alpine medicinal and aromatic herb, Angelica archangelica Linn. (Apiaceae), was carried out at two different climatic zone at 2200 m asl (Pothivasa, PV) and 3600 m asl (Tungnath, TN) altitudes in Garhwal, North west Himalaya, India. These altitudes represent temperate and alpine region of the Himalaya. Since the species has a very few wild populations, cultivation of the species is recommended for its medicinal use. After the establishment of sufficient quantity of seedlings, they were transplanted in both sites at the age of two, three and four months for the comparative accounts on survival, growth and yield and, to test the appropriate age of seedlings for transplantation and climatic suitability for cultivation of the species. Organic cultivation protocol was adopted by using different farm yard manure (FYM) as treatments. Yield was minimum in youngest seedlings (two months old ) transplanted at TN in ordinary alpine soil (control) and maximum under polyhouse beds at PV after three years of growth. Observations on yield at different climatic zone revealed that it was maximum in PV (temperate site) as compared to alpine site (natural site) in all treatments. Seedlings of different age also had better survival, growth and yield at the temperate site though; two months old seedlings after transplantation had comparatively slow growth and yield than those of three and four months seedlings. These observations clearly suggested that temperate region (2200 m) is suitable for cultivation of A. archangelica. Addition of manure (leaf litter in particular) and polyhouse cultivation further improved the yield. Economical viability of the cultivation was also observed and presented here.

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Survival of Seedlings of An Alpine Clover (Trifolium Nanum Torr.)

Abstract: Survival percentages of Trifolium nanum seedlings in Colorado at 3,932 m altitude were 82.1, 55.8, and 27.5, respectively, at the end of the first, second, and third summers. Data on seedling substrates and growth are also presented.

Cited by 32 publications

References 3 publications

Demography of Betula pubescens ssp. tortuosa sown in contrasting habitats close to the birch tree-limit in Central Sweden

Demography of Betula pubescens ssp. tortuosa sown in contrasting habitats close to the birch tree-limit in Central Sweden

Dispersal and microsite limitation of a rare alpine plant

Cultivation of <i>Angelica archangelica</i> Linn.: evaluation for economical viability at two different climatic conditions

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