Estimation of Leaf and Stem Growth of Unbranched Senecio keniodendron Trees

Beck, Erwin; Scheibe, Renate; Senser, Margot; Müller, W. J.

doi:10.1016/s0367-2530(17)31191-x

Cited by 22 publications

(11 citation statements)

References 5 publications

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“…Hedberg, 1964;Miller, 1986). Meinzer and Goldstein (1985) suggested that only large plant organs with a high heat capacity could show considerable delay in cooling, such as that found in the bracts of Lobelia keniensis (Beck et al, 1980;Evans, 1996). Azorella compacta, a giant cushion plant in the southern Andes has a thin leaf layer directly overtopping massive woody structures that are able to store heat (Kleier, 2001).…”

Section: Discussionmentioning

confidence: 99%

The Bracts of Saussurea velutina (Asteraceae) Protect Inflorescences from Fluctuating Weather at High Elevations of the Hengduan Mountains, Southwestern China

Yang

2009

Arctic, Antarctic, and Alpine Research

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Section: Discussionmentioning

confidence: 99%

The Bracts of Saussurea velutina (Asteraceae) Protect Inflorescences from Fluctuating Weather at High Elevations of the Hengduan Mountains, Southwestern China

Yang

2009

Arctic, Antarctic, and Alpine Research

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“…In some Afro-alpine giant rosette species, pubescence contributes to the insulative effect of nighttime closure of rosettes and thus exerts a protective function (Hedberg, 1964;Miller, 1986). Meinzer and Goldstein (1985) suggested that only massive plant organs with a high heat capacity could show considerable delay in cooling, such as that found in rosettes of Lobelia keniensis (Beck et al, 1980). Azorella compacta, a giant cushion plant in the southern Andes has a thin leaf layer directly overtopping massive woody structures which are able to store heat (Kleier, 2001).…”

Section: Discussionmentioning

confidence: 99%

“…Well-known examples of high pubescence are the tropical giant rosettes above tree line in Africa and the equatorial Andes. These exceptional plants have been shown to benefit in various ways from a covering of dead trichomes, often much thicker than the actual leaf (Kö rner, 2003;Beck et al, 1980). A number of alpine taxa produce smaller, but still upright growth forms which emerge from otherwise narrow, low stature vegetation carpets dominating the highest elevations.…”

Section: Introductionmentioning

confidence: 99%

The Ecological Significance of Pubescence in Saussurea Medusa, a High-Elevation Himalayan “Woolly Plant”

Yang

Körner

2008

Arctic, Antarctic, and Alpine Research

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Several members of the vascular plant genus Saussurea, which are found at elevations exceeding 5000 m, have dense layers of woolly trichomes on their leaves, bracts, and inflorescences, the function of which is not fully understood. Here we explore the thermal benefits of pubescence in Saussurea medusa, both in situ in the Chinese Hengduan Mountains and under controlled conditions. Mean daytime inflorescence temperature was 5.9 K above air temperature. Pubescence removal revealed that most of this warming is not related to pubescence but to radiant warming of the compact inflorescence itself (4.1 K warming in shaved plants, i.e. 1.8 K less). The effect of pubescence on nighttime radiative cooling was negligible. Our data indicated that the functional role of pubescence in these high-elevation plants cannot be attributed solely to producing warming tissues, but may also include other functions such as water repellency and reflection of short peaks of high radiation. These other functions must be specific to a small group of species, given that most other high elevation taxa do not exhibit this woolly character.

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“…Low growth rates have been reported for other tropical alpine species. For example, the African giant rosette species Senecio keniodendron had an estimated height growth rate of 30 mm year -1 (Beck et al 1980).…”

Section: Discussionmentioning

confidence: 99%

Microsite requirements, population structure and growth of the cushion plant Azorella compacta in the tropical Chilean Andes

Kleier

Rundel²

2004

Austral Ecology

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In the altiplano of northern Chile, we investigated the microsite habitats, adult population structure and growth rates over 14 months for the giant cushion plant Azorella compacta . The majority of plants (52.0%) were found growing downslope of large (>50 cm diameter) boulders and on north-facing rocky slopes with a slope angle greater than 10 Њ inclination (44.4%). Size was used as a surrogate for age. The youngest size class was most common; remaining size classes were roughly equal in frequency; but very large cushions were scarce. Growth rates were expressed as height, diameter and perimeter over a 14-month period. Height increased an average of 1.40 cm, perimeter increased an average of 10.28 cm and diameters actually decreased 2.30 cm, although this was not a significant difference. Using perimeter averages based on mean plant size, we estimated a radial growth rate of 1.70 cm per 14 months. Trenches 4 cm wide were cut over the length of five plants, and these trenches were nearly repaired after 1 year, indicating that growth is overall and not just on the perimeter of the plant. These findings indicate that although Azorella compacta populations may be recovering from past exploitation, future monitoring is still necessary to ensure viable populations.

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Estimation of Leaf and Stem Growth of Unbranched Senecio keniodendron Trees

Cited by 22 publications

References 5 publications

The Bracts of Saussurea velutina (Asteraceae) Protect Inflorescences from Fluctuating Weather at High Elevations of the Hengduan Mountains, Southwestern China

The Bracts of Saussurea velutina (Asteraceae) Protect Inflorescences from Fluctuating Weather at High Elevations of the Hengduan Mountains, Southwestern China

The Ecological Significance of Pubescence in Saussurea Medusa, a High-Elevation Himalayan “Woolly Plant”

Microsite requirements, population structure and growth of the cushion plant Azorella compacta in the tropical Chilean Andes

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