Natural Recovery of Rough Fescue (Festuca hallii(Vasey) Piper) Grassland After Disturbance by Pipeline Construction in Central Alberta, Canada

2013 ◽  
Vol 33 (1) ◽  
pp. 91-98 ◽  
Author(s):  
Peggy A. Desserud ◽  
M. Anne Naeth
Keyword(s):  
Natural Recovery ◽  
Pipeline Construction ◽  
Festuca Hallii ◽  
Rough Fescue

Above-ground net primary production of plains rough fescue [Festuca hallii (Vasey) Piper] after a single defoliation on five landform elements

2011 ◽  
Vol 91 (4) ◽  
pp. 689-696 ◽  
Author(s):  
A. Pantel ◽  
J. T. Romo ◽  
Y. Bai
Keyword(s):  
Primary Production ◽  
Net Primary Production ◽  
First Year ◽  
Production Potential ◽  
Festuca Hallii ◽  
Second Year ◽  
Mixed Prairie ◽  
Rough Fescue

Pantel, A., Romo, J. T. and Bai, Y. 2011. Above-ground net primary production of plains rough fescue [ Festuca hallii (Vasey) Piper] after a single defoliation on five landform elements. Can. J. Plant Sci. 91: 689–696. Above-ground net primary production (ANPP) was determined for plains rough fescue [Festuca hallii (Vasey) Piper] following a single defoliation to 7.5 cm stubble height on five landform elements in the Northern Mixed Prairie. The landform elements included north aspect-concave slopes, north aspect-convex slopes, south aspect-concave slopes, south aspect-convex slopes, and level uplands. Above-ground net primary production was determined for 2 yr after defoliating plants in May through November. Above-ground net primary production after defoliation was not dependent on landform elements in the first (P=0.23) and second years (P=0.22) after defoliation. In the first year after June through September defoliation, ANPP was reduced 29 to 41% (P <0.01), whereas May, October, or November defoliation had no significant effect on ANPP. Above-ground net primary production did not vary significantly (P=0.61) among months of defoliation in the second year after defoliation. Less ANPP in the first year after June through September defoliation indicates the need for ≥1 yr of deferred use to allow plants to regain their production potential. Unaffected ANPP after May, October, or November defoliation suggests plains rough fescue can be grazed annually. Recuperation of ANPP after defoliation depends on the month of the year in which plains rough fescue is defoliated, but not on landform elements in the Northern Mixed Prairie.

Growth response of Festuca altaica, Festuca hallii, and Festuca campestris to temperature

1995 ◽  
Vol 73 (7) ◽  
pp. 1074-1080 ◽  
Author(s):  
Jane R. King ◽  
Michael J. Hill ◽  
Walter D. Willms
Keyword(s):  
Dry Matter ◽  
Growth Response ◽  
Extension Rate ◽  
Dry Matter Accumulation ◽  
Ecological Significance ◽  
Shoot Ratio ◽  
Temperature Regimes ◽  
Festuca Hallii ◽  
Rough Fescue ◽  
Leaf Extension

In Alberta, the rough fescue complex consists of Festuca altaica Trin., Festuca hallii (Vasey) Piper, and Festuca campestris Rydb. The potential commercial value of these species for grazing, and their ecological significance, necessitates an increased understanding of their environmental adaptation. This study compared the growth response of the three species at five temperature regimes of 7:3, 12:8, 17:13, 22:18, and 27:23 °C (light:dark; 18-h photoperiod). Seedlings were established and grew for 10 weeks at 18 °C before being trimmed to a height of 3.5 cm and randomly assigned (36 pots of each species) to the growing environments. Growth was followed for 12 weeks. Temperature had a significant effect on most plant variables but the response differed among species. The optimal temperature for dry matter accumulation was 17:13 °C, and for tillering 12:8 to 17:13 °C. Festuca hallii and F. campestris exhibited a faster tillering rate than F. altaica, which had the heaviest tillers and highest leaf extension rate. The root to shoot ratio declined at temperatures above 17:13 °C. The significance of these observations to the geographical distribution of the species is discussed. Key words: rough fescue, defoliation, yield, growth analysis, adaptation.

Patterns of amplified restriction fragment polymorphism in natural populations and corresponding seed collections of plains rough fescue (Festuca hallii)

2007 ◽  
Vol 85 (5) ◽  
pp. 484-492 ◽  
Author(s):  
Jie Qiu ◽  
Yong-Bi Fu ◽  
Yuguang Bai ◽  
John F. Wilmshurst
Keyword(s):  
Genetic Diversity ◽  
Restriction Fragment ◽  
Natural Populations ◽  
Population Variation ◽  
Ex Situ ◽  
Grass Species ◽  
Restriction Fragment Polymorphism ◽  
Festuca Hallii ◽  
Rough Fescue ◽  
Seed Collections

Plains rough fescue ( Festuca hallii (Vasey) Piper) is a dominant native grass species in the Fescue Prairie region of North America that has undergone dramatic range reduction in the past century. Little is known about the genetic diversity of this species. The amplified restriction fragment polymorphism (AFLP) technique was applied to assess the comparative genetic diversity of six plains rough fescue populations in Manitoba and Saskatchewan and their corresponding seed collections. Three AFLP primer pairs were employed to screen 529 samples, representing about 30 samples each of reproductive tiller, vegetative tiller, and seed collected from each population. A total of 330 polymorphic AFLP bands were scored for each sample; their occurrence frequencies ranged from 0.01 to 0.99 and averaged around 0.47. Analysis of molecular variance revealed more than 90% of the total AFLP variation resided within natural populations (reproductive and vegetative tillers) and within seed samples. Four populations sampled from protected areas appear to have relatively lower within-population variation than two unprotected populations. Only 0.2% AFLP difference was revealed among the three tissue types examined. The tiller samples revealed slightly larger among-population variation than the seed samples and captured substantial associations of AFLP variation with population geographic distances. These findings are important for germplasm sampling for ex situ conservation, are useful for germplasm development for pasture seeding, and should facilitate the management of fragmented fescue populations.

Method of pipeline construction in swamplands with use of refrigeration circuit

2019 ◽  
pp. 75-87
Author(s):  
S.I. Sentsov ◽  
◽  
V.A. Ivanov ◽  
I.G. Silina ◽  
E.A. Gilmiyarov ◽  
...  
Keyword(s):  
Pipeline Construction
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