Revegetation of earthen mounds along a topographic-productivity gradient in a northern mixed prairie

1995 ◽  
Vol 6 (5) ◽  
pp. 637-646 ◽  
Author(s):  
Charles E. Umbanhowar
Keyword(s):  
Productivity Gradient ◽  
Mixed Prairie

Fourteen years of mapped, permanent quadrats in a northern mixed prairie, USA

Ecology ◽  
2011 ◽  
Vol 92 (8) ◽  
pp. 1703-1703 ◽  
Author(s):  
Jed Anderson ◽  
Lance Vermeire ◽  
Peter B. Adler
Keyword(s):  
Mixed Prairie ◽  
Permanent Quadrats

Effects of land-use changes on plant functional and taxonomic diversity along a productivity gradient in wet meadows

2013 ◽  
Vol 24 (5) ◽  
pp. 898-909 ◽  
Author(s):  
Š. Janeček ◽  
F. de Bello ◽  
J. Horník ◽  
M. Bartoš ◽  
T. Černý ◽  
...  
Keyword(s):  
Land Use ◽  
Land Use Changes ◽  
Taxonomic Diversity ◽  
Wet Meadows ◽  
Productivity Gradient ◽  
Effects Of Land Use

PERSISTENCE OF CHANGES IN SELECTED SOIL CHEMICAL AND PHYSICAL PROPERTIES AFTER PIPELINE INSTALLATION IN SOLONETZIC NATIVE RANGELAND

1987 ◽  
Vol 67 (4) ◽  
pp. 747-763 ◽  
Author(s):  
M. A. NAETH ◽  
A. W. BAILEY ◽  
W. B. McGILL
Keyword(s):  
Organic Matter ◽  
Physical Properties ◽  
Bulk Density ◽  
Organic Matter Content ◽  
Matter Content ◽  
Chemical Changes ◽  
Ecosystem Responses ◽  
Native Prairie ◽  
Natural Gas Pipelines ◽  
Mixed Prairie

A study was conducted in Solonetzic mixed prairie of southern Alberta to evaluate and determine the longevity of selected ecosystem responses to pipeline installation. Five adjacent natural gas pipelines on a series of rights-of-way (ROW) were studied at three sites. The lines, which were installed in 1957, 1963, 1968, 1972 and 1981, had diameters of 86, 86, 91, 107 and 107 cm, respectively. Soils were analyzed for particle size distribution, bulk density, pH, electrical conductivity, ion composition, and organic matter content. It was concluded that pipeline construction in Solonetzic mixed prairie range-land initially tended to improve surface soil chemical and physical properties compared to blowouts, but reduced soil quality in vegetated native prairie. Surface bulk density increased to 1.3–1.6 Mg m−3 from an undisturbed density of 0.9–1.0 Mg m−3. Increased densities were evident to 55 cm in all 1981 transects except the trench where subsurface densities were reduced. Chemical changes were associated with reduced organic matter and increased salts at the surface. On the basis of differences between the various ages of pipelines (1981, youngest; 1957, oldest) there was evidence for greater amelioration of chemical changes than of physical disturbances over time. The time needed to restore half the lost organic matter was estimated to be approximately 50 y. Key words: Pipeline, Solonetzic soil, rangeland (native), soil chemistry, bulk density, reclamation

Ecology of the Leaf-cutter Bee Megachile perihirta Ckll. (Hymenoptera: Megachilidae) in Relation to Production of Alfalfa Seed

1956 ◽  
Vol 88 (11) ◽  
pp. 625-631 ◽  
Author(s):  
G. A. Hobbs
Keyword(s):  
Flight Period ◽  
Relative Importance ◽  
Southern Alberta ◽  
Alfalfa Seed ◽  
Nesting Habits ◽  
Mixed Prairie ◽  
Ground Nesting ◽  
Distribution Frequency

The relative importance as pollinators of alfalfa of each of the 14 species of Megachile that occur in southern Alberta has been assessed on the basis of Alberta distribution, frequency and abundance in mixed prairie, nesting habits, pollen preferences, and flight period; two ground-nesting species of the subgenus Xanthosarus Rob., Megachile perihirta Ckll. and M. dentitarsus Slad., were judged the principal pollinators (Hobbs and Lilly, 1954).

scholarly journals Ant Abundance along a Productivity Gradient: Addressing Two Conflicting Hypotheses

PLoS ONE ◽  
2015 ◽  
Vol 10 (7) ◽  
pp. e0131314 ◽  
Author(s):  
Udi Segev ◽  
Jaime Kigel ◽  
Yael Lubin ◽  
Katja Tielbörger
Keyword(s):  
Productivity Gradient
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