Neighbour interaction and stability in subalpine meadow communities

1996 ◽  
Vol 7 (1) ◽  
pp. 41-44 ◽  
Author(s):  
Z. Kikvidze
Keyword(s):  
Subalpine Meadow ◽  
Meadow Communities ◽  
Neighbour Interaction

Diesel oil spill in a subalpine meadow: 9 years of recovery

1982 ◽  
Vol 60 (6) ◽  
pp. 906-910 ◽  
Author(s):  
Joy Belsky
Keyword(s):  
Oil Spill ◽  
Plant Cover ◽  
Bare Soil ◽  
Diesel Oil ◽  
Community Recovery ◽  
Growing Seasons ◽  
Subalpine Meadow ◽  
Meadow Communities ◽  
Casual Observer

Two subalpine meadow communities near Mt. Baker, Washington, were inundated by a spill of 26 000 L of diesel oil in 1972. Studies were made of the initial impact of the oil on the vegetation and of community recovery over 9 years. Within two growing seasons following the spill, plant cover had decreased from a prespill cover of nearly 100% to 1% and all species except Phyllodoce empetriformis, Carex lenticularis, and Rhacomitrium sudeticum had died. Seedlings of Carex nigricans began to appear on bare soil after 1 year, followed by seedlings of other common subalpine species 2 to 4 years later. Nine years after the perturbation 5 to 20% of the ground was covered with vegetation and the original disturbance could no longer be discerned by a casual observer.

Competitive effects on the structure of subalpine meadow communities

1985 ◽  
Vol 63 (8) ◽  
pp. 1444-1452 ◽  
Author(s):  
Roger del Moral
Keyword(s):  
Community Structure ◽  
Dominant Species ◽  
Experimental Studies ◽  
Experimental Methods ◽  
Niche Width ◽  
Competitive Effects ◽  
Structure And Dynamics ◽  
Subalpine Meadow ◽  
Species Overlap ◽  
Meadow Communities

The effects of competition in a subalpine meadow environment were investigated by comparing within-habitat distributions and species overlap in four communities. Based on experimental studies of these communities, it was hypothesized that structural patterns should be affected by productivity changes. It was determined that such changes are nonlinear and that the most stressed and the most competitive communities share many similar properties. Among closed, relatively productive communities, mean niche width, niche width of competitively inferior species, total overlap, and overlap among weak competitors all declined with increased competitive intensity. In contrast, niche width of dominant species changed little and overlap among space-holding species increased. The use of comparative pattern measures can complement and enhance the analysis of community structure and dynamics based on experimental methods.

Plant Traits Response to Grazing Exclusion by Fencing Assessed via Multiple Classification Approach: A Case from a Subalpine Meadow

2019 ◽  
Vol 67 (1) ◽  
pp. 33 ◽  
Author(s):  
Wen Jin Li ◽  
Shuang Shuang Liu ◽  
Jin Hua Li ◽  
Ru Lan Zhang ◽  
Ka Zhuo Cai Rang ◽  
...  
Keyword(s):  
Plant Traits ◽  
Classification Approach ◽  
Grazing Exclusion ◽  
Subalpine Meadow ◽  
Multiple Classification

scholarly journals Grazing alters species relative abundance by affecting plant functional traits in a Tibetan subalpine meadow

2021 ◽  
Author(s):  
Qifang He ◽  
Kai Jiang ◽  
Weicheng Hou ◽  
Yang Zhao ◽  
Xinhang Sun ◽  
...  
Keyword(s):  
Functional Traits ◽  
Relative Abundance ◽  
Plant Functional Traits ◽  
Subalpine Meadow

scholarly journals Undecidability in quantum thermalization

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Naoto Shiraishi ◽  
Keiji Matsumoto
Keyword(s):  
Turing Machine ◽  
Thermal Equilibrium ◽  
General Theorem ◽  
Nearest Neighbour ◽  
Many Body ◽  
Initial State ◽  
One Dimensional ◽  
Universal Turing Machine ◽  
Many Body Systems ◽  
Neighbour Interaction

AbstractThe investigation of thermalization in isolated quantum many-body systems has a long history, dating back to the time of developing statistical mechanics. Most quantum many-body systems in nature are considered to thermalize, while some never achieve thermal equilibrium. The central problem is to clarify whether a given system thermalizes, which has been addressed previously, but not resolved. Here, we show that this problem is undecidable. The resulting undecidability even applies when the system is restricted to one-dimensional shift-invariant systems with nearest-neighbour interaction, and the initial state is a fixed product state. We construct a family of Hamiltonians encoding dynamics of a reversible universal Turing machine, where the fate of a relaxation process changes considerably depending on whether the Turing machine halts. Our result indicates that there is no general theorem, algorithm, or systematic procedure determining the presence or absence of thermalization in any given Hamiltonian.

Specific heat of ordered and isotopically disordered lattices

1978 ◽  
Vol 56 (10) ◽  
pp. 1390-1394
Author(s):  
K. P. Srivastava
Keyword(s):  
Specific Heat ◽  
Low Temperatures ◽  
Numerical Study ◽  
Three Dimensional ◽  
Constant Volume ◽  
Nearest Neighbour ◽  
Two Dimensional ◽  
Appreciable Difference ◽  
Substantial Change ◽  
Neighbour Interaction

An extensive numerical study on specific heat at constant volume (Cv) for ordered and isotopically disordered lattices has been made. Cv at various temperatures for ordered and disordered linear and two-dimensional lattices have been compared and no appreciable difference in Cv between these two structures has been observed. Effect of concentration of light atoms on Cv for three-dimensional isotopically disordered lattices has also been shown.In spite of taking next-nearest-neighbour interaction into account, no substantial change in Cv between the ordered and isotopically disordered linear lattices has been found. It is shown that the low lying modes contribute substantially at low temperatures.

Postfledging Dispersal of Green-Tailed Towhees to a Subalpine Meadow

The Condor ◽  
1991 ◽  
Vol 93 (2) ◽  
pp. 466-468 ◽  
Author(s):  
Martin L. Morton
Keyword(s):  
Subalpine Meadow
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