The Occurrence of Schoenus Nigricans L. in Blanket Bogs: I. Environmental Conditions Affecting the Growth of S. Nigricans in Blanket Bog

1967 ◽  
Vol 55 (1) ◽  
pp. 1 ◽  
Author(s):  
J. H. Sparling
Keyword(s):  
Environmental Conditions ◽  
Blanket Bog ◽  
Schoenus Nigricans

I.B.P. studies on montane grassland and moorlands

1976 ◽  
Vol 274 (934) ◽  
pp. 295-314 ◽  
Keyword(s):  
Primary Productivity ◽  
Environmental Conditions ◽  
Ecosystem Functioning ◽  
Secondary Production ◽  
Dry Matter ◽  
Dwarf Shrub ◽  
South Georgia ◽  
Blanket Bog ◽  
Herbivore Consumption

The aim of the grassland and moorland studies was to measure primary and secondary production and to describe the main pathways of dry matter and nutrients within these ecosystems. The strategy was to make detailed studies on two main sites (Snowdonia and Moor House N.N.R. in the northern Pennines) with a limited number of supporting studies. The examination of the few sites in the U.K. must be seen as part of a series of sites within the International Grassland and Tundra Biomes. They are thus replicates and the series allows examination of trends in productivity related to environmental conditions. The Bi-Polar Botanical Project, with sites in Greenland and South Georgia, supported by the U.K., is part of the international series. The Snowdonia project covered a range of sites but concentrated on a sheep-grazed Agrostis-Festuca sward at 460 m. At Moor House attention focused on blanket bog sites dominated by Calluna, Eriophorum and Sphagnum at about 600 m with supporting studies on dwarf shrub communities ranging from 1100 m in the Cairngorm Mountains to 60 m in Dorset. Comparisons are made of three estimates of primary productivity, of herbivore consumption with production, and decomposer populations with process rates. These results are briefly reviewed in the context of the international range of sites; they allow us to distinguish broad patterns of ecosystem functioning.

Vibration Isolator System for Electron Microscope

1990 ◽  
Vol 48 (1) ◽  
pp. 182-183
Author(s):  
K. Ohi ◽  
M. Mizuno ◽  
T. Kasai ◽  
Y. Ohkura ◽  
K. Mizuno ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Magnetic Fields ◽  
Environmental Conditions ◽  
Vibration Isolator ◽  
Air Conditioners ◽  
Vibration Isolators ◽  
Large Size ◽  
Electron Microscopes

In recent years, with electron microscopes coming into wider use, their installation environments do not necessarily give their performance full play. Their environmental conditions include air-conditioners, magnetic fields, and vibrations. We report a jointly developed entirely new vibration isolator which is effective against the vibrations transmitted from the floor.Conventionally, large-sized vibration isolators which need the digging of a pit have been used. These vibration isolators, however, are large present problems of installation and maintenance because of their large-size.Thus, we intended to make a vibration isolator which1) eliminates the need for changing the installation room2) eliminates the need of maintenance and3) are compact in size and easily installable.

The influence of external conditions on sound pressure in the pistonphone at the infrasound frequency range

2020 ◽  
pp. 67-72
Author(s):  
A. V. Konkov ◽  
D. V. Golovin
Keyword(s):  
Environmental Conditions ◽  
Sound Pressure ◽  
Primary Method ◽  
Frequency Range ◽  
External Conditions ◽  
Numerical Estimations

The influence of environmental conditions on a sound pressure reproduced by the primary method in the measuring chambers of the Pistonphone in the frequency range from 1 mHz to 250 Hz is estimated. Numerical estimations of influence of environmental conditions on sound pressure in pistonphone measuring chambers are given and special requirements to system of maintenance of required external conditions are specified.

Disentangling the role of shared ancestry and the environment on leaf stable isotopes

2019 ◽  
Author(s):  
Marko J. Spasojevic ◽  
Sören Weber1
Keyword(s):  
Stable Isotopes ◽  
Environmental Conditions ◽  
Evolutionary History ◽  
Environmental Control ◽  
Phylogenetic Signal ◽  
Individual Species ◽  
Habitat Types ◽  
Δ13c And Δ15n ◽  
Environmental Controls ◽  
Shared Ancestry

Stable carbon (C) and nitrogen (N) isotopes in plants are important indicators of plant water use efficiency and N acquisition strategies. While often regarded as being under environmental control, there is growing evidence that evolutionary history may also shape variation in stable isotope ratios (δ13C and δ15N) among plant species. Here we examined patterns of foliar δ13C and δ15N in alpine tundra for 59 species in 20 plant families. To assess the importance of environmental controls and evolutionary history, we examined if average δ13C and δ15N predictably differed among habitat types, if individual species exhibited intraspecific trait variation (ITV) in δ13C and δ15N, and if there were a significant phylogenetic signal in δ13C and δ15N. We found that variation among habitat types in both δ13C and δ15N mirrored well-known patterns of water and nitrogen limitation. Conversely, we also found that 40% of species exhibited no ITV in δ13C and 35% of species exhibited no ITV in δ15N, suggesting that some species are under stronger evolutionary control. However, we only found a modest signal of phylogenetic conservatism in δ13C and no phylogenetic signal in δ15N suggesting that shared ancestry is a weaker driver of tundra wide variation in stable isotopes. Together, our results suggest that both evolutionary history and local environmental conditions play a role in determining variation in δ13C and δ15N and that considering both factors can help with interpreting isotope patterns in nature and with predicting which species may be able to respond to rapidly changing environmental conditions.

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