Early-20th Century Environmental Changes Inferred Using Subfossil Diatoms from a Small Pond on Melville Island, N.W.T., Canadian High Arctic

Hydrobiologia ◽  
2006 ◽  
Vol 553 (1) ◽  
pp. 15-26 ◽  
Author(s):  
Bronwyn E. Keatley ◽  
Marianne S.V. Douglas ◽  
John P. Smol
Author(s):  
Ruslan M. Zhitin ◽  
Aleksey G. Topilsky

The features of forestry of the landowners of the Tambov Governorate at the turn of the 19th and 20th centuries are analyzed. The key factors of natural (forest cover of the area), economic (first of all, the construction of railways, changes in demand for timber) and social (the need to protect plantations from the surrounding peasant population) character that influenced forestry are shown. The main ways of development are indicated, due to both economic opportunities and the desire (or unwillingness) of landowners to equip their forest lands. The methods of forestry in the northern, central and southern districts of the Tambov Governorate are analyzed, the different degree of forest cover of which was reflected in the value of forest materials for local residents. Methods of combining forestry with other types of management, in particular, grazing, which were practiced mainly in the northern districts of the Tambov Governorate, where there was an excess of forest resources, are described. The reasons for the clear-cutting of forests practiced by a number of owners, which led to serious environmental changes, are indicated. The characteristics of various types of rational nature management in forestry are given on the materials of individual estates, to which more and more landowners have turned. We describe the reasons for the development of a thrifty attitude to forest resources.


2021 ◽  
pp. 1-16
Author(s):  
Gautier Davesne ◽  
Florent Domine ◽  
Daniel Fortier

Abstract In polar deserts, depth hoar (hereinafter: DH) growth is not systematic unlike on tundra and this is critical for snowpack properties. Here, we address the spatio-temporal variability of the DH layer in the polar desert at two sites in the Canadian High Arctic: Ward Hunt Island (83° N) and Resolute Bay (75° N). Our data show that, over humid areas, DH represented a larger fraction of the snowpack and was characterized by lower density and coarser crystals than over dry gravelly areas. Increased soil moisture extends the zero-curtain period during freeze-up, leading to stronger temperature gradients in the snowpack and greater kinetic metamorphism. Our results also demonstrate that the large inter-annual variability in DH is primarily driven by wind conditions in the fall since this key variable controls the initial snow density and snow onset date. These strong controls exerted by soil moisture and meteorological conditions on DH growth in polar deserts highlight the possibility of major changes in polar snowpacks physical properties in response to the rapid climate and environmental changes currently affecting these regions.


2003 ◽  
Vol 29 (2) ◽  
pp. 297-318 ◽  
Author(s):  
Becky Sjare ◽  
Ian Stirling ◽  
Cheryl Spencer

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