scholarly journals Retrospective growth analysis of the dwarf shrub Cassiope tetragona allows local estimation of vascular plant productivity in high arctic Svalbard

2018 ◽  
Vol 29 (5) ◽  
pp. 943-951 ◽  
Author(s):  
Jos M. Milner ◽  
Audun Stien ◽  
René Wal
Keyword(s):  
Growth Analysis ◽  
Vascular Plant ◽  
Plant Productivity ◽  
High Arctic ◽  
Dwarf Shrub ◽  
Local Estimation ◽  
Cassiope Tetragona

scholarly journals Holocene stratigraphy and vegetation history in the Scoresby Sund area, East Greenland

1978 ◽  
Vol 129 ◽  
pp. 1-66
Author(s):  
S Funder
Keyword(s):  
Vegetation History ◽  
High Arctic ◽  
Dwarf Shrub ◽  
Betula Nana ◽  
Isostatic Uplift ◽  
Cassiope Tetragona ◽  
Pollen Diagrams ◽  
Salix Arctica ◽  
Low Arctic ◽  
Holocene Stratigraphy

The Holocene stratigraphy in Scoresby Sund is based on climatic change as reflected by fluctuations in fjord and valley glaciers, immigration and extinction of marine molluscs, and the vegetation history recorded in pollen diagrams from five lakes. The histories are dated by C-14, and indirectly by emergence curves showing the patterns of isostatic uplift. From c. 10100-10400 to 9400 yr BP the major fjord glaciers showed oscillatory retreat with abundant moraine formation, the period of the Milne Land Moraines. The vegetation in the ice-free areas was a sparse type of fell field vegetation but with thermophilous elements indicating temperatures similar to the present. From 9400 yr BP the fjord glaciers retreated rapidly in the narrow fjords, the few moraines formed are referred to the Rødefjord stages and indicate topographically conditioned stillstands. At 8000 yr BP the low arctic Betula nana immigrated into the area, and in the period until 5000 yr BP dense dwarf shrub heath grew in areas where it is now absent. In the fjords the subarctic Mytilus edulis and Pecten islandica lived, suggesting a climate warmer than the present. From c. 5000 yr BP the dense dwarf shrub heath began to disappear in the coastal areas, and a 'poor' heath dominated by the high arctic Salix Arctica and Cassiope tetragona expanded. These two species, which are now extremely common, apparently did not grow in the area until c. 6000 yr BP. In lakes in the coastal area minerogenic sedimentation at c. 2800 yr BP, reflecting the general climatic deterioration.

Phenology and resource allocation in a high arctic evergreen dwarf shrub, Cassiope tetragona

Ecography ◽  
1987 ◽  
Vol 10 (2) ◽  
pp. 128-136 ◽  
Author(s):  
M. L. N. Nams ◽  
B. Freedman
Keyword(s):  
Resource Allocation ◽  
High Arctic ◽  
Dwarf Shrub ◽  
Cassiope Tetragona

scholarly journals Deepened winter snow increases stem growth and alters stem δ 13 C and δ 15 N in evergreen dwarf shrub Cassiope tetragona in high-arctic Svalbard tundra

2015 ◽  
Vol 10 (4) ◽  
pp. 044008 ◽  
Author(s):  
Daan Blok ◽  
Stef Weijers ◽  
Jeffrey M Welker ◽  
Elisabeth J Cooper ◽  
Anders Michelsen ◽  
...  
Keyword(s):  
High Arctic ◽  
Stem Growth ◽  
Dwarf Shrub ◽  
Winter Snow ◽  
Cassiope Tetragona

Responses of Plant Litter Decomposition and Nitrogen Mineralisation to Simulated Environmental Change in a High Arctic Polar Semi-Desert and a Subarctic Dwarf Shrub Heath

Oikos ◽  
1995 ◽  
Vol 74 (3) ◽  
pp. 503 ◽  
Author(s):  
C. H. Robinson ◽  
P. A. Wookey ◽  
A. N. Parsons ◽  
J. A. Potter ◽  
T. V. Callaghan ◽  
...  
Keyword(s):  
Environmental Change ◽  
Litter Decomposition ◽  
High Arctic ◽  
Plant Litter ◽  
Dwarf Shrub ◽  
Nitrogen Mineralisation ◽  
Plant Litter Decomposition

scholarly journals Temperature sensitivity of willow dwarf shrub growth from two distinct High Arctic sites

2018 ◽  
Vol 63 (2) ◽  
pp. 167-181 ◽  
Author(s):  
Agata Buchwal ◽  
Stef Weijers ◽  
Daan Blok ◽  
Bo Elberling
Keyword(s):  
Temperature Sensitivity ◽  
High Arctic ◽  
Dwarf Shrub

Microscale pattern of vascular plant distribution in two high arctic plant communities

1984 ◽  
Vol 62 (10) ◽  
pp. 2033-2042 ◽  
Author(s):  
E. H. Sohlberg ◽  
L. C. Bliss
Keyword(s):  
Distribution Pattern ◽  
Vascular Plants ◽  
Vascular Plant ◽  
Extreme Environments ◽  
Niche Differentiation ◽  
Bare Soil ◽  
High Arctic ◽  
Plant Distribution ◽  
Wind Speeds ◽  
Point Quadrat

Microscale pattern is of crucial importance in determining the distribution of vascular plants in the extreme environments of the High Arctic. Point-quadrat analysis of the distribution of the vascular plants in a mesic cryptogam–herb meadow and a xeric Puccinellia barren found a nonrandom distribution of vascular species. Most species were found growing in moss turfs versus crustose lichen or bare soil surfaces in the meadow and in desiccation cracks in the barren. Two species showed an opposite distribution pattern in the meadow indicating that incipient niche differentiation occurs in the High Arctic. Quadrat sampling showed that seed distribution was random in the meadow and only slightly skewed toward cracks in the barren. Microsites appeared to be crucial to the seedling establishment and adult distribution pattern for Papaver radicatum but less important for Ranunculus sabinei. Microclimate analyses showed that soil temperatures were higher, wind speeds were lower, soil moisture content was greater, and nitrate levels were higher in the microsites usually preferred by plants.

scholarly journals Experimental icing affects growth, mortality, and flowering in a high Arctic dwarf shrub

2016 ◽  
Vol 6 (7) ◽  
pp. 2139-2148 ◽  
Author(s):  
Jos M. Milner ◽  
Øystein Varpe ◽  
René Wal ◽  
Brage Bremset Hansen
Keyword(s):  
High Arctic ◽  
Dwarf Shrub

High Arctic summer warming tracked by increased Cassiope tetragona growth in the world's northernmost polar desert

2017 ◽  
Vol 23 (11) ◽  
pp. 5006-5020 ◽  
Author(s):  
Stef Weijers ◽  
Agata Buchwal ◽  
Daan Blok ◽  
Jörg Löffler ◽  
Bo Elberling
Keyword(s):  
High Arctic ◽  
Polar Desert ◽  
Cassiope Tetragona ◽  
Summer Warming ◽  
Arctic Summer
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