Skip to search formSkip to main contentSkip to account menu

Calamagrostis canadensis

National Institutes of Health

Papers overview

Semantic Scholar uses AI to extract papers important to this topic.
Review
2016
Review
2016
......................................................................................................................................... ii Preface ........................................................................................................................................... iv Table of Contents ...........................................................................................................................v List of Tables .................................................................................................................................. x List of Figures .............................................................................................................................. xii List of Abbreviations ................................................................................................................... xv Acknowledgements .................................................................................................................... xvi Chapter 1: Introduction ................................................................................................................1 1.1 Overview ............................................................................................................................ 1 1.2 Literature review ................................................................................................................ 2 1.2.1 The Arctic ecosystem .................................................................................................. 2 1.2.2 Permafrost & Arctic ecosystem fluxes ....................................................................... 3 1.2.2.1 Permafrost thaw implications .............................................................................. 3 1.2.2.2 Net ecosystem exchange ...................................................................................... 4 1.2.3 Disturbance ecology .................................................................................................... 5 1.2.4 Thermokarst disturbances ........................................................................................... 7 1.2.4.1 Active layer detachment slides (ALDS) .............................................................. 8 1.2.4.2 Retrogressive thaw slumps (RTS) ..................................................................... 10 1.2.5 Climate impacts of ALDS and RTS .......................................................................... 13 1.3 Research objectives .......................................................................................................... 15 1.4 Structure of the thesis ....................................................................................................... 17 vi 1.5 Introduction to the study area .......................................................................................... 18 1.5.1 Previous research at the study location ..................................................................... 19 Chapter 2: Vegetation succession after permafrost disturbance on the Fosheim Peninsula, Ellesmere Island ...........................................................................................................................21 2.1 Overview .......................................................................................................................... 21 2.2 Introduction ...................................................................................................................... 22 2.3 Methods............................................................................................................................ 24 2.3.1 Study site ................................................................................................................... 24 2.3.2 Vegetation sampling (1994 and 2012) ...................................................................... 28 2.3.2.1 Active layer detachment slides .......................................................................... 28 2.3.2.2 Retrogressive thaw slumps ................................................................................ 29 2.3.3 Comprehensive site characterization (2012) ............................................................. 30 2.3.3.1 Soil moisture and active layer depth .................................................................. 30 2.3.3.2 Soil nutrient availability ..................................................................................... 30 2.3.3.3 Soil temperature ................................................................................................. 30 2.3.4 Statistical analysis ..................................................................................................... 31 2.3.4.1 Time comparison ............................................................................................... 31 2.3.4.2 Vegetation composition and cover ..................................................................... 31 2.3.4.3 Soil moisture and active layer depth .................................................................. 32 2.3.4.4 Soil temperature ................................................................................................. 33 2.4 Results .............................................................................................................................. 33 2.4.1 Comparison of historical and modern data ............................................................... 33 2.4.1.1 Vegetation community composition and cover ................................................. 33 vii 2.4.2 Comparison of plant communities in disturbances sampled in 2012 ....................... 36 2.4.3 Retrogressive thaw slump vegetation analysis ......................................................... 40 2.4.4 Site characteristics of disturbances sampled in 2012 ................................................ 42 2.4.4.1 Soil moisture ...................................................................................................... 42 2.4.4.2 Active layer depth .............................................................................................. 43 2.4.4.3 Soil temperature ................................................................................................. 45 2.4.4.4 Soil nutrients ...................................................................................................... 47 2.5 Discussion ........................................................................................................................ 50 2.5.1 Successional response ............................................................................................... 50 2.5.2 Soil characteristics .................................................................................................... 54 2.5.3 Permafrost thaw implications ................................................................................... 55 2.6 Conclusion ....................................................................................................................... 56 Chapter 3: Variability of the impacts of active retrogressive thaw slumps on net ecosystem exchange in the Canadian High Arctic ......................................................................................58 3.1 Overview .......................................................................................................................... 58 3.2 Introduction ...................................................................................................................... 59 3.3 Materials and methods ..................................................................................................... 62 3.3.1 Study area .................................................................................................................. 62 3.3.2 Site selection ............................................................................................................. 63 3.3.3 Vegetation sampling ................................................................................................. 66 3.3.4 Soil characteristics .................................................................................................... 67 3.3.5 Portable CO2 efflux chamber system ........................................................................ 68 3.3.6 Eddy covariance measurement of NEE .................................................................... 70 viii 3.3.7 Flux data processing ................................................................................................. 71 3.3.8 Statistical analysis ..................................................................................................... 72 3.4 Results .............................................................................................................................. 73 3.4.1 Micrometeorological conditions ............................................................................... 73 3.4.2 Vegetation ................................................................................................................. 75 3.4.3 Thermal regime ......................................................................................................... 77 3.4.4 Moisture regime ........................................................................................................ 79 3.4.5 Nutrient availability .................................................................................................. 81 3.4.6 Ecosystem respiration ............................................................................................... 82 3.4.7 Net ecosystem exchange (NEE) ................................................................................ 83 3.5 Discussion ........................................................................................................................ 85 3.6 Conclusions ....................................................................... 
2009
2009
Grasses are widely used in revegetation to control erosion, build soil and maintain habitat. In northeast British Columbia, non… 
Review
2005
Review
2005
Many wetlands of the Great Lakes region are increasingly dominated by species of cattails, including the native Typha latifolia… 
1991
1991
SummaryA series of laboratory experiments was conducted to examine seasonal change in shoot regrowth potential following… 
1984
1984
The water depth in marshes occurring along Lake Michigan is largely controlled by fluctuations of the Lake Michigan water level… 
1977
1977
Thirty stands of Picea-Abies dominated forest in highland areas of northern Alberta were studied quantitatively. The highlands… 
1976
1976
SummarySeasonal and total primary productivity was measured for a Carex meadow in southern Quebec, Canada. Forty-five one-meter2… 
1967
1967
Anguina calamagrostis n. sp., found infesting bluejoint grass, Calamagrostis canadensis (Michx.) Nutt., from Canada is described…