Jill F Johnstone
Biographic Data
| ID | 6016700 |
|---|---|
| NAME | Jill F Johnstone |
| GIVEN NAMES | Jill F |
| FAMILY NAME | Johnstone |
| SIGNATURE | JOHNSTONE J F |
| AFFILIATIONS | University of Saskatchewan |
| ORCID | 0000-0001-6131-9339 |
| VERIFIED | Yes |
| TOTAL WORKS | 11 |
| TOTAL CITATIONS | 19 |
| AUTHOR COUNT | 11 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2004 |
| LATEST PUBLICATION YEAR | 2021 |
| H-INDEX | 3 |
Alpine Plant Life: Functional Plant Ecology of High Mountain Ecosystems. By Christian Körner
Reviewed: Alpine Plant Life: Functional Plant Ecology of High Mountain Ecosystems. By Christian Körner. Cham, Switzerland: Springer, 2021. 500 pp. Hardcover: US$ 119.99, ISBN 978-3-030-59537-1. E-book: US$ 89.00, ISBN 978-3-030-59538-8
Biomass offsets little or none of permafrost carbon release from soils, streams, and wildfire: An expert assessment
As the permafrost region warms, its large organic carbon pool will be increasingly vulnerable to decomposition, combustion, and hydrologic export. Models predict that some portion of this release will be offset by increased production of Arctic and boreal biomass; however, the lack of robust estimates of net carbon balance increases the risk of further overshooting international emissions targets. Precise empirical or model-based assessments of t…
Recovery of Tundra Vegetation Three Decades after Hydrocarbon Drilling with and without Seeding of Non-Native Grasses + Supplementary Appendices (See Article Tools)
Oil and gas exploration conducted in the 1970s left a legacy of abandoned test wells with sumps, containing drilling waste, in the Mackenzie Delta region of Canada’s Northwest Territories. One to two years after the wells were decommissioned, a set of sites were seeded with non-native grasses and fertilized to test whether these treatments could accelerate vegetation recovery and prevent erosion. We sampled seeded and unseeded sumps and adjacent …
Tree rings provide early warning signals of jack pine mortality across a moisture gradient in the southern boreal forest
Recent declines in productivity and tree survival have been widely observed in boreal forests. We used early warning signals (EWS) in tree ring data to anticipate premature mortality in jack pine ( Pinus banksiana )—an extensive and dominant species occurring across the moisture-limited southern boreal forest in North America. We sampled tree rings from 113 living and 84 dead trees in three soil moisture regimes (subxeric, submesic, subhygric) in…
Widespread negative correlations between black spruce growth and temperature across topographic moisture gradients in the boreal forest
The responses of tree growth to recent climate warming may signal changes in the susceptibility of forest communities to compositional change and consequently impact a wide range of ecosystem processes and services. Previous research in the boreal forest has largely documented negative growth responses to climate in forest species and habitats characteristic of drier conditions, emphasizing the sensitivity of drier or warmer landscape positions t…
Modeling the effects of fire severity and climate warming on active layer thickness and soil carbon storage of black spruce forests across the landscape in interior Alaska
There is a substantial amount of carbon stored in the permafrost soils of boreal forest ecosystems, where it is currently protected from decomposition. The surface organic horizons insulate the deeper soil from variations in atmospheric temperature. The removal of these insulating horizons through consumption by fire increases the vulnerability of permafrost to thaw, and the carbon stored in permafrost to decomposition. In this study we ask how w…
Our plants, our land: Bridging aboriginal generations through cross-cultural plant workshops
Changes in subsistence practices have negatively affected the social and economic structure of aboriginal communities across the Arctic. This has resulted in fewer opportunities for the transmission of traditional knowledge (TK). This article provides two case studies of how researchers can assist northern communities in TK transmission and provide a venue for science and TK to meet, thereby fostering a positive relationship between scientists an…
Expansion of Canopy-Forming Willows Over the Twentieth Century on Herschel Island, Yukon Territory, Canada
Multi-Decadal Changes in Tundra Environments and Ecosystems: Synthesis of the International Polar Year-Back to the Future Project (IPY-BTF)
Environmental Conditions and Vegetation Recovery at Abandoned Drilling Mud Sumps in the Mackenzie Delta Region, Northwest Territories, Canada
Historical data from oil and gas exploration in the delta of the Mackenzie River, Northwest Territories, in the 1970s provided an opportunity to estimate decadal-scale impacts of exploratory oil and gas drilling on native plant communities in low Arctic tundra. We assessed changes in vegetation composition and associated environmental gradients across seven drilling mud sumps in the Kendall Island Bird Sanctuary, Mackenzie Delta. Three decades af…
Global Change and the Boreal Forest: Thresholds, Shifting States or Gradual Change
Changes in boreal climate of the magnitude projected for the 21st century have always caused vegetation changes large enough to be societally important. However, the rates and patterns of vegetation change are difficult to predict. We review evidence suggesting that these vegetation changes may be gradual at the northern forest limit or where seed dispersal limits species distribution. However, forest composition may be quite resilient to climate…
Global Change and the Boreal Forest: Thresholds, Shifting States or Gradual Change
Changes in boreal climate of the magnitude projected for the 21st century have always caused vegetation changes large enough to be societally important. However, the rates and patterns of vegetation change are difficult to predict. We review evidence suggesting that these vegetation changes may be gradual at the northern forest limit or where seed dispersal limits species distribution. However, forest composition may be quite resilient to climate…
Multi-Decadal Changes in Tundra Environments and Ecosystems: Synthesis of the International Polar Year-Back to the Future Project (IPY-BTF)
Expansion of Canopy-Forming Willows Over the Twentieth Century on Herschel Island, Yukon Territory, Canada
Global Change and the Boreal Forest: Thresholds, Shifting States or Gradual Change
Changes in boreal climate of the magnitude projected for the 21st century have always caused vegetation changes large enough to be societally important. However, the rates and patterns of vegetation change are difficult to predict. We review evidence suggesting that these vegetation changes may be gradual at the northern forest limit or where seed dispersal limits species distribution. However, forest composition may be quite resilient to climate…
Environmental Conditions and Vegetation Recovery at Abandoned Drilling Mud Sumps in the Mackenzie Delta Region, Northwest Territories, Canada
Historical data from oil and gas exploration in the delta of the Mackenzie River, Northwest Territories, in the 1970s provided an opportunity to estimate decadal-scale impacts of exploratory oil and gas drilling on native plant communities in low Arctic tundra. We assessed changes in vegetation composition and associated environmental gradients across seven drilling mud sumps in the Kendall Island Bird Sanctuary, Mackenzie Delta. Three decades af…
Expansion of Canopy-Forming Willows Over the Twentieth Century on Herschel Island, Yukon Territory, Canada
Multi-Decadal Changes in Tundra Environments and Ecosystems: Synthesis of the International Polar Year-Back to the Future Project (IPY-BTF)
Our plants, our land: Bridging aboriginal generations through cross-cultural plant workshops
Changes in subsistence practices have negatively affected the social and economic structure of aboriginal communities across the Arctic. This has resulted in fewer opportunities for the transmission of traditional knowledge (TK). This article provides two case studies of how researchers can assist northern communities in TK transmission and provide a venue for science and TK to meet, thereby fostering a positive relationship between scientists an…
Modeling the effects of fire severity and climate warming on active layer thickness and soil carbon storage of black spruce forests across the landscape in interior Alaska
There is a substantial amount of carbon stored in the permafrost soils of boreal forest ecosystems, where it is currently protected from decomposition. The surface organic horizons insulate the deeper soil from variations in atmospheric temperature. The removal of these insulating horizons through consumption by fire increases the vulnerability of permafrost to thaw, and the carbon stored in permafrost to decomposition. In this study we ask how w…
Widespread negative correlations between black spruce growth and temperature across topographic moisture gradients in the boreal forest
The responses of tree growth to recent climate warming may signal changes in the susceptibility of forest communities to compositional change and consequently impact a wide range of ecosystem processes and services. Previous research in the boreal forest has largely documented negative growth responses to climate in forest species and habitats characteristic of drier conditions, emphasizing the sensitivity of drier or warmer landscape positions t…
Recovery of Tundra Vegetation Three Decades after Hydrocarbon Drilling with and without Seeding of Non-Native Grasses + Supplementary Appendices (See Article Tools)
Oil and gas exploration conducted in the 1970s left a legacy of abandoned test wells with sumps, containing drilling waste, in the Mackenzie Delta region of Canada’s Northwest Territories. One to two years after the wells were decommissioned, a set of sites were seeded with non-native grasses and fertilized to test whether these treatments could accelerate vegetation recovery and prevent erosion. We sampled seeded and unseeded sumps and adjacent …
Tree rings provide early warning signals of jack pine mortality across a moisture gradient in the southern boreal forest
Recent declines in productivity and tree survival have been widely observed in boreal forests. We used early warning signals (EWS) in tree ring data to anticipate premature mortality in jack pine ( Pinus banksiana )—an extensive and dominant species occurring across the moisture-limited southern boreal forest in North America. We sampled tree rings from 113 living and 84 dead trees in three soil moisture regimes (subxeric, submesic, subhygric) in…
Biomass offsets little or none of permafrost carbon release from soils, streams, and wildfire: An expert assessment
As the permafrost region warms, its large organic carbon pool will be increasingly vulnerable to decomposition, combustion, and hydrologic export. Models predict that some portion of this release will be offset by increased production of Arctic and boreal biomass; however, the lack of robust estimates of net carbon balance increases the risk of further overshooting international emissions targets. Precise empirical or model-based assessments of t…
Alpine Plant Life: Functional Plant Ecology of High Mountain Ecosystems. By Christian Körner
Reviewed: Alpine Plant Life: Functional Plant Ecology of High Mountain Ecosystems. By Christian Körner. Cham, Switzerland: Springer, 2021. 500 pp. Hardcover: US$ 119.99, ISBN 978-3-030-59537-1. E-book: US$ 89.00, ISBN 978-3-030-59538-8
Ecology (11 works) · Geography (10 works) · Environmental Science (8 works) · Biology (7 works) · Climate change and permafrost (6 works) · Physical geography (6 works) · Ecology (5 works) · Ecosystem (5 works) · Geology (5 works) · Arctic (4 works)