Aki Pitkänen
Biographic Data
| ID | 6571330 |
|---|---|
| NAME | Aki Pitkänen |
| GIVEN NAMES | Aki |
| FAMILY NAME | Pitkänen |
| SIGNATURE | PITKÄNEN A |
| AFFILIATIONS | Department of Ecology, Karelian Institute, University of Joensuu, Finland |
| VERIFIED | No |
| TOTAL WORKS | 6 |
| TOTAL CITATIONS | 24 |
| AUTHOR COUNT | 6 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1999 |
| LATEST PUBLICATION YEAR | 2002 |
| H-INDEX | 3 |
Holocene vegetation history from the Salym-Yugan Mire Area, West Siberia
The pollen stratigraphy of an ombrotrophic patterned ridge-hollow raised bog in the Salym-Yugan Mire Area in boreal West Siberia (60°109N, 72°509E) covers the entire Holocene period. Pollen data from three parallel peat cores suggest that, contrary to previous assumptions, Betula forests did not spread into tundra until the Boreal period (9000–10000 cal. BP). After 9000 cal. BP, Pinus sylvestris and Picea abies forests displaced Betula forests in…
A basin-based approach to the long-term history of forest fires as determined from peat strata
Valid reconstruction of long-term forest fire histories from individual peat cores usually fails, for a number of reasons, even though visible charcoal horizons in peat are indisputable evidence of local or in-situ fires. Both the dating and reliability of fire records from peat can be improved by the means of a ‘basin-based approach’, in which the gradual lateral growth of the peat is studied carefully by means of numerous dated basal peat sampl…
Fire frequency and forest structure at a dry site between AD 440 and 1110 based on charcoal and pollen records from a laminated lake sediment in eastern Finland
The fire history of a dry Boreal forest site in eastern Finland before settlement in the area was studied by means of charcoal and pollen analysis of annually laminated lake sediments. The average estimated local fire interval of 70-80 years corresponds to values quoted in a few earlier Finnish studies based on annually laminated lake sediments from more mesic sites. The fire interval is longer than expected from dendrochronological results obtai…
A 1300-year forest-fire history at a site in eastern Finland based on charcoal and pollen records in laminated lake sediment
The charcoal and pollen stratigraphy of an annually laminated sediment of a small lake in eastern Finland (63°109N, 30°589E) was examined, and found to cover a period of 1300 years. The region around the lake is remote and nowadays almost unpopulated. The fire interval around the study lake was 85 years, with a range of 60–134 years during the 900-year period before any major human influence, and the corresponding fire rotation time estimate was …
Comparison of sedimentary microscopic charcoal particle records in a small lake with dendrochronological data
Dendrochronological data and microscopic charcoal particle series from annually laminated lake sediment covering the past 520 years were compared. Slash-and-burn cultivation had been practised in the area (63°109N, 30°589E) for about 300 years during this period, causing a considerable increase in the number of forest fires. The fire years based on fire-scar data coincided with peaks in the microscopic charcoal series, suggesting that a significa…
The role of fire in the carbon dynamics of a mire, eastern Finland
The fire history and the effect of fires on the long-term (apparent) rate of carbon accumulation (LORCA) in the Patvinsuo mire complex, eastern Finland, were determined through stratigraphic and pollen analyses of 98 peat cores. The peat cores were characterized by a large number of charcoal layers and the age of the basal peat varied between 57 and 10 500 years. Mire fires slowed down the progress of vertical peat accumulation and resulted in gr…
Comparison of sedimentary microscopic charcoal particle records in a small lake with dendrochronological data
Dendrochronological data and microscopic charcoal particle series from annually laminated lake sediment covering the past 520 years were compared. Slash-and-burn cultivation had been practised in the area (63°109N, 30°589E) for about 300 years during this period, causing a considerable increase in the number of forest fires. The fire years based on fire-scar data coincided with peaks in the microscopic charcoal series, suggesting that a significa…
A basin-based approach to the long-term history of forest fires as determined from peat strata
Valid reconstruction of long-term forest fire histories from individual peat cores usually fails, for a number of reasons, even though visible charcoal horizons in peat are indisputable evidence of local or in-situ fires. Both the dating and reliability of fire records from peat can be improved by the means of a ‘basin-based approach’, in which the gradual lateral growth of the peat is studied carefully by means of numerous dated basal peat sampl…
The role of fire in the carbon dynamics of a mire, eastern Finland
The fire history and the effect of fires on the long-term (apparent) rate of carbon accumulation (LORCA) in the Patvinsuo mire complex, eastern Finland, were determined through stratigraphic and pollen analyses of 98 peat cores. The peat cores were characterized by a large number of charcoal layers and the age of the basal peat varied between 57 and 10 500 years. Mire fires slowed down the progress of vertical peat accumulation and resulted in gr…
Holocene vegetation history from the Salym-Yugan Mire Area, West Siberia
The pollen stratigraphy of an ombrotrophic patterned ridge-hollow raised bog in the Salym-Yugan Mire Area in boreal West Siberia (60°109N, 72°509E) covers the entire Holocene period. Pollen data from three parallel peat cores suggest that, contrary to previous assumptions, Betula forests did not spread into tundra until the Boreal period (9000–10000 cal. BP). After 9000 cal. BP, Pinus sylvestris and Picea abies forests displaced Betula forests in…
Fire frequency and forest structure at a dry site between AD 440 and 1110 based on charcoal and pollen records from a laminated lake sediment in eastern Finland
The fire history of a dry Boreal forest site in eastern Finland before settlement in the area was studied by means of charcoal and pollen analysis of annually laminated lake sediments. The average estimated local fire interval of 70-80 years corresponds to values quoted in a few earlier Finnish studies based on annually laminated lake sediments from more mesic sites. The fire interval is longer than expected from dendrochronological results obtai…
A 1300-year forest-fire history at a site in eastern Finland based on charcoal and pollen records in laminated lake sediment
The charcoal and pollen stratigraphy of an annually laminated sediment of a small lake in eastern Finland (63°109N, 30°589E) was examined, and found to cover a period of 1300 years. The region around the lake is remote and nowadays almost unpopulated. The fire interval around the study lake was 85 years, with a range of 60–134 years during the 900-year period before any major human influence, and the corresponding fire rotation time estimate was …
A 1300-year forest-fire history at a site in eastern Finland based on charcoal and pollen records in laminated lake sediment
The charcoal and pollen stratigraphy of an annually laminated sediment of a small lake in eastern Finland (63°109N, 30°589E) was examined, and found to cover a period of 1300 years. The region around the lake is remote and nowadays almost unpopulated. The fire interval around the study lake was 85 years, with a range of 60–134 years during the 900-year period before any major human influence, and the corresponding fire rotation time estimate was …
Comparison of sedimentary microscopic charcoal particle records in a small lake with dendrochronological data
Dendrochronological data and microscopic charcoal particle series from annually laminated lake sediment covering the past 520 years were compared. Slash-and-burn cultivation had been practised in the area (63°109N, 30°589E) for about 300 years during this period, causing a considerable increase in the number of forest fires. The fire years based on fire-scar data coincided with peaks in the microscopic charcoal series, suggesting that a significa…
The role of fire in the carbon dynamics of a mire, eastern Finland
The fire history and the effect of fires on the long-term (apparent) rate of carbon accumulation (LORCA) in the Patvinsuo mire complex, eastern Finland, were determined through stratigraphic and pollen analyses of 98 peat cores. The peat cores were characterized by a large number of charcoal layers and the age of the basal peat varied between 57 and 10 500 years. Mire fires slowed down the progress of vertical peat accumulation and resulted in gr…
Fire frequency and forest structure at a dry site between AD 440 and 1110 based on charcoal and pollen records from a laminated lake sediment in eastern Finland
The fire history of a dry Boreal forest site in eastern Finland before settlement in the area was studied by means of charcoal and pollen analysis of annually laminated lake sediments. The average estimated local fire interval of 70-80 years corresponds to values quoted in a few earlier Finnish studies based on annually laminated lake sediments from more mesic sites. The fire interval is longer than expected from dendrochronological results obtai…
A basin-based approach to the long-term history of forest fires as determined from peat strata
Valid reconstruction of long-term forest fire histories from individual peat cores usually fails, for a number of reasons, even though visible charcoal horizons in peat are indisputable evidence of local or in-situ fires. Both the dating and reliability of fire records from peat can be improved by the means of a ‘basin-based approach’, in which the gradual lateral growth of the peat is studied carefully by means of numerous dated basal peat sampl…
Holocene vegetation history from the Salym-Yugan Mire Area, West Siberia
The pollen stratigraphy of an ombrotrophic patterned ridge-hollow raised bog in the Salym-Yugan Mire Area in boreal West Siberia (60°109N, 72°509E) covers the entire Holocene period. Pollen data from three parallel peat cores suggest that, contrary to previous assumptions, Betula forests did not spread into tundra until the Boreal period (9000–10000 cal. BP). After 9000 cal. BP, Pinus sylvestris and Picea abies forests displaced Betula forests in…
Environmental Science (6 works) · Geography (6 works) · Geology (6 works) · Geology and Paleoclimatology Research (6 works) · Physical geography (6 works) · Archaeology (5 works) · Charcoal (5 works) · Paleontology (5 works) · Biology (4 works) · Ecology (4 works)