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Our objective was to determine how Picea glauca (Moench) Voss trees on the Yukon plateau developed over time through the analysis of tree trunks. Our general null hypothesis was: if year-to-year climatic variation is the primary factor determining the magnitude of yearly radial growth, then within-tree and between-tree dendrochronological comparisons of annual ring width should generate Pearson product-moment correlation coefficients (PMCCs) near 1 for similar timberline position and, plausibly, lower PMCCs when comparing trees at different positions. Ring widths of nine trees were sequentially measured across the four cardinal direction radii of disks taken from 1 m trunk intervals. PMCCs of those radial series...
A 3-compartment model was formulated to simulate the dynamic development of mass, N concentrations and C/N ratios in decomposing forest litterbags, over time, across a wide range of climate, site and litter type conditions, based on 8 predictor variables and 12 best-fitted parameters. The compartments refer to the fast, slowly and very slowly decomposing fractions of the litter. The model was calibrated with the 1992 to 2000 litterbag data of the Canadian Intersite Decomposition Experiment (CIDET), involving 10 different litter types (Trembling Aspen, American Beech, Douglas Fir, White Birch, Jack Pine, Black Spruce, Tamarack, Western Red Cedar, Bracken Fern, Plains Rough Fescue). These bags were distributed across...
A 3-compartment model was formulated to simulate the dynamic development of mass, N concentrations and C/N ratios in decomposing forest litterbags, over time, across a wide range of climate, site and litter type conditions, based on 8 predictor variables and 12 best-fitted parameters. The compartments refer to the fast, slowly and very slowly decomposing fractions of the litter. The model was calibrated with the 1992 to 2000 litterbag data of the Canadian Intersite Decomposition Experiment (CIDET), involving 10 different litter types (Trembling Aspen, American Beech, Douglas Fir, White Birch, Jack Pine, Black Spruce, Tamarack, Western Red Cedar, Bracken Fern, Plains Rough Fescue). These bags were distributed across...
Black spruce (Picea mariana (Mill.) B.S.P) is a widespread transcontinental and important tree species of the Canadian boreal forest region, and is found in almost all forested regions of Canada. Genetic diversity and population structure of black spruce has only been examined within a limited range and within a single province in Canada. There is no reported information on comparison of genetic diversity and population structure of black spruce from selected northwestern and southeastern populations. The objective of the present study was to determine and compare genetic diversity and population structure of four selected natural populations of black spruce sampled from the northwestern (Yukon (YK), Yellowknife...
Categories: Publication;
Types: Citation;
Tags: M1-Changes in Plant and Animal Distributon,
M1-Ecosystems
Lake sediment records from Eikland and Antifreeze Ponds provide a history of environmental change for the past >20,000 and >30,000 calendar years before present (cal yr B.P.), respectively. Vegetation histories of these two sites are compared to test the theory that Beringia was a productive grassland during the last glacial maximum, and to determine the timing of the early Holocene thermal maximum in the southwestern Yukon. Additionally, an earlier Antifreeze Pond chronology has been revised, based on 26 AMS 14 C dates. Herbs dominated a Mid-Wisconsinan interstadial (>30,000 cal yr B.P.); however, Betula shrub tundra with some Picea became established in the later portion. During the late-glacial period both sites...
Black spruce (Picea mariana (Mill.) B.S.P) is a widespread transcontinental and important tree species of the Canadian boreal forest region, and is found in almost all forested regions of Canada. Genetic diversity and population structure of black spruce has only been examined within a limited range and within a single province in Canada. There is no reported information on comparison of genetic diversity and population structure of black spruce from selected northwestern and southeastern populations. The objective of the present study was to determine and compare genetic diversity and population structure of four selected natural populations of black spruce sampled from the northwestern (Yukon (YK), Yellowknife...
Our objective was to determine how Picea glauca (Moench) Voss trees on the Yukon plateau developed over time through the analysis of tree trunks. Our general null hypothesis was: if year-to-year climatic variation is the primary factor determining the magnitude of yearly radial growth, then within-tree and between-tree dendrochronological comparisons of annual ring width should generate Pearson product-moment correlation coefficients (PMCCs) near 1 for similar timberline position and, plausibly, lower PMCCs when comparing trees at different positions. Ring widths of nine trees were sequentially measured across the four cardinal direction radii of disks taken from 1 m trunk intervals. PMCCs of those radial series...
Categories: Data,
Publication;
Types: Citation,
Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Monitoring 1-Changes in Plant and Animal Distribution: Ecosystems
Lake sediment records from Eikland and Antifreeze Ponds provide a history of environmental change for the past >20,000 and >30,000 calendar years before present (cal yr B.P.), respectively. Vegetation histories of these two sites are compared to test the theory that Beringia was a productive grassland during the last glacial maximum, and to determine the timing of the early Holocene thermal maximum in the southwestern Yukon. Additionally, an earlier Antifreeze Pond chronology has been revised, based on 26 AMS 14 C dates. Herbs dominated a Mid-Wisconsinan interstadial (>30,000 cal yr B.P.); however, Betula shrub tundra with some Picea became established in the later portion. During the late-glacial period both sites...
Our objective was to determine how Picea glauca (Moench) Voss trees on the Yukon plateau developed over time through the analysis of tree trunks. Our general null hypothesis was: if year-to-year climatic variation is the primary factor determining the magnitude of yearly radial growth, then within-tree and between-tree dendrochronological comparisons of annual ring width should generate Pearson product-moment correlation coefficients (PMCCs) near 1 for similar timberline position and, plausibly, lower PMCCs when comparing trees at different positions. Ring widths of nine trees were sequentially measured across the four cardinal direction radii of disks taken from 1 m trunk intervals. PMCCs of those radial series...
Categories: Publication;
Types: Citation;
Tags: Monitoring 1-Changes in Plant and Animal Distribution: Ecosystems
Black spruce (Picea mariana (Mill.) B.S.P) is a widespread transcontinental and important tree species of the Canadian boreal forest region, and is found in almost all forested regions of Canada. Genetic diversity and population structure of black spruce has only been examined within a limited range and within a single province in Canada. There is no reported information on comparison of genetic diversity and population structure of black spruce from selected northwestern and southeastern populations. The objective of the present study was to determine and compare genetic diversity and population structure of four selected natural populations of black spruce sampled from the northwestern (Yukon (YK), Yellowknife...
Lake sediment records from Eikland and Antifreeze Ponds provide a history of environmental change for the past >20,000 and >30,000 calendar years before present (cal yr B.P.), respectively. Vegetation histories of these two sites are compared to test the theory that Beringia was a productive grassland during the last glacial maximum, and to determine the timing of the early Holocene thermal maximum in the southwestern Yukon. Additionally, an earlier Antifreeze Pond chronology has been revised, based on 26 AMS 14 C dates. Herbs dominated a Mid-Wisconsinan interstadial (>30,000 cal yr B.P.); however, Betula shrub tundra with some Picea became established in the later portion. During the late-glacial period both sites...
A 3-compartment model was formulated to simulate the dynamic development of mass, N concentrations and C/N ratios in decomposing forest litterbags, over time, across a wide range of climate, site and litter type conditions, based on 8 predictor variables and 12 best-fitted parameters. The compartments refer to the fast, slowly and very slowly decomposing fractions of the litter. The model was calibrated with the 1992 to 2000 litterbag data of the Canadian Intersite Decomposition Experiment (CIDET), involving 10 different litter types (Trembling Aspen, American Beech, Douglas Fir, White Birch, Jack Pine, Black Spruce, Tamarack, Western Red Cedar, Bracken Fern, Plains Rough Fescue). These bags were distributed across...
Categories: Publication;
Types: Citation;
Tags: Monitoring 1-Changes in Plant and Animal Distribution: Flora
Black spruce (Picea mariana (Mill.) B.S.P) is a widespread transcontinental and important tree species of the Canadian boreal forest region, and is found in almost all forested regions of Canada. Genetic diversity and population structure of black spruce has only been examined within a limited range and within a single province in Canada. There is no reported information on comparison of genetic diversity and population structure of black spruce from selected northwestern and southeastern populations. The objective of the present study was to determine and compare genetic diversity and population structure of four selected natural populations of black spruce sampled from the northwestern (Yukon (YK), Yellowknife...
Categories: Publication;
Types: Citation;
Tags: M1-Changes in Plant and Animal Distributon,
M1-Ecosystems
Lake sediment records from Eikland and Antifreeze Ponds provide a history of environmental change for the past >20,000 and >30,000 calendar years before present (cal yr B.P.), respectively. Vegetation histories of these two sites are compared to test the theory that Beringia was a productive grassland during the last glacial maximum, and to determine the timing of the early Holocene thermal maximum in the southwestern Yukon. Additionally, an earlier Antifreeze Pond chronology has been revised, based on 26 AMS 14 C dates. Herbs dominated a Mid-Wisconsinan interstadial (>30,000 cal yr B.P.); however, Betula shrub tundra with some Picea became established in the later portion. During the late-glacial period both sites...
Black spruce (Picea mariana (Mill.) B.S.P) is a widespread transcontinental and important tree species of the Canadian boreal forest region, and is found in almost all forested regions of Canada. Genetic diversity and population structure of black spruce has only been examined within a limited range and within a single province in Canada. There is no reported information on comparison of genetic diversity and population structure of black spruce from selected northwestern and southeastern populations. The objective of the present study was to determine and compare genetic diversity and population structure of four selected natural populations of black spruce sampled from the northwestern (Yukon (YK), Yellowknife...
Categories: Publication;
Types: Citation;
Tags: M1-Changes in Plant and Animal Distributon,
M1-Ecosystems
A 3-compartment model was formulated to simulate the dynamic development of mass, N concentrations and C/N ratios in decomposing forest litterbags, over time, across a wide range of climate, site and litter type conditions, based on 8 predictor variables and 12 best-fitted parameters. The compartments refer to the fast, slowly and very slowly decomposing fractions of the litter. The model was calibrated with the 1992 to 2000 litterbag data of the Canadian Intersite Decomposition Experiment (CIDET), involving 10 different litter types (Trembling Aspen, American Beech, Douglas Fir, White Birch, Jack Pine, Black Spruce, Tamarack, Western Red Cedar, Bracken Fern, Plains Rough Fescue). These bags were distributed across...
Lake sediment records from Eikland and Antifreeze Ponds provide a history of environmental change for the past >20,000 and >30,000 calendar years before present (cal yr B.P.), respectively. Vegetation histories of these two sites are compared to test the theory that Beringia was a productive grassland during the last glacial maximum, and to determine the timing of the early Holocene thermal maximum in the southwestern Yukon. Additionally, an earlier Antifreeze Pond chronology has been revised, based on 26 AMS 14 C dates. Herbs dominated a Mid-Wisconsinan interstadial (>30,000 cal yr B.P.); however, Betula shrub tundra with some Picea became established in the later portion. During the late-glacial period both sites...
Categories: Data,
Publication;
Types: Citation,
Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Paleo and Holocene
Our objective was to determine how Picea glauca (Moench) Voss trees on the Yukon plateau developed over time through the analysis of tree trunks. Our general null hypothesis was: if year-to-year climatic variation is the primary factor determining the magnitude of yearly radial growth, then within-tree and between-tree dendrochronological comparisons of annual ring width should generate Pearson product-moment correlation coefficients (PMCCs) near 1 for similar timberline position and, plausibly, lower PMCCs when comparing trees at different positions. Ring widths of nine trees were sequentially measured across the four cardinal direction radii of disks taken from 1 m trunk intervals. PMCCs of those radial series...
A 3-compartment model was formulated to simulate the dynamic development of mass, N concentrations and C/N ratios in decomposing forest litterbags, over time, across a wide range of climate, site and litter type conditions, based on 8 predictor variables and 12 best-fitted parameters. The compartments refer to the fast, slowly and very slowly decomposing fractions of the litter. The model was calibrated with the 1992 to 2000 litterbag data of the Canadian Intersite Decomposition Experiment (CIDET), involving 10 different litter types (Trembling Aspen, American Beech, Douglas Fir, White Birch, Jack Pine, Black Spruce, Tamarack, Western Red Cedar, Bracken Fern, Plains Rough Fescue). These bags were distributed across...
Categories: Publication;
Types: Citation;
Tags: Monitoring 1-Changes in Plant and Animal Distribution: Flora
Our objective was to determine how Picea glauca (Moench) Voss trees on the Yukon plateau developed over time through the analysis of tree trunks. Our general null hypothesis was: if year-to-year climatic variation is the primary factor determining the magnitude of yearly radial growth, then within-tree and between-tree dendrochronological comparisons of annual ring width should generate Pearson product-moment correlation coefficients (PMCCs) near 1 for similar timberline position and, plausibly, lower PMCCs when comparing trees at different positions. Ring widths of nine trees were sequentially measured across the four cardinal direction radii of disks taken from 1 m trunk intervals. PMCCs of those radial series...
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