Pinus and Betula pollen accumulation rates from the northern boreal forest as a record of interannual variation in July temperature

2009 ◽  
Vol 24 (5) ◽  
pp. 513-521 ◽  
Author(s):  
Mari Kuoppamaa ◽  
Antti Huusko ◽  
Sheila Hicks
Keyword(s):  
Boreal Forest ◽  
Interannual Variation ◽  
Accumulation Rates ◽  
Betula Pollen ◽  
Pollen Accumulation Rates ◽  
July Temperature

Modern pollen accumulation rates at the north-western fringe of the European boreal forest

2008 ◽  
Vol 151 (3-4) ◽  
pp. 90-109 ◽  
Author(s):  
Martina Hättestrand ◽  
Christin Jensen ◽  
Margrét Hallsdóttir ◽  
Karl-Dag Vorren
Keyword(s):  
Boreal Forest ◽  
Accumulation Rates ◽  
The North ◽  
Pollen Accumulation Rates ◽  
Modern Pollen ◽  
North Western

Absolute pollen frequencies and carbon-14 age of a section of Holocene Lake sediment from the Riding Mountain area of Manitoba

1969 ◽  
Vol 47 (9) ◽  
pp. 1345-1349 ◽  
Author(s):  
J. C. Ritchie
Keyword(s):  
Boreal Forest ◽  
Lake Sediment ◽  
Present Form ◽  
Accumulation Rates ◽  
Mountain Area ◽  
Carbon 14 ◽  
Pollen Accumulation Rates ◽  
Grassland Type ◽  
Aspen Parkland ◽  
Frequency Diagram

A section of Holocene lake sediment in the Southern Boreal Forest of Manitoba was re-sampled, and the sedimentation rate (0.039 cm per annum) calculated from eight carbon-14 age determinations. Pollen accumulation rates were computed, and an absolute pollen frequency diagram constructed. It suggests modifications of an earlier reconstruction of vegetation, based on relative pollen frequencies. A spruce-dominated assemblage occurred from about 11 500 to 10 000 B.P., when there was a change to a treeless vegetation of a grassland type. This persisted until about 2500 B.P., with the possible interpolation of an aspen parkland phase from 6500 to 2500 B.P. The boreal forest in its present form (dominated by spruce, birch, and aspen, with local occurrences of pine, fir, larch, and oak) returned at 2500 B.P., presumably in response to a deterioration in climate (cooler and (or) wetter).

Annual and interannual variation in boreal forest aerosol particle number and volume concentration and their connection to particle formation

Tellus B ◽  
2008 ◽  
Vol 60 (4) ◽  
Author(s):  
Miikka Dal Maso ◽  
Antti Hyvärinen ◽  
Mika Komppula ◽  
Peter Tunved ◽  
Veli-Matti Kerminen ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Aerosol Particle ◽  
Interannual Variation ◽  
Particle Number ◽  
Volume Concentration ◽  
Particle Formation

scholarly journals Linking modern pollen accumulation rates to biomass: Quantitative vegetation reconstruction in the western Klamath Mountains, NW California, USA

The Holocene ◽  
2021 ◽  
pp. 095968362098803
Author(s):  
Clarke A Knight ◽  
Mark Baskaran ◽  
M Jane Bunting ◽  
Marie Champagne ◽  
Matthew D Potts ◽  
...  
Keyword(s):  
Mean Squared Error ◽  
Plant Biomass ◽  
Source Area ◽  
Pollen Deposition ◽  
Accumulation Rates ◽  
Klamath Mountains ◽  
Plant Abundance ◽  
Circular Area ◽  
Value Analysis ◽  
Pollen Accumulation Rates

Quantitative reconstructions of vegetation abundance from sediment-derived pollen systems provide unique insights into past ecological conditions. Recently, the use of pollen accumulation rates (PAR, grains cm−2 year−1) has shown promise as a bioproxy for plant abundance. However, successfully reconstructing region-specific vegetation dynamics using PAR requires that accurate assessments of pollen deposition processes be quantitatively linked to spatially-explicit measures of plant abundance. Our study addressed these methodological challenges. Modern PAR and vegetation data were obtained from seven lakes in the western Klamath Mountains, California. To determine how to best calibrate our PAR-biomass model, we first calculated the spatial area of vegetation where vegetation composition and patterning is recorded by changes in the pollen signal using two metrics. These metrics were an assemblage-level relevant source area of pollen (aRSAP) derived from extended R-value analysis ( sensu Sugita, 1993) and a taxon-specific relevant source area of pollen (tRSAP) derived from PAR regression ( sensu Jackson, 1990). To the best of our knowledge, aRSAP and tRSAP have not been directly compared. We found that the tRSAP estimated a smaller area for some taxa (e.g. a circular area with a 225 m radius for Pinus) than the aRSAP (a circular area with a 625 m radius). We fit linear models to relate PAR values from modern lake sediments with empirical, distance-weighted estimates of aboveground live biomass (AGLdw) for both the aRSAP and tRSAP distances. In both cases, we found that the PARs of major tree taxa – Pseudotsuga, Pinus, Notholithocarpus, and TCT (Taxodiaceae, Cupressaceae, and Taxaceae families) – were statistically significant and reasonably precise estimators of contemporary AGLdw. However, predictions weighted by the distance defined by aRSAP tended to be more precise. The relative root-mean squared error for the aRSAP biomass estimates was 9% compared to 12% for tRSAP. Our results demonstrate that calibrated PAR-biomass relationships provide a robust method to infer changes in past plant biomass.

scholarly journals Signals of tree volume and temperature in a high-resolution record of pollen accumulation rates in northern Finland

2012 ◽  
Vol 27 (6) ◽  
pp. 564-574 ◽  
Author(s):  
F. Mazier ◽  
A. B. Nielsen ◽  
A. Broström ◽  
S. Sugita ◽  
S. Hicks
Keyword(s):  
High Resolution ◽  
Accumulation Rates ◽  
Pollen Accumulation Rates

Revisiting pollen accumulation rates from Swedish lake sediments

The Holocene ◽  
2008 ◽  
Vol 18 (2) ◽  
pp. 293-305 ◽  
Author(s):  
Thomas Giesecke ◽  
Sonia L. Fontana
Keyword(s):  
Lake Sediments ◽  
Accumulation Rates ◽  
Pollen Accumulation Rates
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