Development of a Downed Woody Debris Forecasting Tool Using Strategic-Scale Multiresource Forest Inventories

2016 ◽  
Keyword(s):  
Woody Debris ◽  
Forest Inventories ◽  
Downed Woody Debris

scholarly journals How to Evaluate Downed Fine Woody Debris Including Logging Residues?

Forests ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 881
Author(s):  
Nathalie Korboulewsky ◽  
Isabelle Bilger ◽  
Abdelwahab Bessaad
Keyword(s):  
Wood Density ◽  
Stock Assessment ◽  
Woody Debris ◽  
Diameter Class ◽  
Density Measurements ◽  
Fine Woody Debris ◽  
Forest Inventories ◽  
Test Zone ◽  
Fixed Area ◽  
Volume Estimates

Volume or biomass estimates of downed woody debris are crucial for numerous applications such as forest carbon stock assessment, biodiversity assessments, and more recently for environmental evaluations of biofuel harvesting practices. Both fixed-area sampling (FAS) and line-intersect sampling (LIS) are used in forest inventories and ecological studies because they are unbiased and accurate methods. Nevertheless, most studies and inventories take into account only coarse woody debris (CWD, >10 cm in diameter), although fine woody debris (FWD) can account for a large part of the total downed biomass. We compared the LIS and FAS methods for FWD volume or biomass estimates and evaluated the influence of diameter and wood density measurements, plot number and size. We used a Test Zone (a defined surface area where a complete inventory was carried out, in addition to FAS and LIS), a Pilot Stand (a forest stand where both LIS and FAS methods were applied) and results from 10 field inventories in deciduous temperate forest stands with various conditions and amounts of FWD. Both methods, FAS and LIS, provided accurate (in trueness and precision) volume estimates, but LIS proved to be the more efficient. Diameter measurement was the main source of error: using the mean diameter, even by diameter class, led to an error for volume estimates of around 35%. On the contrary, wood density measurements can be simplified without much influence on the accuracy of biomass estimates (use of mean density by diameter class). We show that the length and number of transects greatly influences the estimates, and that it is better to apply more, shorter transects than fewer, longer ones. Finally, we determined the optimal methodology and propose a simplification of some measurements to obtain the best time-precision trade-off for FWD inventories at the stand level.

scholarly journals Post-fire recovery of ecosystem carbon pools in a tropical mixed pine-hardwood forest

2020 ◽  
Vol 29 (1) ◽  
pp. e001
Author(s):  
Shatya Devi Quintero-Gradilla ◽  
Angelina Martínez-Yrizar ◽  
Felipe Gracía-Oliva ◽  
Ramón Cuevas-Guzmán ◽  
José Enrique Jardel-Peláez
Keyword(s):  
Woody Debris ◽  
Mineral Soil ◽  
Biosphere Reserve ◽  
Hardwood Forest ◽  
Carbon Pools ◽  
Research Station ◽  
C Storage ◽  
Ecosystem Carbon ◽  
Sierra De Manantlán ◽  
Downed Woody Debris

Aim of the study: To analyze the recovery pattern of carbon pools in terms of size and the relative contribution of each pool to total ecosystem C along a fire chronosequence of tropical mixed pine-hardwood forest.Area of the study: Las Joyas Research Station (LJRS), core zone of Sierra de Manantlán Biosphere Reserve (SMBR) in the state of Jalisco, central western Mexico.Materials and methods: Carbon stored in aboveground plant biomass, standing dead trees, downed woody debris, forest floor, fine roots and mineral soil, was compared with a nested analysis of variance (ANOVA) in post-fire stands of eight-year-old, 28- and 60-year-old stands of mixed Pinus douglasiana-hardwood forest.Main results: The total ecosystem carbon in eight-year-old stands was 50% lower than that of 60-year-old stands. Carbon content in the biomass and mineral soil increased with stand age. The carbon in the biomass recovered to the undisturbed forest in the 28 years of succession. The main C storage in the eight-year-old stands were the mineral soil (64%) and downed woody debris (18%), while in the 28- and 60-year-old stands, live tree biomass and mineral soil were the two largest components of the total C pool (43% and 46%, respectively).Research highlights: We found a significant effect of high-severity fire events on ecosystem C storage and a shift in carbon distribution. The relatively fast recovery of C in ecosystem biomass suggests that mixed Pinus douglasiana hardwood forest possess functional traits that confer resilience to severe fire events.Key words: chronosequence; carbon dynamics; mineral soil; Pinus douglasiana; fire effects.Abbreviations used: LJRS, Las Joyas Research Station; DBH, diameter at breast height; DL, duff layer; LL, litter layer; DWD, downed woody debris; ANOVA, analysis of variance; CO2, carbon dioxide; SMBR, Sierra de Manantlán Biosphere Reserve; C, carbon. AGV, above ground vegetation.

Essais de jardinage sans martelage dans des peuplements irréguliers de sapin baumier et d’épinette noire

2010 ◽  
Vol 86 (4) ◽  
pp. 498-510 ◽  
Author(s):  
Jérôme Cimon-Morin ◽  
Jean-Claude Ruel ◽  
Marcel Darveau ◽  
Jean-Martin Lussier ◽  
Philippe Meek ◽  
...  
Keyword(s):  
Black Spruce ◽  
Woody Debris ◽  
Abies Balsamea ◽  
Basal Area ◽  
Shannon Index ◽  
Simplified Approach ◽  
Selection Cutting ◽  
Quadratic Mean Diameter ◽  
Downed Woody Debris ◽  
Index Tree

It is increasingly accepted that silviculture must now try to maintain complex stands. In this context, selection cutting has been suggested as an option for irregular boreal stands. However, selection cutting in virgin stands could prove difficult to apply at a reasonable cost. In an attempt to reduce harvesting costs, two selection cutting patterns were implemented, avoiding tree marking. The efficacy of this approach was evaluated by comparing the results of plots harvested without tree marking to those with tree marking. To proceed in the absence of tree marking, silvicultural types were defined as well as a rule for the selection of stems to harvest; the final choice of stems to fell was therefore left to the operator upon harvesting. The effects of the different silvicultural and tree marking treatments were examined in relation to their ability to maintain the main structural and functional attributes of irregular boreal stands. A follow-up was conducted with regards to structure, composition, residual stand basal area, abundance of woody debris and mortality. The absence of marking did not affect the performance of selection cutting treatments in terms of basal area, quadratic mean diameter and Shannon index. Tree vigour was not modified by harvesting, both with and without tree marking. Stand composition was not influenced by the absence of marking. Snag abundance was reduced to similar levels regardless of marking. Tree marking did not influence the abundance of downed woody debris. As a consequence, it seems possible to apply a simplified approach of selection cutting, without compromising the success of the treatment in these stands.Key words: black spruce, Picea mariana, balsam fir, Abies balsamea, irregular stand, selection cutting, ecosystem management, forest attributes

Biomass Harvesting Guidelines affect downed woody debris retention

2014 ◽  
Vol 70 ◽  
pp. 382-391 ◽  
Author(s):  
S.R. Fritts ◽  
C.E. Moorman ◽  
D.W. Hazel ◽  
B.D. Jackson
Keyword(s):  
Woody Debris ◽  
Biomass Harvesting ◽  
Downed Woody Debris

Contrasting downed woody debris dynamics in managed and unmanaged northern hardwood stands

2008 ◽  
Vol 38 (11) ◽  
pp. 2850-2861 ◽  
Author(s):  
Mark C. Vanderwel ◽  
Hilary C. Thorpe ◽  
Jennifer L. Shuter ◽  
John P. Caspersen ◽  
Sean C. Thomas
Keyword(s):  
Matrix Model ◽  
Woody Debris ◽  
Fruiting Bodies ◽  
Northern Hardwood ◽  
Decay Class ◽  
Species Type ◽  
Downed Woody Debris ◽  
Cut Surface ◽  
Selection Silviculture

The reported effects of selection silviculture on downed woody debris (DWD) vary. To investigate the processes underlying potential management impacts on DWD stocks and fluxes, we conducted a repeated census of downed wood in selection-harvested, selectively harvested, and unmanaged (old-growth) stands in central Ontario. DWD was significantly more abundant in stands harvested within the last 20 years than in stands harvested earlier, and shifted towards more advanced decay classes over the first 20 years after harvest. These results are consistent with persistence of a harvest-related DWD pulse for up to two decades in managed stands. The transition of DWD from early and middle decay classes to more advanced decay classes proceeded more slowly in managed than unmanaged stands. Species type, identity of fungal fruiting bodies, presence of a cut surface, and plot moisture class were significant predictors of variation in decay dynamics within particular decay classes; however, these factors did not account for observed differences in decay-class transitions between managed and unmanaged stands. A decay class matrix model projected DWD half-lives of 19 years for unmanaged stands and 21 years for managed stands. Over the long term, slower decay dynamics may help somewhat in maintaining relatively high DWD abundances in stands managed under selection silviculture.

Processes Affecting Carbon Storage in the Forest Floor and in Downed Woody Debris

2002 ◽  
pp. 135-157 ◽  
Author(s):  
William S. Currie ◽  
Ruth D. Yanai ◽  
Kathryn B. Piatek ◽  
Cindy E. Prescott ◽  
Christine L. Goodale
Keyword(s):  
Carbon Storage ◽  
Forest Floor ◽  
Woody Debris ◽  
Downed Woody Debris

scholarly journals Estimating combustion of large downed woody debris from residual white ash

2005 ◽  
Vol 14 (3) ◽  
pp. 245 ◽  
Author(s):  
Alistair M. S. Smith ◽  
Andrew T. Hudak
Keyword(s):  
Woody Debris ◽  
Aerial Photographs ◽  
Loss On Ignition ◽  
Tree Biomass ◽  
Complete Combustion ◽  
White Ash ◽  
Savanna Fires ◽  
Typical Satellite ◽  
Downed Woody Debris ◽  
North Western

The production of residual white ash patches within wildfires represents near-complete combustion of the available fuel and releases a considerable quantity of gases to the atmosphere. These patches are generally produced from combustion of large downed woody debris (LDWD) such as fallen trees and snags. However, LDWD are generally ignored in calculations of fuel combusted within environments where surface fires dominate (e.g. southern African savannas). To assess the potential of fractional white ash cover as a remotely sensed measure of LDWD combustion, both the proportion of the surface covered by white ash and the combustion completeness required to produce white ash must be quantified. An aerial photograph of woodland savanna fires in north-western Zimbabwe was analysed to estimate the proportion of white ash cover within a typical satellite sensor pixel. The proportion loss on ignition (LOI) of wood samples from the study area was measured and combined with previous estimates of mean tree biomass. The proportion of white ash within the aerial photographs was 0.2% (± 0.06), which corresponded to an additional 67 320 kg ha−1 of biomass combusted above that typically recorded as combusted from a surface fire in this environment (~7000 kg ha−1). This analysis should be repeated in other savannas and forests, where pre-fire fuel loads and post-fire fractional white ash cover may be higher.

Disturbance history influences downed woody debris and soil respiration

2010 ◽  
Vol 260 (10) ◽  
pp. 1762-1772 ◽  
Author(s):  
Ulrike Hagemann ◽  
Martin T. Moroni ◽  
Johanna Gleißner ◽  
Franz Makeschin
Keyword(s):  
Soil Respiration ◽  
Woody Debris ◽  
Disturbance History ◽  
Downed Woody Debris

Effect of Downed Woody Debris on Small Mammal Anti-Predator Behavior

Ethology ◽  
2011 ◽  
Vol 118 (1) ◽  
pp. 17-23 ◽  
Author(s):  
Travis M. Hinkelman ◽  
John L. Orrock ◽  
Susan C. Loeb
Keyword(s):  
Small Mammal ◽  
Woody Debris ◽  
Downed Woody Debris ◽  
Predator Behavior
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